User and Service Guide Publication number 54615-97019 June 2000 For Safety Information, Warranties, and Regulatory information, see the pages behind the index.
A General-Purpose Oscilloscope The Agilent 54615B, 54616B, and 54616C oscilloscopes offer exceptional waveform viewing and measurements in a small, lightweight package. These dual channel, 500 MHz bandwidth oscilloscopes are designed for use in labs where high speed analog and digital circuits are being tested.
Accessories supplied • • • • Two 1.5 meter, 10:1 Rugged 500 MHz Passive Probes (10073B) Power cord for country of destination This User and Service Guide Programmer’s Guide with Microsoft Windows Help file, ascii help file, and sample programs.
Options available • Option 001 RS-03 Magnetic Interference Shielding Added to CRT (54615B and 54616B only) • Option 002 RE-02 Display Shield Added to CRT (54615B and 54616B only) • • • • • • • • iv Option 005 Enhanced TV/Video Trigger Option 101 Accessory Pouch and Front-Panel Cover Option 103 Operator’s Training Kit (54654A) Option 104 Carrying Case (1185A) Option 106 BenchLink/Scope Software (34810B) Option 090 Deletes Probes Option 1CM Rackmount Kit Power Cords (see the table of Replaceable Parts in
In This Book This is the User and Service Guide for the Agilent 54615B, 54616B, and 54616C Oscilloscopes. This guide contains five chapters. First Time Users Chapter 1 is a quick start guide that gives you a brief overview of the oscilloscope. 1 The Oscilloscope at a Glance 2 Operating your Oscilloscope 3 Using Option 005 Enhanced TV/Video Trigger 4 Service 5 Performance Characteristics Advanced users Chapter 2 is a series of exercises that guide you through the operation of the oscilloscope.
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Contents 1 The Oscilloscope at a Glance To connect a signal to the oscilloscope 1–5 To display a signal automatically 1–7 To set up the vertical window 1–8 To expand the vertical signal 1–10 To set up the time base 1–11 To trigger the oscilloscope 1–13 To use roll mode 1–16 Using Color (54616C only) 1–17 To select the color palettes and observe colors 1–18 To print in color 1–20 2 Operating Your Oscilloscope To use delayed sweep 2–3 To use storage oscilloscope operation 2–6 To capture a single event 2–8
Contents 3 Using Option 005 Enhanced TV/Video Trigger To select TV display grid 3–4 To autoscale on a video signal 3–4 To trigger on a specific line of video 3–5 To trigger on all TV line sync pulses 3–7 To trigger on a specific field of the video signal 3–8 To trigger on all fields of the video signal 3–9 To trigger on odd or even fields 3–10 To make cursor measurements 3–12 To use delayed sweep 3–14 To analyze video waveforms with Option 005 3–16 To window in on harmonic distortion using FFT 3–18 To conn
Contents Troubleshooting the Oscilloscope 4–32 To construct your own dummy load 4–33 To check out the oscilloscope 4–34 To clear error messages 4–37 To check the Low Voltage Power Supply 4–41 To run the internal self-tests 4–42 To troubleshoot Option 005 4–45 Replacing Parts in the Oscilloscope 4–45 To replace an assembly 4–46 To remove the fan 4–47 To remove the front panel 4–47 To remove the display 4–49 To remove the system board 4–49 To remove the attenuator 4–50 To remove and replace an acquisition h
Contents Advanced Functions 5–8 Power Requirements 5–8 General (54615B and 54616B only) 5–9 General (54616C only) 5–11 General (54615B, 54616B, and 54616C) 5–12 Option 005 General Performance Characteristics 5–13 Option 005 Trigger System 5–14 Glossary Index Contents-4
1 Perform self-calibration first For the oscilloscope to perform most accurately in the ambient temperature where it will be used, the self-calibration procedure described on page 4-25 should first be performed. Allow the unit to operate for at least 30 minutes before performing the self-calibration.
The Oscilloscope at a Glance One of the first things you will want to do with your new oscilloscope is to become acquainted with its front panel. Therefore, we have written the exercises in this chapter to familiarize you with the controls you will use most often. The front panel has knobs, grey keys, and white keys. The knobs are used most often and are similar to the knobs on other oscilloscopes.
Figure 1–1 Storage keys General controls Trigger controls External trigger control Channel controls External trigger input Channel inputs Horizontal controls Front Panel Controls Delayed sweep is on, 200 ns/div Main sweep 500 µs/div Figure 1–2 Sample rate display (Main/Delayed) Channel 2 is on, 4 V/div Channel 1 is on, ac coupled, inverted, 100 mV/div Autostore is on Auto triggered, positive slope, trigger source is channel 1 Peak detect is on Display Status Line Indicators 1–3
Figure 1–3 Press this key To obtain this menu Softkey Menu Reference 1–4 Press this key To obtain this menu
The Oscilloscope at a Glance To connect a signal to the oscilloscope To connect a signal to the oscilloscope The 54615B is a two-channel, 500 MHz bandwidth, 1 GSa/s sample rate oscilloscope with an external trigger input. The 54616Band 54616C are two-channel, 500 MHz bandwidth, 2 GSa/s sample rate oscilloscopes with an external trigger input. The input impedance of these oscilloscopes is selectable – either 50Ω or 1 MΩ. The 50Ω mode matches 50Ω cables commonly used in making high frequency measurements.
The Oscilloscope at a Glance To connect a signal to the oscilloscope • To set the input impedance, press 1 . Select the desired Input impedance of 50Ω or 1MΩ. • To set the probe attenuation factor press 1 . Select the Next Menu softkey. Next toggle the Probe softkey to change the attenuation factor to match the probe you are using. You should compensate 10:1 probes to match their characteristics to the oscilloscope. A poorly compensated probe can introduce measurement errors.
The Oscilloscope at a Glance To display a signal automatically To display a signal automatically The oscilloscope has an Autoscale feature that automatically sets up the oscilloscope to best display the input signal. Using Autoscale requires signals with a frequency greater than or equal to 50 Hz and a duty cycle greater than 0.5%. When you press Autoscale , the oscilloscope turns on and scales all channels that have signals applied, and selects a time base range based on the trigger source.
The Oscilloscope at a Glance To set up the vertical window To set up the vertical window The following exercise guides you through the vertical keys, knobs, and status line. 1 Center the signal on the display with the Position knob. The Position knob moves the signal vertically, and it is calibrated. Notice that as you turn the Position knob, a voltage value is displayed for a short time indicating how far the ground reference is located from the center of the screen.
The Oscilloscope at a Glance To set up the vertical window 2 Change the vertical setup and notice that each change affects the status line differently. You can quickly determine the vertical setup from the status line in the display. • Change the vertical sensitivity with the Volts/Div knob and notice that it causes the status line to change. • Press 1 . A softkey menu appears on the display, and the channel turns on (or remains on if it was already turned on).
The Oscilloscope at a Glance To expand the vertical signal To expand the vertical signal When changing the Volts/Div for analog channels, you can have the signal expand (or compress) about the center screen or about the ground point. • To expand the signal about center screen, press Print/Utility Then select System Config and Expand Vertical Center. • To expand the signal about ground, press Print/Utility . Then select System Config and Expand Vertical Ground. 1–10 .
The Oscilloscope at a Glance To set up the time base To set up the time base The following exercise guides you through the time base keys, knobs, and status line. 1 Turn the Time/Div knob and notice the change it makes to the status line. The Time/Div knob changes the sweep speed from 1 ns to 5 s in a 1-2-5 step sequence, and the value is displayed in the status line. The sample rate is also displayed on the status line.
The Oscilloscope at a Glance To set up the time base • Turn the Delay knob and notice that its value is displayed in the status line. The Delay knob moves the main sweep horizontally, and it pauses at 0.00 s, mimicking a mechanical detent. At the top of the graticule is a solid triangle ( ▼ ) symbol and an open triangle ( ∇ ) symbol. The ▼ symbol indicates the trigger point and it moves in conjunction with the Delay knob. The ∇ symbol indicates the time reference point.
The Oscilloscope at a Glance To trigger the oscilloscope To trigger the oscilloscope The following exercise guides you through the trigger keys, knobs, and status line. 1 Turn the trigger Level knob and notice the changes it makes to the display. As you turn the Level knob or press a trigger menu key, for a short time two things happen on the display. First, the trigger level is displayed in inverse video. If the trigger is dc coupled, it is displayed as a voltage.
The Oscilloscope at a Glance To trigger the oscilloscope • Press Mode . A softkey menu appears on the display with five trigger mode choices. • Toggle the Single and TV softkeys and notice that they affect the status line differently. (You can only select TV if the trigger source is either channel 1 or 2.) When the oscilloscope is triggering properly, the trigger mode portion of the status line is blank.
The Oscilloscope at a Glance To trigger the oscilloscope • Press Slope/Coupling . A softkey menu appears on the display. If you selected Auto level, Auto, Normal, or Single as a trigger mode, six softkey choices are displayed. If you selected TV as a trigger source, five other softkey choices are available. • Toggle each of the softkeys and notice which keys affect the status line. • External trigger input coupling (ac or dc) is selected from the External Trigger menu.
The Oscilloscope at a Glance To use roll mode To use roll mode Roll mode continuously moves data across the display from right to left. Roll mode allows you to see dynamic changes on low frequency signals, such as when you adjust a potentiometer. Two frequently used applications of roll mode are transducer monitoring and power supply testing. 1 Press Mode . Then press the Auto Lvl , Auto, or Normal softkey. 2 Press Main/Delayed . 3 Press the Roll softkey.
Using Color (54616C only) With the 54616C color oscilloscope, you can select any of the seven available color palettes to assign colors to channels, cursors, stored waveforms, and text. The seven color palettes allow additional customization, which allows you to easily distinguish between channel waveforms. In addition, when making measurements on a channel, wherever the channel number appears on screen, it is highlighted in the selected color.
The Oscilloscope at a Glance To select the color palettes and observe colors To select the color palettes and observe colors 1 Press Display . The name of the selected palette appears under the Palette softkey. 2 Press the Palette softkey. Continue to cycle through the palettes and observe colors applied to the cursors, waveforms, and softkeys. Notice that the softkeys are white in all palettes, except the Inverse palettes, where they are black. 3 Press the Grid softkey until Full is displayed.
The Oscilloscope at a Glance To select the color palettes and observe colors The following table shows the color palettes and the palette colors mapped to the display components.
The Oscilloscope at a Glance To print in color To print in color 1 Press Print/Utility . The 54616C can print to an HP DeskJet Color printer when using an Interface Module with either an RS-232 interface or parallel interface (there are no color printers with an GPIB interface.) 2 Press the Hardcopy Menu softkey. Then press Format until HP DJColor is displayed. This selects the HP DeskJet Color Printer format.
2 Operating Your Oscilloscope
Operating Your Oscilloscope By now you are familiar with the VERTICAL, HORIZONTAL, and TRIGGER groups of the front-panel keys. You should also know how to determine the setup of the oscilloscope by looking at the status line. If you are unfamiliar with this information, we recommend you read chapter 1, "The Oscilloscope at a Glance." This chapter takes you through two new groups of front-panel keys: STORAGE, and the group of keys that contains the Measure, Save/Recall, and Display keys.
Operating Your Oscilloscope To use delayed sweep To use delayed sweep Delayed sweep is a magnified portion of the main sweep. You can use delayed sweep to locate and horizontally expand part of the main sweep for a more detailed (high resolution) analysis of signals. The following steps show you how to use delayed sweep. Notice that the steps are very similar to operating the delayed sweep in analog oscilloscopes. 1 Connect a signal to the oscilloscope and obtain a stable display. 2 Press Main/Delayed .
Operating Your Oscilloscope To use delayed sweep Since both the main and delayed sweeps are displayed, there are half as many vertical divisions so the vertical scaling is doubled. Notice the changes in the status line. • To display the delay time of the delayed sweep, either press Main/Delayed or turn the delay knob. The delay value is displayed near the bottom of the display. 4 Set the time reference (Time Ref) to either left (Lft) or center (Cntr). Figure 2-1 shows the time reference set to left.
Operating Your Oscilloscope To use delayed sweep Figure 2-2 shows the time reference set to center. Notice that the markers expand around the area of interest. You can place the markers over the area of interest with the delay knob, then expand the delayed sweep with the time base knob to increase the resolution.
Operating Your Oscilloscope To use storage oscilloscope operation To use storage oscilloscope operation There are four front-panel storage keys. They are white instant action keys that change the operating mode of the oscilloscope. The following steps demonstrate how to use these storage keys. 1 Connect a signal to the oscilloscope and obtain a stable display. 2 Press Autostore . Notice that STORE replaces RUN in the status line.
Operating Your Oscilloscope To use storage oscilloscope operation 3 Using the position knob in the Vertical section of the front panel, move the trace up and down about one division. Notice that the last acquired waveform is in full bright and the previously acquired waveforms are displayed in half bright. • To characterize the waveforms, use the cursors. See "To make cursor measurements" on page 2-23. • To clear the display, press Erase . • To exit the Autostore mode, press either Run or Autostore .
Operating Your Oscilloscope To capture a single event To capture a single event To capture a single event, you need some knowledge of the signal in order to set up the trigger level and slope. For example, if the event is derived from TTL logic, a trigger level of 2 volts should work on a rising edge. The following steps show you how to use the oscilloscope to capture a single event. 1 Connect a signal to the oscilloscope. 2 Set up the trigger. • Press • Press Source .
Operating Your Oscilloscope To capture a single event 6 If you need to compare several single-shot events, press Autostore . Like the Run key, the Autostore key also arms the trigger circuit. When the trigger conditions are met, the oscilloscope triggers. Pressing the Autostore key again rearms the trigger circuit without erasing the display. All the data points are retained on the display in half bright with each trigger allowing you to easily compare a series of single-shot events.
Operating Your Oscilloscope To capture glitches or narrow pulses To capture glitches or narrow pulses A glitch is a rapid change in the waveform that is usually narrow as compared to the waveform. This oscilloscope has two modes of operation that you can use for glitch capture: peak detect and Autostore. 1 Connect a signal to the oscilloscope and obtain a stable display. 2 Find the glitch. Use peak detect for narrow pulses or glitches. • To select peak detect, press Display .
Operating Your Oscilloscope To capture glitches or narrow pulses Autostore operating hints Use Autostore for the following cases: • Waveforms that are changing. • Waveforms that you want to view and compare with stored waveforms. • Narrow pulses or glitches that occur infrequently. • Press Autostore . You can use peak detect and Autostore together. Peak detect captures the glitch, while Autostore retains the glitch on the display in half bright video. 3 Characterize the glitch with delayed sweep.
Operating Your Oscilloscope To trigger on a complex waveform To trigger on a complex waveform The difficulty in viewing a complex waveform is triggering on the signal. Figure 2-3 shows a complex waveform that is not synchronized with the trigger. The simplest trigger method is to trigger the oscilloscope on a sync pulse that is associated with the waveform. See "To trigger the oscilloscope" on page 1-13. If there is no sync pulse, use the following procedure to trigger on a periodic complex waveform.
Operating Your Oscilloscope To trigger on a complex waveform Figure 2-3 Stable trigger, but the waveform is not synchronized with the trigger Figure 2-4 Holdoff synchronizes the waveform with the trigger In Figure 2-4, the holdoff is set to about 25 µs (the duration of the pattern.
Operating Your Oscilloscope To make frequency measurements automatically To make frequency measurements automatically The automatic measurement capability of the oscilloscope makes frequency measurements easy, as the following steps demonstrate. 1 Connect a signal to the oscilloscope and obtain a stable display. 2 Press Time . A softkey menu appears with six softkey choices. 3 Toggle the Source softkey to select a channel for the frequency measurement. 4 Press the Freq softkey.
Operating Your Oscilloscope To make frequency measurements automatically If the Show Meas softkey is turned on, cursors are displayed on the waveform that show the measurement points for the right-most measurement result. If you select more than one measurement, you can show a previous measurement by reselecting the measurement. • To find the Show Meas softkey, press the Next Menu softkey. The oscilloscope makes automatic measurements on the first displayed event.
Operating Your Oscilloscope To make time measurements automatically To make time measurements automatically You can measure the following time parameters with the oscilloscope: frequency, period, duty cycle, width, rise time, and fall time. The following exercise guides you through the Time keys by making a rise time measurement. Figure 2-6 shows a pulse with some of the time measurement points. 1 Connect a signal to the oscilloscope and obtain a stable display.
Operating Your Oscilloscope To make time measurements automatically 2 Press Time . A softkey menu appears with six softkey choices. Three of the softkeys are time measurement functions. Source Selects a channel for the time measurement. Time Measurements Three time measurement choices are available: Freq (frequency), Period, and Duty Cy (duty cycle). These measurements are made at the 50% levels. Refer to figure 2-6.
Operating Your Oscilloscope To make time measurements automatically Time Measurements Four additional time measurement choices are available; +Width, -Width, Rise Time, and Fall Time. Width measurements are made at the 50% levels, whereas rise time and fall time measurements are made at the 10% to 90% levels. Previous Menu Returns to the previous softkey menu. 4 Press the Rise Time softkey. The oscilloscope automatically measures the rise time of the signal and displays the result on the display.
Operating Your Oscilloscope To make voltage measurements automatically To make voltage measurements automatically You can measure the following voltage parameters automatically with the oscilloscope: peak-to-peak, average, rms, maximum, minimum, top, and base. The following exercise guides you through the Voltage keys by making an rms voltage measurement. Figures 2-8 and 2-9 show pulses with some of the voltage measurement points.
Operating Your Oscilloscope To make voltage measurements automatically 1 Connect a signal to the oscilloscope and obtain a stable display. 2 Press Voltage . A softkey menu appears with six softkey choices. Three of the softkeys are voltage measurement functions. Source Selects a channel for the voltage measurement. Voltage Measurements Three voltage measurement choices are available: Vp-p, Vavg, and Vrms The measurements are determined by voltage histograms of the signal.
Operating Your Oscilloscope To make voltage measurements automatically 3 Press the Vrms softkey. The oscilloscope automatically measures the rms voltage and displays the result on the display. The oscilloscope makes automatic measurements on the first pulse or period in the display. If a cycle of the waveform cannot be found as shown in the delayed window in figure 2-10, the measurement is made using the delayed window as the cycle.
Operating Your Oscilloscope To make voltage measurements automatically 4 Press the Next Menu softkey. Another voltage measurement softkey menu appears with six additional choices. Four of the softkeys are voltage measurement functions. Show Meas (show measurement) Displays the horizontal and vertical cursors that show where the measurement was taken on the signal. Voltage Measurements Four additional voltage measurement choices are available: Vmax, Vmin, Vtop, Vbase.
Operating Your Oscilloscope To make cursor measurements To make cursor measurements The following steps guide you through the front-panel Cursors key. You can use the cursors to make custom voltage or time measurements on the signal. Examples of custom measurements include rise time measurements from reference levels other than 10-90%, frequency and width measurements from levels other than 50%, channel-to-channel delay measurements, and voltage measurements.
Operating Your Oscilloscope To make cursor measurements Figure 2-11 Cursors used to measure pulse width at levels other then the 50% points Figure 2-12 Cursors used to measure the frequency of the ringing on a pulse 2–24
Operating Your Oscilloscope To make cursor measurements Figure 2-13 Cursors used to make channel-to-channel delay measurements Figure 2-14 The cursors track delayed sweep. Expand the display with delayed sweep, then characterize the event of interest with the cursors.
Operating Your Oscilloscope To make cursor measurements Figure 2-15 Pressing t1 and t2 softkeys simultaneously causes the time cursors to move together when the cursor knob is adjusted. Figure 2-16 By moving the time cursors together, you can check for pulse width variations in a pulse train, as figures 2-15 and 2-16 show.
Operating Your Oscilloscope To remove cabling errors from time interval measurements To remove cabling errors from time interval measurements When measuring time intervals in the nanosecond range, small differences in cable length can totally obscure the measurement. The following exercise shows how to remove errors that different cable lengths or characteristics introduce to your measurement. The Skew control makes it possible to remove this offset error from your measurement.
Operating Your Oscilloscope To view asynchronous noise on a signal To view asynchronous noise on a signal The following exercise shows how to use the oscilloscope to view asynchronous noise on a signal that is not synchronous to the period of the waveform. 1 Connect a noisy signal to the oscilloscope and obtain a stable display. Figure 2-17 shows a waveform with asynchronous noise at the top of the pulse.
Operating Your Oscilloscope To view asynchronous noise on a signal 2 Press Autostore . Notice that STORE is displayed in the status line. 3 Set the Trigger Mode to Normal, then adjust the trigger level into the noise region of the signal. 4 Decrease the sweep speed for better resolution of the asynchronous noise. • To characterize the asynchronous noise signal, use the cursors. Figure 2-18 This is a triggered view of the asynchronous noise shown in figure 2-17.
Operating Your Oscilloscope To reduce the random noise on a signal To reduce the random noise on a signal If the signal you are applying to the oscilloscope is noisy (figure 2-21), you can set up the oscilloscope to reduce the noise on the waveform (figure 2-22). First, you stabilize the displayed waveform by removing the noise from the trigger path. Second, you reduce the noise on the displayed waveform. 1 Connect a noisy signal to the oscilloscope and press Autoscale .
Operating Your Oscilloscope To reduce the random noise on a signal Low frequency reject (LF Reject) adds a high pass filter with the 3-dB point at 50 kHz (see figure 2-20). Use LF reject to remove low frequency signals such as power line noise from the trigger path. Figure 2-20 0 dB 3 dB down point Pass Band dc 50 kHz LF reject (trigger path) Noise reject increases the trigger hysteresis band. By increasing the trigger hysteresis band you reduce the possibility of triggering on noise.
Operating Your Oscilloscope To reduce the random noise on a signal 3 Use averaging to reduce noise on the displayed waveform. To use averaging follow these steps. • Press Display , the press the Average softkey. Notice that Av appears in the status line. • Toggle the # Average softkey to select the number of averages that best eliminates the noise from the displayed waveform.
Operating Your Oscilloscope To save or recall traces To save or recall traces The oscilloscope has two pixel memories for storing waveforms. The following exercise guides you through how to store and recall waveforms from pixel memories. 1 Connect a signal to the oscilloscope and obtain a stable display. 2 Press Trace . A softkey menu appears with five softkey selections. Four of the softkeys are trace memory functions. Trace Selects memory 1 or memory 2. Trace Mem Turns on or off the selected memory.
Operating Your Oscilloscope To save or recall front-panel setups The automatic measurement functions do not operate on stored traces. Remember, the stored waveforms are pictorial information rather than stored data. • If you have not changed the oscilloscope setup, use the cursors to make the measurements. • If you have changed the oscilloscope setup, press the Recall Setup softkey. Then,use the cursors to make the measurements.
Operating Your Oscilloscope To reset the instrument setup To reset the instrument setup 1 To reset the instrument to the default factory-preset configuration, press Setup . 2 Press the Default Setup softkey. 3 To reset the instrument to the configuration that was present before pressing Autoscale, press the Undo Autoscale softkey. Table 2-1 Default Setup configuration settings Configuration Item Cursors Trace memories Setting Cursors off; time readout is selected; all cursors are set to time/voltage zero.
Operating Your Oscilloscope To use the XY display mode To use the XY display mode The XY display mode converts the oscilloscope from a volts versus time display to a volts versus volts display. You can use various transducers so the display could show strain versus displacement, flow versus pressure, volts versus current, or voltage versus frequency. This exercise shows a common use of the XY display mode by measuring the phase shift between two signals of the same frequency with the Lissajous method.
Operating Your Oscilloscope To use the XY display mode XY display mode operating hint Before entering xy display mode, center both channels on screen in the main sweep and adjust sweep speed to obtain greater than or equal to 1 cycle of the lowest frequency input signal on screen. When you select the XY display mode, the time base is turned off. Channel 1 is the X-axis input, channel 2 is the Y-axis input. 4 Press Cursors .
Operating Your Oscilloscope To use the XY display mode 6 Move the Y1 and Y2 cursors to the center of the signal. Again, note the ∆Y value. Figure 2-25 7 Calculate the phase difference using formula below. sin θ = second ∆Y 143.8 = 300.0 first ∆Y θ = 28.
Operating Your Oscilloscope To use the XY display mode Figure 2-26 Signals are 90° out of phase Figure 2-27 Signals are in phase 2–39
Operating Your Oscilloscope To analyze video waveforms To analyze video waveforms Enhanced TV/Video Trigger This section discusses basic TV video triggering. If you have Option 005 Enhanced TV/Video Trigger installed in your oscilloscope, refer to Chapter 3 "Using Option 005 Enhanced TV/Video Trigger." The TV sync separator in the oscilloscope has an internal clamp circuit. This removes the need for external clamping when you are viewing unclamped video signals.
Operating Your Oscilloscope To analyze video waveforms 5 Set the time base to 200 µs/div, then center the signal on the display with the delay knob (delay about 800 µs). 6 Press Main/Delayed , then press the Delayed softkey. 7 Set the delayed sweep to 20 µs/div, then set the expanded portion over the VITS (delay about 920 µs, dependent on broadcast channel).
Operating Your Oscilloscope To analyze video waveforms Delay in TV line units hint The oscilloscope has the ability to display delay in TV-line units. Using the TV field trigger mode activates this line-counting feature. When Field 1 or Field 2 is selected as the trigger source, delay can be set in terms of time or line number. Both-fields triggering in the oscilloscope hint The oscilloscope can trigger on the vertical sync pulse in both TV fields at the same time.
3 Using Option 005 Enhanced TV/Video Trigger
Using Option 005 Enhanced TV/Video Trigger Basic TV/video triggering This section discusses Enhanced TV/Video triggering. If you do not have Option 005 installed in your oscilloscope, refer to the last section in Chapter 2 "To analyze video waveforms" for basic TV triggering procedures. You can use the Option 005 Enhanced TV/Video trigger with your oscilloscope.
Using Option 005 Enhanced TV/Video Trigger Option 005 gives you an Enhanced TV/Video Trigger for the oscilloscope, allowing highly detailed analysis of TV waveforms.
Using Option 005 Enhanced TV/Video Trigger To select TV display grid To select TV display grid • Press Display , then press the Grid softkey until TV is selected. To autoscale on a video signal 1 Use a cable to connect a TV signal to channel 1. 2 Press Mode in the TRIGGER section of the front panel, and select the Trigger Mode TV softkey. 3 To select a TV standard, press Slope/Coupling in the TRIGGER section of the front panel, then press the Standard softkey to select the TV standard.
Using Option 005 Enhanced TV/Video Trigger To trigger on a specific line of video To trigger on a specific line of video TV triggering requires greater than 1/4 division of sync amplitude, either channel 1 or channel 2 as the trigger source. Turning the trigger level knob in TV trigger does not change the trigger level because the trigger level is automatically set to the sync pulse tips.
Using Option 005 Enhanced TV/Video Trigger To trigger on a specific line of video Figure 3-1 Triggering on Line 71 Table 3-1 Line Numbers per Field for Each TV Standard TV Standard NTSC PAL SECAM GENERIC Field 1 1 to 263 1 to 313 1 to 313 1 to 1024 Field 2 1 to 262 314 to 625 314 to 625 1 to 1024 Alt Fld 1 to 262 1 to 313 1 to 313 1 to 1024 (Vertical) Line Number Represents Count In GENERIC mode, the line number represents the number of a count instead of a real line number.
Using Option 005 Enhanced TV/Video Trigger To trigger on all TV line sync pulses To trigger on all TV line sync pulses To quickly find maximum video levels, you could trigger on all TV line sync pulses. When All Lines is selected as the TV trigger mode, the oscilloscope will trigger on the first line that it finds when the acquisition starts. 1 Select the TV display, TV as the trigger mode, and the appropriate TV standard as described in the previous section, "To autoscale on a video signal.
Using Option 005 Enhanced TV/Video Trigger To trigger on a specific field of the video signal To trigger on a specific field of the video signal To examine the components of a video signal, trigger on either Field 1 or Field 2. When a specific field is selected, the oscilloscope triggers on the rising edge of the first serration pulse in the vertical sync interval in the specified field (1 or 2).
Using Option 005 Enhanced TV/Video Trigger To trigger on all fields of the video signal To trigger on all fields of the video signal To quickly and easily view transitions between fields, or to find the amplitude differences between the fields, use the All Fields trigger. The oscilloscope will trigger on the first field it finds at the start of acquisition. 1 Select the TV display, TV as the trigger mode, and the appropriate TV standard as described in the section, "To autoscale on a video signal.
Using Option 005 Enhanced TV/Video Trigger To trigger on odd or even fields To trigger on odd or even fields To check the envelope of your video signals, or to measure worst case distortion, trigger on the odd or even fields. When Field 1 is selected, the oscilloscope triggers on color fields 1 or 3. When Field 2 is selected, the oscilloscope triggers on color fields 2 or 4.
Using Option 005 Enhanced TV/Video Trigger To trigger on odd or even fields If a more detailed analysis is required, then only one color field should be selected to be the trigger. You can do this by using the oscilloscope’s holdoff control. Using the holdoff settings shown in the following table, the oscilloscope will now trigger on color field 1 OR color field 3 when Field 1 is selected. This is known as odd field selection. Even fields will be selected with Field 2.
Using Option 005 Enhanced TV/Video Trigger To make cursor measurements To make cursor measurements The following steps guide you through the front-panel Cursors key. You can use the cursors to make custom voltage or time measurements on the signal. Examples of custom measurements include rise time measurements from reference levels other than 10-90%, frequency and width measurements from levels other than 50%, channel-to-channel delay measurements, and voltage measurements.
Using Option 005 Enhanced TV/Video Trigger To make cursor measurements Figure 3-7 Color Sync measured with the cursors as 40 IRE 3–13
Using Option 005 Enhanced TV/Video Trigger To use delayed sweep To use delayed sweep Delayed sweep is a magnified portion of the main sweep. You can use delayed sweep to locate and horizontally expand part of the main sweep for a more detailed (high resolution) analysis of signals, for example multi-burst frequencies. The following steps show you how to use delayed sweep. Notice that the steps are very similar to operating the delayed sweep in analog oscilloscopes.
Using Option 005 Enhanced TV/Video Trigger To use delayed sweep Figure 3-8 Modulated staircase or 5-step, measuring sync pulse fall time with delayed sweep Figure 3-9 Windowed frequency measurement in a multi-burst by use of delayed sweep 3–15
Using Option 005 Enhanced TV/Video Trigger To analyze video waveforms with Option 005 To analyze video waveforms with Option 005 The combination of the TV trigger, delayed sweep, and automatic measurements allow this oscilloscope to precisely analyze video waveforms. There is no need for external clamping to obtain a stable trigger when you are viewing unclamped video signals. This is because the TV sync separator in the oscilloscope has an internal clamp circuit in the trigger path.
Using Option 005 Enhanced TV/Video Trigger To analyze video waveforms with Option 005 5 Set the time base to 200 µs/div, then center the signal on the display with the delay knob (delay about 800 µs). 6 Press Main/Delayed , then press the Delayed softkey. 7 Set the delayed sweep to 20 µs/div, then set the expanded portion over the VITS (delay about 988.8 µs). Figure 3-10 This figure shows the second vertical interval test signals displayed with delayed sweep.
Using Option 005 Enhanced TV/Video Trigger To window in on harmonic distortion using FFT To window in on harmonic distortion using FFT Sine waves that are not perfectly shaped in the time domain generate harmonics in the frequency domain. Viewing this distortion in the time domain is usually very difficult, unless the waveform is severely distorted. However, in the frequency domain, these harmonics are very apparent.
Using Option 005 Enhanced TV/Video Trigger To window in on harmonic distortion using FFT The FFT function then shows the harmonic content of the subcarrier in the figure below. Had the time/division and delays controls not been used to zoom in on the desired subcarrier, the entire video signal (with many frequency components) would have appeared in the frequency domain display. These frequency components would have obscured the color subcarrier and its harmonics.
Using Option 005 Enhanced TV/Video Trigger To connect to other instruments To connect to other instruments The rear panel outputs provide an easy way to connect your Option 005-equipped oscilloscope to other instruments such as spectrum analyzers or frequency counters. To use a frequency counter: 1 Connect the vertical output of the oscilloscope to the counter’s input. 2 Connect the frequency to be measured to channel 1. 3 Press Autoscale , then select the trigger source to be channel 1.
4 Verifying Oscilloscope Performance 4–5 Adjusting the Oscilloscope 4–21 Troubleshooting the Oscilloscope 4–32 Replacing Parts in the Oscilloscope 4–45 Service
Service If the oscilloscope is under warranty, you must return it to Agilent Technologies for all service work covered by the warranty. See "To return the oscilloscope to Agilent Technologies" on page 4-4. If the warranty period has expired, you can still return the oscilloscope to Agilent Technologies for all service work. Contact your nearest Agilent Technologies Sales Office for additional details on service work.
Service Table 4-1 Recommended list of test equipment to service the oscilloscope Equipment Critical specifications Recommended Model/Part Use1 Signal generator 1 to 500 MHz at 200 mV high stability timebase 0.1 mV resolution, better than 0.01% accuracy 100 MHz, 1 MΩ input R 1 to 500 MHz ±3% accuracy Agilent 8656B Option 001 P Agilent 34401A P, A, T Agilent 54600 Agilent 436A and Agilent 8482A P, T P 14 mV to 35 Vdc, 0.1 mV resolution Rise time ≤ 700 ps Outputs differ < 0.
Service To return the oscilloscope to Agilent Technologies To return the oscilloscope to Agilent Technologies Before shipping the oscilloscope to Agilent Technologies, contact your nearest Agilent Technologies Sales Office for additional details. 1 Write the following information on a tag and attach it to the oscilloscope. • • • • Name and address of owner Model number Serial number Description of service required or failure indications 2 Remove all accessories from the oscilloscope.
Verifying Oscilloscope Performance This section shows you how to verify the electrical performance of the oscilloscope, using the performance characteristics in chapter 5 as the standard. The characteristics checked are calibrator, voltage measurement accuracy, bandwidth, horizontal accuracy, and trigger sensitivity. You should verify the performance of the oscilloscope when you first receive it, and every 12 months or after 2,000 hours of operation.
Service Verifying Oscilloscope Performance To check the output of the CALIBRATOR In this test you measure the output of the rear-panel CALIBRATOR output with a multimeter and an oscilloscope. The CALIBRATOR is used for self-calibration of the 54615B, 54616B, and 54616C. The accuracy of the CALIBRATOR is not specified, but it must be within the test limits to provide for accurate self-calibration.
Service Verifying Oscilloscope Performance 4 Press any key once to advance the test. The multimeter should read 5.000 V ± 10 mV. If the result is not within the test limits, see "Troubleshooting the oscilloscope," on page 4-32. 5 Connect an oscilloscope to the rear-panel CALIBRATOR connector. 6 Press any key once to advance the test. 7 Obtain a stable display on the oscilloscope. 8 Measure Vp--p, Vavg, and the frequency of the signal.
Service Verifying Oscilloscope Performance To verify voltage measurement accuracy In this test you verify the voltage measurement accuracy by measuring the output of a power supply using dual cursors on the oscilloscope, and comparing the results with a multimeter. Test limits: ±2.4% of full scale* * Full scale is defined as 56 mV on the 5 mV/div and 2 mV/div ranges. Full scale on all other ranges is defined as 8 divisions times the V/div setting.
Service Verifying Oscilloscope Performance 4 Connect the power supply to the oscilloscope and to the multimeter, using the BNC tee and cables. 5 Adjust the power supply output so that the multimeter reading displays the first Power supply setting value in table 4-4. Wait a few seconds for the measurment to settle. 6 Press the V2 softkey, then position the V2 cursor to the baseline. The ∆V value on the lower line of the display should be within the test limits of table 4-4.
Service Verifying Oscilloscope Performance To verify bandwidth In this test you verify bandwidth by using a power meter and power sensor to set output of a signal generator at 1 MHz and at 500 MHz. You use the peak-to-peak voltage at 1 MHz and at 500 MHz to verify the bandwidth response of the oscilloscope. Test limits: all channels (±3 dB)1 dc to 500 MHz ac coupled 10 Hz to 500 MHz. 1 Table 4-5 Upper bandwidth reduced 2MHz per degree C above 35 °C.
Service Verifying Oscilloscope Performance 1 Connect the equipment. a Connect the signal generator to the input of the power splitter. b Connect the power sensor to one output of the power splitter, and connect channel 1 of the oscilloscope to the other power splitter output. Set the oscilloscope input impedance to 50Ω. 2 Set up the oscilloscope. a Press Setup , then press the Default Setup softkey. b Set the time base to 500 ns/div. c Press 1 to select channel 1, then select 50Ω input and 20 mV/div.
Service Verifying Oscilloscope Performance 8 Change the time base to 5 ns/div. Wait a few seconds for the measurement to settle (the Av letters in the status line indicate how much of the averaging process is finished by turning to inverse video as the oscilloscope performs averaging), then note the Vp-p reading from the bottom of the display. Vp-p = ______ mV. 9 Calculate the response using the following formula.
Service Verifying Oscilloscope Performance To verify horizontal ∆t and 1/∆t accuracy In this test you verify the horizontal ∆t and 1/∆t accuracy by measuring the output of a time mark generator with the oscilloscope. Test limits: ±0.005% ±0.
Service Verifying Oscilloscope Performance 5 Press Time , then press the Freq and Period softkeys. You should measure the following: Frequency 1 MHz, test limits are 995.8 kHz to 1.0042 MHz. Period 1 µs, test limits are 995.9 ns to 1.004 µs. If the measurements are not within the test limits, see "Troubleshooting the Oscilloscope," on page 4-32. 6 Change the time mark generator to 20 ns, and change the time base to 5 ns/div. Adjust the trigger level to obtain a stable display.
Service Verifying Oscilloscope Performance To verify trigger sensitivity In this test you verify the trigger sensitivity by applying 100 MHz to the oscilloscope. The amplitude of the signal is decreased to the specified levels, then you check to see if the oscilloscope is still triggered. You then repeat the process at the upper bandwidth limit. Test limits: Table 4-7 Internal trigger dc to 100 MHz: 100 MHz to 500 MHz: 0.5 div or 5.
Service Verifying Oscilloscope Performance Internal Trig Sensitivity 1 Press Setup , then press the Default Setup softkey. 2 Connect the signal generator to channel 1. 3 Verify the trigger sensitivity at 100 MHz and 0.5 divisions. a Set the signal generator to 100 MHz and about 50 mV. b Press Autoscale . c Press 1 , then toggle Input softkey to 50W. d Decrease the output of the signal generator until there is 0.5 vertical divisions of the signal displayed. The trigger should be stable.
Service Verifying Oscilloscope Performance External Trig Sensitivity 6 Verify the external trigger sensitivity at 500 MHz, 150 mV p-p and at 100 MHz, 75 mV p-p. a Press c Press b c Press Source , then press the Ext softkey. External Trigger , then toggle Input softkey to 50 . 1 then toggle Input softkey to 50 . W W d Using the power splitter, connect one power splitter to output to the e f g h i j k l m n channel 1 input and the other power splitter output to the power sensor.
Service Verifying Oscilloscope Performance To verify Vertical Output on Option 005 This section applies only to Option 005 Enhanced TV/Video Trigger In this test we will use the oscilloscope’s channel 2 to measure the amplitude of the Vertical Output (VERT OUT connector on rear panel) signal. Test limits: Table 4-8 ~90 mVp-p into 50Ω with a full screen input.
54615B/54616B/54616C Performance Test Record Serial No. ______________________________________ Test Interval ____________________________________ Recommended Next Testing _______________________ Calibrator Output Nominal Test Limits dc delay 0 µV 5V 900 mVp-p –450 mVavg 2.46 KHz 2.08 KHz 54615B/16B 54616C Voltage measurement accuracy Range Power Supply Setting 5 V/Div 2 V/Div 1 V/Div 500 mV/Div 200 mV/Div 100 mV/Div 50 mV/Div 20 mV/Div 10 mV/Div 5 mV/Div 2 mV/Div Bandwidth 35 V 14 V 7V 3.5 V 1.
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Adjusting the Oscilloscope This section explains how to adjust the oscilloscope so that it is at optimum operating performance. You should perform the hardware adjustments and Self Cal periodically as indicated below.
Service Adjusting the Oscilloscope To adjust the power supply The power supply has a +5.1 V adjustment and a –5.25 V adjustment. The other voltages are based on the +5.1 V adjustment. In this procedure you use a multimeter to measure the +5.1 V and –5.25 V, and if necessary, adjust the supplies to within tolerance. Table 4-9 Equipment Required Equipment Digital multimeter Critical specifications 0.1 mV resolution, accuracy ±0.
Service Adjusting the Oscilloscope 2 Measure the power supply voltages at E10 through E15 on the system board. The test points are not marked on the system board; see figure below for location of test points. Make sure that the voltage measurements are within the following tolerances. Power Supply Voltage Tolerances Supply Voltage +5.1 V –5.25 V +15.75 V − 15.75 V Tolerance ±153 mV (+4.947 V to +5.253 V) ±158 mV (–5.092 V to –5.408 V) +1.260 V, –787 mV (+14.963 V to +17.010 V) ±787 mV (−14.963 V to −16.
Service Adjusting the Oscilloscope If the +5.1 V measurement is out of tolerance, adjust the +5.1 V adjustment on the power supply; if the –5.25 V measurement is out of tolerance, adjust the –5.25 V adjustment on the power supply (see figure below). The ±15.75 V supplies are not adjustable and are dependent upon the +5.1 V supply. If adjusting the power supply does not bring all the voltages within tolerance, see "Troubleshooting the Oscilloscope," on page 4-32 in this chapter. Figure 4-2 +5.
Service Adjusting the Oscilloscope To perform the self-calibration In this procedure you load the default calibration factors to give a known starting point for the firmware calibration. However, once the default calibration factors are loaded, you must perform the remainder of the firmware calibration to maintain the accuracy of the oscilloscope.
Service Adjusting the Oscilloscope Vertical self cal 3 After the message "Default calibration factors loaded" is momentarily displayed on the lower left side of the display, press the Vertical softkey. 4 Press the Continue softkey and follow the instructions on the display. The display prompts you to connect the rear-panel CALIBRATOR output simultaneously to channel 1 and channel 2, then to channel 1 and external trigger.
Service Adjusting the Oscilloscope To adjust the high-frequency pulse response In this procedure you adjust the high-frequency pulse response for each channel to a nominal setting for optimum performance over all sensitivity settings.
Service Adjusting the Oscilloscope 10 Adjust the channel 1 high-frequency pulse response for an % overshhot of 5% mininum to 7% maximum. If a low loss 50Ω cable is used (such as 8120-4949), the % overshoot should be 6% minimum to 8% maximum.) 11 Repeat steps 2 through 10 substituting Channel 2 for Channel 1 and ∆V(2) for ∆V(1).
Service Adjusting the Oscilloscope To adjust the display (54615B/16B only) There are no adjustments on the 54616C color display – if the display fails, replace the display assembly. The display adjustments are optional and normally do not require adjustment. You should use this procedure only for the few cases when the display is obviously out of adjustment. Table 4-12 Equipment Required Equipment Critical specifications Digital multimeter Accuracy ±0.
Service Adjusting the Oscilloscope 8 Adjust HB Cont (half bright contrast) for the best contrast between the half bright and full bright blocks. You can readjust Sub Bri, intensity control, and HB Cont to suit your individual preference. 9 Press any key to continue to the next test pattern. Then, adjust H.Hold (horizontal hold) to center the display horizontally. 10 Adjust Focus for the best focus. 11 Press any key to continue to the normal display pattern. Then adjust V.
Service Adjusting the Oscilloscope To adjust the Option 005 offset (R15) The oscilloscope must be calibrated before performing this adjustment. Refer to "To perform the self-calibration" on page 4–25. Table 4-13 Equipment Required Equipment Required Critical Specification Digital Multimeter Adapter 0.1 mV resolution, accuracy ±0.05% BNC (m) to dual banana post Recommended Model/Part Agilent 34401A Agilent 10110B 1 Set up the oscilloscope for the voltage adjustment. a Turn off the oscilloscope.
Troubleshooting the Oscilloscope The service policy for this instrument is replacement of defective assemblies. The following procedures can help isolate problems to the defective assembly. WARNING CAUTION CAUTION The maintenance described in this section is performed with power supplied to the oscilloscope and with the protective covers removed. Only trained service personnel who are aware of the hazards involved should perform the maintenance.
Service Troubleshooting the Oscilloscope To construct your own dummy load 1 Obtain a connector compatible with the connector J3 on the Low Voltage Power Supply (see figure below). 2 Connect the following load resistors to the connector. +5.1 V requires a 4 A load, 1.3 Ω and 20.4 W on pins 9–12. –5.25 V requires a 3 A load, 1.75 Ω and 15.8 W on pins 15–18. +15.75 V requires a 1.3 A load, 12.2 Ω and 20.5 W on pins 5–6. –15.75 V requires a 0.8 A load, 19.7 Ω and 13 W on pin 3.
Service Troubleshooting the Oscilloscope To check out the oscilloscope 1 Is there an interface module connected to the oscilloscope? If yes, do the following steps. If not, go to step 2. a Turn off the oscilloscope. b Remove the module. c Turn on the oscilloscope, then check for the failing symptom. If the failing symptom disappears, replace the module. If not, go to step 2. 2 Turn off the oscilloscope for 30 seconds minimum and then turn on the oscilloscope again.
Service Troubleshooting the Oscilloscope 6 Disconnect the ribbon cable from the display board, then check the following signals on the system board. Table 4-15 Signals from U609 (54615B and 54616B) Signal U817 Pin 7 U817 Pin 24 J803 Pin 13 Name DE Hsync Vsync Frequency 19.72 kHz 19.72 kHz 60.00 Hz Pulse width 38.0 µs 3.0 µs 253.5 µs Voltage 5.0 Vp-p 5.0 Vp-p 5.0 Vp-p Pulse width 48.0 µs 2.90 µs 360.0 µs Voltage 5.0 Vp-p 5.0 Vp-p 5.
Service Troubleshooting the Oscilloscope Low Voltage Power Supply Voltage Tolerances Supply Voltage +5.1 V –5.25 V +15.75 V − 15.75 V Tolerance ±153 mV (+4.947 V to +5.253 V) ±158 mV (–5.092 V to –5.408 V) +1.260 V, –787 mV (+14.963 V to +17.010 V) ±787 mV (−14.963 V to −16.537V) 9 Is the fan running? If yes, go to "To run the internal self-tests," on page 4-41. If not, do the steps below. The Low Voltage Power Supply has a thermal cut-out circuit.
Service Troubleshooting the Oscilloscope To clear error messages If any Fail message appears on the display after cycling power: a Press any menu key and cycle the power on the oscilloscope again. b Hold the menu key down until the message "Key-down power-up executed" or "Keydown power sequence initiated ..." is displayed. c If the original fail message still appears, contact your Agilent Service Center for diagnosis and repair.
Service Troubleshooting the Oscilloscope 2 If the message "Delay cal factors failed checksum–defaults loaded," appears on screen, go to "To perform the self-calibration, " on page 4–25, perform steps 6 through 9, then continue to steps below. This message means that the horizontal delay calibration factors which were stored in NVRAM along with a checksum have been corrupted. This information is written into NVRAM when the horizontal delay calibration is run.
Service Troubleshooting the Oscilloscope 4 If one of the following messages appear on screen: "Results from last delay calibration: Failed" or "Results from last delay calibration: Defaulted" or "Results from last delay calibration: Aborted", go to "To perform the self-calibration," page 4-25 steps 6 through 9, then continue to steps below. The first message means that the most recent calibration of the horizontal delay subsystem failed.
Service Troubleshooting the Oscilloscope To check the Low Voltage Power Supply 1 Disconnect the power cord, then set the oscilloscope on its side. 2 Connect the negative lead of the multimeter to a ground point on the oscilloscope. Connect the power cord and turn on the oscilloscope. 3 Measure the power supply voltages at E10 through E15 on the system board. Power Supply Voltage Tolerances Supply Voltage +5.1 V –5.25 V +15.75 V − 15.75 V Tolerance ±153 mV (+4.947 V to +5.253 V) ±158 mV (–5.092 V to –5.
Service Troubleshooting the Oscilloscope To run the internal self-tests 1 Perform the display test (54615B/16B only.) a Press Print/Utility . b Press the Service Menu softkey, then the Self Tst Menu softkey, and then the Display softkey. c Do the half bright and full bright squares appear? If yes, continue with the steps below. If not, replace the display. d Press any key to continue. Do squares appear in the four corners? If yes, the display is good. If not, replace the display.
Service Troubleshooting the Oscilloscope 3 Perform the keyboard test. a Press the Keyboard softkey. A pictorial diagram of the front panel will appear on the display. b Press each key, and notice that when you press a key a corresponding block on the display fills in. c Rotate the knobs (except the intensity) and notice that an arrow appears on the display that points in the direction you rotate the knob.
Service Troubleshooting the Oscilloscope 5 Perform the ROM test a Press the ROM softkey. b Does the display message say "Test Passed"? If yes, go to next test. If not, (the display message says Test Failed) replace the system board. 6 Perform the RAM test. a Press the RAM softkey. b Does the display message say "Test Passed"? If yes, self-tests are complete. If not, (the display message says "Test Failed") replace the system board.
Service Troubleshooting the Oscilloscope To troubleshoot Option 005 To isolate a malfunction to the Option 005 board, do the following: 1 Disconnect the three cables that connect the Option 005 board to the system board. 2 Verify proper oscilloscope operation, as described in this chapter. 3 If the oscilloscope passes the performance verification and the malfunction still occurs when the Option 005 board is reconnected, then you should replace the Option 005 board.
Replacing Parts in the Oscilloscope This section contains instructions for removing and ordering replaceable assemblies. Also in this section is a parts list for the assemblies and hardware of the oscilloscope that you can order from Agilent. Before working on the oscilloscope, read the safety summary at the back of this book. WARNING CAUTION CAUTION Hazardous voltages are on the CRT, power supply, and display sweep board. To avoid electrical shock, disconnect the power cord from the oscilloscope.
Service Replacing Parts in the Oscilloscope To replace an assembly Refer to the exploded view of the oscilloscope, figure 4-12 (figure 4-14 for Option 005 board), for details on how the oscilloscope fits together. To install an assembly, follow the instructions in reverse order. You will need the following tools to disassemble the oscilloscope: • T15 TORX driver to remove the oscilloscope from the cabinet and to remove the fan. • • • • T10 TORX driver to remove the assemblies from the deck.
Service Replacing Parts in the Oscilloscope To remove the fan 1 Disconnect the fan cable from the power supply board. 2 Using the T15 TORX driver, remove the three screws that hold the fan to the deck. Fan Orientation When installing the new fan, face the fan to blow air into the oscilloscope To remove the front panel 1 Remove the intensity knob by pulling straight out. 2 Disconnect the keyboard ribbon cable from the system board. 3 Remove the probe sense nuts.
Service Replacing Parts in the Oscilloscope When installing the front panel, make sure that the power switch shaft is aligned with its mating hole in the front panel. The front panel swings in to engage the two retainer tabs. Before attempting to engage the retainer tabs, make sure that the six hooks on top of the front panel are fully engaged with their mating holes in the sheet metal.
Service Replacing Parts in the Oscilloscope To remove the display 1 Remove the front panel. 2 Disconnect the ribbon cable and the probe compensation cable from the display. 3 Using the T10 TORX driver, remove the two screws that hold the display to the deck. Make sure that when you reinstall these screws that you use the correct parts. If longer screws are used, they can short the system board to ground. 4 As you lift the display, rotate it off the two tabs on the side of the deck.
Service Replacing Parts in the Oscilloscope To remove the attenuator Use the following procedure to remove the attenuator assembly. When necessary, refer to other removal procedures. CAUTION ELECTROSTATIC DISCHARGE! Use grounded wrist straps and mats when servicing the system board. Electrostatic discharge can damage electronic components. The attenuator is not part of the system board. If the system board is replaced, the attenuator will have to be moved to the replacement board.
Service Replacing Parts in the Oscilloscope To remove and replace an acquisition hybrid CAUTION ELECTROSTATIC DISCHARGE! Use grounded wrist straps and mats when servicing the system board. Electrostatic discharge can damage electronic components. The system board does not need to be removed before replacing an acquisition hybrid. To Remove 1 Use a T-6 Torx driver to remove Figure 4-9 two screws that secure the heatsink spring, then remove the MP21 heatsink.
Service Replacing Parts in the Oscilloscope 3 Loosely install the two hex standoffs and two screws through the top plate. 4 Use 5 mm (3/16 in) and T6 torque drivers set to 0.34 Nm (3 in-lbs) to tighten the standoffs and screws in the following sequence. a Tighten any standoff or screw to specifications. b Tighten the standoff or screw directly opposite the first one to specifications. c Tighten the remaining two standoffs or screws to specifications.
Service Replacing Parts in the Oscilloscope To remove and replace a hybrid connector Two screws (H9) through the hybrid connector (figure 4-9) hold the bottom plate to the underside of the system board. If the hybrid connector is removed, the bottom plate is able to fall away from the board. Disassembly hint The bottom plate may stick to the bottom of the board by itself because of adhesives that fasten an insulator to the plate.
Service Replacing Parts in the Oscilloscope To remove the power supply 1 Remove the fan. 2 Disconnect the ground wire (green wire with the yellow stripe) from the deck. 3 Disconnect the ribbon cable from the power supply board. When reconnecting the cable, position both connectors on their mating pieces, then push on one connector at a time. Do not use more force than required.
Service Replacing Parts in the Oscilloscope To remove the keyboard 1 Remove the front panel. 2 Remove all the knobs by pulling straight out. 3 Flex the bezel of the front panel to unsnap the small keyboard under the display opening. 4 Using the T10 TORX driver, remove the three screws from the large keyboard. Make sure that when you reinstall these screws that you use the correct parts. If longer screws are used, they can damage the front-panel label.
Service Replacing Parts in the Oscilloscope To remove the handle • Rotate the handle down until it is just past the last detent position (about 1/2 inch before the handle touches the bottom of the oscilloscope), then pull the sides of the handle out of the cabinet. To remove the Option 005 board 1 Remove the oscilloscope from the cabinet. a Turn off the oscilloscope and disconnect the power cable. b If a module is installed in the oscilloscope, remove it.
Service Replacing Parts in the Oscilloscope To order a replacement part The system board is part of an exchange program with Agilent Technologies. The exchange program allows you to exchange a faulty assembly with one that has been repaired and performance verified by Agilent Technologies. After you receive the exchange assembly, return the defective assembly to Agilent Technologies. A United States customer has 30 days to return the defective assembly.
Service Replacing Parts in the Oscilloscope • To order a part in the material list, quote the Agilent Technologies part number, indicate the quantity desired, and address the order to your nearest Agilent Technologies Sales Office. • To order a part not listed in the material list, include the model number and serial number of the oscilloscope, a description of the part (including its function), and the number of parts required. Address the order to your nearest Agilent Technologies Sales Office.
Service Replacing Parts in the Oscilloscope Figure 4-12 A6 and A7 on opposite side of A3.
Service Replacing Parts in the Oscilloscope Figure 4–13 MP21 Heatsink Spring H8 Screws (2) MP20 Heatsink MP19 Standoff (2) H10 Screws (2) MP25 Top Plate A6 or A7 Acquisition Hybrid H9 Screws (2) E1 Connector A3 System Board MP24 Bottom Plate A6/A7 Acquisition Hybrid and associated mounting parts 4-60
Service Replacing Parts in the Oscilloscope Table 4-16 54615B, 54616B, and 54616C Replaceable Parts Reference Designator Agilent Part Number Qty Description A1 A2 A2 A2 0950-2735 2090-0316 54620-68801 54620-69801 1 1 1 1 Power supply assembly 54615B/16B display assembly 54616C display assembly 54616C exchange display assembly A3 54630-66501 1 A3 54630-69501 54615B system board (includes Acquisition hybrids A6 and A7, but not attenuators) 54615B exchange system board (includes Acquisition hybri
Service Replacing Parts in the Oscilloscope Reference Designator Agilent Part Number Qty Description H6 H7 H8 H9 H10 0380-0912 0515-1025 0515-0365 0515-2363 0515-1908 1 1 4 4 4 Spacer Machine screw M3 X 26 MS M2 X 0.4, 4mm-lg T6 pan head MS M2 X 0.4, 8mm-lg T6 flat head MS M2 X 0.
Service Replacing Parts in the Oscilloscope Reference Designator Agilent Part Number Qty Description W1 W1 W1 W1 W1 8120-1521 8120-1703 8120-0696 8120-1692 8120-0698 1 W1 W1 W1 W1 8120-2296 8120-2957 8120-4600 8120-4754 W2 W3 W3 54630-61602 54630-61601 54620-61602 1 1 1 Power supply cable 54615B/16B display cable 54616C display cable 10073A 2 Passive probes, 10X Standard power cord Power cord option 900, United Kingdom Power cord option 901, Australia Power cord option 902, Europe Power cord
Service Replacing Parts in the Oscilloscope Figure 4-14 Exploded view of Option 005 and related oscilloscope parts 4-64
Service Replacing Parts in the Oscilloscope Table 4-17 Option 005 Replaceable Parts Reference Designator A3 A5 Agilent Part Number * 54602-66502 Qty Description 1 1 System Board (part of standard instrument) Video Trigger Board H2 H3 0515-0380 0515-0430 5 7 Machine screw M4 X 10 (part of standard instrument) Machine screw M3 X 6 (+2 screws for Option 005) MP6 MP11 54601-00101 54602-64402 1 1 MP30 54602-94305 1 Deck (part of standard instrument) Cabinet (comes with handle and feet installed –
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5 Performance Characteristics
Performance Characteristics The performance characteristics describe the typical performance of the new 54615B, 54616B, and 54616C oscilloscopes. You will notice that some of the characteristics are marked as tested, these are values that you can verify with the performance tests under "Verifying Oscilloscope Performance," on page 4-5.
Performance Characteristics Vertical System Sensitivity 2 mV/div to 5 V/div Accuracy1 ±2.0% of full scale Verniers1 Fully calibrated, accuracy ±2.0 % of full scale Cursor accuracy1, 2, 3 Single cursor accuracy: vertical accuracy ±1.2% of full scale ±0.5% of position value Dual cursor accuracy: vertical accuracy ±0.
Performance Characteristics Horizontal System Horizontal System Sweep speeds 5 s/div to 1 ns/div main and delayed Accuracy ±0.005% of reading Horizontal resolution 20 ps Cursor accuracy1 (∆t and 1/∆t) ±0.005% ±0.2% of full scale ±100 ps Delay jitter ≤1 ppm Pretrigger delay (negative time) 54615B–The greater of 30 µs or 60 divisions, not to exceed 100 s 54616B/16C–The greater of 15 µs or 60 divisions, not to exceed 100 s.
Performance Characteristics Trigger System Trigger System Sources Channels 1, 2, line, and external Internal trigger Sensitivity1 dc to 100 MHz: 100 MHz to 500 MHz: 0.50 div or 5.0 mV 1 div or 10 mV Coupling ac, dc, LF reject, HF reject, and noise reject LF reject attenuates –3 dB for signals below 50 kHz, and HF reject attenuates –3 dB for signals above 50 kHz Modes Auto, Autolevel, Normal, Single, and TV TV triggering Available on channels 1 and 2 TV line and field 0.
Performance Characteristics TV Functions TV Functions Line counting Delay time calibrated in NTSC and PAL line numbers. All field trigger Oscilloscope triggers on the vertical sync pulse in both fields allowing use with non-interlaced video. XY Operation Operating mode X=Channel 1, Y=Channel 2 Bandwidths X-axis and Y-axis same as vertical system Phase difference ±3 degrees at 10 MHz Display System Display 54615B/16B — 7-inch raster CRT 54616C — 5.8-inch Active Matrix Color LCD Display.
Performance Characteristics Acquisition System Acquisition System Maximum sample rate 54615B – 1 GSa/s simultaneous on 2 channels 54616B/16C – 2 GSa/s simultaneous on 2 channels Resolution 8 bits Simultaneous channels Channels 1 and 2 Record length Vectors off: 5000 points 4000 points (200 ns/div, 54615B) 4000 points (100 ns/div, 54616B/16C) 1000 points (peak detect on) Vectors on: 2000 points 1000 points (peak detect on) Roll Mode (vectors off or on): 1000 points 500 points (200 ms/div, channel 1 and 2 on
Performance Characteristics Advanced Functions Advanced Functions Automatic measurements (measurements are continuously updated) Voltage Vavg, Vrms, Vp-p, Vtop, Vbase, Vmin, Vmax Time Frequency, period, + width, – width, duty cycle, rise time, and fall time Cursor Measurements Four cursors can be positioned on the display to make time voltage measurements. The cursors will track changes in position and delay controls. Readout in V, T.
Performance Characteristics General (54615B and 54616B only) General (54615B and 54616B only) Environmental characteristics The instrument meets or exceeds the environmental requirements of MIL-T-28800E for Type III, Class 3, Style D equipment as described below. Ambient temperature (Tested to MIL-T-28800E paragraph 4.5.5.1.1) Operating –10 °C to +55 °C Nonoperating –51 °C to +71 °C Humidity tested to Agilent Technologies environmental specification section 758 paragraphs 4.0, 4.1, and 4.
Performance Characteristics General (54615B and 54616B only) RE01 Part 5 measured at 15.24 cm and exceptioned from 19kHz to 50 kHz. RE02 Part 2 (limited to 1 GHz) Full limits of class A1C and A1F, with option 002 installed; without option 002 installed 10 dB relaxation, 14 kHz to 100 kHz RS03 Part 2, limited to 1 V/meter from 14 kHz to 1 GHz. Slight trace susceptibility from 450 MHz to 600 MHz and at 950 MHz. Vibration Operating 15 minutes along each of the 3 major axes; 0.
Performance Characteristics General (54616C only) General (54616C only) Environmental characteristics These general characteristics apply to the 54616C only. This instrument meets Agilent Technologies environmental specifications (section 750) for class B-1 products.
Performance Characteristics General (54615B, 54616B, and 54616C) General (54615B, 54616B, and 54616C) Physical characteristics Size (excluding handle) Height 172 mm Width 322 mm Depth 317 mm Weight: 6.6 kg Product Regulations Safety IEC 1010-1:1990+A1 / EN 61010-1:1993 UL 3111 CSA-C22.2 No.1010.1:1993 EMC This Product meets the requirement of the European Communities (EC) EMC Directive 89/336/EEC.
Performance Characteristics Option 005 General Performance Characteristics Option 005 General Performance Characteristics Video Standards Video Trigger Modes NTSC PAL PAL-M SECAM Generic Line (number) of Field 1 Field 2 Alternate Fields All Lines Field 1 Defined as that field with the 3 lines of vertical sync starting at line 4. Is actually color field 1 or color field 3. Field 2 Defined as that field with the 3 lines of vertical sync starting at the midpoint of line 3.
Performance Characteristics Option 005 Trigger System Option 005 Trigger System Internal trigger Sensitivity Performance remains unchanged Coupling Performance remains unchanged Modes Performance remains unchanged Holdoff Performance remains unchanged TV triggering Available on channels 1 and 2 only TV line and field 0.
Glossary This glossary is organized into two parts: oscilloscope and TV/video trigger terms. The TV/video trigger terms apply to oscilloscopes with Option 005 installed. Oscilloscope Terms 50Ω Input Protection This only functions when the scope is powered on. The 50Ω load will typically disconnect if greater than 5 Vrms is detected. However, the inputs could still be damaged, depending on the time constant of the signal.
Glossary Delayed Gives an expanded view of the main sweep. Deskewing The removal of time offset errors between two signals. The error is typically due to differences in either cable lengths or characteristics. Also called Time Null. Display Allows selection of either normal, peak detect, or averaged display modes. Erase Clears the display. External Trigger Extra input to the oscilloscope normally used for triggering. Field 1 Triggers on the field 1 portion of the video signal.
Glossary Normal If a trigger signal is present and the trigger conditions are met, a waveform is displayed. If there is no trigger signal, the oscilloscope does not trigger and the display is not updated. Recall Recalls a selected frontpanel setup that you saved to one of 16 memory locations. Memory selection is with either a softkey or the knob closest to the Cursors frontpanel key.
Glossary Skew Time offset between two signals, typically due to differences in either cable lengths or characteristics. Time Ref Lft Cntr (time reference left or center) Sets the time reference to either one graticule in from the left edge of the display or to center of the display. Slope/Coupling Allows access to the trigger slope and input coupling menus. Trace Allows access to the trace storage keys. Slope Selects either the rising or falling edge of the signal to trigger the oscilloscope.
Glossary TV/Video Trigger Terms Blanking Level The level of the composite picture signal that separates the range containing picture information from the range containing synchronizing information. (IEEE Definition) Chrominance That property of light which produces a sensation of color in the human eye apart from any variation in luminance that may be present. Chrominance Signal That portion of the color television signal which contains the color information.
Glossary Field 2 Triggers on the field 2 portion of the video signal. Frame One complete picture consisting of two fields of interlaced scanning lines. HF Reject (high frequency reject) Adds a low pass filter with a 3 dB point at 50 KHz to the trigger path. Holdoff Keeps the trigger from rearming for an amount of time set by the holdoff knob. Internal Trigger The oscilloscope triggers from a channel input that you choose.
Glossary PAL Phase Alternating Line or Phase Alteration Line rate. Color television standards used in Europe. A 625 line, 50 Hz field system. Eight fields for picture completion. PAL-M Phase Alternating Line or Phase Alteration Line rate. A version of the European system adapted to a 525 line, 60 Hz field, 4.2 MHz bandwidth used in Brazil. SECAM SEquentiel Couleur Avec Memoire. An acronym derived from the French phrase meaning Sequential Color with Memory.
Glossary–8
Index A ac coupling, 1–8, 1–13, 5–3, 5–5 accuracy cursors, 5–3 to 5–4 horizontal, 5–4 vertical, 5–3 acquisition characteristics, 5–7 Active Cursor, 2–23 adjustments display, 4–29 to 4–30 high frequency, 4–21 to 4–31 low frequency, 4–21 to 4–31 power supply, 4–22 to 4–23 advance functions, 5–8 All Fields, 3–9 Alt Fld See alternate fields Alternate color palettes, 1–17 alternate fields, 3–5 altitude characteristics, 5–9, 5–11 ambient temperature, 4–21, 5–9, 5–11 assembly replacement, 4–46 attenuation factor
Index F fail messages clearing, 4–37 keydown powerup, 4–37 fall time, 2–16, 2–18 Fast Fourier Transform (FFT), 3–18 to 3–19 Field 1, 3–8 Field 1 softkey, 2–40 Field 2, 3–8 Field 2 softkey, 2–40 fields all, 3–9 alternate, 3–5 even, 3–10 to 3–11 Field 1, 3–5, 3–10 to 3–11 Field 2, 3–5, 3–10 to 3–11 Field 3, 3–10 to 3–11 Field 4, 3–10 odd, 3–10 to 3–11 firmware calibration, 4–25 Freq softkey, 2–14 frequencies multi-burst, 3–14 frequency measurements, 2–14 to 2–15, 2–17 reject, 2–31, 2–40, 5–5 frequency domain
Index O odd field, 3–10 to 3–11 offset adjusting option 005, 4–31 Option 005, 3–2 characteristics, 5–13 offset adjustment, 4–31 replacing circuit board, 4–56 trigger system characteristics, 5–14 triggering, 3–5 troubleshooting, 4–45 verify vertical output, 4–18 oscilloscope configuration preset, 2–35 preset configuration, 2–35 oscilloscope maintenance, 4–5 to 4–18 output vertical, 3–20 outputs rear panel, 3–20 P PAL, PAL-M, 3–4, 3–6, 3–11 palettes,color, 1–18 to 1–19 Peak Det softkey, 2–10 peak detect, 2–1
Index time negative, 1–12 time base accuracy, 5–4 preset configuration, 2–35 range, 1–11, 5–4 setup, 1–11 to 1–12 time cursor, 3–12 time domain, 3–18 to 3–19 Time key, 2–14 time measurements duty cycle, 2–16 to 2–18 fall time, 2–16 to 2–18 frequency, 2–16 to 2–18 period, 2–16 to 2–18 rise time, 2–16 to 2–18 width, 2–16 to 2–18 time reference, 2–4 Time/Div, 2–3, 3–14 trace memory, 2–33 recall, 2–33 softkey, 2–33 to save, 2–33 Trace Mem softkey, 2–33 trigger characteristics, 5–5, 5–14 complex waveforms, 2–12
DECLARATION OF CONFORMITY according to ISO/IEC Guide 22 and EN 45014 Manufacturer’s Name: Agilent Technologies Manufacturer’s Address: Colorado Springs Division 1900 Garden of the Gods Road Colorado Springs, CO 80907 USA declares, that the product Product Name: Digitizing Oscilloscope Model Number(s): 54615B, 54616B, and 54616C Product Option(s): All conforms to the following Product Specifications: Safety: IEC 1010-1:1990+A1 / EN 61010-1:1993 UL 3111 CSA-C22.2 No. 1010.
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