Agilent 1000A Series Oscilloscopes Service Guide s1
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Agilent 1000A Series Oscilloscopes—At a Glance The Agilent 1000A Series oscilloscopes are low- cost portable digital storage oscilloscopes (DSOs) that deliver these powerful features: • Two and four- channel, 60 MHz, 100 MHz, and 200 MHz bandwidth models. • Bright 5.7 inch QVGA (320 x 240) TFT color LCD display and small footprint (to save bench space). • Up to 2 GSa/s sample rate. • Up to 20 kpts memory. • Up to 400 wfms/s refresh rate.
In This Book This guide contains service information for the Agilent 1000A Series oscilloscopes. 1 Service Describes oscilloscope maintanance, performance testing, and what to do if your oscilloscope requires service.
Contents Agilent 1000A Series Oscilloscopes—At a Glance In This Book Figures 4 7 Tables 1 9 Service 11 Cleaning the Oscilloscope 12 Testing Performance 13 Before Testing Performance 14 To test DC gain accuracy 16 To test analog bandwidth, maximum frequency To test time scale accuracy 29 To test trigger sensitivity 32 Performance Test Record Contacting Agilent Safety Notices Warnings 39 40 41 41 Safety Symbols Index 21 35 Returning the Oscilloscope to Agilent for Service A 3 42 43 Agil
Contents 6 Agilent 1000A Series Oscilloscopes Service Guide
Figures Figure 1. Averages Menu Item 17 Figure 2. Connecting Equipment for DC Gain Accuracy Test 18 Figure 3. Vavg Menu Item 19 Figure 4. Connecting Equipment for Maximum Frequency Check Test Figure 5. Channel 1 Vertical Scale Setting 24 Figure 6. Channel 1 Horizontal Scale Setting 24 Figure 7. Averages Menu Item 25 Figure 8. Signal Generator Waveform 26 Figure 9. Connecting Equipment for Time Scale Accuracy Test 30 Figure 10.
Figures 8 Agilent 1000A Series Oscilloscopes Service Guide
Tables Table 1. Agilent 1000A Series Oscilloscope Models 3 Table 2. Equipment Required to Perform All Tests 14 Table 3. DC Gain Accuracy Specification 16 Table 4. Equipment Required for DC Gain Accuracy Test 16 Table 5. Analog Bandwidth Specification 21 Table 6. Equipment Required for Analog Bandwidth Test 22 Table 7. Oscilloscope Models and Signal Generator Frequency 27 Table 8. Time Scale Accuracy Specification 29 Table 9. Equipment Required for Time Scale Accuracy Test 30 Table 10.
Tables 10 Agilent 1000A Series Oscilloscopes Service Guide
Agilent 1000A Series Oscilloscopes Service Guide 1 Service Cleaning the Oscilloscope 12 Testing Performance 13 Performance Test Record 35 Returning the Oscilloscope to Agilent for Service 39 Contacting Agilent 40 This chapter describes oscilloscope maintanance, performance testing, and what to do if your oscilloscope requires service.
1 Service Cleaning the Oscilloscope If the instrument requires cleaning: 1 Remove power from the instrument. 2 Clean the external surfaces of the instrument with a soft cloth dampened with a mixture of mild detergent and water. CAUTION Do not use too much liquid in cleaning the oscilloscope. Water can enter the oscilloscope’s front panel, damaging sensitive electronic components. 3 Make sure that the instrument is completely dry before reconnecting it to a power source.
Service 1 Testing Performance This section documents performance test procedures. Performance verification for the products covered by this manual consists of three main steps: • Performing the internal product self- tests to ensure that the measurement system is functioning properly. • Calibrating the product. • Testing the product to ensure that it is performing to specification.
1 Service Before Testing Performance Table 2 Equipment Required to Perform All Tests Description Required for Test Critical Specifications Recommended Model/Part Numbers Digital Multimeter DC Gain Accuracy DC voltage measurement accuracy better than ±0.1% of reading Agilent 34401A Power Supply DC Gain Accuracy 0 V to 35 V DC; 10 mV resolution Agilent E3633A or Agilent E3634A Signal Generator Analog Bandwidth 100 kHz to 1 GHz at 200 mVrms, 0.
Service NOTE 1 Let the oscilloscope warm up before testing. The oscilloscope under test must be warmed up (with the oscilloscope application running) for at least 30 minutes prior to the start of any performance test. Calibration 1 Push the [Utility] key on the front panel. 2 In the Utility menu, press Self-Cal. 3 Follow the on- screen instructions.
1 Service To test DC gain accuracy CAUTION Ensure that the input voltage to the oscilloscope never exceeds 300 Vrms. Table 3 DC Gain Accuracy Specification DC Gain Accuracy 2 mV/div to 5 mV/div: ±4.0% full scale 10 mV/div to 5 V/div: ±3.0% full scale Full scale is defined as 8 vertical divisions. The major scale settings are 2 mV, 5 mV, 10 mV, 20 mV, 50 mV, 100 mV, 200 mV, 500 mV, 1 V, 2 V, and 5 V.
Service Figure 1 1 Averages Menu Item 6 Set the channel 1 probe attenuation to 1X. 7 Set the channel 1 vertical sensitivity value to 2 mV/div. 8 Set the power supply to +6 mV. 9 Connect the equipment as shown in Figure 2.
1 Service Oscilloscope Power Supply Digital Multimeter BNC tee BNC (f) to dual banana Figure 2 Connecting Equipment for DC Gain Accuracy Test 10 Press [Measure]. 11 Press the Voltage softkey. 12 Turn the below.
Service 1 Vavg measurement Figure 3 Vavg Menu Item 13 For each of channel 1’s vertical sensitivities in the DC Gain Test section of the “Performance Test Record” on page 35: a For the positive (+) power supply setting: i Record the DMM voltage reading as VDMM+. ii Record the oscilloscope Vavg reading as VScope+. b For the negative (- ) power supply setting: i Record the DMM voltage reading as VDMM- . ii Record the oscilloscope Vavg reading as VScope- .
1 Service 17 Press the [Default Setup] front panel key. 18 Set the channel’s probe attenuation to 1X. 19 Set the channel’s vertical sensitivity value to 2 mV/div. 20 Press [Measure]. 21 Press the Voltage softkey. 22 Turn the entry knob to select the Vavg measurement. 23 For each of the channel’s vertical sensitivities in the DC Gain Test section of the “Performance Test Record” on page 35: a For the positive (+) power supply setting: i Record the DMM voltage reading as VDMM+.
Service 1 To test analog bandwidth, maximum frequency CAUTION NOTE Ensure that the input voltage to the oscilloscope never exceeds 300 Vrms. This procedure is the only acceptable method for testing the bandwidth of a 1000A Series oscilloscope.
1 Service Table 6 22 Equipment Required for Analog Bandwidth Test Description Critical Specifications Recommended Model/Part Numbers Signal Generator 100 kHz to 1 GHz at 200 mVrms, 0.01 Hz frequency resolution, jitter: < 2 ps Agilent 8648A, Agilent E4400B, or Agilent N5181A. Power Meter Agilent E-series with power sensor compatibility Agilent E4418B Power Sensor 100 kHz to 1 GHz ±3% accuracy Agilent 8482A Power Splitter Outputs differ by < 0.
Service 1 1 Connect the equipment as shown in Figure 4. Power Meter E4418B Oscilloscope Signal Generator 50W feed through Power splitter 11667B Power sensor cable SMA to BNC adapter Power sensor 8482A Figure 4 SMA cable Type-N (m) to SMA (f) adapter Connecting Equipment for Maximum Frequency Check Test 2 Preset and calibrate the power meter according to the instructions found in the power meter manual. 3 Set up the Power Meter to display measurements in units of Watts.
1 Service Figure 5 Channel 1 Vertical Scale Setting 8 Set the horizontal scale to 500 ns/div.
Service 1 9 Press [Acquire]. 10 Press the Acquisition softkey until “Average” appears. 11 Press Average and turn the Figure 7 entry knob until “8” appears. Averages Menu Item 12 Press [Measure]. 13 Press the Voltage softkey. 14 Turn the entry knob to select the Vpp menu item. 15 Set the signal generator to a 1 MHz sine wave with a peak- to- peak amplitude of about 6 divisions as it appears on the oscilloscope screen.
1 Service Vpp reading Figure 8 Signal Generator Waveform 16 Using the Vpp reading, calculate the Vrms value using the following expression and record it in the “Performance Test Record” on page 35: Vpp 1MHz Vout 1MHz = ----------------------2 2 For example, if Vpp = 1.20 V: 1.20 1.20 Vout 1MHz = ---------- = ------------- = 424 mV 2 2 2.
Service 1 18 Calculate the reference gain as follows: Vout 1MHz Gain 1MHz = ---------------------------Vin 1MHz Record this value in the Calculated Gain @ 1 MHz column of the “Performance Test Record” on page 35. 19 Change the signal generator frequency to the value for the model being tested as shown in the table below.
1 Service For example, if Pmeas = 3.65 mW: Vinmax = 3.65 mW × 50Ω = 427 mV 23 Calculate the gain at the maximum frequency using the expression and record it in the “Performance Test Record” on page 35: Gain max = 20 log 10 ( Vout max ) ⁄ ( Vin max ) ---------------------------------------------------------Gain 1MHz For example, if (Vout @ Max Frequency) = 371 mV, (Vin @ Max Frequency) = 427 mV and Gain @ 1 MHz = 0.
Service 1 To test time scale accuracy In this test you measure the absolute error of the timebase oscillator and compare the results to the specification. Time scale accuracy refers to the absolute accuracy of the oscilloscope's time scale. Because time scale accuracy depends directly on the specifications of a crystal oscillator, it is comprised of these components: • An initial accuracy component — applies to the oscilloscope's accuracy on the date of its shipment to the customer.
1 Service Table 9 Equipment Required for Time Scale Accuracy Test Description Critical Specifications Recommended Model/Part Numbers Signal Generator 100 kHz - 1 GHz, 0.
Service 1 3 Set up the oscilloscope: a Press [Auto-Scale]. b Set the oscilloscope Channel 1 probe attenuation to 1X. c Set the oscilloscope Channel 1 vertical sensitivity to 200 mV/div. d Set the oscilloscope horizontal sweep speed control to 5 ns/div. e Adjust the intensity to get a sharp, clear trace. f Adjust the oscilloscope’s trigger level so that the rising edge of the waveform at the center of the screen is located where the center horizontal and vertical grid lines cross (center screen).
1 Service To test trigger sensitivity This test verifies the trigger sensitivity. In this test, you apply a sine wave to the oscilloscope at the bandwidth limits. You then decrease the amplitude of the signal to the specified levels, and check to see if the oscilloscope is still triggered. Table 10 Trigger Sensitivity Specification Trigger sensitivity Ch 1, 2, 3, 4 (DC coupling): ≥ 5 mV/div: 1 div from DC to 10 MHz, 1.5 div from 10 MHz to full bandwidth < 5 mV/div: 1 div from DC to 10 MHz, 1.
Service 1 1 Connect the equipment (see Figure 10). a Connect the signal generator output to the oscilloscope channel 1 input. Oscilloscope Signal Generator 50W feed through BNC cable Type-N (m) to BNC (f) adapter Figure 10 Connecting Equipment for Trigger Sensitivity Test 2 Verify the trigger sensitivity when the vertical scale is ≥ 5 mV/div. For each of the bandwidth boundaries (maximum bandwidth and 10 MHz): a Press the [Default Setup] key.
1 Service The trigger is stable when the displayed waveform is stable. If the trigger is not stable, try adjusting the trigger level. If adjusting the trigger level makes the trigger stable, the test still passes. h Record the result as Pass or Fail in the “Performance Test Record” on page 35. Repeat these steps for the remaining oscilloscope channels. 3 Verify the trigger sensitivity when the vertical scale is < 5 mV/div.
Service 1 Performance Test Record Table 12 Performance Test Information Serial No. ______________________________________ Test by _____________________________ Test Interval ____________________________________ Work Order No. ______________________ Recommended Next Testing ________________________ Temperature ____________ Table 13 DC Gain Test Vertical Sensitivity Power Supply Setting VDMM+ VDMM- VScope+ VScope- Calculated DC Gain Offset Gain Test Limits Channel 1 2 mV/div ±6 mV +0.
1 Service Table 13 DC Gain Test (continued) Vertical Sensitivity Power Supply Setting VDMM+ VDMM- VScope+ VScope- Calculated DC Gain Offset Gain Test Limits Channel 2 2 mV/div ±6 mV +0.96 to +1.04 5 mV/div ±15 mV +0.96 to +1.04 10 mV/div ±30 mV +0.97 to +1.03 20 mV/div ±60 mV +0.97 to +1.03 50 mV/div ±150 mV +0.97 to +1.03 100 mV/div ±300 mV +0.97 to +1.03 200 mV/div ±600 mV +0.97 to +1.03 500 mV/div ±1.5 V +0.97 to +1.03 1 V/div ±3.0 V +0.97 to +1.03 2 V/div ±6.
Service Table 13 1 DC Gain Test (continued) Vertical Sensitivity Power Supply Setting VDMM+ VDMM- VScope+ VScope- Calculated DC Gain Offset Gain Test Limits Channel 4 2 mV/div ±6 mV +0.96 to +1.04 5 mV/div ±15 mV +0.96 to +1.04 10 mV/div ±30 mV +0.97 to +1.03 20 mV/div ±60 mV +0.97 to +1.03 50 mV/div ±150 mV +0.97 to +1.03 100 mV/div ±300 mV +0.97 to +1.03 200 mV/div ±600 mV +0.97 to +1.03 500 mV/div ±1.5 V +0.97 to +1.03 1 V/div ±3.0 V +0.97 to +1.03 2 V/div ±6.
1 Service Table 15 Time Scale Accuracy Limits Measured time scale error (ppm) Pass/Fail ±50 ppm from 0 °C to 30 °C ±50 ppm + 2 ppm per °C from 30 °C to 45 °C + 5 ppm * (years since manufacture) Table 16 Trigger Sensitivity Test Limits Ch1 Ch2 C3 Ch4 ≥ 5 mV/div: 1.5 division at maximum bandwidth ≥ 5 mV/div: 1 division at 10 MHz < 5 mV/div: 1.
Service 1 Returning the Oscilloscope to Agilent for Service Before shipping the oscilloscope to Agilent Technologies, contact your nearest Agilent Technologies oscilloscope Support Center (or Agilent Technologies Service Center if outside the United States) for additional details. 1 Write the following information on a tag and attach it to the oscilloscope. • Name and address of owner. • Oscilloscope model number. • Oscilloscope serial number. • Description of the service required or failure indications.
1 Service Contacting Agilent Information on contacting Agilent Technologies can be found at www.agilent.com/find/contactus.
Agilent 1000A Series Oscilloscopes Service Guide A Safety Notices Warnings 41 Safety Symbols 42 This apparatus has been designed and tested in accordance with IEC Publication 1010, Safety Requirements for Measuring Apparatus, and has been supplied in a safe condition. This is a Safety Class I instrument (provided with terminal for protective earthing). Before applying power, verify that the correct safety precautions are taken (see the following warnings).
A Safety Notices • Whenever it is likely that the ground protection is impaired, you must make the instrument inoperative and secure it against any unintended operation. • Service instructions are for trained service personnel. To avoid dangerous electric shock, do not perform any service unless qualified to do so. Do not attempt internal service or adjustment unless another person, capable of rendering first aid and resuscitation, is present.
Index A L V analog bandwidth - maximum frequency check, 21 at a glance, 3 LCD display, 3 voltage measurements, 3 M W B warnings, 41 waveforms, recording/playing-back, 3 built-in help, 3 math function waveforms, 3 memory, 3 model number, 39 C P calibration, 15 cleaning the oscilloscope, 12 counter, frequency, 3 cursor measurements, 3 performance test interval, 13 performance test record, 13 performance, testing, 13 D DC gain accuracy test, 16 digital filter, 3 E equipment for performance tes
Index 44 Agilent 1000A Series Oscilloscopes Service Guide
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