Page 1 Agilent Test & Measurement website, www.tm.agilent.com. HP References in this Manual This manual may contain references to HP or Hewlett-Packard. Please note that Hewlett-Packard's former test and measurement, semiconductor products and chemical analysis businesses are now part of Agilent Technologies. We have made no changes to this manual copy.
Page 2 User and Service Guide Publication Number 54620-97011 October 1995 (pdf version Dec 1998) For Safety Information, Warranties, and Regulatory information, see the pages behind the Index. © Copyright Hewlett-Packard Company 1994, 1995 All Rights Reserved HP 54620A/C Logic Analyzer...
Page 3: Measurements
The HP 54620A/C at a Glance Display shows the current input signals Storage Keys begin and end data and much more acquisition • • Up to sixteen (16) channels in normal Run/Stop starts and stops continuous or delayed mode acquisitions •...
Page 4 Delayed CHANNEL Time/Div Select 5 ns INPUTS Label Logic levels Position Trigger out Ext trigger in L i n e 1 MQ 40 V Max Channel Inputs Trigger Brightness Input / Softkeys Control (for Power Output HP 54620A only) Micro-grabbers...
Page 5: Ensuring Accurate
In This Book The HP 54620A/C User and Service Guide is your guide to using the features of the Logic Analyzer in the design and troubleshooting of digital system circuitry. Chapter 1, “Getting Started,” explains how to set up the analyzer and make basic measurements.
Page 6: Testing, Adjusting, And
Getting Started Making Analyzer Measurements Solving Problems Ensuring Accurate Measurements Testing, Adjusting, and Troubleshooting the Analyzer Replaceable Parts Performance Characteristics Messages Glossary Index...
Page 8: Table Of Contents
Contents 1 Getting Started Preparing the Analyzer 21 To check package contents 22 To check optional accessories 24 To power-on the logic analyzer 27 To adjust the handle 28 To adjust display brightness 29 Using Color 30 To select the color palettes and observe colors 31 To assign colors to channels 33 To print in color 34 Making Measurements 35...
Page 9 Contents Using Labels 59 To turn the label display on or off 59 To assign a label to a channel 60 To define a new label 62 To initialize the label list 64 Triggering the Analyzer 65 Trigger types 65 To define the trigger mode 70 To define an edge trigger 72 To define a pattern trigger 73...
Page 10 Contents Saving and Recalling the Configuration 111 Using memories to save and recall configurations 111 To save a trace waveform 114 To recall a trace waveform 115 To clear a previously saved trace 116 To save the instrument setup 117 To recall the instrument setup 118 To reset the instrument setup 119 3 Solving Problems...
Page 11 Contents Adjusting the Logic Analyzer 159 To adjust the power supply 160 To adjust the display (HP 54620A only) 162 Troubleshooting the Logic Analyzer 164 To troubleshoot the logic analyzer 165 To check the LVPS 168 Testing Threshold Accuracy 169 Step 1.
Page 12 Contents 7 Performance Characteristics 8 Messages Messages 209 Glossary Index HP 54620 Documentation...
Page 14 Figure 1. Using the Logic Analyzer 19 Figure 1A. Refining the Trigger Specification 20 Figure 2. Items Supplied with the HP 54620A/C Logic Analyzer 23 Figure 3. Optional Accessories for the HP 54620A/C Logic Analyzer 25 Figure 4. HP 54620A Brightness Control 29 Figure 5.
Page 15 Contents Figure 33. Trace Memory Save/Recall 112 Figure 34. Setup Memory 113 Figure 35. Relationship Between Time base and Analyzer Functions 129 Figure 36. Acquisition Memory 131 Figure 37. Memory Bar 132 Figure 38. Single Acquisition, Time Reference Center, Positive Delay of 75 µs 134 Figure 39.
Page 16: Replaceable Parts
Table 22. Measurement Functions 202 Table 23. Setup Functions 203 Table 24. Power Requirements 203 Table 25. General Characteristics for HP 54620A Only 204 Table 26. General Characteristics for HP 54620A and HP 54620C 205 Table 27. General Characteristics for HP 54620C Only 206...
Page 18: Getting Started
Getting Started...
Page 19 Getting Started When you use the logic analyzer to help test and troubleshoot your systems, you will follow the general process shown in figure 1: • Prepare the analyzer by connecting it to power and setting up the handle and screen brightness as desired. •...
Page 20 Getting Started Figure 1 Using the Logic Analyzer...
Page 21 Getting Started The high-speed display of the HP 54620A/C can be used to isolate infrequently changing signals. You can then use the characteristics of these signals to help refine the trigger specification. See the figure below. Figure 1A Refining the Trigger Specification...
Page 22: Preparing The Analyzer
Preparing the Analyzer To prepare your logic analyzer for use, you need to do the following: Check to ensure that you received everything that is supplied with the analyzer. Connect the analyzer to power and switch it on. Connect the probe cable to the analyzer and connect probes to the circuit of interest.
Page 23: To Check Package Contents
To check package contents To check package contents • Verify that you received the following items in the HP 54620A/C packaging. See figure 2. If anything is missing, contact your nearest Hewlett-Packard Sales Office. If the shipment was damaged, contact the carrier, then contact the nearest Hewlett-Packard Sales Office.
Page 24 (leads attached; with labels) HP 5959-9334 HP 5090-4356 2" Ground Lead Set (5) Grabber (20) Power Cord HP 54620A/C User's Guide HP 54620A/C (Varies depending on country) HP 54620A/C Programmer's Guide Programmer's Reference pkg-cnts.cdr Items Supplied with the HP 54620A/C Logic Analyzer...
Page 25: To Check Optional Accessories
PC, allowing the user to save and restore setups and capture measurements for further review). Option 001—RS-03 Magnetic Shielding for CRT (HP 54620A only) (not shown in figure 3). Option 1CM—Rackmount kit (allows mounting the HP 54620A/C in an EIA-standard rack). This kit is not shown in figure 3.
Page 26 Getting Started To check optional accessories Figure 3 Optional Accessories for the HP 54620A/C Logic Analyzer...
Page 27: Table 1. Power Cords
Dark Gray 100V * Part number shown for plug is industry identifier for plug only. Number shown for cable is HP part number for complete cable including plug. ** These cords are included in the CSA certification approval for the equipment.
Page 28: To Power-On The Logic Analyzer
To power-on the logic analyzer 1 Connect the power cord to the rear of the The HP 54620A/C power supply HP 54620A/C, then to a suitable ac voltage source. automatically adjusts for input line voltages in the range 100 to 240 VAC. Therefore, you do not need to adjust the input line voltage setting.
Page 29: To Adjust The Handle
Getting Started To adjust the handle To adjust the handle 1 Grasp the handle pivot points on each side of the 2 Without releasing the pivots, swivel the handle to instrument and pull the pivot out until it stops. the desired position. Then release the pivots.
Page 30: To Adjust Display Brightness
To increase display brightness, rotate the brightness control clockwise. The brightness control is at the lower left corner of the display. See figure 4. Figure 4 HP 54620A Brightness Control The "A" model includes a brightness control. There is no brightness control on the HP 54620C.
Page 31: Using Color
Using Color With the HP 54620C color logic analyzer, you can select any of the seven available color palettes to assign colors to channels, cursors, stored waveforms, and text. You can assign each channel one of four waveform colors. The seven color palettes allow additional customization, which allows you to easily distinguish between channel waveforms.
Page 32: To Select The Color Palettes And Observe Colors
Getting Started To select the color palettes and observe colors To select the color palettes and observe colors Press . Look at the softkey. Display Palette The name of the palette appears under the softkey. For example, Default. Press the softkey.
Page 33: Table 2. Color Palettes And Mapping Of Colors To Display Components
Getting Started To select the color palettes and observe colors The following table shows the color palettes and the palette colors mapped to the display components. Table 2 Color Palettes and Mapping of Colors to Display Components Palette Color Display Palette Color Display...
Page 34: To Assign Colors To Channels
Colors Coordinate to Display Activity and Selections When using colors on the HP 54620C color Logic Analyzer, all of the activity for a specific channel, including the channel color assignment softkey, channel waveform, channel activity indicator, and trigger condition indicator (when defined for the same channel) are displayed in the same color on screen.
Page 35: To Print In Color
This selects the HP DeskJet Color Printer format. Set the Destination to Parallel Press . Then press Previous Menu Print Screen The current display will be sent out the parallel port to the HP DeskJet color printer attached to your logic analyzer, and printed in color.
Page 36: Making Measurements
To make measurements using the HP 54620A/C, you set up the instrument using front-panel controls, then read the display results. Learn the front panel The HP 54620A front panel is shown in the following figure. The HP 54620C differs only in that it does not have intensity control. Front-Panel Functions...
Page 37 Getting Started Learn the front panel Figure 6 Display Channel General Horizontal Storage Trigger Controls Controls Controls Keys Keys HP 54620C does not have display Signal Trigger intensity Softkeys Inputs Input / Output HP 54620A Logic Analyzer Front Panel...
Page 38 Label while in the menus that they activate. Control Knobs The HP 54620A has six control knobs. The HP 54620C has five control knobs; it does not have an intensity control knob. • The Time/Div knob changes the current time base setting (sweep speed) of the analyzer in Main or Delayed sweep.
Page 39 Getting Started Learn the front panel Display This figure shows the HP 54620A/C display. Figure 7 Status Channel Sampling Glitch Delay Time/Div Trigger Acquisition Indicators labels interval mode Setting Condition Indicator Channel numbers Waveform display area Memory bar Measurement field...
Page 40 Getting Started Learn the front panel Status Indicators Status indicators include the following: • Channels that are turned off; these are visible only if you select a channel that is off by using the Select knob. • Sampling interval is a function of the Time/Div setting and varies from 2 ns to 8 ms.
Page 41 See chapter 2, “Making Analyzer Measurements,” for more information on using labels. When using the HP 54620C color logic analyzer, you can assign colors to channels using the Label menu. See “Using Color” in this chapter for more information about assigning colors to channels.
Page 42 When several softkeys are displayed with a labeled bar over them, it means that either the softkeys are related or that the choices are mutually exclusive. When using the HP 54620C color logic analyzer color palettes, some channel-specific softkeys display the color assigned to the particular channel.
Page 43: To Probe A Circuit
HP 54620A/C powered on because no voltage appears at the probes. 2 Connect the probe cable to the HP 54620A/C. 3 Connect a grabber to one of the probe leads. The cable is indexed so you can connect it only (Other probe leads are omitted from the figure one way.
Page 44 Getting Started To probe a circuit 6 Connect the ground lead on each set of channels, 7 Repeat steps 3 through 6 until you have using a probe grabber. The ground lead improves connected all test points of interest. signal fidelity to the analyzer, ensuring accurate measurements.
Page 45: To Set Up An Acquisition Using Autoscale
Getting Started To set up an acquisition using Autoscale To set up an acquisition using Autoscale • To configure the analyzer quickly, press Autoscale • To undo the effects of autoscale, press , then press the Setup softkey in the Setup menu. Undo Autoscale •...
Page 46 Run mode (continuous acquisition). The Undo Autoscale function returns the instrument to the setup that existed prior to Autoscale being activated. When using the HP 54620A/C, pressing Autoscale returns the Auto Glitch Detect capability in the Display menu to the enabled status.
Page 47: To Start And Stop An Acquisition
Getting Started To start and stop an acquisition To start and stop an acquisition • To begin an acquisition, press the key. Run/Stop The analyzer begins acquiring data while searching for a trigger condition. The RUN indicator is shown in the upper-right corner of the display. If a trigger occurs, the acquired data is shown in the display.
Page 48: To Define A Simple Edge Trigger
Getting Started To define a simple edge trigger To define a simple edge trigger Press Edge Do one of the following: • Press the softkey under to choose the External Trigger Trg In Source input as the trigger source. • Select a channel as the trigger source using either the Select knob, the Entry knob, or the softkey.
Page 49: To Adjust The Time Base (Sweep Speed)
Main/Delayed menu gives finer increments. Vernier When using the HP 54620A/C, and Auto Glitch Detect is disabled, you can adjust the sweep speed to 2 s/div and 5 s/div. "GL" is not displayed if the logic analyzer Auto Glitch Detect is disabled.
Page 50: To Turn Channels On And Off
Getting Started To turn channels on and off To turn channels on and off • To turn off a specific channel, press , select a channel On/Off using the Select knob, then press the leftmost softkey until highlighted. • To turn on a specific channel, press , select a channel On/Off using the Select knob, then press the leftmost softkey until...
Page 51: To Rearrange The Channels
Getting Started To rearrange the channels To rearrange the channels Turn the Select knob to choose the channel you want to move. Only channels that are currently on may be moved. Turn the Position knob to choose a new location for the selected channel.
Page 52: Making Analyzer Measurements
Making Analyzer Measurements...
Page 53 Making Analyzer Measurements The HP 54620A/C provides a full set of features to help automate your measurement tasks. You can: • Set up the analyzer for different logic thresholds, allowing simultaneous timing measurements on sets of signals from different logic families.
Page 54: Setting Logic Levels
Setting Logic Levels You can adjust the logic threshold levels used by the analyzer for three independent groups of input signals: channels 0-7, channels 8-15, and the external trigger. Because of this, you can make simultaneous measurements on signals from different logic families. For example, you could connect channels 0-7 to TTL signals, channels 8-15 to ECL signals, and the external trigger to an analog signal.
Page 55: To Change The Logic Threshold For Input Signals
Making Analyzer Measurements To change the logic threshold for input signals To change the logic threshold for input signals Press Logic Levels Press the softkey to highlight the range of channels for which you want to set the logic threshold. Ranges available are Chan 0-7 (channels 0 through 7), Chan 8-15 (channels 8 through 15), and TRIG IN (the external trigger input).
Page 56: Controlling Data Acquisition
When Auto Glitch Detect is disabled, the HP 54620A/C acquisition system has a record length of 8K samples at all sweep speeds. In addition, you can extend the sweep speed to 2 s/div and 5 s/div in the Main display mode.
Page 57: To Take A Single Acquisition
Making Analyzer Measurements To take a single acquisition You can detect the presence of aliases in the analyzer’s display simply by selecting a faster sweep speed. If the waveform display changes more than expected, it is an alias being caused by undersampling. Whenever a waveform is being displayed as a solid bar, it is highly likely that when you expand the waveform the display will contain aliases.
Page 58: To Use Auto Glitch Detect
1 µs/div. Preferred Mode of Operation The preferred mode of HP 54620A/C operation is Auto Glitch Detect enabled. However, there might be a situation that requires the use of the instrument’s full 8K memory to capture the waveform of interest.
Page 59: To Accumulate The Results Of Every Acquisition
Instead, for each pixel memory location turned on by a previous acquisition, the analyzer changes the display brightness to half-bright (or to the Autostore color for HP 54620C). Thus, the results of each new acquisition are displayed at full brightness (or to the Autostore color for HP 54620C), and the results of all previous acquisitions are displayed at half brightness.
Page 60: Using Labels
Using Labels The HP 54620A/C allows you to define and assign labels to each input channel. Or, you can turn labels off to increase the waveform display area. In addition, the HP 54620C allows you to assign colors to channels.
Page 61: To Assign A Label To A Channel
Making Analyzer Measurements To assign a label to a channel To assign a label to a channel Press Label Press the softkey. Define Labels The following figure shows the label maker. A label definition menu is shown on the right-hand side of the display. Select the channel for which you want to assign a label using the Select knob.
Page 62 HP 54620A/C Label Definition Display...
Page 63: To Define A New Label
Making Analyzer Measurements To define a new label To define a new label Press Label Press the softkey. Define Labels A label definition menu is shown on the right-hand side of the display. To use an existing label as the basis for the new label, use the Entry knob to choose a label from the list of labels.
Page 64 Making Analyzer Measurements To define a new label Label Assignment Auto-Increment Features When you assign a label ending in a digit, such as ADDR0 or DATA0, the analyzer automatically increments the digit and displays the modified label in the entry field. Then, the analyzer changes the selected channel to the next channel down on the display that is on.
Page 65: To Initialize The Label List
Making Analyzer Measurements To initialize the label list To initialize the label list Press Label Press the softkey. Initialize Label List A message appears, warning you that this operation will overwrite the current label list. • To confirm the operation, press the softkey.
Page 66: Triggering The Analyzer
Triggering the Analyzer The HP 54620A/C allows you to synchronize the analyzer display to the actions of the circuit under test by defining a trigger condition. The analyzer offers three types of triggering, allowing you to match the complexity of the trigger to that of the data you want to capture.
Page 67 Making Analyzer Measurements Trigger types Pattern Trigger In pattern trigger, you define a pattern of highs, lows, and don’t care inputs that must be recognized across the input channels during any given input sample. The pattern may be combined with one edge on any input channel to form the complete trigger specification.
Page 68 Making Analyzer Measurements Trigger types Figure 13 Choose the Set the Clear a level Set one channel channel for required or edge to require a which you will level to high requirement rising or falling set the level or or low for a edge (or either edge required...
Page 69 Making Analyzer Measurements Trigger types Figure 14 Shows the first Shows the Shows the second source selection currently selected source selection (valid source operator only with operators requiring two sources) Shows the current definitions of all pattern and edge terms, and input activity Select Define the...
Page 70 Making Analyzer Measurements Trigger types Figure 15 When the You can select operator is and define a AND, OR, or second source Then... using these softkeys. Advanced Trigger Softkeys for Operators with Two Sources Sharing of Sources The source definitions for the simple pattern trigger are shared with the Pattern 1 and Edge 1 sources of the advanced trigger specification.
Page 71: To Define The Trigger Mode
Making Analyzer Measurements To define the trigger mode To define the trigger mode Press Mode Select the mode using the softkeys. Trigger Mode You can select either Normal mode or Auto mode. Trigger Mode The trigger mode affects the way in which the analyzer searches for the trigger.
Page 72 Making Analyzer Measurements To define the trigger mode The subsequent behavior depends on whether the acquisition was initiated by pressing Single or Run: • Single—the analyzer will fill acquisition memory, stop, and display the results. • Run—the analyzer will fill the pre-trigger buffer after drawing a trace. When the pre-trigger buffer is full, the analyzer repeats the search for a trigger.
Page 73: To Define An Edge Trigger
Making Analyzer Measurements To define an edge trigger To define an edge trigger Press Edge Do one of the following: • Press the softkey under to choose the External Trigger Trg In Source input as the trigger source. • Select a channel as the trigger source using the Select knob, the Entry knob, or the softkey.
Page 74: To Define A Pattern Trigger
Making Analyzer Measurements To define a pattern trigger To define a pattern trigger Press Pattern Do the following for each channel in the desired pattern (including the external trigger input): Select a channel for the external trigger input either by pressing the softkey, or by rotating the Select knob or Entry knob.
Page 75: To Define An Advanced Trigger
Making Analyzer Measurements To define an advanced trigger To define an advanced trigger Press Press the softkey to turn on the trigger overview, if desired. Overview The trigger overview display simplifies the trigger setup by allowing you to see the current source and operator selections and source definitions (pattern and edge definitions).
Page 76: Table 4 Trigger Operators And Sources
Making Analyzer Measurements To define an advanced trigger • To set a channel to don’t care (not part of the trigger specification), press the softkey. Don’t Care • To clear all edge settings, press the softkey. Clear Edge(s) In Edge1, only one edge can be selected. Multiple edges may be selected in Edge2;...
Page 77 The key to setting up a useful waveform display is picking a known sequence of waveform events to which you can apply the advanced trigger capabilities of the HP 54620A/C. To find these events, you can ask a series of questions about the waveform, keeping in mind the capabilities of the analyzer.
Page 78 Making Analyzer Measurements To define an advanced trigger Example Suppose you have a pulse train where one of the pulses is of constant duration (4 µs) and all other signals of interest are repeated with that pulse train. See figure 17. µ...
Page 79 Making Analyzer Measurements To define an advanced trigger Source Operator and Pattern/Edge Parameters Pattern 1 Then L on channels 2, 1, and 0, others don’t care Pattern 2 L on channels 2 and 1, H on channel 0, others don’t care Example Suppose you have a microcontroller-based system that consistently fails the third time you push a particular front-panel switch when a particular system...
Page 80 Making Analyzer Measurements To define an advanced trigger All Qualifiers must be Satisfied to Trigger the Analyzer When setting up an advanced trigger, you must remember that all required events must be satisfied to trigger the analyzer. For example, if you set up an occurrence trigger using Pattern 1 and Edge 1, and the occurrence count is 3, then Edge 1 must be satisfied three times, with the pattern valid each time, before the trigger will occur.
Page 81: Examining The Captured Data
Examining the Captured Data The HP 54620A/C has features to make viewing acquired data easier. These include delayed sweep, the graticule, and printing. Viewing acquired data with delayed sweep Delayed sweep is an analyzer display function that magnifies the contents of sample memory. Using the delayed sweep, you can zoom in on a portion of the waveform and examine it in greater detail.
Page 82 Delayed Sweep Graticule The graticule on the HP 54620A/C has three settings, Full, None, and Frame, allowing you to change the pattern of hash marks on the display. This can make it easier to view or measure waveform events.
Page 83: To Show Both Main And Delayed Sweep Displays
Making Analyzer Measurements To show both main and delayed sweep displays To show both main and delayed sweep displays Press Main/Delayed Press the softkey. Delayed The display is divided into a main and delayed sweep. The delayed sweep is shown in the bottom half and represents the portion of the waveform indicated by the vertical lines outlining a window in the upper half.
Page 84: To Change The Time Reference Position
Making Analyzer Measurements To change the time reference position To change the time reference position Press Main/Delayed Choose the time reference position from the Time Reference softkeys: • To set the time reference so that most of the acquired data follows the trigger, press the softkey.
Page 85 Making Analyzer Measurements To change the time reference position The delay time reference point changes: • For a time reference setting of Left, the delay time is measured from the trigger to the left-hand edge of the delay window (the marker location).
Page 86 Making Analyzer Measurements To change the time reference position Figure 22 shows the same acquisition with the horizontal mode set to Delayed. Again, the time reference is set to Center. Though the marker (the solid triangle ) points to the trigger event in both the main and delayed sweep, the delay values themselves are independently adjustable.
Page 87: To Pan The Display
Making Analyzer Measurements To pan the display To pan the display • Turn the Delay knob. The Delay knob adjusts the amount of time between the trigger event and the time reference point on the display. When the delay value is positive, the time reference point represents the end of the delay time;...
Page 88: To Modify The Graticule
Making Analyzer Measurements To modify the graticule To modify the graticule Press Display Press one of the softkeys to define the graticule used for the Grid waveform area on the display. • has a set of hash marks through the center of the waveform display Full area, with major divisions indicated by a full-height dotted line through the waveform display.
Page 89: To Print The Display
Making Analyzer Measurements To print the display To print the display Press Print/Utility Press Print Screen The current display is copied to the attached printer. You can stop printing by pressing the softkey. Cancel Print See the documentation for the interface module for information on installing and configuring module interface parameters.
Page 90: Measuring Waveform Data
Measuring Waveform Data The HP 54620A/C has three features for measuring waveform parameters: • Cursors • Single-channel measurements • Dual-channel measurements Ways to measure data Cursors The cursors provide a manual way to measure either time between particular points on the display (usually associated with waveform events) or the numeric value of the currently displayed waveforms.
Page 91 Making Analyzer Measurements Ways to measure data Figure 23 shows the cursors used to measure the period of an irregular waveform on channel 4; the period can be read from the ∆t display in the measurement field as 28.50 µs. Figure 23 Cursor t1 Cursor t2...
Page 92 Making Analyzer Measurements Ways to measure data Single-Channel Measurements All five of the single-channel measurements in the HP 54620A/C—period, frequency, duty cycle, positive width, and negative width—are concerned with measuring the time between sets of events on the same channel, then calculating the appropriate values based on the definition of the measurement.
Page 93 Making Analyzer Measurements Ways to measure data Dual-Channel Measurements All three of the dual-channel measurements in the HP 54620A/C— channel-to-channel delay, setup time, and hold time—are concerned with measuring the time between edges on two different channels. Figure 25 shows a channel-to-channel delay measurement. Other dual-channel measurements have similar softkey menus.
Page 94 Making Analyzer Measurements Ways to measure data A glitch is counted as having a rising and a falling edge, so if a glitch appears as the first set of edges on screen, it will be treated as part of the waveform for single-channel measurements.
Page 95: To Use The Cursors
Making Analyzer Measurements To use the cursors To use the cursors Press Cursors Push the softkey to choose which cursor is active. Either t1 or t2 is always active when the cursors are on. To move both cursors simultaneously, press both the t1 and t2 softkeys simultaneously. Set the position of the active cursor using the Entry knob.
Page 96: Table 5. Readout Settings
Making Analyzer Measurements To use the cursors Table 5 Readout Settings Setting Indicator Meaning Application Time Time at cursor t1 with respect to trigger. Measure delta t of waveform events with respect to trigger event, or measure period Time at cursor t2 with respect to trigger. or frequency for irregular waveforms.
Page 97: To Measure Waveform Parameters On A Single Channel
Making Analyzer Measurements To measure waveform parameters on a single channel To measure waveform parameters on a single channel Press Single Channel Select the channel on which you want to make a measurement by using the Entry knob or Select knob, or by pressing the Source softkey.
Page 98 The analyzer will activate the cursors to show which transitions were selected for that measurement. To clear the current measurement results, press the softkey. With the HP 54620C, Clear Meas the tracked measurement results will be displayed in the cursor color.
Page 99: To Measure Channel-To-Channel Delay
Making Analyzer Measurements To measure channel-to-channel delay To measure channel-to-channel delay Channel-to-channel delay is the time between a particular event on one channel and another event on another channel. For example, you might use this measurement to check skew between two signals in your circuit; in this case, you would measure the time between the same event occurring on each channel.
Page 100 Making Analyzer Measurements To measure channel-to-channel delay Press Measure Chan Delay The channel-to-channel delay time appears on the message line of the display. You may repeat the above steps as desired to measure the delay time between different sets of input channels. The three most recent single- or dual-channel measurements (of any kind) will be shown on the message line of the display.
Page 101: To Measure Setup Time
Violating the setup time specification of a device can lead to unstable circuit operation. You can use the Setup Time measurement in the HP 54620A/C to verify that your circuit design meets the device specifications.
Page 102 Making Analyzer Measurements To measure setup time Example The following display shows a setup time measurement, where the data channel is channel 1, and the clock channel is channel 0. Figure 27 Clock transition Data transition Setup Time Measurement...
Page 103: To Measure Hold Time
Violating the hold-time specification of a device can lead to unstable circuit operation. You can use the Hold Time measurement in the HP 54620A/C to verify that your circuit design meets the device specifications.
Page 104 Making Analyzer Measurements To measure hold time Example The following display shows a hold time measurement, where the clock channel is channel 0, and the data channel is channel 1: Figure 28 Clock transition Data transition Hold Time Measurement...
Page 105: Using The Analyzer With Other Instruments
Trigger output Extending trigger capabilities External Trigger Input The external trigger input allows you to trigger the HP 54620A/C from another instrument or another signal in the circuit under test. • In the first case, you may be using the capability of the other instrument to help qualify the trigger condition before triggering the analyzer.
Page 106 Figure 29 shows the first case, where you might trigger the analyzer by using the trigger output of an emulator. Figure 30 shows the second case, using an oscilloscope probe to route the signal to the external trigger input. Figure 29 54620A STORAGE LOGIC ANALYZER 16 CHANNEL 500 MSa/s...
Page 107 Making Analyzer Measurements Extending trigger capabilities Figure 30 54620A STORAGE LOGIC ANALYZER 16 CHANNEL 500 MSa/s Measure time Save/Recall Entry HORIZONTAL TRIGGER Delay CHANNEL Time/Div Select INPUTS Position Trigger out Ext trigger in L i n e Connections for External Trigger using an Oscilloscope Probe The external trigger input can have a logic threshold setting independent of channels 0-15.
Page 108 For example, you might want to use the trigger output to trigger an oscilloscope, or even to trigger another HP 54620A/C for complex problems requiring more channels. The trigger output signal cannot be viewed on the waveform display.
Page 109: To Use The External Trigger Input
To use the external trigger input Connect a signal to the BNC labeled “Ext trigger in.” The “Ext trigger in” BNC is the rightmost one on the HP 54620A/C front panel. It has an input impedance of 1 MΩ and can accept a maximum signal of ±40 V.
Page 110 +60 V; thus, it is too large for the logic inputs or the external trigger input. However, by using a 10:1 divider probe, such as are in the HP 54620A/C, you can safely apply the squarewave to the external trigger input. You can then set the threshold for the external trigger to +3.0 V (60 divided by 2 divided...
Page 111: To Use The Trigger Output
Stop Acquisition to Increase Trigger Output Rate While in Run mode, the HP 54620A/C can only generate trigger outputs as fast as it can acquire the data and update the waveform display. This is normally fast enough to trigger digital oscilloscopes. However, it is not fast enough to ensure a usable display for analog oscilloscopes.
Page 112: Saving And Recalling The Configuration
Saving and Recalling the Configuration The HP 54620A/C allows you to save a visual record of measurement results (trace memory) and instrument configurations (setup memory). Using memories to save and recall configurations Trace memory Two trace memories, also called pixel memories, are available in the HP 54620A/C.
Page 113 Trace Memory Save/Recall Setup memory The HP 54620A/C has 16 separate setup memories that allow you to save the current configuration of the instrument, including time base, threshold, channel settings, measurement definitions, and labels (but not as 16 independent label lists). These memories are non-volatile. They are best used for saving instrument configurations that you need later to verify the results of a change, or need regularly for test and troubleshooting.
Page 114 Making Analyzer Measurements Using memories to save and recall configurations The current acquisition results are not saved in the setup memory. To save acquisition results for later review and comparison, use the trace memory. Figure 34 shows the setup memory softkey menu. Figure 34 Choose Reverse the...
Page 115: To Save A Trace Waveform
Making Analyzer Measurements To save a trace waveform To save a trace waveform Press Trace Press the softkey to choose either Trace Mem1 Mem2 correspond to the two pixel memories where you can save the Mem1 Mem2 waveform. Press to save the currently displayed waveform. Save to Mem will appear as either Save to Mem...
Page 116: To Recall A Trace Waveform
Making Analyzer Measurements To recall a trace waveform To recall a trace waveform Press Trace Press the softkey to choose either Trace Mem1 Mem2 correspond to the two pixel memories in which a waveform Mem1 Mem2 might have been saved. Recall the contents of pixel memory: •...
Page 117: To Clear A Previously Saved Trace
Making Analyzer Measurements To clear a previously saved trace To clear a previously saved trace Press Trace Press the softkey to choose either Trace Mem1 Mem2 correspond to the two pixel memories in which a waveform Mem1 Mem2 might have been saved. Press the softkey.
Page 118: To Save The Instrument Setup
Making Analyzer Measurements To save the instrument setup To save the instrument setup Press Setup Select the setup memory using the Entry knob. Toggle the leftmost key under the banner. Setup Memory You can store and recall sixteen different setups, numbered 1 through 16. Press the softkey.
Page 119: To Recall The Instrument Setup
Making Analyzer Measurements To recall the instrument setup To recall the instrument setup Press Setup Select the setup memory using the Entry knob. Toggle the leftmost key under the banner. Setup Memory You can store and recall sixteen different setups. Press the softkey.
Page 120: To Reset The Instrument Setup
Pattern 1 and 2 mask and value is 0, minimum duration 2 samples. Edge 1 and 2 rising on channel 0, occurrence count 1. Auto Glitch Detect Enabled. Waveform Colors Channels 0-3 - yellow, 4-7 - magenta, 8-11 - cyan, and 12-15 - red. (HP 54620C only)
Page 122: Solving Problems
Solving Problems...
Page 123 Solving Problems This chapter describes possible solutions if you encounter problems while making measurements with the instrument. If you need to verify instrument functionality and performance, refer to chapter 5, “Testing, Adjusting, and Troubleshooting the Analyzer.”...
Page 124: If There Is No Trace Display
If there is no trace display If there is no trace display Check that the power cord is connected to the HP 54620A/C and to a live power source. Check that the front-panel power switch is set to 1 (on).
Page 125: If The Trace Display Is Unusual Or Unexpected
Solving Problems If the trace display is unusual or unexpected If the trace display is unusual or unexpected Check that the Time/Div setting is correct for the expected frequency range of the input signals. The sampling speed of the analyzer depends on the Time/Div setting. Thus, when the Time/Div setting is slower than 1 µs/div, the analyzer may be sampling too slowly to capture all the transitions on the waveform.
Page 126: If You Can't See A Channel
Solving Problems If you can’t see a channel If you can’t see a channel Check that the analyzer probe cable is securely connected to the input connector. The key on the probe cable should be facing down. Check that the analyzer probe lead wires are securely inserted into the connector assembly and that the grabbers make good contact with the probe lead wires.
Page 128 Ensuring Accurate Measurements...
Page 129 Ensuring Accurate Measurements This chapter gives an overview of some analyzer concepts that will help you make better measurements. It discusses the relationship between the time base setting and other time-dependent analyzer functions, explains how to achieve the most accurate signal fidelity through good probing practices, and describes how glitch detection works.
Page 130: Ensuring Accurate Measurements Time Base And Acquisition
The interval at which the input is sampled is called the sample period. Because there is a finite amount of acquisition memory in the HP 54620A/C, the instrument is optimized to deliver the smallest sample period possible, while still acquiring enough data to provide at least a full screen of waveform at any Time/Div (or time base) setting.
Page 131: Table 7. Sweep Speed And Sampling Interval
Ensuring Accurate Measurements Time base and Acquisition The following table shows how the sampling intervals vary with sweep speed when Auto Glitch Detect is enabled and disabled. The vernier function is off. Table 7 Sweep Speed and Sampling Interval Auto Glitch Detect Auto Glitch Detect Auto Glitch Detect Enabled...
Page 132 Ensuring Accurate Measurements Time base and Acquisition Figure 36 Acquisition Memory Normal Mode In Normal trigger mode, the analyzer behaves the same when the acquisition was initiated by pressing either Run or Single. The analyzer begins filling the pre-trigger buffer with data. As soon as that buffer is full, the analyzer will begin searching for the trigger event, and will flash the trigger condition indicator.
Page 133 Ensuring Accurate Measurements Time base and Acquisition Some measurements you want to make will require you to take some action in the circuit under test to cause the trigger event. Usually, these are single-shot acquisitions, where you will use the Single key. If you use Normal mode and wait for the trigger condition indicator to flash before causing the action in the circuit, the analyzer will always find the trigger condition correctly.
Page 134 Ensuring Accurate Measurements Time base and Acquisition The minimum duration trigger setting is two sample periods or 16 ns, whichever is greater. And, the resolution of the duration trigger is one sample period. How might this affect your measurement? Suppose you have the sweep speed set to 2 µs/div, and have a duration trigger set up for duration >...
Page 135 Ensuring Accurate Measurements Time base and Acquisition The time reference position sets the general location of the trigger event within acquisition memory. A time reference position of Left sets the event to a few locations after the beginning of acquisition memory, Center sets the event to the middle of acquisition memory, and Right sets the event to a few locations before the end of acquisition memory.
Page 136 Ensuring Accurate Measurements Time base and Acquisition In the previous figure, the trigger point is off-screen to the left—that is why the solid triangle is at the left edge of the graticule. If you now pan the display back by setting the delay to 20 µs, the result looks like the following: Figure 39 Here is the trigger point...
Page 137 Ensuring Accurate Measurements Time base and Acquisition The range of available delay is different with negative delay values. Suppose you set the time reference to Right, at a sweep speed of 5 ms, with a delay value of -80 µs, and you perform a single acquisition. The display would look like the following: Figure 40 The time reference...
Page 138 Ensuring Accurate Measurements Time base and Acquisition The trigger point is off-screen to the right—that is why the solid triangle is at the right edge of the graticule. If you now stop and pan the display back by setting the delay to 0 µs, the result looks like the following: Figure 41 Panning the Display to View the Trigger Point Here, the trigger point is in memory.
Page 139 Ensuring Accurate Measurements Time base and Acquisition Varying the Time/Div Setting When you vary the Time/Div setting during Run mode, remember that the sample period is also being adjusted. If, for example, you rapidly change the Time/Div setting to a higher value (slower sweep speed), the sample period is also lengthened, and it will take longer to fill acquisition memory.
Page 140: Probing The Circuit Under Test
Probing the Circuit Under Test Probing the Circuit Under Test You may encounter problems during your use of the HP 54620A/C that are related to probing. These problems fall into two categories: probe loading and probe grounding. Probe loading problems generally affect the circuit under test, while probe grounding problems affect the accuracy of the data to the measurement instrument.
Page 141 Ω Impedance versus Frequency for Both Probe Circuit Models The HP 54620A/C probes are represented by the high-frequency circuit model shown in figure 43. They are designed to provide as much series tip resistance as possible. Stray tip capacitance to ground is minimized by the proper mechanical design of the probe tip assembly.
Page 142 Ensuring Accurate Measurements Probing the Circuit Under Test Probe Grounding A probe ground is the low-impedance path for current to return to the source from the probe. Increased length in this path will, at high frequencies, create large common mode voltages at the probe input. The voltage generated behaves according to the equation: V = L Increasing the ground inductance (L), increasing the current (di) or...
Page 143 Ensuring Accurate Measurements Probing the Circuit Under Test Best Probing Practices Because of the variables L, di, and dt, you may be unsure how much margin is available in your measurement setup. The following are guidelines for good probing practices: •...
Page 144: Glitch Detection
In digital system design, a glitch is an unintentional or unexpected signal transition, which may or may not pass through the logic threshold. The HP 54620A/C Logic Analyzer provides support for capturing glitches during acquisition. However, because the analyzer cannot determine whether the transition was valid, it defines the concept of a glitch differently.
Page 145 Ensuring Accurate Measurements Glitch Detection If several transitions occur between samples, the analyzer displays only one glitch. Also, when multiple samples are mapped to a single display pixel—which is often the case—a display in category 2 or 4 will be the likely result, if any glitches occurred between those samples.
Page 146 The HP 54620A/C glitch capture circuitry helps prevent aliasing by identifying additional transitions that occur between samples (for the HP 54620A/C, this is true when Auto Glitch Detect is on; when it is disabled, aliasing occurs). Figure 48 shows how the logic analyzer would reconstruct the waveform from figure 47, given the same sampling rate.
Page 147 Ensuring Accurate Measurements Glitch Detection Figure 49 Here, most edges are disjoint because the sampling rate is too low Glitch Disjoint edges Waveform Display with Sampling Rate Too Low...
Page 148 Ensuring Accurate Measurements Glitch Detection Figure 50 shows the same waveform, this time captured at a much faster sweep speed and corresponding sampling rate. Notice that both the main and delayed sweeps show the waveform as a clearly defined series of pulses and that the disjoint waveform display has disappeared.
Page 149 Ensuring Accurate Measurements Glitch Detection Another way to approach the choice of sampling rate is to consider the amount of margin designed into your system. Consider the following figure, which shows a composite data output from a state machine in relation to the system clock.
Page 150: Testing, Adjusting, And Troubleshooting The Analyzer
Testing, Adjusting, and Troubleshooting the Analyzer...
Page 151 Testing, Adjusting, and Troubleshooting the Analyzer This chapter explains the general procedures for verifying correct analyzer operation, adjusting the analyzer display and power supply, correcting malfunctions in the analyzer, and performing tests to ensure that the analyzer meets performance specifications.
Page 152: Testing The Analyzer
Testing the Analyzer Hazardous voltages are on the CRT, power supply, and display sweep board. W A R N I N G To avoid electrical shock, disconnect the power cord from the logic analyzer. Wait at least three minutes for the capacitors in the logic analyzer to discharge before you begin disassembling the logic analyzer.
Page 153: To Perform Self-Tests
If either of these tests fail, it is likely that the system board is defective. See chapter 6, “Replaceable Parts,” for instructions on replacing the board. If your HP 54620A/C is under warranty, or you want to have HP perform the repair, contact your local Hewlett-Packard Sales Office.
Page 154: To Test The Keyboard
HP perform the repair, contact your local Hewlett-Packard Sales Office. Keyboard Tests when using HP 54652B and HP 54659B Modules When using the HP 54652 and HP 54659 "B-series" modules, you must press the Service Menu softkey after Utility to enter the keyboard tests.
Page 155: To Test The Display
Hewlett-Packard Sales Office. Display Tests when using HP 54652B and HP 54659B Modules When using the HP 54652 and HP 54659 "B-series" modules, you must press the Service Menu softkey after Utility to enter the display tests. To test the acquisition system Testing the acquisition system does not check a specification, but does provide confidence that the system is functioning correctly.
Page 156: Building Test Accessories
Building Test Accessories To completely test and troubleshoot the analyzer, you will need to fabricate two test accessories: • The test connectors make it easy to hook the analyzer probes to function generators and measurement equipment with minimum electrical distortion. These connectors are used in the threshold and time interval tests.
Page 157: To Make The Test Connectors
The test connectors connect the logic analyzer to the test equipment. Table 8 Materials Required Description Recommended Part BNC (f) Connector HP 1250-1032 Berg Strip, 8-by-2 Berg Strip, 1-by-2 100 Ω 1% resistor HP 0698-7212 Jumper wire Build the first test connector using a BNC connector and an 8-by-2 section of Berg strip.
Page 158 Testing, Adjusting, and Troubleshooting the Analyzer To make the test connectors Build the second test connector using a BNC connector and a 1-by-2 section of Berg strip. Solder two resistors to the Berg strip, in parallel across the two pins. Solder the center of the BNC connector to the center pin of one row on the Berg strip.
Page 159: To Make The Dummy Load
You can build the dummy load for the power supply, or purchase it from Hewlett-Packard using HP P/N 54600-66504. HP 54600-66504 consists of a cable, HP P/N 8120-1506, and a test connector, HP P/N 1251-6981. Obtain a connector compatible with the connector on the LVPS.
Page 160: Adjusting The Logic Analyzer
Adjusting the Logic Analyzer This section explains how to adjust the logic analyzer so that it is at optimum operating performance. You need to perform the adjustments every 24 months or 4000 hours of operation. Make sure you allow the logic analyzer to warm up for at least 30 minutes before you start the adjustments.
Page 161: To Adjust The Power Supply
Equipment Critical specifications Recommended Model/Part Digital multimeter 0.1 mV resolution, accuracy HP 34401A ±0.05% Set up the logic analyzer for the voltage adjustment. Turn off the logic analyzer. Remove the cover from the logic analyzer. See chapter 6, “Replaceable Parts,” for disassembly procedures.
Page 162 Testing, Adjusting, and Troubleshooting the Analyzer To adjust the power supply Measure the power supply voltages at L1, L2, and L3 on the system board. Make sure that the voltage measurements are within the following tolerances. +5.1 V ±150 mV (+4.95 V to +5.25 V) +15.75 V ±787 mV (+14.96 V to +16.54 V) −...
Page 163: To Adjust The Display (Hp 54620A Only)
Self Tst Menu Display Print/Utility If the HP 54620C display test fails, you must replace the display. See "To test the display" in this chapter. Adjust V.HO (vertical hold) for vertical synchronization. Set the intensity control (on the front panel) to mid-range.
Page 164 Testing, Adjusting, and Troubleshooting the Analyzer To adjust the display (HP 54620A only) Adjust Sub Bri (sub bright) to the lowest setting so that the half-bright blocks on the display are visible. Increase the intensity control to a comfortable viewing level.
Page 165: Troubleshooting The Logic Analyzer
The following equipment is needed to troubleshoot the logic analyzer. Table 11 Equipment Required Equipment Critical specifications Recommended model/part Digital multimeter 1 mV resolution, accuracy HP 34401A ±0.05% Oscilloscope 100 MHz HP 54600 Probe 10:1 division ratio HP 10071A Dummy load...
Page 166: To Troubleshoot The Logic Analyzer
Connect the power cord, then turn on the logic analyzer. If the display comes on after a few seconds, (HP logo and copyright text, followed by a graticule with text at top of the display) go to “To check the LVPS.”...
Page 167: Table 12 Display Signals
Testing, Adjusting, and Troubleshooting the Analyzer To troubleshoot the logic analyzer Disconnect the display cable, then check the following signals on the system board, using an oscilloscope. Table 12 Display Signals HP 54620A Logic Analyzer Signal Frequency Pulse width Voltage 38.0 µs U3 Pin 7 19.72 kHz...
Page 168 Testing, Adjusting, and Troubleshooting the Analyzer To troubleshoot the logic analyzer Is the fan running? If yes, go to “To perform self-tests.” If not, do the steps below. The LVPS has a thermal cut-out circuit. If the fan is defective, the LVPS shuts down when it gets too hot for safe operation.
Page 169: To Check The Lvps
Testing, Adjusting, and Troubleshooting the Analyzer To check the LVPS To check the LVPS Disconnect the power cord, then set the logic analyzer on its side. Connect the negative lead of the multimeter to a ground point on the logic analyzer. Connect the power cord and turn on the logic analyzer. Measure the power supply voltages at L1, L2, and L3 on the system board, using a voltmeter.
Page 170: Testing Threshold Accuracy
Critical Specifications Recommended Model/Part Digital Multimeter 0.1 mV resolution, 0.005% HP 34401A accuracy DC offset voltage ±6.3 V Function Generator HP 3325B Option 002 BNC-Banana Cable HP 11001-60001 BNC Tee HP 1250-0781 BNC Cable HP 10503A BNC Test Connector, 8-by-2...
Page 171: Step 1. To Set Up The Equipment
Testing, Adjusting, and Troubleshooting the Analyzer Step 1. To set up the equipment Step 1. To set up the equipment Turn on the test equipment and the logic analyzer. Let them warm up for 30 minutes before beginning the test. Set up the function generator.
Page 172: Step 2. To Connect The Logic Analyzer
Using a BNC-banana cable, connect the voltmeter to the other side of the BNC Tee. Connect the BNC Tee to the Main Signal output of the function generator. Figure 56 54620A STORAGE LOGIC ANALYZER 16 CHANNEL 500 MSa/s Measure time...
Page 173: Step 3. To Test The Thresholds
Testing, Adjusting, and Troubleshooting the Analyzer Step 3. To test the thresholds Step 3. To test the thresholds Press . Select , under the softkey, Chan 0-7 Logic levels then select the softkey under User Logic Thresholds For each of the threshold levels shown in the following table, take the following steps: Use the Entry knob on the logic analyzer to select the threshold voltage shown in the table.
Page 174: Testing Time Interval Accuracy
Rise time < 10 ns; device Tektronix TG 501A or under test error is indicated equivalent to within one least significant digit Oscilloscope 100 MHz bandwidth HP 54600 BNC Tee HP 1250-0781 BNC Cable (Qty 2) HP 10503A BNC Test Connector,...
Page 175: Step 1. To Connect The Logic Analyzer
Using a second BNC cable, connect the oscilloscope to the other side of the BNC Tee. Connect the BNC Tee to the Mark output of the time mark generator. Figure 57 TG 501A HP 54600 (or equivalent) 54602A 54620A STORAGE...
Page 176: Step 2. To Set Up The Equipment
Press on the oscilloscope. Autoscale If you are not using an HP 54600-Series oscilloscope, adjust the oscilloscope to achieve the best waveform display. Measure the high and low output levels (in dc volts) of the mark generator by reading them from the oscilloscope display.
Page 177: Step 3. To Set Up The Logic Analyzer
Testing, Adjusting, and Troubleshooting the Analyzer Step 3. To set up the logic analyzer Step 3. To set up the logic analyzer Press Autoscale Press Logic levels Press the softkey to select Chan 0-7 Press the softkey, then use the Entry knob to set the threshold User voltage to the 50% level of the mark generator pulse, based on the voltages you measured previously.
Page 178: Step 4. To Make The Measurement
Testing, Adjusting, and Troubleshooting the Analyzer Step 4. To make the measurement Step 4. To make the measurement Press Single channel Press Period The mark period should be 100 ns ± 2 ns. Record the results in the Performance Test Record.
Page 179 Performance Test Record HP 54620A/C __________ Serial No.______________________ Work Order No.___________________ Recommended Test Interval - 2 Years/4000 hours Date___________________ Recommended next testing___________________ Temperature___________________ Test Settings Results ± (100 mV + 3% of Threshold Accuracy threshold setting) Limits Ch. 0-7 Ch. 8-15 Ext.
Page 180: Replaceable Parts
Replaceable Parts...
Page 181 Replaceable Parts This chapter contains instructions for removing and ordering replaceable assemblies. Also in this section is a parts list for the assemblies and hardware of the logic analyzer that you can order from Hewlett-Packard. If you need a component for one of the printed circuit boards, refer to the parts list included with the component information packet for this logic analyzer.
Page 182: Removing And Replacing Assemblies
Removing and Replacing Assemblies Hazardous voltages are on the CRT, power supply, and display sweep board. W A R N I N G To avoid electrical shock, disconnect the power cord from the logic analyzer. Wait at least three minutes for the capacitors in the logic analyzer to discharge before you begin disassembling the logic analyzer.
Page 183: To Remove The Cabinet
Replaceable Parts To remove the cabinet To remove the cabinet Turn off the logic analyzer and disconnect the power cable. If a module is installed, remove it from the logic analyzer. Using the T15 TORX driver, remove the two screws from the rear of the cabinet.
Page 184: To Remove The Fan
Replaceable Parts To remove the fan To remove the fan Disconnect the fan cable from the power supply board. Using the T15 TORX driver, remove the three screws that hold the fan to the deck.
Page 185: To Remove The Front Panel
Replaceable Parts To remove the front panel To remove the front panel Remove the intensity knob by pulling straight out. Disconnect the keyboard ribbon cable from the system board. Use a screwdriver to release retainer tab A, and your finger to release retainer tab B.
Page 186: To Remove The Display
Replaceable Parts To remove the display To remove the display Remove the front panel on the HP 54620A/C. Disconnect the ribbon cable and the calibration cable from the display. Using the T10 TORX driver, remove the two screws that hold the display to the deck.
Page 187: To Remove The System Board
Replaceable Parts To remove the system board To remove the system board Using the T10 TORX driver, remove the eight screws that hold the system board to the deck. Remove the two screws from the rear-panel interface connector. Disconnect the three ribbon cables and the calibration cable. As you remove the system board, rotate the system board so that the BNCs clear the front panel.
Page 188: To Remove The Power Supply
Replaceable Parts To remove the power supply To remove the power supply Remove the fan. Disconnect the ground wire (green wire with the yellow stripe) from the deck. Disconnect the ribbon cable from the power supply board. Use a screw driver to gently unhook the latch that holds the white shaft to the power switch, then disconnect the shaft from the power switch.
Page 189: To Remove The Keyboard
Replaceable Parts To remove the keyboard To remove the keyboard Remove the front panel. Remove all the knobs by pulling straight out. Flex the bezel of the front panel to unsnap the small keyboard under the display opening. Using the T10 TORX driver, remove the three screws from the large keyboard.
Page 190: To Remove The Handle
Replaceable Parts To remove the handle 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 logic analyzer), then pull the sides of the handle out of the cabinet.
Page 191: Replaceable Parts
Replaceable Parts The system board is part of an exchange program with Hewlett-Packard. The exchange program allows you to exchange a faulty assembly with one that has been repaired and performance verified by Hewlett-Packard. After you receive the exchange assembly, return the defective assembly to Hewlett-Packard.
Page 192: To Order A Replacement Part
Within the USA, Hewlett-Packard can supply parts through a direct mail order system. The advantages to the system are direct ordering and shipment from the HP Parts Center in Mountain View, California. There is no maximum or minimum on any mail order. (There is a minimum amount for parts ordered through a local Hewlett-Packard Sales Office when the orders require billing and invoicing.) Transportation costs are prepaid (there is a...
Page 193 Replaceable Parts To order a replacement part Figure 60 Exploded View of Logic Analyzer...
Page 194: Table 16 Hp 54620A/C Replaceable Parts
Replaceable Parts To order a replacement part Table 16 HP 54620A/C Replaceable Parts Reference HP Part Description Designator Number 0950-2125 Power supply assembly A2 (HP 54620A) 2090-0316 Display assembly A2 (HP 54620C) 54620-68801 Display assembly A2 (HP 54620C) 54620-69801 Exchange display assembly...
Page 195 8120-4600 Power cord option 917, Africa 8120-4754 Power cord option 918, Japan 54620-61602 Display Cable (HP 54620C) 54620-61603 Power Supply Cable (HP 54620C) Option 101 Accessory pouch and front-panel cover (also orderable as HP P/N 54600-68701) 5041-9482 Pouch 54601-44101 Front-panel cover...
Page 196: Performance Characteristics
Performance Characteristics...
Page 197 Performance Characteristics This chapter lists the operating characteristics and performance specifications for the HP 54620A/C Logic Analyzer.
Page 198: Table 17 Input Channels
Table 17 Input channels Number of Channels 16, numbered 0-15. Channel input cable HP 54620-61801 with channels grouped in two sets of 8. Instrument is compatible with 16-channel HP 1650-61607 cable and accessories. ~100 k Ω and 8 pF. Input R&C ±...
Page 199: Table 18 Horizontal System
Performance Characteristics Table 18 Horizontal System Sweep Speeds 1 s/div to 5 ns/div, Main and Delayed Sweep. When Auto Glitch Detect is disabled, in the Main display mode, you can set the sweep speed to 2 s/div and 5 s/div. Accuracy 0.01% of reading;...
Page 200: Table 19 Acquisition System
Performance Characteristics Table 19 Acquisition System Maximum Sample Rate 500 MSa/s. Resolution Single bit. Simultaneous Channels Record Length 2K Samples at sampling periods of 8 ns and slower ( sweep speeds of 1 µS/div to 1 S/div). 8K samples at sampling periods of 2 ns and 4 ns (sweep speeds of 5 nS/div to 500 nS/div).
Page 201: Table 20 Trigger System
Performance Characteristics Table 20 Trigger System General Sources All Channels & External. Auto/Normal Operation Auto will produce a free-running display if the trigger is not found. Normal causes the analyzer to wait indefinitely for a trigger to start acquiring data. Modes Edge, Pattern, and Advanced.
Page 202 ± Sample period + 10 ppm. Jitter ≅ 2 kHz (HP 54620A), ≅ 1.5 kHz (HP 54620C) with the Maximum Output Rate analyzer stopped, 20/sec running. Performance specification, tested by threshold test. See Chapter 5, “Testing, Adjusting, and Troubleshooting...
Page 203: Table 21 Display System
Display System Display 7" Raster CRT (HP 54620A) 5.8" Active Matrix Color LCD Display (HP 54620C) The present state-of-the-art for the color displays allows for some pixel defects to be present. The number of these allowed is no more than six active (those which cannot be turned off), and six inactive (those which cannot be turned on).
Page 204: Table 23 Setup Functions
Each channel may be assigned one to four waveform colors. Colors can be used to group related channels and/or distinguish unique channels. Probe Calibrator Amplitude 5.0 V, Frequency 9.8 kHz (HP 54620A). Amplitude 5.0 V, Frequency 8.3 kHz (HP 54620C). Table 24 Power Requirements Voltage selection Automatic.
Page 205: Table 25 General Characteristics For Hp 54620A Only
Performance Characteristics Table 25 General Characteristics for HP 54620A Only These general characteristics apply to the HP 54620A only. Environmental Meets the requirements of MIL-T-28800E for Type III, Class 3, Style D Characteristics equipment as described below. Ambient Operating: –10°C to +55°C.
Page 206: Table 26 General Characteristics For Hp 54620A And Hp 54620C
Size Height 172.7 mm (6.8"), Width 322.6 mm (12.7"), Depth 317.5 mm (12.5"). Weight 6.8 Kg or 15 LB (HP 54620A), 5.1 Kg or 11.3 LB (HP 54620C). Safety Self-certified to IEC 348/HD401, UL 1244, CSA-C22.2 No. 231 (Series M-89).
Page 207: Table 27 General Characteristics For Hp 54620C Only
Performance Characteristics Table 27 General Characteristics for HP 54620C Only These general characteristics apply to the HP 54620C only. Environmental These instruments meet Hewlett-Packard’s environmental Conditions specifications (section 750) for class B-1 products. Temperature Operating: 0°C to +55°C (+32°F to +131°F).
Page 208 Messages...
Page 209 Messages This chapter presents the various messages displayed by the instrument, explains what they mean, and gives instructions for corrective action if necessary.
Page 210: Messages
A processing fault occurred during operation. Cycle power to the analyzer, or perform a hard reset by cycling power with the two rightmost softkeys depressed. If this does not correct the problem, contact your HP Sales Office for assistance. Are you REALLY Sure?? Overwrite ALL 75 labels, YES to proceed This message appears when you press Yes to confirm initialization of the label list.
Page 211 Illegal Instruction A processing fault occurred during operation. Cycle power to the analyzer, or perform a hard reset by cycling power with the two rightmost softkeys depressed. If this does not correct the problem, contact your HP Sales Office for assistance.
Page 212 No printer interface installed You selected Print Screen from the Print/Utility menu. However, there is no printer interface module installed. You must install an HP interface module (Centronics, HP-IB, or RS-232, as appropriate) for the analyzer to connect to the printer.
Page 213 • Epson if an Epson-compatible printer is connected. • HP Plot if an HP plotter or plotter compatible with HP-GL is connected. (Some HP printers with the HP-PCL V language will also work with this setting.) Occurrence count at limit The count for occurrences of an edge in the Advanced Trigger menu must be set to a value between 1 and 1048575 inclusive.
Page 214 • Check that the printer is turned on and has paper. • Check that the interface module for the HP 54620A/C is connected to the printer and that the correct interface type is being used. Printing done This message appears when the analyzer has finished copying the screen to the printer.
Page 215 Messages Selected channel at top of screen This message appears when you turn the Move knob clockwise and the selected channel is already at the top of the display. Setup recalled This message appears after the analyzer restores the configuration from the specified memory location.
Page 216 Messages This message appears when you press the Clear Mem softkey for either Memory 1 or Memory 2 while in the Trace memory menu. It confirms that the selected memory was cleared.
Page 218: Glossary
Glossary Acquisition is the process by best used when the events you want which the logic analyzer collects to capture are defined by a complex data. The analyzer acquires data by series of waveform events in the sys- sampling the voltage on each input tem, and neither pattern mode nor channel and comparing it to the edge mode are capable of clearly re-...
Page 219 Glossary including setting the time base and Data channel is the channel for thresholds and displaying waveforms which you want to measure setup or for channels connected to active sig- hold time. nals. Delay time in Main sweep is the Autostore records the result of time between the current trigger and every acquisition on the display in...
Page 220 Glossary Duration is the time or signal qualifier is satisfied as soon as the in- width measured using advanced trig- put waveforms have transitioned ger. In an advanced trigger, you can from a state that does not match the set the minimum duration by press- pattern to a state that does match ing a softkey.
Page 221 Glossary ing glitch pulses, the analyzer auto- next channel. The label generator matically enables glitch capture once also allows you to assign colors to the time/div setting is 1 µs/div or channels. slower. In glitch capture mode, the Measurement algorithms are analyzer uses memory resources to used to calculate input frequency, in- record an event where at least two...
Page 222 Palettes include colors that you stant value plus one sample period. can assign to channels with the HP 54620C color logic analyzer. Six Minimum duration trigger setting color palettes are available, and are specifies the shortest duration set-...
Page 223 Print copies the current display to of the clock occurs. Violating the the attached printer. You must have setup time specification of a device either an HP-IB, RS-232, or Centron- can lead to unstable circuit opera- tion. ics/parallel Interface module to use the print capability.
Page 224 Glossary Softkeys set up various options Sweep speed (time base) is the for major functions. The softkeys amount of time per division on the change depending on the function display, and is shown on the status you select. Some softkeys have an line.
Page 225 Glossary Trigger mode can be set to Nor- Width refers to positive and nega- mal or Auto. See “Normal trigger tive duration of a signal. The signal mode” or “Auto trigger mode.” width can be measured using single- channel measurements. In doing so, Trigger output is an output signal the analyzer measures the time be- used to trigger an external measure-...
Page 226: Index
Index activity indicators does not display ringing, 141 accessories for threshold test, 172 enables glitch capture, 143–148 build for testing, 155 adjusting fan running?, 167 optional, 24–26 delay, 93 See logic analyzer supplied, 22–23 display brightness, 29 measurement function concepts, 137 accumulating results, 58 handle, 28 measurement process, 92...
Page 227 Index ordering, 191–194 boards capturing single-shot events, 56 removing and replacing, 181 power supply, 161 carrying case, 24–26 replacing on exchange program, 190 removing the system board, 186 center assigning colors to channels, 33 replaceable parts, 180 time reference displayed, 84 assigning labels, 60–63 training, 25 time reference position, 83–85...
Page 228 Index circuit ground probe grounding, 140 connecting to analyzer, 42–43 probing circuit under test, 139–142 damage to analyzer circuit signals probing practices, 142 power down before servicing, 164 associating with channel, 40 storage of samples, 130 damaged shipment, 22–26 associating with input channels, 59 time reference, 133 data circuit under test...
Page 229 Index delayed sweep window dual-channel measurements, 98–99 equipment edges used for measurement, 93 channel-to-channel delay, 92 for servicing analyzer, 164 indicator for, 81 hold time, 92 for testing threshold accuracy, 169 Time/div setting for, 81 setup time, 92 for testing time interval accuracy, 173 delayed window where displayed, 41 set up to test threshold accuracy, 170...
Page 230 158 irregular patterns connecting to probe lead, 42–43 policy for replacing assemblies, 164 use cursors to measure, 97 part number for, 22–23 HP-IB Interface module, 111 graticule, 40 modifying settings, 87 preset configuration, 119 keyboard immediate-action keys, 41...
Page 231 Index keys logic analyzer markers action, 37 accessories supplied with, 22–23 for delayed sweep window, 81 function of, 37 See analyzer for trigger position, 84 menu, 37 Benchlink for Microsoft Windows, 24–26 material list, 22–23 softkeys, 37 carrying case for, 24–26 materials configuring with Autoscale, 44–45 for making test connectors, 156–157...
Page 232 Index measuring waveform data pan the waveform, 80, 86 time between edges, 92 names concepts of delayed sweep, 133 using cursors, 89 assigning to channels, 60–61 concepts of memory bar, 132 using dual-channel, 92 defining, 62–63 parameters using single-channel, 91 naming for trigger operator, 74–79 memory...
Page 233 142 for setup time measurement, 100 blown fuse, 168 problems relating channels and circuit signals, 40 hazardous voltages, 181 obtain HP service, 123 relationship between key color and location of adjustments, 161 solving, 122 function, 37 making dummy load, 158 trace display, 123–124...
Page 234 Index removing risetime in voltage model, 141 sequential output patterns and replacing assemblies, 181 ROM and RAM self-tests, 151–152 triggering on, 77 cabinet, 182 RS-232 Interface module, 111 setting display, 185 Run, 46 cursor position, 91 fan, 183 and auto trigger, 71, 131 DC offset for threshold test, 172 front panel, 184 and Erase, 58...
Page 235 Index single-channel measurements, 94–97 Stop, 46 test setup calculation and values, 91 stop printing, 88 for thresholds, 171 softkeys displayed, 91 stopping an acquisition, 46 for time interval accuracy, 174 where displayed, 41 to increase trigger output rate, 107, 110 test thresholds, 172 single-shot acquisition, 56, 71, 132 storage, 56...
Page 236 Index time reference concepts, 133 triangle indicators trigger output rate time reference indicator, 39 empty(trigger delay), 84 affected by overhead, 110 displayed, 84 solid (trigger position), 84 increase, 110 time reference position trigger, 65 trigger position concepts, 133 action to cause, 71, 132 indicators displayed, 84 Time/div, 39 advanced, 67, 74–79...
Page 237 Index vertical hold waveform events adjusting, 162–163 and pattern trigger, 66 vertical lines apply advanced trigger, 76 in delayed sweep display, 82 measuring time or values, 89 viewing acquired data picking known sequence, 76 delayed sweep, 80 questions to find sequence, 76 graticule, 81 setting up display, 76 printing, 81...
Page 238: Declaration Of Conformity
1900 Garden of the Gods Road Colorado Springs, CO 80907 U.S.A. declares, that the product Product Name: Logic Analyzer Model Number(s): HP 54620A/C Product Option(s): conforms to the following Product Specifications: IEC 348:1978 / HD 401 S1:1981 Safety: UL 1244 CSA-C22.2 No.
Page 240: Hp 54620 Documentation
Programming Information HP 54620A/C Programmer’s Guide HP 54620A/C Programmer’s Reference is supplied as a help file on a 3.5" diskette. The diskette includes a help file viewer for Microsoft Windows 3.1 and Microsoft Write editor versions of the files. ASCII files are also supplied.
Page 242 • © Copyright Hewlett- Safety Safety Symbols Service instructions are for Packard Company 1994, 1995 trained service personnel. To This apparatus has been avoid dangerous electric All Rights Reserved. designed and tested in shock, do not perform any accordance with IEC Instruction manual symbol: service unless qualified to do Publication 348, Safety...
Page 243: Publication Number
This Hewlett-Packard This is the first edition of the Hewlett-Packard edition and of any changed product has a warranty HP 54620A/C Logic specifically disclaims the pages to that edition. against defects in material Analyzer User and Service implied warranties of and workmanship for a period Guide.

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54620c

HP 54620A User's And Service Manual

Table of Contents

Replaceable Parts

1 Getting Started

2 Making Analyzer Measurements

3 Solving Problems

4 Ensuring Accurate Measurements Time Base and Acquisition

5 Testing, Adjusting, and Troubleshooting the Analyzer

6 Replaceable Parts

7 Performance Characteristics

Glossary

Index

HP 54620 Documentation

Quick Links

Chapters

Troubleshooting

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Summary of Contents for HP 54620A

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Table of Contents