Agilent 54645D MSO Tutorial Excerpts from Agilent 54645D Mixed-Signal Oscilloscope Chapter 2: Front-Panel Overview • To use digital channels to view a signal • To display signals automatically using Autoscale • To apply the default factory configuration • To adjust oscilloscope vertical scaling • To turn analog channels on and off • To rearrange the analog channels • To turn digital channels on and off (Agilent 54645D) • To rearrange digital channels (Agilent 54645D) • To operate the time base controls • To
Front-Panel Overview To use digital channels to view a signal To use digital channels to view a signal • To configure the instrument quickly, press Autoscale . • To undo the effects of autoscale, press Setup , then press Undo Autoscale. • To set the instrument to the factory-default measurement configuration, press Setup , then press Default Setup. Example Install grabbers on channels D0 and D1.
Front-Panel Overview To display signals automatically using Autoscale To display signals automatically using Autoscale • To configure the instrument quickly, press Autoscale . Autoscale displays all connected signals that have activity. • To undo the effects of autoscale, press Setup , then press Undo Autoscale.
Front-Panel Overview To apply the default factory configuration During Autoscale, the delay is set to 0.0 seconds, the Time/Div setting is a function of the input signal (about 2 periods of the triggered signal on the screen), and the triggering mode is set to edge. The instrument stays in Normal or Peak Detect display mode, depending on what was selected when Autoscale was performed. Vectors remain in the state they were before the Autoscale.
Front-Panel Overview To adjust oscilloscope vertical scaling To adjust oscilloscope vertical scaling This exercise guides you through the vertical keys, knobs, and status line. 1 Center the signal on the display using the Position knob. The Position knob moves the signal vertically; the signal 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.
Front-Panel Overview To adjust oscilloscope vertical scaling • Toggle each softkey and notice which keys cause the status line to change. Channels 1 and 2 have a vernier softkey that allows the Volts/Div knob to change the vertical step size in smaller increments. These smaller increments are calibrated, which result in accurate measurements, even with the vernier turned on. • To turn the channel off, either press (for HP 54645A) or (for HP 54645D) a second time or press the left-most softkey.
Front-Panel Overview To adjust oscilloscope vertical scaling To Expand the Vertical Signal When changing the Volts/Div for analog channels, you can have the signal expand (or compress) about the signal offset or the ground point. This works well with two signals displayed, because you can position and see them both on the screen while you change the amplitude. • To expand the signal about the offset, press Print/Utility . Then select System Config and Expand Vertical Center.
Front-Panel Overview To turn analog channels on and off To turn analog channels on and off • To turn off analog channel #1, press 1 (on the HP 54645A), or A1 (on the HP 54645D), then press the leftmost softkey until Off is highlighted. • To turn off analog channel #2, press 2 (on the HP 54645A), or A2 (on the HP 54645D), then press the leftmost softkey until Off is highlighted.
Front-Panel Overview To turn digital channels on and off (HP 54645D) To turn digital channels on and off (HP 54645D) • To turn digital channels 0 through 7 on, press D0-D15 , then press the D0 - D7 On softkey. To turn these channels off, press the Off softkey. • To turn digital channels 8 through 15 on, press D0-D15 , then press the D8 - D15 On softkey. To turn these channels off, press the Off softkey. • To turn on an individual channel, press D0-D15 .
Front-Panel Overview To rearrange the digital channels (HP 54645D) To rearrange the digital channels (HP 54645D) 1 Turn the Select knob to choose the digital channel you want to move. Only channels that are currently on may be moved. 2 Turn the Position knob to move the selected channel to a new position. Turning the Position knob counter-clockwise moves the channel down; turning the knob clockwise moves the channel up.
Front-Panel Overview To operate the time base controls To operate the time base controls The following exercise guides you through the time base keys, knobs, and status line. • Turn the Time/Div knob and notice the change it makes to the status line. The Time/Div knob changes the sweep speed from 2 ns to 50 s (HP 54645A) and from 5 ns to 50 s (HP 54645D) in a 1-2-5 step sequence, and the value is displayed in the status line.
Front-Panel Overview To start and stop an acquisition All events displayed left of the trigger point ▼ happened before the trigger occurred, and these events are called pre-trigger information. You will find this feature very useful because you can now see the events that led up to the trigger point. Everything to the right of the trigger point ▼ is called post-trigger information. The amount of delay range (pre-trigger and post-trigger information) available depends on the sweep speed selected.
Front-Panel Overview To use the Entry and Select knobs To use the Entry and Select knobs The Select knob (HP 54645D only) always changes the selected channel. In most menus, its order is screen-oriented. In the simple pattern and advanced pattern definition menus, it moves from the lowest to highest number on clockwise rotation. The Entry knob increments and decrements the selected field—for example, glitch time and setup memory number. It also moves the selected cursor when cursors are on.
Front-Panel Overview 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 scope signals, and timing measurements on digital channels. 1 Connect a signal to the oscilloscope and obtain a stable display. 2 Press Cursors .
Front-Panel Overview To make cursor measurements On HP 54645D, the Readout softkey gives a reading of the time or voltage cursor measurement. • For the time cursor readout, you can select Time, Hex, Binary, or Degrees. Binary displays all digital channels by channel number. Hex shows only the displayed channels, with the top channel displayed as the most significant bit.
Front-Panel Overview 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 .
Front-Panel Overview To modify the graticule To modify the graticule 1 Press Display . 2 Press one of the Grid softkeys to define the graticule used for the waveform area on the display. • Frame has a set of hash marks along the top and bottom of the display only. Major divisions are indicated by longer hash marks. • Full has a set of hash marks through the center of the waveform display area, with major divisions indicated by a full-height dotted line through the waveform display.
Front-Panel Overview To print the display To print the display You can print the waveform display and status line to an HP printer or Epson-compatible printer attached to one of these optional interface modules: HP 54650A HP-IB Interface Module HP 54652A Parallel Interface Module HP 54652B RS-232/Parallel Interface Module HP 54657A Measurement/Storage Module (HP-IB) HP 54659B Measurement/Storage Module (RS-232/Parallel) 1 If you have one of these modules installed, configure the module first.
Triggering HP 54645A/D Oscilloscopes Trigger types Trigger types These trigger types are available: • Edge trigger • Pattern trigger • Advanced trigger Changes to the trigger specification are applied when you make them. If the oscilloscope is stopped when you change a trigger specification, the scope will use the new specification when you press Run/Stop, Single, or Autostore.
Triggering HP 54645A/D Oscilloscopes Trigger types Glitch Trigger The advanced glitch trigger menu lets you select the analog (A1 or A2) or digital (D0-D15) channel on which to capture a glitch event. You specify the polarity and duration qualifier—either less than (<), greater than (>), or a range—for the glitch. The HP 54645D can capture glitches >8 nanoseconds and <100 seconds.
Triggering HP 54645A/D Oscilloscopes Trigger types Specifying a Logic Threshold You can specify a threshold for the logic channels. See “To change the logic threshold for input signals” in chapter 4 for information about setting a threshold on the HP 54645D. Advanced Pattern Trigger In advanced pattern trigger, you define a maximum of two pattern and edge sources that are combined with a variety of operators to form the complete trigger specification.
Triggering HP 54645A/D Oscilloscopes Trigger types Sharing of Sources The source definitions for the simple pattern trigger are shared with the Pattern 1 and Edge 1 sources of the advanced pattern trigger specification. Thus, changes to the simple pattern trigger will affect that specification, and changes to Pattern 1 and Edge 1 in the advanced pattern trigger specification will affect the simple pattern trigger. Logical Combinations In advanced trigger, settings within pattern terms are logically ANDed.
Triggering HP 54645A/D Oscilloscopes To define an edge trigger To define an edge trigger 1 Press Edge . 2 Select a channel as the trigger source using either the Select knob or by pressing a Trigger Source softkey. You can choose a channel that is turned off as the source for the edge trigger. 3 Press one of the Edge softkeys to choose whether the trigger will occur on the rising or falling edge.
Triggering HP 54645A/D Oscilloscopes To define a pattern trigger To define a pattern trigger 1 Press Pattern . 2 For each analog channel (A1 or A2) or digital channel (D0-D15) you want to include in the desired pattern, press the Source softkey to select the channel, or rotate the Entry knob or the Select knob.
Triggering HP 54645A/D Oscilloscopes To use glitch triggering To use glitch triggering 1 Press Advancd . Then select Glitch. 2 Select Glitch Menu. 3 Select the analog channel (A1 or A2) or digital channel (D0-D15) source for the trigger by pressing the Source softkey until the desired source is highlighted. 4 Select positive or negative polarity for the glitch to capture.
Triggering HP 54645A/D Oscilloscopes To define an advanced pattern trigger To define an advanced pattern trigger The advanced triggering operation depends on previous selections in the Advanced Trigger menu. 1 Press Advancd . Then select Pattern. 2 Press the Overview softkey to turn on the trigger overview, if desired. The trigger overview display shows all the choices available in this menu. 3 Select Pattern Menu.
Triggering HP 54645A/D Oscilloscopes To define an advanced pattern trigger 5 Select the source(s) for the trigger operator by pressing the leftmost Source softkey until the desired source is highlighted. Refer to the table of trigger operators and sources to see the sources and operators with which they can be used.
Triggering HP 54645A/D Oscilloscopes To define an advanced pattern trigger 9 To set up a pattern trigger source, do the following: a Select a channel for the source. • To set the condition for that channel, press the L, H, or X softkey. • To clear the conditions for all channels, press Clear Pattern. b Repeat step a for all channel sources you want to define. c Press Previous Menu to return to the Advanced Pattern Trigger menu.
Triggering HP 54645A/D Oscilloscopes To define an advanced pattern trigger Setup rules Remembering the following rules will make it easier to work with the advanced triggering capabilities: • Duration operators are valid when only pattern terms are involved. Duration is not selectable when any edge term is selected as a source. • When you have selected a combination source, like Pattern 1 AND Edge 1, you cannot directly define the pattern or edge.
