Agilent InfiniiVision
2000/3000 X-Series
Oscilloscopes
Service Guide
s1
Notices
CAUTION
WARNING
© Agilent Technologies, Inc. 2008-2012
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into a foreign language) without prior agreement and written consent from Agilent
Technologies, Inc. as governed by United
States and international copyright laws.
Manual Part Number
75019-97039, February 2012
Print History:
75019-97012, January 2011
75019-97015, July 2011
75019-97039, October 2011
Available in electronic format only
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A newer version of this manual
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3000X-Series-manual
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Safety Notices
A CAUTION notice denotes a hazard. It calls attention to an operating procedure, practice, or the like
that, if not correctly performed or
adhered to, could result in damage
to the product or loss of important
data. Do not proceed beyond a
CAUTION notice until the indicated
conditions are fully understood and
met.
A WARNING notice denotes a
hazard. It calls attention to an
operating procedure, practice, or
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notice until the indicated conditions are fully understood and
met.
2000/3000 X-Series Oscilloscopes Service Guide
In This Service Guide
This book provides the service information for the Agilent
2000/3000 X-Series oscilloscopes. This manual is divided
into these chapters:
1 Characteristics and Specifications
This chapter contains a partial list of characteristics and
specifications for the Agilent InfiniiVision
2000/3000 X-Series oscilloscopes.
2Testing Performance
This chapter explains how to verify correct oscilloscope
operation and perform tests to ensure that the oscilloscope
meets the performance specifications.
3 Calibrating and Adjusting
This chapter explains how to adjust the oscilloscope for
optimum operating performance.
4Troubleshooting
This chapter begins with suggestions for solving general
problems that you may encounter with the oscilloscope.
Procedures for troubleshooting the oscilloscope follow the
problem solving suggestions.
5Replacing Assemblies
This chapter describes how to remove assemblies from the
2000/3000 X-Series oscilloscope.
6Replaceable Parts
This chapter describes how to order replaceable assemblies
and parts for the Agilent 2000/3000 X-Series oscilloscopes.
It includes diagrams and parts lists for hardware that you
can order.
2000/3000 X-Series Oscilloscopes Service Guide 3
7Safety Notices
At the front of the book you will find safety notice
descriptions and document warranties.
Digital Channels
Because all of the oscilloscopes in the Agilent 2000/3000 X-Series have analog
channels, the analog channel topics in this book apply to all instruments.
Whenever a topic discusses the digital channels, that information applies only to
Mixed-Signal Oscilloscope (MSO) models or DSO models that have been
upgraded to an MSO.
Abbreviated instructions for pressing a series of keys
Instructions for pressing a series of keys are written in an abbreviated manner.
Instructions for pressing Key1, then pressing Softkey2, then pressing Softkey3 are
abbreviated as follows:
Press [Key1] & Softkey2 & Softkey3.
The keys may be front panel keys, or softkeys, which are located directly below
the oscilloscope display.
4 2000/3000 X-Series Oscilloscopes Service Guide
Contents
In This Service Guide 3
Figures 9
Ta b le s 13
1 Characteristics and Specifications 15
Power Requirements 16
Measurement Category 17
Measurement Category 17
Measurement Category Definitions 17
Transient Withstand Capability 18
Environmental Conditions 19
Specifications 20
Contact us 21
2Testing Performance23
Overview 24
List of Test Equipment 25
Conventions 26
To construct the test connector (for use with MSO models
only) 27
To test digital channels (MSO models only) 29
To verify digital channel threshold accuracy (MSO models
only) 30
When to Test 30
2000/3000 X-Series Oscilloscopes Service Guide 5
Contents
What to Test 30
Verifying Test Results 30
To verify DC vertical gain accuracy 35
To verify dual cursor accuracy 42
To verify bandwidth (-3 dB) 49
To verify time base accuracy 55
To verify trigger sensitivity 57
Test Internal Trigger Sensitivity (all models) 58
Test External Trigger Sensitivity 60
Agilent 2000 X-Series Oscilloscopes Performance Test Record 63
Agilent 3000 X-Series Oscilloscopes Performance Test Record 65
3 Calibrating and Adjusting 67
6 2000/3000 X-Series Oscilloscopes Service Guide
User Calibration 69
To perform User Cal 69
User Cal Status 72
4Troubleshooting73
Solving General Problems with the Oscilloscope 74
If there is no display 74
If there is no trace display 75
If the trace display is unusual or unexpected 75
If you cannot see a channel 76
Verifying Basic Operation 77
To power-on the oscilloscope 77
To perform hardware self test 78
To perform front panel self test 78
To verify default setup 79
To perform an Auto Scale on the Probe Comp signal 80
To compensate passive probes 81
Troubleshooting Internal Assemblies 83
Equipment Required for Troubleshooting Internal
Assemblies 83
To prepare for internal assembly troubleshooting 84
Flowchart for Troubleshooting Internal Assemblies 87
System Board Drawings 88
To check the system board power supply test points 90
To check the interboard supply connector voltages 91
To check the line filter board AC output 93
To check the power switch 95
To check the power supply DC output 96
To check the display supplies 97
To check the keyboard supplies 98
To check the fan 99
5Replacing Assemblies101
Contents
To remove the front panel knobs 104
To remove the bucket assembly 105
To remove the power supply shield 107
To remove the rear deck assembly 110
To remove the acquisition board 117
To remove the front panel assembly 122
To remove the display assembly 129
Replacing a 75019-68712 Display Assembly 131
To remove the fan assembly 134
To remove the power supply 136
To remove the line filter board 139
6Replaceable Parts145
Ordering Replaceable Parts 146
2000/3000 X-Series Oscilloscopes Service Guide 7
Contents
Listed Parts 146
Unlisted Parts 146
Direct Mail Order System 146
Exchange Assemblies 147
Exploded Views 148
Replaceable Parts List 150
7Safety Notices157
Warnings 157
To clean the instrument 158
Safety Symbols 159
Index 161
8 2000/3000 X-Series Oscilloscopes Service Guide
Figures
Figure 1. Constructing the 8-by-2 Connector 28
Figure 2. Setting Up Equipment for Digital Channel Threshold
Accuracy Test 32
Figure 3. Setting up Equipment for DC Vertical Gain Accuracy
Te s t 39
Figure 4. Using a Blocking Capacitor to Reduce Noise 41
Figure 5. Setting up Equipment for Dual Cursor Accuracy Test 46
Figure 6. Using a Blocking Capacitor to Reduce Noise 48
Figure 7. Setting Up Equipment for Bandwidth (-3 dB) Verification
Te s t 51
Figure 8. Setting Up Equipment for Internal Trigger Sensitivity
Te s t 58
Figure 9. Setting Up Equipment for 4-Channel External Trigger
Sensitivity Test 61
Figure 10. User Calibration cable for 2-channel oscilloscope 70
Figure 11. User Calibration cable for 4-channel oscilloscope 71
Figure 12. Default setup screen 80
Figure 13. Example pulses 82
Figure 14. Setup for troubleshooting internal assemblies 85
Figure 15. System Board Test Points/Connectors - Top Side,
Left 88
Figure 16. System Board Test Points/Connectors - Top Side,
Right 89
Figure 17. Line filter board interboard supply connector J108 92
Figure 18. Verify line filter board AC output 94
Figure 19. Verify power switch operation 95
Figure 20. Location of the Fan Connector 100
Figure 21. Removing the front panel knobs 104
Figure 22. Removing the bucket screws 105
Figure 23. Removing bucket assembly 106
2000/3000 X-Series Oscilloscopes Service Guide 9
Figures
Figure 24. Removing the power supply shield screw 107
Figure 25. Unclipping the power supply shield right side 108
Figure 26. Removing the power supply shield - lift and pull
out 109
Figure 27. Removing the BNC nuts and washers 110
Figure 28. Removing the top rear deck screws 111
Figure 29. Removing the bottom right rear deck screw 111
Figure 30. Removing the bottom left rear deck screw 112
Figure 31. Removing the bottom rear deck screws 112
Figure 32. Removing the option module guide to acquisition board
screw 113
Figure 33. Disconnecting the interboard supply cable from the
acquisition board 114
Figure 34. Lifting front bezel latch 115
Figure 35. Separating the rear and front decks 116
Figure 36. Rear and front decks separated 116
Figure 37. Removing the T6 screws (4 channel version) 117
Figure 38. Disconnecting keyboard and display cables from
acquisition board 118
Figure 39. Disconnecting display backlight power cable from
acquisition board 119
Figure 40. Acquisition board mounting screw locations 120
Figure 41. Acquisition board removed from front deck 121
Figure 42. Release the bezel clips from the front deck 122
Figure 43. All bezel clips released 123
Figure 44. HINT: When reinstalling bezel, align ground terminal
first 123
Figure 45. Gently lift front deck from bezel 124
Figure 46. Disconnect the keyboard cable 125
Figure 47. Disconnect the softkey board cable 126
Figure 48. Unclip the softkey board from the bezel 127
Figure 49. Remove the softkey keypad from the bezel 127
Figure 50. Unclip the keyboard board from the bezel 128
Figure 51. Remove the keyboard keypad from the bezel 128
10 2000/3000 X-Series Oscilloscopes Service Guide
Figures
Figure 52. Removing the display assembly 129
Figure 53. Display assembly removed 130
Figure 54. The 75019-68712 display assembly has a bracket under
two of the retaining screws 131
Figure 55. Disassembling the 75019-68712 display assembly 132
Figure 56. Separating the 75019-68712 display mounting
bracket 133
Figure 57. Removing the 75019-61606 display cable 133
Figure 58. Disconnecting fan power cable 134
Figure 59. Removing fan assembly 135
Figure 60. Disconnecting the AC cable 136
Figure 61. Disconnecting the interboard supply cable from the line
filter board 137
Figure 62. Disconnecting the DC cable from the line filter
board 137
Figure 63. Removing the power supply 138
Figure 64. Removing the option module guide 139
Figure 65. Disconnecting the ground wire 140
Figure 66. Removing the line filter board screws 141
Figure 67. Removing the line filter board 142
Figure 68. Removing the power switch extender 143
Figure 69. Exploded View 1 of 2 148
Figure 70. Exploded View 2 of 2 149
2000/3000 X-Series Oscilloscopes Service Guide 11
Figures
12 2000/3000 X-Series Oscilloscopes Service Guide
Ta bl e s
Table 1. List of test equipment 25
Table 2. Conventions 26
Table 3. Materials required to construct the test connectors 27
Table 4. Equipment Required to Test Digital Channel Threshold
Accuracy 31
Table 5. Threshold Accuracy Voltage Test Settings 33
Table 6. DC Vertical Gain Accuracy Test Limits 35
Table 7. Equipment Required to Verify DC Vertical Gain
Accuracy 36
Table 8. Settings Used to Verify DC Vertical Gain Accuracy,
2000 X-Series Models 37
Table 9. Settings Used to Verify DC Vertical Gain Accuracy,
3000 X-Series Models 38
Table 10. Equipment Required to Verify Dual Cursor Accuracy 43
Table 11. Settings Used to Verify Dual Cursor Accuracy,
2000 X-Series Models 44
Table 12. Settings Used to Verify Dual Cursor Accuracy,
3000 X-Series Models 45
Tab le 13 . Ba nd wid th (- 3 dB ) Test Li mi ts 49
Table 14. Equipment Required to Verify Bandwidth (-3 dB) 50
Table 15. Equipment Required to Verify Time Base Accuracy 55
Table 16. Equipment Required to Verify Trigger Sensitivity 57
Table 17. Equipment Required to Troubleshoot the
Oscilloscope 83
Table 18. Replaceable Parts 150
2000/3000 X-Series Oscilloscopes Service Guide 13
Tables
14 2000/3000 X-Series Oscilloscopes Service Guide
Agilent InfiniiVision 2000/3000 X-Series Oscilloscope
Service Guide
1
Characteristics and Specifications
Power Requirements 16
Measurement Category 17
Environmental Conditions 19
Specifications 20
Contact us 21
This chapter contains a partial list of characteristics and
specifications for the Agilent InfiniiVision
2000/3000 X-Series oscilloscopes.
For a full list of Agilent InfiniiVision 2000/3000 X-Series
oscilloscopes characteristics and specifications see the data
sheets.
The data sheets are available at
www.agilent.com/find/2000X-Series or
www.agilent.com/find/3000X-Series.
s1
15
1 Characteristics and Specifications
Power Requirements
Line voltage, frequency, and power:
• ~Line 100- 120 Vac, 50/60/400 Hz
• 100- 240 Vac, 50/60 Hz
• 100 W max
16 2000/3000 X-Series Oscilloscopes Service Guide
Measurement Category
WARNING
Measurement Category
Measurement Category Definitions
Characteristics and Specifications 1
The InfiniiVision 2000/3000 X-Series oscilloscope is intended
to be used for measurements in Measurement Category I.
Use this instrument only for measurements within its specified
measurement category.
Measurement category I is for measurements performed on
circuits not directly connected to MAINS. Examples are
measurements on circuits not derived from MAINS, and
specially protected (internal) MAINS derived circuits. In the
latter case, transient stresses are variable; for that reason,
the transient withstand capability of the equipment is made
known to the user.
Measurement category II is for measurements performed on
circuits directly connected to the low voltage installation.
Examples are measurements on household appliances,
portable tools and similar equipment.
2000/3000 X-Series Oscilloscopes Service Guide 17
Measurement category III is for measurements performed in
the building installation. Examples are measurements on
distribution boards, circuit- breakers, wiring, including cables,
bus- bars, junction boxes, switches, socket-outlets in the fixed
installation, and equipment for industrial use and some
other equipment, for example, stationary motors with
permanent connection to the fixed installation.
Measurement category IV is for measurements performed at
the source of the low-voltage installation. Examples are
electricity meters and measurements on primary overcurrent
protection devices and ripple control units.
1 Characteristics and Specifications
CAUTION
CAUTION
CAUTION
Transient Withstand Capability
Maximum input voltage for analog inputs
CAT I 300 Vrms, 400 Vpk; transient overvoltage 1.6 kVpk
with 10073C 10:1 probe: CAT I 500 Vpk, CAT II 400 Vpk
with N2862A/B or N2863A/B 10:1 probe: 300 Vrms
Do not exceed 5 Vrms in 50 Ω mode (3000 X-Series oscilloscopes only).
Input protection is enabled in 50 Ω mode, and the 50 Ω load will
disconnect if greater than 5 Vrms is detected. However, the input could
still be damaged, depending on the time constant of the signal. The 50
Ω input protection mode only functions when the oscilloscope is
powered on.
Maximum input voltage for logic channels:
18 2000/3000 X-Series Oscilloscopes Service Guide
±40 V peak CAT I; transient overvoltage 800 Vpk
Environmental Conditions
Characteristics and Specifications 1
Environment Indoor use only.
Ambient
temperature
Humidity Operating: Up to 80% RH at or below +40
Altitude Operating and non-operating to 4,000 m (13,123 ft)
Overvoltage
Category
Pollution
Degree
Pollution
Degree
Definitions
Operating 0 °C to +55 °C; non-operating –40 °C to +71 °C
°C. Up to 45% RH up
to +50 °C.
Non-operating: Up to 95% RH up to +40
°C.
+50
This product is intended to be powered by MAINS that comply
to Overvoltage Category II, which is typical of cord-and-plug
connected equipment.
The InfiniiVision 2000/3000 X-Series oscilloscopes may be
operated in environments of Pollution Degree 2 (or Pollution
Degree 1).
Pollution Degree 1: No pollution or only dry, non-conductive
pollution occurs. The pollution has no influence. Example: A
clean room or climate controlled office environment.
Pollution Degree 2. Normally only dry non-conductive pollution
occurs. Occasionally a temporary conductivity caused by
condensation may occur. Example: General indoor
environment.
Pollution Degree 3: Conductive pollution occurs, or dry,
non-conductive pollution occurs which becomes conductive
due to condensation which is expected. Example: Sheltered
outdoor environment.
°C. Up to 45% RH up to
2000/3000 X-Series Oscilloscopes Service Guide 19
1 Characteristics and Specifications
Specifications
Please see the InfiniiVision 2000/3000 X- Series Oscilloscopes
Data Sheet for complete, up- to- date specifications and
characteristics.
To download a copy of the data sheet please visit:
www.agilent.com/find/2000X-Series or
www.agilent.com/find/3000X-Series.
Or go to the Agilent home page at www.agilent.com and
search for 2000/3000 X-Series oscilloscopes data sheet.
To order a data sheet by phone, please contact your local
Agilent office. A contact list is provided on the next page.
The most up-to-date list is available at:
www.agilent.com/find/contactus
20 2000/3000 X-Series Oscilloscopes Service Guide
Contact us
Americas
Canada (877) 894-4414
Latin America 305 269 7500
United States (800) 829-4444
Asia Pacific
Australia 1 800 629 485
China 800 810 0189
Hong Kong 800 938 693
India 1 800 112 929
Japan 81 426 56 7832
Korea 080 769 0800
Malaysia 1 800 888 848
Singapore 1 800 375 8100
Taiwan 0800 047 866
Thailand 1 800 226 008
Europe
Austria 0820 87 44 11
Belgium 32 (0) 2 404 93 40
Denmark 45 70 13 15 15
Finland 358 (0) 10 855 2100
France 0825 010 700
Germany 01805 24 6333*
*0.14€/minute
Ireland 1890 924 204
Italy 39 02 92 60 8484
Netherlands 31 (0) 20 547 2111
Spain 34 (91) 631 3300
Sweden 0200-88 22 55
Switzerland (French)
44 (21) 8113811 (Opt 2)
Switzerland (German)
0800 80 53 53 (Opt 1)
United Kingdom 44 (0) 7004 666666
Other European countries:
www.agilent.com/find/contactus
Characteristics and Specifications 1
2000/3000 X-Series Oscilloscopes Service Guide 21
1 Characteristics and Specifications
22 2000/3000 X-Series Oscilloscopes Service Guide
Agilent InfiniiVision 2000/3000 X-Series Oscilloscope
Service Guide
2
Testing Performance
Overview 24
List of Test Equipment 25
To construct the test connector (for use with MSO models only) 27
To test digital channels (MSO models only) 29
To verify digital channel threshold accuracy (MSO models only) 30
To verify DC vertical gain accuracy 35
To verify dual cursor accuracy 42
To verify bandwidth (-3 dB) 49
To verify time base accuracy 55
To verify trigger sensitivity 57
Agilent 2000 X-Series Oscilloscopes Performance Test Record 63
Agilent 3000 X-Series Oscilloscopes Performance Test Record 65
This chapter explains how to verify correct oscilloscope
operation and perform tests to ensure that the oscilloscope
meets the performance specifications.
s1
23
2 Testing Performance
Overview
To completely test and troubleshoot MSO models, create and
use the test connector accessory as described in this
chapter.
• The test connector is only required for oscilloscopes that
have the MSO option licensed (enabled).
• The connector is used in the digital channel threshold
accuracy test.
• The test connector keeps electrical distortion to a
minimum and makes it easy for you to connect the
oscilloscope probes to function generators and
measurement equipment.
Let the Equipment Warm Up Before Testing
For accurate test results, let the test equipment and the
oscilloscope warm up 30 minutes before testing.
Verifying Test Results
During the tests, record the readings in the Performance
Test Record on page 63. To verify whether a test passes,
verify that the reading is within the limits in the
Performance Test Record.
If a performance test fails
If a performance test fails, first perform the User Cal procedure. Press the
following keys to access User Cal: [Utility]→Service→Start User Cal.
24 2000/3000 X-Series Oscilloscopes Service Guide
Testing Performance 2
List of Test Equipment
Below is a list of test equipment and accessories required to
perform the performance test verification procedures.
Tabl e 1 List of test equipment
Recommended Model/
Equipment Critical Specifications
Test connector, 8-by-2* See page 27 for instructions on building test connector. n/a
Digital Multimeter 0.1 mV resolution, 0.005% accuracy Agilent 34401A
Power Splitter Outputs differ by 0.15 dB Agilent 11667B
Oscilloscope Calibrator DC offset voltage of -5.5 V to 35.5 V, 0.1 V resolution
25 MHz—500 MHz sine wave, 5 ppm
Signal Generator 25 MHz, 100 MHz, 350 MHz, 500 MHz, and 1 GHz
sine waves
Power Meter 1 GHz
Power Sensor 1 GHz
BNC banana cable BNC (m) to dual banana Pomona 2BC-BNC-36 or
BNC cable (qty 3) BNC - BNC, 48” length Agilent 10503A
Cable Type N (m) 609.6 mm (24 in.) Agilent 11500B
Probe cable* No substitute Agilent N6450-60001
Adapter BNC(f) to banana(m) Agilent 1251-2277
Adapter BNC Tee (m) (f) (f) Agilent 1250-0781† or
* Required only for testing digital channels of oscilloscopes that have the MSO option.
Most parts and equipment are available at www.agilent.com. See respective manufacturer’s websites for their equipment.
†
These parts available at www.parts.agilent.com at the time this manual was published.
±3% accuracy Agilent N1914A
±3% accuracy Agilent E9304A or
Part Number
Fluke 5820A
Agilent N5181A
N8482A
Agilent 11001-66001
†
(16-channel) or Agilent
N6459-60001
(8-channel)
Pomona 3285
†
†
2000/3000 X-Series Oscilloscopes Service Guide 25
2 Testing Performance
Tabl e 1 List of test equipment (continued)
Recommended Model/
Equipment Critical Specifications
Adapter Type N (m) to BNC (m) Agilent 1250-0082 or
Blocking capacitor and shorting cap Note: if a BNC blocking capacitor is not available use an
SMA blocking capacitor.
Adapter (qty 3) N(m) to BNC(f) Agilent 1250-0780
50 Ohm Feedthrough Termination 50Ω BNC (f) to BNC (m) Agilent 0960-0301
* Required only for testing digital channels of oscilloscopes that have the MSO option.
Most parts and equipment are available at www.agilent.com. See respective manufacturer’s websites for their equipment.
†
These parts available at www.parts.agilent.com at the time this manual was published.
Part Number
Pomona 3288 with
Pomona 3533
Agilent 11742A +
Pomona 4288 +
Pomona 5088
Conventions
The following conventions will be used when referring to
oscilloscope models throughout this chapter.
Tabl e 2 Conventions
Models Referred to as:
MSO-X /DSO-X 2002A, MSO-X /DSO-X 2004A 70 MHz Models
MSO-X /DSO-X 2012A, MSO-X /DSO-X 2014A
MSO-X /DSO-X 3012A, MSO-X /DSO-X 3014A
MSO-X /DSO-X 2022A, MSO-X /DSO-X 2024A
MSO-X /DSO-X 3024A
MSO-X /DSO-X 3032A, MSO-X /DSO-X 3034A 350 MHz Models
MSO-X /DSO-X 3052A, MSO-X /DSO-X 3054A 500 MHz Models
MSO-X /DSO-X 3102A, MSO-X /DSO-X 3104A 1 GHz Models
100 MHz Models
200 MHz Models
26 2000/3000 X-Series Oscilloscopes Service Guide
Testing Performance 2
To construct the test connector (for use with MSO models only)
Agilent 2000/3000 X- Series oscilloscopes that have digital
channels enabled require the test connector described below.
Follow the steps to build the test connector.
Tabl e 3 Materials required to construct the test connectors
Description Recommended Part Qty
BNC (f) Connector Agilent 1250-1032 or
Pomona 4578
Berg Strip, 8-by-2 3M .100” x .100” Pin
Strip Header or similar
Jumper wire
1 Obtain a BNC connector and an 8-by-2 section of Berg
strip. A longer strip can be cut to length using wire
cutters.
2 On one side of the Berg strip, solder a jumper wire to all
of the pins (shown in Figure 1 on page 28).
3 On the other side of the Berg strip, solder another jumper
wire to all of the pins.
4 Solder the center of the BNC connector to a center pin on
one of the rows on the Berg strip.
5 Solder the ground tab of the BNC connector to a center
pin on the other row on the Berg strip.
1
1 strip, cut to length (8x2)
2000/3000 X-Series Oscilloscopes Service Guide 27
2 Testing Performance
Jumper (2)
Signal Lead
(from scope’s MSO cable)
8 x 2 Berg Strip
BNC Panel Mount Connector
Ground Lead
(from scope’s MSO cable)
Figure 1 Constructing the 8-by-2 Connector
28 2000/3000 X-Series Oscilloscopes Service Guide
To test digital channels (MSO models only)
The acquisition system testing provides confidence that the
acquisition system is functioning correctly. It does not,
however, check a particular specification.
1 Disconnect all probes from the circuit under test and from
any other input source.
2 Using probe leads and grabbers, connect digital channels
D0, D1, D2, and D3 to the Probe Comp signal on the
center of the front panel.
3 Press the [AutoScale] key.
If four square waves appear, the acquisition system is
functioning correctly.
If the square waves do not appear, go to the
“Troubleshooting” chapter. Then return here to finish
testing the digital channels.
4 Disconnect the digital channels from the calibration point.
5 Use steps 2 and 3 to test the following sets of digital
channels. After you test one set of digital channels,
remove them before connecting the next set.
• D4, D5, D6, D7
• D8, D9, D10, D11 (on 3000 X-Series models)
• D12, D13, D14, D15 (on 3000 X- Series models)
Testing Performance 2
2000/3000 X-Series Oscilloscopes Service Guide 29
2 Testing Performance
To verify digital channel threshold accuracy (MSO models only)
This test verifies the digital channel threshold accuracy
specification of the Agilent 2000/3000 X- Series oscilloscopes.
Threshold accuracy test limits: ±(100 mV + 3% of threshold
setting)
When to Test
You should perform this test every 12 months or after 2000
hours of operation, whichever comes first.
What to Test
Use these instructions to test the threshold settings of digital
channels D7-D0. Then, use the same instructions to test
digital channels D15- D8 (on 3000 X- Series).
Verifying Test Results
After each threshold test, record the voltage reading in the
Performance Test Record on page 63. To verify whether a
test passes, verify that the voltage reading is within the
limits in the Performance Test Record.
30 2000/3000 X-Series Oscilloscopes Service Guide
Testing Performance 2
Tabl e 4 Equipment Required to Test Digital Channel Threshold
Accuracy
Critical
Equipment
Specifications Recommended Model/Part
Digital Multimeter 0.1 mV resolution,
0.005% accuracy
Oscilloscope Calibrator DC offset voltage
6.3 V
BNC-Banana Cable Agilent 11001-66001 or
BNC Tee Agilent 1250-0781 or
Ω BNC Cable Agilent 10503A
50
BNC Test Connector,
8-by-2
Probe Cable Agilent N6450-60001
Agilent 34401A
Fluke 5820A
Pomona 2BC-BNC-36
Pomona 3285
User-built (See page 27)
(16-channel) or Agilent
N6459-60001 (8-channel)
1 Turn on the test equipment and the oscilloscope. Let
them warm up for 30 minutes before starting the test.
2 Set up the oscilloscope calibrator.
a Set the oscilloscope calibrator to provide a DC offset
voltage at the Channel 1 output.
b Use the multimeter to monitor the oscilloscope
calibrator DC output voltage.
3 Use the 8-by-2 test connector and the BNC cable
assembly to connect digital channels D0- D7 to one side of
the BNC Tee. Then connect the D0- D7 ground lead to the
ground side of the 8- by- 2 connector. See Figure 2.
2000/3000 X-Series Oscilloscopes Service Guide 31
2 Testing Performance
Probe
Cables
Channels
8 - 15
Channels
0 - 7
Test
Connector
2000/3000 X-Series Oscilloscope
Oscilloscope
Calibrator
Digital
Multimeter
BNC Tee
BNC-Bananna
Cable
Figure 2 Setting Up Equipment for Digital Channel Threshold Accuracy
4 Use a BNC-banana cable to connect the multimeter to the
other side of the BNC Tee.
5 Connect the BNC Tee to the Channel 1 output of the
32 2000/3000 X-Series Oscilloscopes Service Guide
calibrator as shown in Figure 2.
6 On the oscilloscope, press the [Digital] key, then press the
Thresholds softkey, then press the D7 - D0 softkey repeatedly
until the check mark is next to User.
7 Press the User softkey to the right of the D7 - D0 softkey,
then turn the Entry knob ( ) on the front panel of the
Te s t
Testing Performance 2
oscilloscope to set the threshold test settings as shown in
Table 5.
Tabl e 5 Threshold Accuracy Voltage Test Settings
Threshold voltage
setting (in oscilloscope
User softkey)
+5.00 V +5.250 V ±1 mV dc Lower limit = +4.750 V
–5.00 V –4.750 V ±1 mV dc Lower limit = –5.250 V
0.00 V +100m V ±1 mV dc Upper limit = +100 mV
DC offset voltage setting
(on oscilloscope
calibrator) Limits
Upper limit = +5.250 V
Upper limit = –4.750 V
Lower limit = –100 mV
8 Do the following steps for each of the threshold voltage
levels shown in Table 5.
a Set the threshold voltage shown in the User softkey
using the Entry knob on the oscilloscope.
b Enter the corresponding DC offset voltage on the
oscilloscope calibrator front panel. Then use the
multimeter to verify the voltage.
Digital channel activity indicators are displayed on the
status line at the top of the oscilloscope display. The
activity indicators for D7-D0 should show all of the
channels at digital high levels.
c Use the knob on the oscilloscope calibrator to decrease
the offset voltage, in increments of 10 mV, until the
activity indicators for digital channels D7- D0 are all at
digital low levels. Record the oscilloscope calibrator
voltage in the Performance Test Record (see page 63).
d Use the knob on the oscilloscope calibrator to increase
the offset voltage, in increments of 10 mV, until the
activity indicators for digital channels D7- D0 are all at
digital high levels. Record the oscilloscope calibrator
voltage in the Performance Test Record (see page 63).
2000/3000 X-Series Oscilloscopes Service Guide 33
2 Testing Performance
Before proceeding to the next step, make sure that you
have recorded the oscilloscope calibrator voltage levels for
each of the threshold settings shown in Table 5.
9 When testing 3000 X-Series MSOs, use the 8- by- 2 test
connector to connect digital channels D15- D8 to the
output of the oscilloscope calibrator. Then connect the
D15-D8 ground lead to the ground side of the 8-by-2
connector.
10 Repeat this procedure (steps 6 through 8) for digital
channels D15- D8 to verify threshold accuracy and record
the threshold levels in the Performance Test Record (see
page 63). Be sure to set the thresholds with the User
softkey for the appropriate set of channels.
34 2000/3000 X-Series Oscilloscopes Service Guide
To verify DC vertical gain accuracy
This test verifies the accuracy of the analog channel DC
vertical gain for each channel.
In this test, you will measure the dc voltage output of an
oscilloscope calibrator using the oscilloscope’s
Average - Full Screen voltage measurement and compare the
results with the multimeter reading.
Tabl e 6 DC Vertical Gain Accuracy Test Limits
Models Test Limits Notes
Testing Performance 2
2000 X-Series ±3% of full scale (>= 10 mV/div);
±4% of full scale (< 10 mV/div)
3000 X-Series ±2.0% of full scale
• Full scale is defined as 32 mV on the 2 mV/div range
and the 1 mV/div range.
• Full scale on all other ranges is defined as 8 divisions
times the V/div setting.
2000/3000 X-Series Oscilloscopes Service Guide 35
2 Testing Performance
Tabl e 7 Equipment Required to Verify DC Vertical Gain Accuracy
Recommended
Equipment Critical Specifications
Model/Part
Oscilloscope
Calibrator
Digital multimeter Better than 0.01% accuracy Agilent 34401A
Cable BNC, Qty 2 Agilent 10503A
Shorting cap BNC Agilent 1250-0774
Adapter BNC (f) to banana (m) Agilent 1251-2277
Adapter BNC tee (m) (f) (f) Agilent 1250-0781 or
Blocking capacitor Agilent 11742A +
1 Press [Save/Recall] > Default/Erase > Factory Default to recall
the factory default setup.
14 mV to 35 Vdc,
0.1 V resolution
Fluke 5820A
Pomona 3285
Pomona 4288 +
Pomona 5088
2 If you are testing a 2000 X-Series oscilloscope, set the
probe attenuation to 1:1 on the analog channel you are
testing (for example, [1] > Probe > Probe; then, turn the
Entry knob to select 1.00 : 1).
3 Set up the oscilloscope.
a Adjust the horizontal scale to 10.00 ms/div.
b Set the Volts/Div setting to the value in the first line in
Table 8 or Table 9 (depending on the oscilloscope
model).
c Adjust the channel’s vertical position knob to place the
baseline (reference level) at 0.5 major division from the
bottom of the display.
36 2000/3000 X-Series Oscilloscopes Service Guide
Testing Performance 2
Tabl e 8 Settings Used to Verify DC Vertical Gain Accuracy,
2000 X-Series Models
Volts/Div
Setting
5V/Div 35V 33.8V to 36.2V
2 V/Div 14 V 13.52 V to 14.48 V
1V/Div 7V 6.76V to 7.24V
500 mV/Div 3.5 V 3.38 V to 3.62 V
200 mV/Div 1.4 V 1.352 V to 1.448 V
100 mV/Div 700 mV 676 mV to 724 mV
50 mV/Div 350 mV 338 mV to 362 mV
20 mV/Div 140 mV 135.2 mV to 144.8 mV
10 mV/Div 70 mV 67.6 mV to 72.4 mV
5mV/Div
2mV/Div
1mV/Div
1
A blocking capacitor is required at this range to reduce noise. See “Use a
Blocking Capacitor to Reduce Noise” on page 41.
2
Full scale is defined as 32 mV on the 2 mV/div and the 1 mV/div range. Full
scale on all other ranges is defined as 8 divisions times the V/div setting.
1
1, 2
1, 2
Oscilloscope
Calibrator Setting
35 mV 33.4 mV to 36.6 mV
14 mV 12.72 mV to 15.28 mV
7mV 5.72mV to 8.28mV
Test L imi ts
2000/3000 X-Series Oscilloscopes Service Guide 37
2 Testing Performance
Tabl e 9 Settings Used to Verify DC Vertical Gain Accuracy,
3000 X-Series Models
Volts/Div
Setting
5V/Div 35V 34.2V to 35.8V
2 V/Div 14 V 13.68 V to 14.32 V
1V/Div 7V 6.84V to 7.16V
500 mV/Div 3.5 V 3.42 V to 3.58 V
200 mV/Div 1.4 V 1.368 V to 1.432 V
100 mV/Div 700 mV 684 mV to 716 mV
50 mV/Div 350 mV 342 mV to 358 mV
20 mV/Div 140 mV 136.8 mV to 143.2 mV
10 mV/Div 70 mV 68.4 mV to 71.6 mV
5mV/Div
2mV/Div
1mV/Div
1
A blocking capacitor is required at this range to reduce noise. See “Use a
Blocking Capacitor to Reduce Noise” on page 41.
2
Full scale is defined as 32 mV on the 2 mV/div range and the 1 mV/div range.
Full scale on all other ranges is defined as 8 divisions times the V/div setting.
1
1, 2
1, 2
Oscilloscope
Calibrator Setting
35 mV 34.2 mV to 35.8 mV
14 mV 13.36 mV to 14.64 mV
7mV 6.36mV to 7.64mV
Test L imi ts
d Press the [Acquire] key.
e Then press the Acq Mode softkey and select Averaging.
f Then press the #Avgs softkey and set it to 64.
Wait a few seconds for the measurement to settle.
4 Add a measurement for the average voltage:
a Press the [Meas] key.
b Press Source; then, turn the Entry knob (labeled
on the front panel) to select the channel you are
testing.
38 2000/3000 X-Series Oscilloscopes Service Guide
Oscilloscope
Oscilloscope
Calibrator
Digital
Multimeter
BNC Tee
BNC (f) to dual
bananna adapter
Testing Performance 2
c Press Ty p e :; then, turn the Entry knob to select
Average - Full Screen, and press Add Measurement.
5 Read the “current” average voltage value as V1.
6 Use the BNC tee and cables to connect the oscilloscope
calibrator /power supply to both the oscilloscope and the
multimeter (see Figure 3).
Figure 3 Setting up Equipment for DC Vertical Gain Accuracy Test
2000/3000 X-Series Oscilloscopes Service Guide 39
2 Testing Performance
7 Adjust the output so that the multimeter reading displays
the first Volts/div calibrator setting value in Table 8 or
Table 9 (depending on the oscilloscope model).
8 Disconnect the multimeter.
9 Wait until the measurement settles.
10 Read the “current” average voltage value again as V2.
11 Calculate the difference V2 - V1.
The difference in average voltage readings should be
within the test limits of Table 8 or Table 9 (depending on
the oscilloscope model).
If a result is not within the test limits, go to the
“Troubleshooting” chapter. Then return here.
12 Disconnect the oscilloscope calibrator from the
oscilloscope.
13 Repeat this procedure to check the DC vertical gain
accuracy with the remaining Volts/div setting values in
Table 8 or Table 9 (depending on the oscilloscope model).
14 Finally, repeat this procedure for the remaining channels
to be tested.
40 2000/3000 X-Series Oscilloscopes Service Guide
Testing Performance 2
To oscilloscope input
BNC shorting
cap
Blocking
Capacitor
Use a Blocking Capacitor to Reduce Noise
On the more sensitive ranges, such as 1 mV/div, 2 mV/div,
and 5 mV/div, noise may be a factor. To eliminate the noise,
add a BNC Tee, blocking capacitor, and shorting cap at the
oscilloscope channel input to shunt the noise to ground. See
Figure 4. If a BNC capacitor is not available, use an SMA
blocking capacitor, adapter, and cap. See “Blocking capacitor
and shorting cap” in the equipment list on page 26 for
details.
Figure 4 Using a Blocking Capacitor to Reduce Noise
2000/3000 X-Series Oscilloscopes Service Guide 41
2 Testing Performance
To verify dual cursor accuracy
This test verifies the dual cursor accuracy for each analog
channel.
This test is similar to the test for verifying the DC vertical
gain, except you will measure the dc voltage output of an
oscilloscope calibrator using dual cursors on the oscilloscope
and compare the results with the multimeter reading.
Dual cursor accuracy test limits: ±[DC vertical gain accuracy
+ 0.5% full scale]
For the DC vertical gain accuracy test limits, see Table 6 on
page 35.
42 2000/3000 X-Series Oscilloscopes Service Guide
Testing Performance 2
Tabl e 10 Equipment Required to Verify Dual Cursor Accuracy
Recommended
Equipment Critical Specifications
Model/Part
Oscilloscope
Calibrator
Digital multimeter Better than 0.01% accuracy Agilent 34401A
Cable BNC, Qty 2 Agilent 10503A
Shorting cap BNC Agilent 1250-0774
Adapter BNC (f) to banana (m) Agilent 1251-2277
Adapter BNC tee (m) (f) (f) Agilent 1250-0781 or
Blocking capacitor Agilent 11742A +
14 mV to 35 Vdc,
0.1 V resolution
Fluke 5820A
Pomona 3285
Pomona 4288 +
Pomona 5088
1 Press [Save/Recall] > Default/Erase > Factory Default to recall
the factory default setup.
2 If you are testing a 2000 X-Series oscilloscope, set the
probe attenuation to 1:1 on the analog channel you are
testing (for example, [1] > Probe > Probe; then, turn the
Entry knob to select 1.00 : 1).
3 Set up the oscilloscope.
a Set the Volts/Div setting to the value in the first line in
Table 11 or Table 12 (depending on the oscilloscope
model).
b Adjust the channel 1 position knob to place the
baseline at 0.5 major division from the bottom of the
display.
2000/3000 X-Series Oscilloscopes Service Guide 43
2 Testing Performance
Tabl e 11 Settings Used to Verify Dual Cursor Accuracy, 2000 X-Series
Models
Volts/Div
Setting
5V/Div 35V 33.6V to 36.4V
2 V/Div 14 V 13.44 V to 14.56 V
1V/Div 7V 6.72V to 7.28V
500 mV/Div 3.5 V 3.36 V to 3.64 V
200 mV/Div 1.4 V 1.344 V to 1.456 V
100 mV/Div 700 mV 672 mV to 728 mV
50 mV/Div 350 mV 336 mV to 364 mV
20 mV/Div 140 mV 134.4 mV to 145.6 mV
10 mV/Div 70 mV 67.2 mV to 72.8 mV
5mV/Div
2mV/Div
1mV/Div
1
A blocking capacitor is required at this range to reduce noise. See “Use a
Blocking Capacitor to Reduce Noise” on page 48.
2
Full scale is defined as 32 mV on the 2 mV/div range and the 1 mV/div range.
Full scale on all other ranges is defined as 8 divisions times the V/div setting.
1
1, 2
1, 2
Oscilloscope
Calibrator Setting
35 mV 33.2 mV to 36.8 mV
14 mV 12.56 mV to 15.44 mV
7mV 5.56mV to 8.44mV
Test L imi ts
44 2000/3000 X-Series Oscilloscopes Service Guide
Testing Performance 2
Tabl e 12 Settings Used to Verify Dual Cursor Accuracy, 3000 X-Series
Models
Volts/Div
Setting
5V/Div 35V 34.0V to 36.0V
2V/Div 14V 13.6V to 14.4V
1V/Div 7V 6.8V to 7.2V
500 mV/Div 3.5 V 3.4 V to 3.6 V
200 mV/Div 1.4 V 1.36 V to 1.44 V
100 mV/Div 700 mV 680 mV to 720 mV
50 mV/Div 350 mV 340 mV to 360 mV
20 mV/Div 140 mV 136 mV to 144 mV
10 mV/Div 70 mV 68 mV to 72 mV
5mV/Div
2mV/Div
1mV/Div
1
A blocking capacitor is required at this range to reduce noise. See “Use a
Blocking Capacitor to Reduce Noise” on page 48.
2
Full scale is defined as 32 mV on the 2 mV/div range and the 1 mV/div range.
Full scale on all other ranges is defined as 8 divisions times the V/div setting.
1
1, 2
1, 2
Oscilloscope
Calibrator Setting
35 mV 34 mV to 36 mV
14 mV 13.2 mV to 14.8 mV
7mV 6.2mV to 7.8mV
Test L imi ts
c Press the [Acquire] key.
d Then press the Acq Mode softkey and select Averaging.
e Then press the #Avgs softkey and set it to 64.
Wait a few seconds for the measurement to settle.
4 Press the [Cursors] key, set the Mode softkey to Normal,
then press the XY softkey and select Y. Press the Y1
softkey, then use the Entry knob (labeled on the
front panel) to set the Y1 cursor on the baseline of the
signal.
2000/3000 X-Series Oscilloscopes Service Guide 45
2 Testing Performance
Oscilloscope
Oscilloscope
Calibrator
Digital
Multimeter
BNC Tee
BNC (f) to dual
bananna adapter
5 Use the BNC tee and cables to connect the oscilloscope
calibrator /power supply to both the oscilloscope and the
multimeter (see Figure 5).
46 2000/3000 X-Series Oscilloscopes Service Guide
Figure 5 Setting up Equipment for Dual Cursor Accuracy Test
6 Adjust the output so that the multimeter reading displays
the first Volts/div calibrator setting value in Table 11 or
Table 12 (depending on the oscilloscope model).
7 Disconnect the multimeter.
8 Wait until the measurement settles.
Testing Performance 2
9 Press the Y2 softkey, then position the Y2 cursor to the
center of the voltage trace using the Entry knob.
The ΔY value on the lower line of the display should be
within the test limits of Table 11 or Table 12 (depending
on the oscilloscope model).
If a result is not within the test limits, go to the
“Troubleshooting” chapter. Then return here.
10 Disconnect the oscilloscope calibrator from the
oscilloscope.
11 Repeat this procedure to check the dual cursor accuracy
with the remaining Volts/div setting values in Table 11 or
Table 12 (depending on the oscilloscope model).
12 Finally, repeat this procedure for the remaining channels
to be tested.
2000/3000 X-Series Oscilloscopes Service Guide 47
2 Testing Performance
To oscilloscope input
BNC shorting
cap
Blocking
Capacitor
Use a Blocking Capacitor to Reduce Noise
On the more sensitive ranges, such as 1 mV/div, 2 mV/div,
and 5 mV/div, noise may be a factor. To eliminate the noise,
add a BNC Tee, blocking capacitor, and shorting cap at the
oscilloscope channel input to shunt the noise to ground. See
Figure 6. If a BNC capacitor is not available, use an SMA
blocking capacitor, adapter, and cap. See “Blocking capacitor
and shorting cap” in the equipment list on page 26 for
details.
Figure 6 Using a Blocking Capacitor to Reduce Noise
48 2000/3000 X-Series Oscilloscopes Service Guide
To verify bandwidth (-3 dB)
This test checks the bandwidth (- 3 dB) of the oscilloscope.
In this test you will use a signal generator and a power
meter.
Tabl e 13 Bandwidth (-3 dB) Test Limits
Models Test Limits
1 GHz Models All channels (-3 dB), dc to 1 GHz
500 MHz Models All channels (-3 dB), dc to 500 MHz
350 MHz Models All channels (-3 dB), dc to 350 MHz
200 MHz Models All channels (-3 dB), dc to 200 MHz
100 MHz Models All channels (-3 dB), dc to 100 MHz
Testing Performance 2
70 MHz Models All channels (-3 dB), dc to 70 MHz
2000/3000 X-Series Oscilloscopes Service Guide 49
2 Testing Performance
Tabl e 14 Equipment Required to Verify Bandwidth (-3 dB)
Recommended
Equipment Critical Specifications
Signal Generator 100 kHz - 1 GHz at 200 mVrms Agilent N5181A
Power Meter 1 MHz - 1 GHz ±3% accuracy Agilent N1914A
Power Sensor 1 MHz - 1 GHz ±3% accuracy Agilent E9304A or
Power Splitter outputs differ by < 0.15 dB Agilent 11667A
Cable Type N (m) 24 inch Agilent 11500B
Adapter Type N (m) to BNC (m) Agilent 1250-0082 or
Model/Part
N8482A
Pomona 3288 with
Pomona 3533
50 Ohm Feedthrough
Termination
1 Connect the equipment (see Figure 7).
Ω BNC (f) to BNC (m),
50
when testing
oscilloscopes
2000 X-Series
Agilent 0960-0301
a Use the N cable to connect the signal generator to the
input of the power splitter input.
b Connect the power sensor to one output of the power
splitter.
c Use an N- to- BNC adapter to connect the other splitter
output to the channel 1 input.
50 2000/3000 X-Series Oscilloscopes Service Guide
Oscilloscope
Testing Performance 2
Signal
Generator
N to BNC Adapter
Power Splitter
Power Sensor
N Cable
Power
Meter
Figure 7 Setting Up Equipment for Bandwidth (-3 dB) Verification Test
2 Set up the power meter.
Set the power meter to display measurements in units of
watts.
3 Set up the oscilloscope.
a Press the [Default Setup] key.
b Set channel 1 Coupling to DC.
2000/3000 X-Series Oscilloscopes Service Guide 51
2 Testing Performance
Vin
1MHz
Pmeas
1MHz
50Ω×=
c With 2000 X-Series oscilloscopes, connect a 50 ohm
feedthrough termination.
With 3000 X- Series oscilloscopes, set channel 1 Imped
to 50 Ohm.
d Set the time base to 500 ns/div.
e Set the Volts/Div for channel 1 to 200 mV/div.
f Press the [Acquire] key, then press the Averaging softkey.
g Turn the Entry knob to set # Avgs to 8 averages.
4 Set the signal generator for 1 MHz and six divisions of
amplitude.
The signal on the oscilloscope screen should be about five
cycles at six divisions amplitude.
5 Set up the Amplitude measurement
a Press the [Meas] key.
b Press the Clear Meas softkey and then the Clear All
softkey.
c Press the Ty p e: softkey and use the Entry knob to select
AC RMS - Full Screen (Std Deviation) within the select menu.
d Press the Add Measurement softkey.
6 Note the oscilloscope AC RMS - FS(1) reading at the
bottom of the screen. (This is the RMS value with any dc
offset removed.)
7 Set the power meter Cal Factor % to the 1 MHz value on
the calibration chart on the power sensor.
8 Note the reading on the power meter and covert to Vrms
using the expression:
For example, if the power meter reading is 892 uW, then
Vin
52 2000/3000 X-Series Oscilloscopes Service Guide
= (892*10-6 * 50Ω)
1MHz
1/2
= 211.2 mV
rms
.
Testing Performance 2
Vin
maxfreq
Pmeas
maxfreq
50Ω×=
response(dB) = 20 log
10
MHz 1 MHz 1
freqmax freqmax
Vin / Vout
Vin / Vout
9 Change the signal generator output frequency according to
the maximum frequency for the oscilloscope using the
following:
• 1GHz Models: 1GHz
• 500 MHz Models: 500 MHz
• 350 MHz Models: 350 MHz
• 200 MHz Models: 200 MHz
• 100 MHz Models: 100 MHz
• 70 MHz Models: 70 MHz
10 Referencing the frequency from step 9, set the power
meter Cal Factor % to the frequency value on the
calibration chart on the power sensor.
11 Set the oscilloscope sweep speed according to the
following:
• 1 GHz Models: 500 ps/div
• 500 MHz Models: 1 ns/div
• 350 MHz Models: 2 ns/div
• 200 MHz Models: 2 ns/div
• 100 MHz Models: 5 ns/div
• 70 MHz Models: 5 ns/div
12 Note the oscilloscope Std Dev(1) reading at the bottom of
the screen.
13 Note the reading on the power meter and covert to Vrms
using the expression:
2000/3000 X-Series Oscilloscopes Service Guide 53
14 Calculate the response using the expression:
Example If:
Pmeas
Std Dev(n)
1_MHz
= 892 uW
= 210.4 mV
1MHz
2 Testing Performance
response(dB) = 20 log
10
mV 185.3 / mV 161.6
= -1.16 dB
Pmeas
Std Dev(n)
Then after converting the values from the power meter to
Vrms:
max_freq
= 687 uW
max freq
= 161.6 mV
mV 211.2mV/ 210.4
15 The result from step 14 should be between +3.0 dB and
- 3.0 dB. Record the result in the Performance Test Record
(see page 63).
16 Move the power splitter from the channel 1 to the channel
2 input.
17 Turn off the current channel and turn on the next
channel using the channel keys.
18 Repeat steps 3 through 17 for the remaining channels,
setting the parameters of the channel being tested where
appropriate.
54 2000/3000 X-Series Oscilloscopes Service Guide
To verify time base accuracy
This test verifies the accuracy of the time base. In this test
you will measure the absolute error of the time base
oscillator and compare the results to the specification.
Tabl e 15 Equipment Required to Verify Time Base Accuracy
Equipment Critical Specifications
Testing Performance 2
Recommended
Model/Part
Signal Generator 100 kHz - 1 GHz, 0.01 Hz
frequency resolution,
jitter: < 2ps
Cable BNC, 3 feet Agilent 10503A
50 Ohm Feedthrough
Termination
1 Set up the signal generator.
a Set the output to 10 MHz, approximately 1 V
wave.
2 Connect the output of the signal generator to oscilloscope
channel 1 using the BNC cable. When testing
2000 X-Series oscilloscopes, also connect a 50 ohm
feedthrough termination between the channel 1 input and
the BNC cable.
3 Set up the oscilloscope:
a Press [AutoScale].
b Set the oscilloscope Channel 1 vertical sensitivity to
200 mv/div.
c Set the oscilloscope horizontal sweep speed control to
5ns/div.
d Adjust the intensity to get a sharp, clear trace.
Ω BNC (f) to BNC (m),
50
when testing
oscilloscopes
2000 X-Series
Agilent N5181A
Agilent 0960-0301
sine
pp
2000/3000 X-Series Oscilloscopes Service Guide 55
2 Testing Performance
Date Code:
0747
07 = Year
47 = Week
e Adjust the oscilloscope’s trigger level so that the rising
edge of the waveform at the center of the screen is
located where the center horizontal and vertical grid
lines cross (center screen).
f Ensure the horizontal position control is set to
0.0 seconds.
4 Make the measurement.
a Set oscilloscope horizontal sweep speed control to
1ms/div.
b Set horizontal position control to +1 ms (rotate control
CCW).
c Set the oscilloscope horizontal sweep speed control to
5ns/div.
d Record the number of nanoseconds from where the
rising edge crosses the center horizontal grid line to
the center vertical grid line. The number of
nanoseconds is equivalent to the time base error in
ppm.
e Use the date code on the oscilloscope’s serial tag to
calculate the number of years since manufacture.
Include any fractional portion of a year.
f Use the following formula to calculate the test limits.
Time base accuracy limit: 25 ppm ±5 ppm per year
(aging)
g Record the result and compare it to the limits in the
Performance Test Record (see page 63).
56 2000/3000 X-Series Oscilloscopes Service Guide
To verify trigger sensitivity
This test verifies the trigger sensitivity. In this test, you will
apply a sine wave to the oscilloscope at the upper
bandwidth limit. You will then decrease the amplitude of the
signal to the specified levels, and check to see if the
oscilloscope is still triggered.
Test limits for:
• Internal trigger sensitivity on all models:
• < 10 mV/div: greater of 1 div or 5 mV
• >= 10 mV/div: 0.6 div
• External trigger sensitivity on all models:
• DC to 100 MHz: < 200 mV
• 100 MHz - 200 MHz: < 350 mV
Tabl e 16 Equipment Required to Verify Trigger Sensitivity
Testing Performance 2
pp
pp
pp
Equipment Critical Specifications Recommended Model/Part
Signal
Generator
Power splitter Outputs differ < 0.15 dB Agilent 11667A
Power Meter Agilent N1914A
Power Sensor Agilent E9304A or N8482A
Cable BNC, Qty 3 Agilent 10503A
Adapter N (m) to BNC (f), Qty 3 Agilent 1250-0780
Feedthrough 50
25 MHz, 100 MHz, 350 MHz,
500MHz, and 1GHz sine
waves
Agilent N5181A
Ω BNC (f) to BNC (m) Agilent 0960-0301
2000/3000 X-Series Oscilloscopes Service Guide 57
2 Testing Performance
Test Internal Trigger Sensitivity (all models)
1 On the oscilloscope, press the [Default Setup] key.
2 Press the [Mode/Coupling] key; then, press the Mode
softkey to select Normal.
3 Connect the equipment (see Figure 8).
a Connect the signal generator output to the oscilloscope
channel 1 input.
Oscilloscope
Signal
Generator
N to BNC Adapter
N Cable
Figure 8 Setting Up Equipment for Internal Trigger Sensitivity Test
b With 2000 X- Series oscilloscopes, connect a 50 ohm
feedthrough termination between the channel 1 input
and the BNC cable.
With 3000 X- Series oscilloscopes, set channel 1 Imped
to 50 Ohm.
4 To verify the trigger sensitivity at the oscilloscope’s
maximum bandwidth, set the output frequency of the
58 2000/3000 X-Series Oscilloscopes Service Guide
Testing Performance 2
signal generator to the maximum bandwidth of the
oscilloscope:
• 1 GHz models: 1 GHz.
• 500 MHz models: 500 MHz.
• 350 MHz models: 350 MHz.
• 200 MHz models: 200 MHz.
• 100 MHz models: 100 MHz.
• 70 MHz models: 70 MHz.
5 Perform these steps to test at the 5 mV/div setting:
a Set the signal generator amplitude to about 10 mV
b Press the [AutoScale] key.
c Set the time base to 10 ns/div.
d Set channel 1 to 5 mV/div.
e Decrease the amplitude from the signal generator until
1 vertical division of the signal (about 5 mV
displayed.
The trigger is stable when the displayed waveform is
stable. If the trigger is not stable, try adjusting the
trigger level. If adjusting the trigger level makes the
trigger stable, the test still passes. If adjusting the
trigger does not help, see the “Troubleshooting” chapter.
Then return here.
f Record the result as Pass or Fail in the Performance
Test Record (see page 63).
g Repeat this step for the remaining oscilloscope
channels.
6 Perform these steps to test at the 10 mV/div setting:
a Set the signal generator amplitude to about 20 mV
b Press the [AutoScale] key.
c Set the time base to 10 ns/div.
d Set channel 1 to 10 mV/div.
e Decrease the amplitude from the signal generator until
0.6 vertical divisions of the signal (about 6 mV
displayed.
pp
) is
pp
pp
pp
) is
.
.
2000/3000 X-Series Oscilloscopes Service Guide 59
2 Testing Performance
Test External Trigger Sensitivity
The trigger is stable when the displayed waveform is
stable. If the trigger is not stable, try adjusting the
trigger level. If adjusting the trigger level makes the
trigger stable, the test still passes. If adjusting the
trigger does not help, see the “Troubleshooting” chapter.
Then return here.
f Record the result as Pass or Fail in the Performance
Test Record (see page 63).
g Repeat this step for the remaining oscilloscope
channels.
This test applies to all models.
Verify the external trigger sensitivity at these settings:
• 100 MHz, 200 mV
• 200 MHz, 350 mV
1 Connect the equipment (see Figure 9).
a Use the N cable to connect the signal generator to the
power splitter input.
b Connect one output of the power splitter to the Aux
Trig input through a 50Ω feedthrough termination.
c Connect the power sensor to the other output of the
power splitter.
pp
pp
60 2000/3000 X-Series Oscilloscopes Service Guide
Oscilloscope
50 Ohm Feedthrough
N to BNC Adapter
Testing Performance 2
Signal
Generator
Power Splitter
Power Sensor
N Cable
Power
Meter
Figure 9 Setting Up Equipment for 4-Channel External Trigger Sensitiv-
ity Test
2000/3000 X-Series Oscilloscopes Service Guide 61
2 Testing Performance
2 Set up the oscilloscope.
a Press the [Default Setup] key.
b Press the [Mode/Coupling] key; then, press the Mode
softkey to select Normal.
3 Change the signal generator output frequency to 100 MHz
or 200 MHz.
4 Set the power meter Cal Factor % to the appropriate
value (100 MHz or 200 MHz) on the calibration chart on
the power sensor. If necessary, do a linear interpolation if
a 100 MHz or 200 MHz factor is not included in the
power meter’s calibration chart.
5 Adjust the signal generator output for reading on the
power meter of:
Signal Generator
Frequency Calculation
100 MHz 200 mV
200 MHz 350 mVpp= 123.74 mV rms,
Power = Vin2/50Ω = 70.71 mV2/50Ω
Power = Vin2/50Ω = 123.74 mV2/50Ω
= 70.71 mV rms,
pp
Power Meter
Reading
100 μW
306 μW
6 Press the [Trigger] key, then press the Source softkey to set
the trigger source to External.
7 Check for stable triggering and adjust the trigger level if
necessary. Triggering is indicated by the Trig’d indicator at
the top of the display. When it is flashing, the
oscilloscope is not triggered. When it is not flashing, the
oscilloscope is triggered.
8 Record the results as Pass or Fail in the Performance Test
Record (see page 63).
If the test fails, see the “Troubleshooting” chapter. Then
return here.
62 2000/3000 X-Series Oscilloscopes Service Guide
Testing Performance 2
Agilent 2000 X-Series Oscilloscopes Performance Test Record
Serial No. ______________________________________ Test by _____________________________
Test Interval ____________________________________ Work Order No. ______________________
Recommended Next Testing ________________________ Temperature ____________
Threshold Specification Limits Ch D7-D0
Accuracy Test 5 V - 250 mV 4.750 V ________
(100 mV + 3% of
threshold setting)
DC Vertical Gain Accuracy
Range Power Supply Setting Test Limits Channel 1 Channel 2 Channel 3* Channel 4*
5 V/Div 35 V 33.8 V to 36.2 V ________ ________ ________ ________
2 V/Div 14 V 13.52 V to 14.48 V ________ ________ ________ ________
1 V/Div 7 V 6.76 V to 7.24 V ________ ________ ________ ________
500 mV/Div 3.5 V 3.38 V to 3.62 V ________ ________ ________ ________
200 mV/Div 1.4 V 1.352 V to 1.448 V ________ ________ ________ ________
100 mV/Div 700 mV 676 mV to 724 mV ________ ________ ________ ________
50 mV/Div 350 mV 338 mV to 362 mV ________ ________ ________ ________
20 mV/Div 140 mV 135.2 mV to 144.8 mV ________ ________ ________ ________
10 mV/Div 70 mV 67.6 mV to 72.4 mV ________ ________ ________ ________
5 mV/Div 35 mV 33.4 mV to 36.6 mV ________ ________ ________ ________
2 mV/Div 14 mV 12.72 mV to 15.28 mV ________ ________ ________ ________
1 mV/Div 7 mV 5.72 mV to 8.28 mV ________ ________ ________ ________
5 V + 250 mV 5.250 V ________
-5 V - 250 mV -5.250 V ________
-5 V + 250 mV -4.750 V ________
0 V - 100 mV -100 mV ________
0 V + 100 mV 100 mV ________
Continued on next page.
2000/3000 X-Series Oscilloscopes Service Guide 63
2 Testing Performance
Dual Cursor Accuracy
Range Power Supply Setting Test Limits Channel 1 Channel 2 Channel 3* Channel 4*
5 V/Div 35 V 33.6 V to 36.4 V ________ ________ ________ ________
2 V/Div 14 V 13.44 V to 14.56 V ________ ________ ________ ________
1 V/Div 7 V 6.72 V to 7.28 V ________ ________ ________ ________
500 mV/Div 3.5 V 3.36 V to 3.64 V ________ ________ ________ ________
200 mV/Div 1.4 V 1.344 V to 1.456 V ________ ________ ________ ________
100 mV/Div 700 mV 672 mV to 728 mV ________ ________ ________ ________
50 mV/Div 350 mV 336 mV to 364 mV ________ ________ ________ ________
20 mV/Div 140 mV 134.4 mV to 145.6 mV ________ ________ ________ ________
10 mV/Div 70 mV 67.2 mV to 72.8 mV ________ ________ ________ ________
5 mV/Div 35 mV 33.2 mV to 36.8 mV ________ ________ ________ ________
2 mV/Div 14 mV 12.56 mV to 15.44 mV ________ ________ ________ ________
1 mV/Div 7 mV 5.56 mV to 8.44 mV ________ ________ ________ ________
Bandwidth (-3 dB) Model Test Limits Channel 1 Channel 2 Channel 3* Channel 4*
202x -3 dB at 200 MHz ________ ________ ________ ________
201x -3 dB at 100 MHz ________ ________ ________ ________
200x -3 dB at 70 MHz ________ ________ ________ ________
Time Base Accuracy Limits Calculated
time base
accuracy
limit (ppm)
Measured
time base
error
(ppm)
Pass/Fail
Time Base Accuracy Limit: 25 ppm ±5 ppm per year
(aging)
Internal Trigger Sensitivity
Generator Setting Test Limits Channel 1 Channel 2 Channel 3* Channel 4*
200 MHz models:
100 MHz models:
70 MHz models:
External Trigger Sensitivity
* Where applicable
200 MHz
100 MHz
70 MHz
Generator Setting Test Limits Ext Trig In
200 MHz 350 mV ________
100 MHz 200 mV ________
< 10 mV/div: greater of 1 div
or 5 mVpp
>= 10 mV/div: 0.6 div ________ ________ ________ _______
_________ ________ ________
________ ________ ________ _______
64 2000/3000 X-Series Oscilloscopes Service Guide
Testing Performance 2
Agilent 3000 X-Series Oscilloscopes Performance Test Record
Serial No. ______________________________________ Test by _____________________________
Test Interval ____________________________________ Work Order No. ______________________
Recommended Next Testing ________________________ Temperature ____________
Threshold Specification Limits Ch D7-D0 Ch D15-D8
Accuracy Test 5 V - 250 mV 4.750 V ________ ________
(100 mV + 3% of
threshold setting)
DC Vertical Gain Accuracy
Range Power Supply Setting Test Limits Channel 1 Channel 2 Channel 3* Channel 4*
5 V/Div 35 V 34.2 V to 35.8 V ________ ________ ________ ________
2 V/Div 14 V 13.68 V to 14.32 V ________ ________ ________ ________
1 V/Div 7 V 6.84 V to 7.16 V ________ ________ ________ ________
500 mV/Div 3.5 V 3.42 V to 3.58 V ________ ________ ________ ________
200 mV/Div 1.4 V 1.368 V to 1.432 V ________ ________ ________ ________
100 mV/Div 700 mV 684 mV to 716 mV ________ ________ ________ ________
50 mV/Div 350 mV 342 mV to 358 mV ________ ________ ________ ________
20 mV/Div 140 mV 136.8 mV to 143.2 mV ________ ________ ________ ________
10 mV/Div 70 mV 68.4 mV to 71.6 mV ________ ________ ________ ________
5 mV/Div 35 mV 34.2 mV to 35.8 mV ________ ________ ________ ________
2 mV/Div 14 mV 13.36 mV to 14.64 mV ________ ________ ________ ________
1 mV/Div 7 mV 6.36 mV to 7.64 mV ________ ________ ________ ________
5 V + 250 mV 5.250 V ________ ________
-5 V - 250 mV -5.250 V ________ ________
-5 V + 250 mV -4.750 V ________ ________
0 V - 100 mV -100 mV ________ ________
0 V + 100 mV 100 mV ________ ________
Continued on next page.
2000/3000 X-Series Oscilloscopes Service Guide 65
2 Testing Performance
Dual Cursor Accuracy
Range Power Supply Setting Test Limits Channel 1 Channel 2 Channel 3* Channel 4*
5 V/Div 35 V 34.0 V to 36.0 V ________ ________ ________ ________
2 V/Div 14 V 13.6 V to 14.4 V ________ ________ ________ ________
1 V/Div 7 V 6.8 V to 7.2 V ________ ________ ________ ________
500 mV/Div 3.5 V 3.4 V to 3.6 V ________ ________ ________ ________
200 mV/Div 1.4 V 1.36 V to 1.44 V ________ ________ ________ ________
100 mV/Div 700 mV 680 mV to 720 mV ________ ________ ________ ________
50 mV/Div 350 mV 340 mV to 360 mV ________ ________ ________ ________
20 mV/Div 140 mV 136 mV to 144 mV ________ ________ ________ ________
10 mV/Div 70 mV 68 mV to 72 mV ________ ________ ________ ________
5 mV/Div 35 mV 34 mV to 36 mV ________ ________ ________ ________
2 mV/Div 14 mV 13.2 mV to 14.8 mV ________ ________ ________ ________
1 mV/Div 7 mV 6.2 mV to 7.8 mV ________ ________ ________ ________
Bandwidth (-3 dB) Model Test Limits Channel 1 Channel 2 Channel 3* Channel 4*
310x -3 dB at 1 GHz ________ ________ ________ ________
305x -3 dB at 500 MHz ________ ________ ________ ________
303x -3 dB at 350 MHz ________ ________ ________ ________
302x -3 dB at 200 MHz ________ ________ ________ ________
301x -3 dB at 100 MHz ________ ________ ________ ________
Time Base Accuracy Limits Calculated
time base
accuracy
limit (ppm)
Time Base Accuracy Limit: 25 ppm ±5 ppm per year
(aging)
Internal Trigger Sensitivity
Generator Setting Test Limits Channel 1 Channel 2 Channel 3* Channel 4*
1GHz models:
500 MHz models:
350 MHz models:
200 MHz models:
100 MHz models:
External Trigger Sensitivity
* Where applicable
1GHz
350 MHz
200 MHz
100 MHz
Generator Setting Test Limits Ext Trig In
200 MHz 350 mV ________
100 MHz 200 mV ________
< 10 mV/div: greater of 1 div
or 5 mVpp
>= 10 mV/div: 0.6 div ________ ________ ________ _______
_________ ________ ________
________ ________ ________ _______
Measured
time base
error
(ppm)
Pass/Fail
66 2000/3000 X-Series Oscilloscopes Service Guide
Agilent InfiniiVision 2000/3000 X-Series Oscilloscope
WARNING
Service Guide
3
Calibrating and Adjusting
This chapter explains how to adjust the oscilloscope for
optimum operating performance. You should perform
self- calibration according to the following recommendations:
• Every two years or after 4000 hours of operation
• If the ambient temperature is >10 °C from the calibration
temperature
• If you want to maximize the measurement accuracy
The amount of use, environmental conditions, and
experience with other instruments help determine if you
need shorter adjustment intervals.
Let the Equipment Warm Up Before Adjusting
Before you start the adjustments, let the oscilloscope and
test equipment warm up for at least 30 minutes.
Read All Cautions and Warnings
Read the following cautions and warning before making
adjustments or performing self- calibration.
HAZARDOUS VOLTAGES!
Read the safety notice at the front of this book before proceeding.
Maintenance is performed with power supplied to the oscilloscope and with the
protective covers removed. Only trained service personnel who are aware of the
hazards involved should perform the maintenance. Whenever possible, perform the
procedures with the power cord removed from the oscilloscope.
s1
67
3 Calibrating and Adjusting
CAUTION
CAUTION
CAUTION
REMOVE POWER TO AVOID DAMAGE!
Do not disconnect any cables or remove any assemblies with power applied to the
oscilloscope. Otherwise, damage to the oscilloscope can occur.
USE EXTERNAL FAN TO REDUCE TEMPERATURE!
When you must operate the oscilloscope with its cover and main shield removed,
use an external fan to provide continuous air flow over the samplers (the ICs with
heat sinks on them). Air flow over the samplers is reduced when the cover and
main shield is removed, which leads to higher than normal operating temperatures.
Have the fan blow air across the system board where the heat sinks are located. If
the cover is removed but the main shield remains installed and the bottom holes
are not blocked, the instrument will cool properly.
AVOID DAMAGE TO ELECTRONIC COMPONENTS!
Electrostatic discharge (ESD) can damage electronic components. When you use
any of the procedures in this chapter, use proper ESD precautions. As a minimum,
place the oscilloscope on a properly grounded ESD mat and wear a properly
grounded ESD strap.
68 2000/3000 X-Series Oscilloscopes Service Guide
User Calibration
Calibrating and Adjusting 3
Perform user-calibration:
• Every two years or after 4000 hours of operation.
• If the ambient temperature is >10° C from the calibration
temperature.
• If you want to maximize the measurement accuracy.
The amount of use, environmental conditions, and
experience with other instruments help determine if you
need shorter User Cal intervals.
User Cal performs an internal self- alignment routine to
optimize the signal path in the oscilloscope. The routine uses
internally generated signals to optimize circuits that affect
channel sensitivity, offset, and trigger parameters. Disconnect
all inputs and allow the oscilloscope to warm up before
performing this procedure.
Performing User Cal will invalidate your Certificate of
Calibration. If NIST (National Institute of Standards and
Technology) traceability is required perform the procedures
in Chapter 2 in this book using traceable sources.
To perform User Cal
1 Disconnect all inputs from the front and rear panels,
including the digital channels cable on an MSO, and allow
the oscilloscope to warm up before performing this
procedure.
2 Press the rear-panel CAL button to disable calibration
protection..
3 Connect short (12 inch maximum) equal length cables to
each analog channel’s BNC connector on the front of the
oscilloscope. You will need two equal-length cables for a
2000/3000 X-Series Oscilloscopes Service Guide 69
3 Calibrating and Adjusting
Longer cable
To Channel 1
To Channel 2
to TRIG OUT
2- channel oscilloscope or four equal-length cables for a
4- channel oscilloscope.
Use 50Ω RG58AU or equivalent BNC cables when
performing User Cal.
a For a 2- channel oscilloscope, connect a BNC tee to the
equal length cables. Then connect a BNC(f)- to- BNC(f)
(also called a barrel connector) to the tee as shown
below.
Figure 10 User Calibration cable for 2-channel oscilloscope
b For a 4- channel oscilloscope, connect BNC tees to the
equal- length cables as shown below. Then connect a
70 2000/3000 X-Series Oscilloscopes Service Guide
Calibrating and Adjusting 3
Longer cable
to TRIG OUT
To Channel 3
To Channel 2
To Channel 1
To Channel 4
BNC(f)- to- BNC(f) (barrel connector) to the tee as
shown below.
Figure 11 User Calibration cable for 4-channel oscilloscope
4 Connect a BNC cable (40 inches maximum) from the TRIG
OUT connector on the rear panel to the BNC barrel
connector.
5 Press the [Utility] key; then, press the Service softkey.
6 Begin the Self Cal by pressing the Start User Cal softkey.
2000/3000 X-Series Oscilloscopes Service Guide 71
3 Calibrating and Adjusting
User Cal Status
Pressing the User Cal Status softkey displays the following
summary results of the previous User Cal, and the status of
probe calibrations for probes that can be calibrated. Note
that AutoProbes do not need to be calibrated, but InfiniiMax
probes can be calibrated.
Results:
User Cal date:
Change in temperature since last User Cal:
Failure:
Comments:
Probe Cal Status:
72 2000/3000 X-Series Oscilloscopes Service Guide
Agilent InfiniiVision 2000/3000 X-Series Oscilloscope
Service Guide
4
Troubleshooting
Solving General Problems with the Oscilloscope 74
Verifying Basic Operation 77
Troubleshooting Internal Assemblies 83
Read All Cautions and Warnings
Before you begin any troubleshooting, read all Warning and Cautions in the
“Troubleshooting” section.
This chapter begins with “Solving General Problems with the
Oscilloscope”. It tells you what to do in these cases:
• If there is no display.
• If there is no trace display.
• If the trace display is unusual or unexpected.
• If you cannot see a channel.
Next, this chapter describes procedures for “Verifying Basic
Operation” of the oscilloscope:
• To power-on the oscilloscope.
• To perform hardware self test.
• To perform front panel self test.
• To verify default setup.
• To perform an Auto Scale on the Probe Comp signal.
• To compensate passive probes.
Finally, this chapter describes procedures for
“Troubleshooting Internal Assemblies” when performing
s1
73
4 Troubleshooting
assembly- level repair for 350 MHz, 500 MHz, and 1 GHz
bandwidth oscilloscopes:
• To prepare for internal assembly troubleshooting.
• To check the system board power supply test points.
• To check the interboard supply connector voltages.
• To check the line filter board AC output.
• To check the power switch.
• To check the power supply DC output.
• To check the display supplies.
• To check the keyboard supplies.
• To check the fan.
Solving General Problems with the Oscilloscope
This section describes how to solve general problems that
you may encounter while using the Agilent
2000/3000 X-Series oscilloscopes.
After troubleshooting the oscilloscope, if you need to replace
parts, refer to Chapter 6, “Replaceable Parts,” starting on
page 145.
If there is no display
✔ Check that the power cord is firmly seated in the
oscilloscope power receptacle.
✔ Check that the power source is live.
✔ Check that the front- panel power switch is on.
74 2000/3000 X-Series Oscilloscopes Service Guide
✔ If there is still no display, go to the troubleshooting
procedures in this chapter.
If there is no trace display
✔ Check that the Intensity (on the front panel) is adjusted
correctly.
✔ Recall the default setup by pressing [Default Setup]. This
will ensure that the trigger mode is Auto.
✔ Check that the probe clips are securely connected to
points in the circuit under test, and that the ground is
connected.
✔ Check that the circuit under test is powered on.
✔ Press the [AutoScale] key.
✔ Obtain service from Agilent Technologies, if necessary.
Troubleshooting 4
If the trace display is unusual or unexpected
✔ Check that the Horizontal time/division setting is correct
for the expected frequency range of the input signals.
✔ The sampling speed of the oscilloscope depends on the
time/division setting. It may be that when time/division is
set to slower speeds, the oscilloscope is sampling too
slowly to capture all of the transitions on the waveform.
Use peak detect mode.
✔ Check that all oscilloscope probes are connected to the
correct signals in the circuit under test.
✔ Ensure that the probe’s ground lead is securely connected
to a ground point in the circuit under test. For
high- speed measurements, each probe’s individual ground
lead should also be connected to a ground point closest to
the signal point in the circuit under test.
2000/3000 X-Series Oscilloscopes Service Guide 75
4 Troubleshooting
✔ Check that the trigger setup is correct.
✔ A correct trigger setup is the most important factor in
helping you capture the data you desire. See the User’s
Guide for information about triggering.
✔ Check that persistence in the Display menu is turned off,
then press the Clear Display softkey.
✔ Press the [Auto Scale] key.
If you cannot see a channel
✔ Recall the default setup by pressing [Default Setup]. This
will ensure that the trigger mode is Auto.
✔ Check that the oscilloscope probe’s BNC connector is
securely attached to the oscilloscope’s input connector.
✔ Check that the probe clips are securely connected to
points in the circuit under test.
✔ Check that the circuit under test is powered on.
You may have pressed the [Auto Scale] key before an input
signal was available.
Performing the checks listed here ensures that the signals
from the circuit under test will be seen by the
oscilloscope. Perform the remaining checks in this topic to
make sure the oscilloscope channels are on, and to obtain
an automatic setup.
✔ Check that the desired oscilloscope channels are turned
on.
a Press the analog channel key until it is illuminated.
b On models with the MSO option, press the digital
channels [Digital] key until it is illuminated.
✔ Press the [Auto Scale] key to automatically set up all
channels.
76 2000/3000 X-Series Oscilloscopes Service Guide
Verifying Basic Operation
WARNING
To power-on the oscilloscope
1 Connect the power cord to the rear of the oscilloscope,
then to a suitable ac voltage source.
The oscilloscope power supply automatically adjusts for
input line voltages in the range of 100 to 240 VAC. Ensure
that you have the correct line cord (see page 145). The
power cord provided is matched to the country of origin.
AVOID INJURY.
Always operate the oscilloscope with an approved three conductor power cable.
Do not negate the protective action of the three conductor power cable.
Troubleshooting 4
• Press the power switch.
• When the oscilloscope is turned on, the front panel
LEDs will briefly light up in groups from bottom to
top.
• Next the Agilent logo appears on the display.
• Next a message will appear with tips on getting started
using the oscilloscope. At this time you can press any
key to remove the message and view the display. Or
you can wait and the message will automatically
disappear.
• It will take a total of about 20- 30 seconds for the
oscilloscope to go through its basic self test and
power- up routine.
2 Proceed to “To perform hardware self test” on page 78.
2000/3000 X-Series Oscilloscopes Service Guide 77
4 Troubleshooting
To perform hardware self test
Pressing [Utility] > Service > Hardware Self Test performs a series
of internal procedures to verify that the oscilloscope is
operating properly.
It is recommended you run Hardware Self Test:
• After experiencing abnormal operation.
• For additional information to better describe an
oscilloscope failure.
• To verify proper operation after the oscilloscope has been
repaired.
Successfully passing Hardware Self Test does not guarantee
100% of the oscilloscope's functionality. Hardware Self Test
is designed to provide an 80% confidence level that the
oscilloscope is operating properly.
78 2000/3000 X-Series Oscilloscopes Service Guide
To perform front panel self test
Pressing [Utility] > Service > Front Panel Self Test lets you test the
front panel keys and knobs as well as the oscilloscope
display.
Follow the on-screen instructions.
Failures in the front panel self test indicate problems with
the keyboard, keypad, or display.
To verify default setup
The oscilloscope is designed to turn on with the setup from
the last turn on or previous setup.
To recall the default setup:
1 Press the [Default Setup] key.
This returns the oscilloscope to its default settings and
places the oscilloscope in a known operating condition.
The major default settings are:
• Horizontal:
• main mode.
• 100 us/div scale.
• 0s delay.
• center time reference.
• Ver tical:
• Channel 1 on.
• 5V/div scale.
• dc coupling.
• 0V position.
• probe factor to 1.0 if an AutoProbe probe is not
connected to the channel.
• Trigger:
• Edge trigger.
• Auto sweep mode.
• 0 V level.
• channel 1 source.
• dc coupling.
• rising edge slope.
• 40 ns holdoff time.
• Display:
• 20% grid intensity.
• persistence off.
Troubleshooting 4
2000/3000 X-Series Oscilloscopes Service Guide 79
4 Troubleshooting
• Other:
• Acquire mode normal.
• Run/Stop to Run.
• cursor measurements off.
Figure 12 Default setup screen
2 If your screen looks substantially different, replace the
system board.
To perform an Auto Scale on the Probe Comp signal
1 Press the [Default Setup] key. The oscilloscope is now
configured to its default settings.
2 Connect an oscilloscope probe from channel 1 to the Probe
Comp signal terminal on the front panel.
3 Connect the probe’s ground lead to the ground terminal
that is next to the Demo 2 (Probe Comp) terminal.
4 Press [AutoScale].
80 2000/3000 X-Series Oscilloscopes Service Guide
Troubleshooting 4
5 You should see a waveform on the oscilloscope’s display
similar to this:
If you see the waveform, but the square wave is not
shaped correctly as shown above, perform the procedure
“To compensate passive probes” on page 81.
If you do not see the waveform, ensure your power source
is adequate, the oscilloscope is properly powered- on, and
the probe is connected securely to the front- panel analog
channel input BNC and to the Demo 2 (Probe Comp)
terminal.
6 If you still do not see the waveform, use the
troubleshooting flowchart in this chapter to isolate the
problem.
To compensate passive probes
You should compensate your passive probes to match their
characteristics to the oscilloscope’s channels. A poorly
compensated probe can introduce measurement errors.
2000/3000 X-Series Oscilloscopes Service Guide 81
4 Troubleshooting
comp.cdr
Perfectly compensated
Over compensated
Under compensated
1 Perform the procedure “To perform an Auto Scale on the
Probe Comp signal” on page 80
2 Press the channel key to which the probe is connected
([1], [2], etc.).
3 In the Channel Menu, press Probe.
4 In the Channel Probe Menu, press Probe Check; then, follow
the instructions on- screen.
If necessary, use a nonmetallic tool (supplied with the
probe) to adjust the trimmer capacitor on the probe for
the flattest pulse possible.
On the N2862/63/90 probes, the trimmer capacitor is the
yellow adjustment on the probe tip. On other probes, the
trimmer capacitor is located on the probe BNC connector.
82 2000/3000 X-Series Oscilloscopes Service Guide
Figure 13 Example pulses
5 Connect probes to all other oscilloscope channels (channel
2 of a 2- channel oscilloscope, or channels 2, 3, and 4 of a
4- channel oscilloscope).
6 Repeat the procedure for each channel.
The process of compensating the probes serves as a basic
test to verify that the oscilloscope is functional.
Troubleshooting Internal Assemblies
The service policy for 200 MHz and lower bandwidth
oscilloscopes is unit replacement, so there is no internal
assembly troubleshooting for these models.
The service policy for 350 MHz, 500 MHz, and 1 GHz
bandwidth oscilloscopes is assembly level replacement. You
can use the procedures described in this section to help
identify assemblies that need replacement.
Generally, you want to make sure cables to the assembly are
good and properly seated. Then, you check that the assembly
is supplied with the proper power. If cables are good and
the power is good, but the assembly still does not function
properly, it must be replaced.
Troubleshooting 4
If you need parts or assistance from Agilent Technologies to
repair your instrument, go to www.agilent.com and locate
the service facility for your area.
Equipment Required for Troubleshooting Internal Assemblies
The equipment listed in this table is required to troubleshoot
the oscilloscope.
Tabl e 17 Equipment Required to Troubleshoot the Oscilloscope
Equipment Critical Specifications Recommended Model/Part
Digital multimeter Accuracy ±0.05,% 1 mV
resolution
Oscilloscope Capable of measuring ≥
500 MHz signal. 1 M
input impedance.
2000/3000 X-Series Oscilloscopes Service Guide 83
Ω
Agilent 34401A
Agilent
DSO6102A, MSO6102A,
DSO7104A/B, or
MSO7104A/B
4 Troubleshooting
WARNING
WARNING
CAUTION
CAUTION
To prepare for internal assembly troubleshooting
HAZARDOUS VOLTAGES EXIST — REMOVE POWER FIRST !
The procedures described in this section are performed with power supplied to the
oscilloscope and with the protective covers removed. Only trained service
personnel who are aware of the hazards involved should perform the procedures.
Whenever possible, perform the procedures with the power cord removed from the
oscilloscope. Read the safety notice at the back of this book before proceeding.
HAZARDOUS VOLTAGES EXIST — HIGH VOLTAGE IS PRESENT ON POWER
SUPPLY HEAT SINKS !
The power supply heat sinks of the 2000/3000 X-Series oscilloscopes are at a high
potential. This presents an electric shock hazard. Protect yourself from electric
shock by keeping this area covered or by not coming in contact with the heat sinks
when the power cord is attached to the oscilloscope!
REMOVE POWER TO AVOID DAMAGE !
Do not disconnect any cables or remove any assemblies while power is applied to
the oscilloscope, or damage to the oscilloscope can occur.
84 2000/3000 X-Series Oscilloscopes Service Guide
AVOID ESD DAMAGE TO COMPONENTS !
ELECTROSTATIC DISCHARGE (ESD) can damage electronic components. Use
proper ESD precautions when doing any of the procedures in this chapter. As a
minimum, place the oscilloscope on a properly grounded ESD mat and wear a
properly grounded ESD strap.
1 Disconnect any external cables from the front panel.
2 Disconnect the power cord.
3 Remove the bucket assembly following the instructions on
page 105.
4 Remove the power supply shield following the instructions
on page 107.
5 Separate the front and rear decks following the
instructions on page 110.
Troubleshooting 4
CAUTION
6 Re- connect the interboard supply cable as shown in the
following figure.
Figure 14 Setup for troubleshooting internal assemblies
MAKE SURE EARTH GROUND IS MAINTAINED FOR THE FRONT DECK !
For example, connect a cable with alligator clips between the rear deck chassis
and the front deck chassis, or connect a BNC cable from one of the BNCs on the
system board to a known grounded BNC on your workbench.
Other advice:
• Place the front deck in a cover or rest it on a cloth to
prevent scuffing the front panel knobs.
• Because of the short length of the interboard supply
cable, elevate the rear deck to prevent strain on the
cable.
7 Make sure the keyboard cable, display cable, display
backlight power cable, and all other cables are properly
connected.
2000/3000 X-Series Oscilloscopes Service Guide 85
4 Troubleshooting
CAUTION
USE AN EXTERNAL FAN TO AVOID OVERHEATING COMPONENTS !
When you remove the oscilloscope cover and main shield, use an external fan to
provide continuous air flow over the heat sinks. Air flow over the heat sinks is
reduced when the cover and main shield are removed, which leads to higher than
normal operating temperatures. Have the fan blow air across the system board
where the heat sinks are located. Otherwise, damage to the components can
occur.
If the cover of a 2000/3000 X-Series oscilloscope is removed but the main shield
remains installed and the bottom holes are not blocked, the instrument will cool
properly.
86 2000/3000 X-Series Oscilloscopes Service Guide
Troubleshooting 4
Flowchart for Troubleshooting Internal Assemblies
The following flowchart is a simplified overview of
troubleshooting the oscilloscope’s internal assemblies.
Start
System
Board Voltages
Okay?
Yes
Fan Okay? No
No
Interboard
Supply Voltages
Okay?
Yes
Display/
Keybd Supplies
Okay?
Yes
Replace
System Board
Replace Fan or
Line Filter Board
No
Replace Keyboard
No
Power
Supply Voltages
Okay?
Yes
Replace Line
Filter Board
or Display
No
Replace Power
Supply or Line
Filter Board
Yes
End
2000/3000 X-Series Oscilloscopes Service Guide 87
4 Troubleshooting
System Board Drawings
Use these drawings to locate test points on the 350 MHz,
500 MHz, and 1 GHz bandwidth oscilloscopes’ system board.
Figure 15 System Board Test Points/Connectors - Top Side, Left
88 2000/3000 X-Series Oscilloscopes Service Guide
Troubleshooting 4
Figure 16 System Board Test Points/Connectors - Top Side, Right
2000/3000 X-Series Oscilloscopes Service Guide 89
4 Troubleshooting
To check the system board power supply test points
This procedure checks the power supply test points on the
system board (see See Figure 16 on page 89). Values outside
the expected range help identify bad assemblies.
1 Follow the instructions in “To prepare for internal
assembly troubleshooting” on page 84.
2 Connect the negative lead of the multimeter to a ground
point on the oscilloscope.
3 Connect the power cord, and turn on the oscilloscope.
4 First check the bulk power supply voltage:
Test Poi nt
(near J3701)
VP13V +13 V ±3% All Indicates power supply is good. Go to “To check the interboard
Expected Value Assemblies
Supplied
If Good If Bad
supply connector voltages” on
page 91 and check VP13V there.
5 Next, check the supplies coming from the line filter board:
Test Poi nt
(near J3701)
VP5V +5 V ±3% Keyboard,
VP12V +12 V ±3% System Board
VP1V8 +1.8 V ±3% System Board
VP1V4 +1.4 V ±3% System Board
VP1V +1 V ±3% System Board
VP1V2 +1.2 V ±3% System Board
VP2V5 +2.5 V ±3% System Board
VP3V3 +3.3 V ±3% LCD, System
Expected Value Assemblies
Supplied
System Board
Board
If Good If Bad
Indicates supply coming from line
filter board is good.
Go to “To check the interboard
supply connector voltages” on
page 91.
90 2000/3000 X-Series Oscilloscopes Service Guide
Troubleshooting 4
6 Finally, check the supplies coming from the system board:
Test Poi nt
(near J3701)
VM12V -11.5 V to
VM8V -7.814 V to
VM5V2 -5.023 V to
VP13VF +13 V ±3% System Board Replace the system board.
VP23V +22.84 V to
VP13V_PRB +13 V ±3% AutoProbe
Expected Value Assemblies
Supplied
System Board Indicates supply coming from
-12.5 V
System Board Replace the system board.
-8.333 V
System Board Replace the system board.
-5.329 V
Display
+24.2 V
Backlight
Power
Interface
If Good If Bad
Replace the system board.
system board is good.
Go to “To check the display
supplies” on page 97.
Go to “To check the keyboard
supplies” on page 98.
To check the interboard supply connector voltages
This procedure checks the voltages on the line filter board’s
interboard supply connector (J108) when the interboard
supply cable is disconnected.
If these voltages are bad when the cable is connected but
good when the cable is disconnected, it indicates problems
with the system board, keyboard, or display assemblies that
are being supplied.
1 Follow the instructions in “To prepare for internal
assembly troubleshooting” on page 84.
2 Connect the negative lead of the multimeter to a ground
point on the oscilloscope.
3 With the power cord disconnected, disconnect the
interboard supply cable from the system board and the
line filter board.
4 Connect the power cord, and turn on the oscilloscope.
2000/3000 X-Series Oscilloscopes Service Guide 91
4 Troubleshooting
5 Check the voltages on the line filter board’s interboard
supply connector J108.
Cable-Interboard Header
39-29- 9202
VP1V
VP1V4
VP1V8
VP13V
VP12V
LINE_TRI G
VP5V
1252-8073
10
9
8
7
6
5
4
2
1
J108
20
19
18
17
16
15
14
133
12
11
GND
VP1V
VP1V2
VP2V5
VP3V3
Figure 17 Line filter board interboard supply connector J108
a If the VP13V bulk supply was bad at the system board
test point, check it again at the interboard supply
connector J108:
Test Poi nt
(near J3701)
VP13V +13 V ±3% Whole
Expected Value Assemblies
Supplied
system
If Good If Bad
If good when the interboard supply
cable is disconnected from the
system board, but bad when the
interboard supply cable is
Go to “To check the line filter
board AC output” on page 93 to
test whether the AC input to the
power supply is good.
connected, this indicates a
problem with either the cable or
the assemblies supplied,
1 First, test the interboard supply
cable for opens or shorts using
the DMM.
2 If the interboard supply cable is
good, replace the system board.
92 2000/3000 X-Series Oscilloscopes Service Guide
Troubleshooting 4
b If the VP13V bulk supply was good at the system board
test point, but other supplies coming from the line
filter board were bad at the system board test points,
check them again at the interboard supply connector
J108:
Test Poi nt
(near J3701)
VP5V +5 V ±3% Keyboard,
VP12V +12 V ±3% System Board If good when the interboard supply
VP1V8 +1.8 V ±3% System Board Replace the line filter board.
VP1V4 +1.4 V ±3% System Board Replace the line filter board.
VP1V +1 V ±3% System Board Replace the line filter board.
VP1V2 +1.2 V ±3% System Board Replace the line filter board.
VP2V5 +2.5 V ±3% System Board Replace the line filter board.
VP3V3 +3.3 V ±3% LCD, System
Expected Value Assemblies
Supplied
System Board
Board
If Good If Bad
Go to “To check the keyboard
supplies” on page 98.
cable is disconnected from the
system board, but bad when the
interboard supply cable is
connected, this indicates a
problem with either the cable or
the assemblies supplied,
1 First, test the interboard supply
cable for opens or shorts using
the DMM.
2 If the interboard supply cable is
good, replace the system board.
Go to “To check the display
supplies” on page 97.
Replace the line filter board.
Replace the line filter board.
Replace the line filter board.
To check the line filter board AC output
When the 13 V bulk power is not being properly supplied,
this procedure tests the AC input to the power supply to
determine whether there is a problem with the line filter
board.
1 Follow the instructions in “To prepare for internal
assembly troubleshooting” on page 84.
2 Connect the power cord, and turn on the oscilloscope.
3 Verify that AC power is present at J1 on the power supply
using a DVM and probes as shown in the following picture
(remember this is an AC voltage measurement!).
2000/3000 X-Series Oscilloscopes Service Guide 93
4 Troubleshooting
Figure 18 Verify line filter board AC output
• If you have AC power equal to what is being applied to
J100 (power cord socket) on the line filter assembly,
the AC mains portion of the line filter assembly is
probably okay.
• If there is no AC power at J1 of the power supply,
there is something wrong with the AC mains section of
the line filter assembly, and you need to replace the
line filter assembly.
• If there is AC power at J1 of the power supply, but the
instrument still will not power ON when the power
switch (S100) is in the ON position, go to “To check the
power switch” on page 95.
94 2000/3000 X-Series Oscilloscopes Service Guide
To check the power switch
This procedure verifies the operation of the power switch
(S100) on the line filter board assembly.
1 Follow the instructions in “To prepare for internal
assembly troubleshooting” on page 84.
2 With the power cord disconnected, verify the operation of
the power switch (S100) using a DMM in the resistance
measurement mode and a set of probes.
a Connect the “- ” side of the DMM to pin 6 of J107 on
the line filter board and the “+” side of the DMM to pin
6 of J6 on the power supply.
Troubleshooting 4
Figure 19 Verify power switch operation
• With S100 in the OFF position (switch contacts closed)
you should measure less than 1 ohm of resistance.
• With S100 in the ON position (switch contacts open)
you should measure at least 8k ohms.
2000/3000 X-Series Oscilloscopes Service Guide 95
4 Troubleshooting
If you do not measure these two values:
• There may be something wrong with the power switch
(S100 on the line filter assembly).
• The cable that connects between J107 on the line filter
assembly and J6 and J4 on the power supply could be
wired wrong.
• The power supply could be defective.
To figure out which of these is causing the problem, see
“To check the power supply DC output” on page 96.
To check the power supply DC output
This procedure checks the power supply DC output after
verifying the AC input is good and checking the power
switch operation.
1 Follow the instructions in “To prepare for internal
assembly troubleshooting” on page 84.
2 Connect the negative lead of the multimeter to a ground
point on the oscilloscope.
3 With the power cord disconnected:
a Disconnect the DC supply cable that is plugged into
J107 of the line filter assembly.
4 Connect the power cord, and turn on the oscilloscope.
5 Verify there is +13V between pins 1 (+) and 4 (- ) of J4 on
the power supply.
If +13V is not present between pins 1 and 4 of J4 on the
power supply, replace the power supply.
96 2000/3000 X-Series Oscilloscopes Service Guide
If +13V is present between pins 1 and 4 of J4 on the
power supply, either the cable is wired incorrectly or the
power switch S100 is defective or has a solder short to
ground between one or some of its pins.
a Turn off the oscilloscope, and disconnect the power
cord.
b Replace the DC supply cable.
c Connect the power cord, and turn on the oscilloscope.
d Check again to see if the output of the power supply
turns ON and OFF as you actuate the power switch
S100.
If replacing the cable does not fix the problem, there is
something wrong with the power switch S100, and you
must replace the line filter assembly.
To check the display supplies
This procedure checks the display supply voltages on the
system board test points when the display backlight power
cable and the display cable are disconnected.
Troubleshooting 4
If one or both of these voltages are bad when the cables are
connected but good when the cables are disconnected, it
indicates problems with the display assembly.
1 Follow the instructions in “To prepare for internal
assembly troubleshooting” on page 84.
2 Connect the negative lead of the multimeter to a ground
point on the oscilloscope.
3 With the power cord disconnected:
a Disconnect the display backlight power cable from the
system board connector J3702.
b Disconnect the display cable from the system board
connector J2001.
4 Connect the power cord, and turn on the oscilloscope.
2000/3000 X-Series Oscilloscopes Service Guide 97
4 Troubleshooting
5 Check the display supplies:
Test Poi nt
(near J3701)
VP23V +22.84 V to
VP3V3 +3.3 V ±3% LCD, System
Expected Value Assemblies
Supplied
Display
+24.2 V
Backlight
Power
Board
To check the keyboard supplies
If Good If Bad
Replace the display assembly. Replace the system board.
If good when the display cable is
disconnected from the system
board, but bad when the display
cable is connected, this indicates a
problem with either the display
cable or the display assembly,
1 Turn off the oscilloscope, and
disconnect the power cord.
2 Replace the display cable.
3 Connect the power cord, and
turn on the oscilloscope.
If the problem is not fixed, replace
the display assembly.
Replace the line filter board.
This procedure checks the keyboard supply voltages on the
system board test points when the keyboard cable is
disconnected.
If one or both of these voltages are bad when the keyboard
cable is connected but good when the cable is disconnected,
it indicates problems with the keyboard assembly.
1 Follow the instructions in “To prepare for internal
assembly troubleshooting” on page 84.
2 Connect the negative lead of the multimeter to a ground
point on the oscilloscope.
98 2000/3000 X-Series Oscilloscopes Service Guide
Troubleshooting 4
3 With the power cord disconnected:
a Disconnect the keyboard cable from the system board
connector J3403.
4 Connect the power cord, and turn on the oscilloscope.
5 Check the keyboard supplies:
Test Poi nt
(near J3701)
VP5V +5 V ±3% Keyboard,
VP13V_PRB +13 V ±3% AutoProbe
Expected Value Assemblies
Supplied
System Board
Interface
To check the fan
The fan speed is controlled by a circuit on the line filter
board.
If the fan is running, perform the hardware self- tests. Go to
“To perform hardware self test” on page 78.
If Good If Bad
If good when the keyboard cable is
disconnected from the system
board, but bad when the keyboard
cable is connected, this indicates a
problem with either the keyboard
cable or the keyboard,
1 Turn off the oscilloscope, and
disconnect the power cord.
2 Replace the keyboard cable.
3 Connect the power cord, and
turn on the oscilloscope.
a If the problem is not fixed,
replace the keyboard.
Replace the line filter board.
Replace the system board.
If the fan is not running, it may be defective. Follow these
steps:
1 Follow the instructions in “To prepare for internal
assembly troubleshooting” on page 84.
2 Disconnect the fan cable from the line filter board.
3 Connect the power cord, and turn on the oscilloscope.
2000/3000 X-Series Oscilloscopes Service Guide 99
4 Troubleshooting
4 Measure the fan voltage at the connector on the line filter
board.
See the following figure for the location of the fan
connector.
5 If the fan voltage is approximately +6.5 Vdc at room
temperature, replace the fan. If the fan voltage is not
approximately +6.5 Vdc, replace the line filter board.
The proper voltage range depending on temperature is
between +6.5 Vdc to +8.5 Vdc.
Figure 20 Location of the Fan Connector
100 2000/3000 X-Series Oscilloscopes Service Guide
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