Agilent Technologies 54641A User manual

Service Guide
Publication Number 54642-97004
September 2002
For Safety Information and Re ulatory information,
see the pa es at the end of this book.
© Copyri ht A ilent Technolo ies 2002
All Ri hts Reserved
Agilent 54641A/42A
Oscilloscopes and
Agilent 54641D/42D
Mixed-Signal Oscilloscopes
service.book Page i Wednesday, August 28, 2002 3:25 PM

ii
The Oscilloscope At a Glance
Choose from a variety of oscilloscopes
all with 2 GSa/s sample rate and
2 MBytes of MegaZoom deep memory
per channel for capturing long,
non-repeating signals.
•Agilent 54641A - 2-channel, 350-MHz
bandwidth
•Agilent 54641D - 2-channel +16 logic
channels, 350-MHz bandwidth
•Agilent 54642A - 2-channel, 500-MHz
bandwidth
•Agilent 54642D - 2-channel +16 logic
channels, 500-MHz bandwidth
Display shows current input signals
• All analog and digital (54641D/42D)
channels displayed in main and
delayed mode
• Indicators for channel, time base,
digital (54641D/42D) channel activity,
trigger and acquisition status
• Softkey labels
• Measurement results
Digital channel controls select,
position, and label inputs (54641D/42D)
• Turn channels onor off individuallyor
in groups of 8
• Rearrangeorderofchannelstogroup
related signals
• Create and display labels to identify
channels
General controls measure, save and
restore results, and configure the
oscilloscope
• Waveform math including FFT,
subtract, multiply, integrate, and
differentiate
• Use Quick Meas to make automatic
measurements
• Use cursors to make manual
measurements
• Save or recall measurement
configurations or previous results
• Autoscale performs simple
one-button setup of the oscilloscope
HorizontalControlsselectsweepspeed
and delay parameters
• Sweep speeds from 1 ns/div to
50 s/div
• Delay control moves waveform
display to point of interest
• Delayed mode and delay allow
zooming in to show a portion of
waveform in detail (split screen)
Run control keys begin and end data
acquisition
• Run/Stopstartsandstopscontinuous
acquisitions
• Single performs one acquisition
• Infinitepersistence accumulates and
displays the results of multiple
acquisitions
Trigger keys define what data the
oscilloscope will trigger on
• Source key allows conventional
oscilloscope triggering
• Modes include Edge, Pulse Width,
Pattern, CAN, Duration, I2C, LIN,
Sequence, SPI, TV, and USB
triggering
Softkeys extend the functionality of
command keys
Select measurement types, operating
modes,triggerspecifications,labeldata,
and more
Digitalchannelinputsthrough a flexible
probing system (54641D/42D)
• Sixteen channels through a dual
8-channel cable with micro-clips
• Set logic levels as TTL, CMOS, ECL, or
to a user-definable voltage
Utilities
• Dedicated parallel printer port,
controller operation, floppy disk
storage
Built in Quick Help system
• Press and hold any key front-panel
key or softkey to get help in 11
languages.
service.book Page ii Wednesday, August 28, 2002 3:25 PM

iii
In his Book
This book provides the service information for the A ilent 54641A/42A
Oscilloscope and the A ilent 54641D/42D Mixed-Si nal Oscilloscope.
This manual is divided into these chapters:
Chapter 1 provides eneral information and specifications.
Chapter 2 shows you how to prepare the oscilloscope for use.
Chapter 3 ives performance tests.
Chapter 4 covers calibration and adjustment procedures.
Chapter 5 provides troubleshootin information.
Chapter 6 ives the procedures and techniques for replacin assemblies and
other parts.
Chapter 7 includes a list of replaceable parts, part orderin information, and
shippin information.
At the back of the book you will find Safety information, Warranties, and
Re ulatory information.
service.book Page iii Wednesday, August 28, 2002 3:25 PM

iv
service.book Page iv Wednesday, August 28, 2002 3:25 PM

Contents
Contents-1
1 General Information
To inspect packa e contents 1-3
To inspect options and accessories 1-6
Performance Characteristics 1-9
2 Preparing the Oscilloscope for Use
Setting up the Oscilloscope 2-3
To adjust the handle 2-4
To power-on the oscilloscope 2-5
To adjust the waveform intensity 2-6
To connect the oscilloscope analo probes 2-7
To compensate your analo probe 2-8
To use the di ital probes (mixed-si nal oscilloscope only) 2-9
To connect a printer 2-13
To connect an RS-232 cable 2-13
To verify basic oscilloscope operation 2-14
Getting started using the oscilloscope interface 2-15
Using Quick Help 2-17
Selectin a lan ua e for Quick Help when the oscilloscope starts up 2-17
Selectin a lan ua e for Quick Help after you have been operatin the
oscilloscope 2-18
Loadin an updated lan ua e file from floppy disk 2-19
Cleaning the oscilloscope 2-20
3 Testing Performance
List of Test Equipment 3-3
To construct the test connector 3-4
To test the 54641D/42D Oscilloscope di ital channels 3-5
To verify threshold accuracy 3-6
To verify volta e measurement accuracy 3-10
To verify bandwidth 3-13
To verify horizontal Dt and 1/Dt accuracy 3-15
To verify tri er sensitivity 3-17
A ilent 54642A/42D Performance Test Record 3-20
A ilent 54641A/41D Performance Test Record 3-21
service.book Page 1 Wednesday, August 28, 2002 3:25 PM

Contents
Contents-2
4 Calibrating an A justing
To adjust the power supply 4-4
To perform User Cal 4-7
To adjust the oscilloscope display 4-8
5 Troubleshooting
Solving General Problems with the Oscilloscopes 5-3
If there is no trace display 5-3
If the trace display is unusual or unexpected 5-4
If you cannot see a channel 5-5
roubleshooting the Oscilloscope 5-6
To construct your own dummy load 5-7
To check out the oscilloscope 5-8
To check the Low Volta e Power Supply 5-11
To run the internal self-tests 5-13
6 Replacing Assemblies
To remove the cabinet 6-4
To remove the fan 6-5
To remove the floppy drive 6-6
To remove the front panel 6-7
To remove the display 6-8
To remove the system board 6-10
To remove the power supply 6-12
To remove the keyboard assembly 6-15
To remove the handle 6-16
7 Replaceable Parts
To order a replacement part 7-3
service.book Page 2 Wednesday, August 28, 2002 3:25 PM

1
General Information

1-2
General Information
This chapter lists general information for the Agilent 54640-series
Oscilloscopes. It also includes performance characteristics and
specifications for the oscilloscopes.

1-3
General Information
To inspect package contents
❏Inspect the shipping container for damage.
If our shipping container appears to be damaged, keep the shipping container
or cushioning material until ou have inspected the contents of the shipment
for completeness and have checked the oscilloscope mechanicall and
electricall .
❏Verify that you received the following items and any optional accessories in
the oscilloscope packaging (see figure following).
• 54640-Series Oscilloscope (54641A, 41D, 42A, or 42D)
• 10073C 10:1 500 MHz passive probes with ID (qt 2)
• 54620-68701 digital probe kit (for 54641D or 42D)
• Accessor pouch and front-panel cover
• Power cord (see table 1-3)
• IntuiLink for 54600-series Oscilloscopes software and RS-232 cable.
IntuiLink is a Windows application that makes it ver eas for ou to
download images, waveform data, or oscilloscope setups from the
oscilloscope to our pc using either Microsoft Word or Microsoft Excel. After
installation of IntuiLink, a tool bar in these Microsoft applications will make
connection and data transfer from the oscilloscope ver simple.
IntuiLink software is available free on the web at:
www.agilent.com/find/5462xsw
RS-232 cable ma be ordered separatel , part number 34398A
If an thing is missing, contact our nearest Agilent Sales Office. If the shipment
was damaged, contact the carrier, then contact the nearest Agilent Sales Office.

1-4
General Information
• Agilent IntuiLink Data Capture
IntuiLink Data Capture is a standalone program for downloading waveform
data from the oscilloscopes to our PC via GPIB or RS-232 interface. It
provides the capabilit to transfer deep memor data out of the oscilloscope,
allowing up to 4MB (scope channels) and 8MB (logic channels). The
IntuiLink for 54600-Series limits the size of acquisition data available to a
maximum of 2,000 points regardless of actual number of acquisition points
on the screen. With the IntuiLink Data Capture, the amount of points
transferred will be the actual number of acquisition points currentl
displa ed or ou ma select the number of points to download. It provides
the following functionalit :
• Download waveform data and displa the data as a simple chart
• Save the data as binar or text files
• Cop the chart and a selected portion of the data to the clipboard. The
maximum data saved to the clipboard is 50,000 point
• Load saved waveform data back into the application
❏Inspect the oscilloscope
• If there is mechanical damage or a defect, or if the oscilloscope does not
operate properl or does not pass the performance tests listed in the Service
Guide, notif our Agilent Sales Office.
• If the shipping container is damaged, or the cushioning materials show signs
of stress, notif the carrier and our Agilent Sales Office. Keep the shipping
materials for the carrier’s inspection. The Agilent Sales Office will arrange
for repair or replacement at Agilent’s option, without waiting for claim
settlement.

1-5
General Information
Figure 1-1
Package contents for 54640-Series Oscilloscopes
s
s1

10073C Probes (qty 2)
Power cord
Accessories pouch and
front-panel cover
54620-61801 16-channel cable**
5959-9334 2” Probe
ground lead (qty 5)
5090-4833 Grabber
(qty 20)
54640-Series Oscilloscope 54620-68701 digital probe kit*
* 54641D /42D only
*
* The following additional replacement parts (not included) are available for the digital cable:
5959-9333 replacement probe leads (qty 5)
5959-9335 replacement pod grounds (qty 5)
01650-94309 package of probe labels
IntuiLink for 54600-series
software, Data Capture
software and serial cable

1-6
General Information
To inspect options and accessories
❏Verify that you received the options and accessories you ordered and that none
were damaged.
If an thing is missing, contact our nearest Agilent Sales Office. If the shipment
was damaged, or the cushioning materials show signs of stress, notif the carrier
and our Agilent Sales Office.
Some of the options and accessories available for the 54640-Series Oscilloscopes
are listed in tables 1-1 am 1-2. Contact our Agilent Sales Office for a complete
list of options and accessories.
Table 1-1 Options available
Option Description
003 Shielding Option for use in severe environments or with sensitive devices under
test–shields both ways (in and out):
RS-03 magnetic interface shielding added to CRT, and
RE-02 display shield added to CRT to reduce radiated interference.
1CM Rackmount kit (same as Agilent 1186A)
A6J ANSII Z540 compliant calibration service
See table 1-3 for power cord options

1-7
General Information
Table 1-2 Accessories available
Model Description
01650-61607 16:16 digital cable and terminator (for use with 54641D/42D)
54620-68701 16:2 x 8 digital input probe assembly (shipped standard with 54641D/42D)
1146A 100 kHz current probe, ac/dc
1183A Testmobile scope cart
1185A Carrying case
1186A Rackmount kit
10070C 1:1 passive probe with ID
10072A Fine-pitch probe kit
10073C 10:1 500 MHz probe with ID
10075A 0.5 mm IC clip kit
10076A 100:1, 4 kV 250 MHz probe with ID
10100C 50Ωtermination
10833A GPIB cable, 1 m long
34398A RS-232 cable (standard with 100 MHz models)
E2613B 0.5 mm Wedge probe adapter, 3-signal, qty 2
E2614A 0.5 mm Wedge probe adapter, 8-signal, qty 1
E2615B 0.65 mm Wedge probe adapter, 3-signal, qty 2
E2616A 0.65 mm Wedge probe adapter, 8-signal, qty 1
E2643A 0.5 mm Wedge probe adapter, 16-signal, qty 1
E2644A 0.65 mm Wedge probe adapter, 16-signal, qty 1
N2726A Accessory pouch and front-panel cover
N2727A Thermal printer and pouch
N2728A 10 rolls of thermal printer paper
N2757A GPIB Interface Module
N2758A CAN Trigger Module
N2771A 1000:1, 15 kV, 50 MHz high voltage probe
N2772A 20 MHz differential probe
N2773A Differential probe power supply
N2774A 50 MHz current probe, ac/dc
N2775A Power supply for N2774A

1-8
General Information
Table 1-3. Power Cords
Plug Type Cable Part Number Plug Type Cable Part Number
Opt 900 (U.K.) 8120-1703 Opt 918 (Japan) 8120-4754
Opt 901 (Australia) 8120-0696 Opt 919 (Israel) 8120-6799
Opt 902 (Europe) 8120-1692 Opt 920 (Argentina) 8120-6871
Opt 903 (U.S.A.) 8120-1521 Opt 921 (Chile) 8120-6979
Opt 906 (Switzerland) 8120-2296 Opt 922 (China) 8120-8377
Opt 912 (Denmark) 8120-2957 Opt 927 (Thailand) 8120-8871
Opt 917 (Africa) 8120-4600

1-9
General Information
Acquisition: Analog Channels
Performance haracteristics
* Denotes Warranted Specifications, all others are typical. Specifications are valid after a 30-minute warm-up period and
±10 °C from firmware calibration temperature.
Acquisition: Analog Channels
Max Sample rate 2 GSa/s interleaved, 1 GSa/s each channel
Max Memory Depth 8 MB interleaved, 4 MB each channel
Vertical Resolution 8 bits
Peak Detection 1 ns @ max sample rate
Averages selectable from 2, 4, 8, 16, 32, 64 ...to 16383
High Resolution Mode 12 bits of resolution when ≥100 us/div, average mode with average = 1
Filter: Sinx/x interpolation (single shot BW = sample rate/4 or bandwidth of scope, whichever
is less) with vectors on.
Acquisition: Digital Channels (on 54641D and 54642D only)
Max Sample Rate 1 GSa/s
Max Memory Depth 4 MB
Vertical Resolution 1 bit
Glitch Detection (min pulse width) 5 ns

1-10
General Information
Vertical System: Analog Channels
Vertical System: Analog Channels
Analog channels Ch1 and 2 simultaneous acquisition
Bandwidth (-3dB)* 54641A/41D: dc to 350 MHz
54642A/42D: dc to 500 MHz
ac coupled 54641A/41D: 3.5 Hz to 350 MHz
54642A/42D: 3.5 Hz to 500 MHz
Calculated rise time
(= 0.35/bandwidth) 54641A/41D: ~1.0 ns 54642A/42D: ~700 ps
Single Shot Bandwidth 54641A/41D: 350 MHz maximum
54642A/42D: 500 MHz maximum
Range12 mV/div to 5 V/div
Maximum Input CAT I 300 Vrms, 400 Vpk
CAT II 100 Vrms, 400 Vpk
with 10073C 10:1 probe: CAT I 500 Vpk, CAT II 400 Vpk
5 Vrms with 50-ohm input
Offset Range ±5 V on ranges <10 mV/div
±20 V on ranges 10 mV/div to 200 mV/div
±75 V on ranges >200 mV/div
Dynamic Range Lesser of ±8 div or ±32 V
Input Resistance 1 MΩ±1%, 50-ohm selectable
Input Capacitance ~ 13 pF
Coupling ac, dc
BW Limit ~ 25 MHz selectable
Channel-to-Channel Isolation
(with channels at same V/div) DC to max bandwidth > 40 dB
Probes 10:1 10073C shipped standard for each analog channel
Probe ID (Agilent/HP &
Tek Compatible) Auto probe sense
12 mV/div is a magnification of 4 mV/div setting. For vertical accuracy calculations, use full scale of 32 mV for 2 mV/div sensitivity setting.
* Denotes Warranted Specifications, all others are typical. Specifications are valid after a 30-minute warm-up period and
±10 °C from firmware calibration temperature.

1-11
General Information
Vertical System: Analog Channels (continued)
Vertical System: Analog Channels (continued)
ESD Tolerance ±2 kV
Noise Peak-to-Peak 3% full scale or 3 mV, whichever is greater
Common Mode Rejection Ratio 20 dB @ 50 MHz
DC Vertical Gain Accuracy*1±2.0% full scale
DC Vertical Offset Accuracy ≤200 mV/div: ±0.1 div ±2.0 mV ±0.5% offset
>200 mV/div: ±0.1 div ±2.0 mV ±1.5% offset value
Single Cursor Accuracy1±{DC Vertical Gain Accuracy + DC Vertical Offset
Accuracy + 0.2% full scale (~1/2 LSB) }
Example: For 50 mV signal, scope set to 10 mV/div (80 mV full scale), 5 mV offset,
accuracy = ±{2.0%(80mV) + 0.1 (10 mV) + 2.0 mV + 0.5% (5 mV) + 0.2%(80 mV)} = ±4.78 mV
Dual Cursor Accuracy*1±{DC Vertical Gain Accuracy + 0.4% full scale (~1 LSB)}
Example: For 50 mV signal, scope set to 10 mV/div (80 mV full scale), 5 mV offset,
accuracy = ±{2.0%(80 mV) + 0.4%(80 mV)} = ±1.92 mV
12 mV/div is a magnification of 4 mV/div setting. For vertical accuracy calculations, use full scale of32 mV for 2 mV/div sensitivity setting.
Vertical System: Digital Channels (54641D and 54642D only)
Number of Channels 16 Digital –labeled D15 –D0
Threshold Groupings Pod 1: D7 –D0
Pod 2: D15 –D8
Threshold Selections TTL, CMOS, ECL, user-definable (selectable by pod)
User-Defined Threshold Range ±8.0 V in 10 mV increments
Maximum Input
Voltage ±40 V peak CAT I
Threshold Accuracy* ±(100 mV + 3% of threshold setting)
Input Dynamic Range ±10 V about threshold
Minimum Input Voltage Swing 500 mV peak-to-peak
Input Capacitance ~ 8 pF
Input Resistance 100 kΩ±2% at probe tip
Channel-to-Channel Skew 2 ns typical, 3 ns maximum
* Denotes Warranted Specifications, all others are typical. Specifications are valid after a 30-minute warm-up period and
±10 °C from firmware calibration temperature.

1-12
General Information
Horizontal
Horizontal
Range 1 ns/div to 50 s/div
Resolution 2.5 ps
Vernier 1-2-5 increments when off, 25 minor increments between major settings when on
Reference Positions Left, Center, Right
Delay Range
Pre-trigger (negative delay)
Post-trigger (positive delay) Greater of 1 screen width or 1 ms 500 seconds
Analog Delta-t Accuracy
Same Channel*
Channel-to-Channel
±0.005% reading ±0.1% screen width ±20 ps
Example: for signal with pulse width of 10 us, scope set to 5 us/div (50us screen width),
delta-t accuracy = ±{.005%(10 us) + 0.1% (50 us) + 20 ps} = 50.52 ns
±0.005% reading ±0.1% screen width ±40 ps
Digital Delta-t Accuracy
Same Channel
Channel-to-Channel
(non-Vernier settings)
±0.005% reading ±0.1% screen width ±(1 digital sample period, 1 ns)
Example: for signal with pulse width of 10 us, scope set to 5 us/div (50us screen width),
and single pod active (1 GSa/s), delta-t accuracy = ±{.005%(10 us) + 0.1% (50 us) + 1 ns}
= 51.5 ns
±0.005% reading ±0.1% screen width ±(1 digital sample period) ±(chan-to-chan skew)
Delay Jitter 10 ppm
RMS Jitter 0.025% screen width + 30 ps
Modes Main, Delayed, Roll, XY
XYBandwidth
Phase error @ 1 MHz Max bandwidth 1.8 degrees
* Denotes Warranted Specifications, all others are typical. Specifications are valid after a 30-minute warm-up period and
±10 °C from firmware calibration temperature.

1-13
General Information
Trigger System
Trigger System
Sources: 54641A/42A: Ch 1, 2, line, ext
54641D/42D: Ch 1, 2, line, ext, D15 - D0
Modes Auto, Triggered (normal), Single
Holdoff Time ~60 ns to 10 seconds
Selections Edge, Pattern, Pulse Width, CAN, Duration, I2C, Sequence, SPI, TV, USB
Edge Trigger on a rising or falling edge of any source.
Pattern Trigger on a pattern of high, low, and don’t care levels and a rising or falling edge
establishedacross any of thesources. The analog channel’s high or low level is defined
by that channel’s trigger level.
Pulse Width Trigger when a positive- or negative-going pulse is less than, greater than, or within a
specified range on any of the source channels.
Minimum pulse width setting: 2 ns
Maximum pulse width setting: 10 s
CAN Trigger on CAN (Controller Area Network) version 2.0A and 2.0B signals. It can trigger
ontheStartofFramebitofadataframe,aremotetransferrequestframe,or an overload
frame.
Duration Trigger on a multi-channel pattern whose time duration is less than a value, greater
than a value, greater than a time value with a timeout value, or inside or outside of a set
of time values.
Minimum duration setting: 5 ns
Maximum duration setting: 10 s
I2C Trigger on I2C (Inter-IC bus) serialprotocol at a start/stop condition, a restart, a missing
acknowledge, or user defined frame with address and/or data values. Also trigger on
Missing Acknowledge, Restart, EEPROM read, and 10-bit write.
LIN Trigger on LIN (Local Interconnect Network) sync break at beginning of message frame.
Sequence Find event A, trigger on event B, with option to reset on event C or time delay.
SPI Trigger on SPI (Serial Peripheral Interface) a data pattern during a specific framing
period. Support positive and negative Chip Select framing ad well as clock Idle framing
and user-specified number of bits per frame.
USB Trigger on USB (Universal Serial Bus) Start of Packet, End of Packet, Reset Complete,
Enter Suspend, or Exit Suspend on the differential USB data lines. USB low speed and
high speed are supported.
TV Trigger on any analog channel for NTSC, PAL, PAL-M, or SECAM broadcast standards
on either positive or negative composite video signals. Modes supported include Field
1, Field 2, or both, all lines, or any line within a field. Also supports triggering on non-
interlaced fields. TV trigger sensitivity: 0.5 division of synch signal.
Autoscale Finds and displays all active analog and digital (for 54641D/54642D) channels, sets edge
trigger mode on highest numbered channel, sets vertical sensitivity on analog channels
andthresholds on digitalchannels, timebasetodisplay~1.8periods. Requiresminimum
voltage >10 mVpp, 0.5% duty cycle and minimum frequency >50 Hz.
* Denotes Warranted Specifications, all others are typical. Specifications are valid after a 30-minute warm-up period and
±10 °C from firmware calibration temperature.

1-14
General Information
Analog Channel Triggering
Analog Channel Triggering
Range (Internal) ±6 div
Sensitivity* <10 mV/div: Greater of 1 div or 5 mV
≥10 mV/div: 0.6 div
Coupling ac (~10 Hz), dc, noise reject, HF reject and LF reject (~ 50 kHz)
Digital (D15 - D0) Channel Triggering (54641D and 54642D)
Threshold Range (user-defined) ±8.0 V in 10 mV increments
Threshold Accuracy* ±(100 mV + 3% of threshold setting)
Predefined Thresholds TTL = 1.4 V, CMOS = 2.5 V, ECL = -1.3 V
External (EXT) Triggering
Input Resistance 1 MΩ±3% or 50-Ohm
Input Impedance ~ 13 pF
Maximum Input CAT I 300 Vrms, 400 Vpk
CAT II 100 Vrms, 400 Vpk
with 10073C 10:1 probe:CAT I 500 Vpk, CAT II 400 Vpk
5 Vrms with 50-ohm input
Range DC coupling: trigger level ±8 V
AC coupling/LF reject: AC input minus trigger level not to exceed ±8 V
Sensitivity DC to 100 MHz, < 100 mV
100 MHz to max bandwidth, < 200 mV
Coupling ac (~ 3.5 Hz), dc, noise reject, HF reject and LF reject (~ 50 kHz)
Probe Id (Agilent/HP &Tek
compatible) Auto probe sense for 54641A/42A
* Denotes Warranted Specifications, all others are typical. Specifications are valid after a 30-minute warm-up period and
±10 °C from firmware calibration temperature.