Keysight DSOX1204A, DSOX1204G Service Manual

Keysight InfiniiVision
DSOX1204A/G
Oscilloscopes

Service Guide

Notices

CAUTION

WARNING

© Keysight Technologies, Inc. 2008-2019

No part of this manual may be reproduced in
any form or by any means (including elec­tronic storage and retrieval or translation into
a foreign language) without prior agreement
and written consent from Keysight Technolo­gies, Inc. as governed by United States and
international copyright laws.

Manual Part Number

N2137-97013

Edition

February 2019

Available in electronic format only

Published by:
Keysight Technologies, Inc.
1900 Garden of the Gods Road
Colorado Springs, CO 80907 USA

A newer version of this manual may
be available at

www.keysight.com/manuals/
DSOX1204G

Warranty

The material contained in this document is
provided “as is,” and is subject to being
changed, without notice, in future editions.
Further, to the maximum extent permitted
by applicable law, Keysight disclaims all
warranties, either express or implied, with
regard to this manual and any information
contained herein, including but not limited
to the implied warranties of merchantability
and fitness for a particular purpose. Key­sight shall not be liable for errors or for inci­dental or consequential damages in
connection with the furnishing, use, or per­formance of this document or of any infor­mation contained herein. Should Keysight
and the user have a separate written agree­ment with warranty terms covering the

material in this document that conflict with
these terms, the warranty terms in the sepa­rate agreement shall control.

Technology Licenses

The hardware and/or software described in
this document are furnished under a license
and may be used or copied only in accor­dance with the terms of such license.

U.S. Government Rights

The Software is "commercial computer
software," as defined by Federal Acquisition
Regulation ("FAR") 2.101. Pursuant to FAR

12.212 and 27.405-3 and Department of
Defense FAR Supplement ("DFARS")

227.7202, the U.S. government acquires
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same terms by which the software is
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Accordingly, Keysight provides the Software
to U.S. government customers under its
standard commercial license, which is
embodied in its End User License Agreement
(EULA), a copy of which can be found at

www.keysight.com/find/sweula. The

license set forth in the EULA represents the
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license set forth therein, does not require or
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Furnish technical information related to
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documentation that is not customarily
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commercial computer software or
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documentation. No additional government
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those terms, rights, or licenses are explicitly
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be under no obligation to update, revise or
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to any technical data as defined by FAR

2.101, pursuant to FAR 12.211 and 27.404.2
and DFARS 227.7102, the U.S. government
acquires no greater than Limited Rights as
defined in FAR 27.401 or DFAR 227.7103-5
(c), as applicable in any technical data.

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 the like
that, if not correctly performed or
adhered to, could result in personal
injury or death. Do not proceed
beyond a WARNING notice until the
indicated conditions are fully
understood and met.

2 DSOX1204A/G Oscilloscopes Service Guide

In This Service Guide

This book provides the service information for the Keysight InfiniiVision
DSOX1204A/G oscilloscopes. This manual is divided into these chapters:

1 Characteristics and Specifications

This chapter contains a partial list of characteristics and specifications for the
Keysight InfiniiVision DSOX1204A/G oscilloscopes.

2 Testing 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.

4 Troubleshooting

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.

5 Replacing Assemblies

The service policy for DSOX1204A/G oscilloscopes is unit replacement, so there
are no instructions for replacing internal assemblies in this service guide.

6Replaceable Parts

Because the service policy for the DSOX1204A/G oscilloscopes is unit
replacement, no replaceable parts are available.

7Safety Notices

At the front of the book you will find safety notice descriptions and document
warranties.

DSOX1204A/G Oscilloscopes Service Guide 3

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 DSOX1204A/G Oscilloscopes Service Guide

Contents

In This Service Guide / 3

Figures / 7

Tables / 9

1 Characteristics and Specifications

Power Requirements / 11

Measurement Category / 12

Measurement Category / 12
Measurement Category Definitions / 12

Maximum Input Voltages / 13

Environmental Conditions / 13

Specifications / 14

Contact Us / 14

2 Testing Performance

Overview / 16

List of Test Equipment / 17

Conventions / 18

To verify DC vertical gain accuracy / 19

To verify bandwidth (-3 dB) / 24

To verify time base accuracy / 28

To verify trigger sensitivity / 30

Test Internal Trigger Sensitivity / 31

DSOX1204A/G Oscilloscopes Service Guide 5

Contents

Keysight DSOX1204A/G Oscilloscopes Performance Test

Record / 34

3 Calibrating and Adjusting

User Calibration / 38

To perform User C al / 38
User Cal Status / 38

4 Troubleshooting

Solving General Problems with the Oscilloscope / 40

If there is no display / 40
If there is no trace display / 40
If the trace display is unusual or unexpected / 40
If you cannot see a channel / 41

Verifying Basic Operation / 42

To power-on the oscilloscope / 42
To perform hardware self test / 42
To perform front panel self test / 43
To verify default setup / 43
To perform an Auto Scale on the Probe Comp signal / 45
To compensate passive probes / 46

5 Replacing Assemblies

6 Replaceable Parts

7 Safety Notices

Warnings / 52

To clean the instr ument / 53

Safety Symbols / 54

Index

6 DSOX1204A/G Oscilloscopes Service Guide

Figures

Figure 1. Setting up Equipment for DC Vertical Gain Accuracy Test / 22
Figure 2. Using a Blocking Capacitor to Reduce Noise / 23
Figure 3. Setting Up Equipment for Bandwidth (-3 dB) Verification Test / 25
Figure 4. Setting Up Equipment for Internal Trigger Sensitivity Test / 32
Figure 5. Default setup screen / 44
Figure 6. Example pulses / 46

DSOX1204A/G Oscilloscopes Service Guide 7

Figures

8 DSOX1204A/G Oscilloscopes Service Guide

Tables

Table 1. List of test equipment / 17
Table 2. Conventions / 18
Table 3. DC Vertical Gain Accuracy Test Limits / 19
Table 4. Equipment Required to Verify DC Vertical Gain Accuracy / 19
Table 5. Settings Used to Verify DC Vertical Gain Accuracy / 20
Table 6. Bandwidth (-3 dB) Test Limits / 24
Table 7. Equipment Required to Verify Bandwidth (-3 dB) / 24
Table 8. Time Base Accuracy Test Limits / 28
Table 9. Equipment Required to Verify Time Base Accuracy / 28
Table 10. Equipment Required to Verify Trigger Sensitivity / 30
Table 11. Internal Trigger Sensitivity Specifications / 31

DSOX1204A/G Oscilloscopes Service Guide 9

Tables

10 DSOX1204A/G Oscilloscopes Service Guide

Keysight InfiniiVision DSOX1204A/G Oscilloscope

Service Guide

1 Characteristics and

Specifications

Power Requirements / 11
Measurement Category / 12
Maximum Input Voltages / 13
Environmental Conditions / 13
Specifications / 14
Contact Us / 14

This chapter contains a partial list of characteristics and specifications for the
Keysight InfiniiVision DSOX1204A/G oscilloscopes.

For a full list of Keysight InfiniiVision DSOX1204A/G oscilloscopes characteristics
and specifications see the data sheets.

The data sheets are available at www.keysight.com/products/DSOX1204G.

Power Requirements

Line voltage, frequency, and power:

• ~Line 100-120 Vac, 50/60/400 Hz

• 100-240 Vac, 50/60 Hz

•50W max

11

1 Characteristics and Specifications

WARNING

Measurement Category

Measurement Category

The InfiniiVision DSOX1204A/G oscilloscope are not intended to be used for
measurements in Measurement Category II, III, or IV.

Use this instrument only for measurements within its specified measurement category
(not rated for CAT II, III, IV). No transient overvoltages allowed.

Measurement Category Definitions

The "Not rated for CAT II, III, IV" measurement category 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.

12 DSOX1204A/G Oscilloscopes Service Guide

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.

Maximum Input Voltages

CAUTION

CAUTION

Maximum input voltage for analog inputs:

150 Vrms, 200 Vpk

Maximum input voltage for external trigger input:

30 Vrms

Environmental Conditions

Environment Indoor use only.

Characteristics and Specifications 1

Ambient
temperature

Humidity Operating: Up to 95% RH, non-condensing to temperatures up to +40 °C

Altitude Operating: Up to 3,000 m

Overvoltage
Category

Pollution Degree The InfiniiVision DSOX1204A/G oscilloscopes may be operated in environments

Pollution Degree
Definitions

Operating: 0
Non-operating: –40 °C to +70 °C

decreasing linearly to 50% RH at +50 °C

Non-operating: Up to 90% RH up to +65 °C (non condensing)

Non-operating: Up to 15,300 m

This product is intended to be powered by MAINS that comply to Overvoltage
Category II, which is typical of cord-and-plug connected equipment.

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 to +50 °C

DSOX1204A/G Oscilloscopes Service Guide 13

1 Characteristics and Specifications

Specifications

Please see the InfiniiVision DSOX1204A/G Oscilloscopes Data Sheet for complete,
up-to-date specifications and characteristics.

To download a copy of the data sheet please visit:

www.keysight.com/products/DSOX1204G.

Or go to the Keysight home page at www.keysight.com and search for
DSOX1204A/G oscilloscopes data sheet.

To order a data sheet by phone, please contact your local Keysight office.

Contact Us

To contact Keysight, see: www.keysight.com/find/contactus

14 DSOX1204A/G Oscilloscopes Service Guide

Keysight InfiniiVision DSOX1204A/G Oscilloscope

Service Guide

2 Testing Performance

Overview / 16
List of Test Equipment / 17
To verify DC vertical gain accuracy / 19
To verify bandwidth (- 3 dB) / 24
To verify time base accuracy / 28
To verify trigger sensitivity / 30
Keysight DSOX1204A/G Oscilloscopes Performance Test Record / 34

This chapter explains how to verify correct oscilloscope operation and perform
tests to ensure that the oscilloscope meets the performance specifications.

15

2 Testing Performance

Overview

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 34.
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.

16 DSOX1204A/G 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.

Table 1 List of test equipment

Equipment Critical Specifications Recommended Model/

Part Number

Digital Multimeter 0.1 mV resolution, 0.005% accuracy Keysight 34401A

Power Splitter Outputs differ by 0.15 dB Keysight 11667B

Oscilloscope Calibrator DC offset voltage of -5.5 V to 70.5 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 ±3% accuracy Keysight E9304A or

BNC banana cable BNC (m) to dual banana Pomona 2BC-BNC-36 or

BNC cable (qty 3) BNC - BNC, 48” length Keysight 10503A

Cable Type N (m) 609.6 mm (24 in.) Keysight 11500B

Adapter BNC(f) to banana(m) Keysight 1251-2277

Adapter BNC Tee (m) (f) (f) Keysight 1250-0781† or

Adapter Type N (m) to BNC (m) Keysight 1250-0082 or

Blocking capacitor and shorting cap Note: if a BNC blocking capacitor is not available use an

Adapter (qty 3) N(m) to BNC(f) Keysight 1250-0780

50 Ohm Feedthrough Termination 50

Most parts and equipment are available at www.keysight.com. See respective manufacturer’s websites for their equipment.

†

These parts available at www.parts.keysight.com at the time this manual was published.

±3% accuracy Keysight N1914A

SMA blocking capacitor.

Ω BNC (f) to BNC (m) Keysight 0960-0301

Fluke 5820A

Keysight N5181A

N8482A

Keysight 11001-66001

†

†

Pomona 3285

Pomona 3288 with
Pomona 3533

Keysight 11742A +
Pomona 4288 +
Pomona 5088

DSOX1204A/G Oscilloscopes Service Guide 17

2 Testing Performance

Conventions

The following conventions will be used when referring to oscilloscope models
throughout this chapter.

Table 2 Conventions

Models Referred to as:

DSOX1204A, DSOX1204G 70 MHz Models

DSOX1204A, DSOX1204G with D1200BW1A upgrade 100 MHz Models

DSOX1204A, DSOX1204G with D1200BW2A upgrade (from
70 MHz) or D1200BW3A upgrade (from 100 MHz)

200 MHz Models

18 DSOX1204A/G 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.

Table 3 DC Vertical Gain Accuracy Test Limits

Test Limits Notes

Testing Performance 2

±3% of full scale (>= 10 mV/div);
±4% of full scale (< 10 mV/div)

• Full scale is defined as 8 mV on the 500 uV/div range.

• Full scale on all other ranges is defined as 8 divisions

times the V/div setting.

Table 4 Equipment Required to Verify DC Vertical Gain Accuracy

Equipment Critical Specifications Recommended Model/Part

Oscilloscope Calibrator 3.5 mV to 70 Vdc,

0.1 V resolution

Digital multimeter Better than 0.01% accuracy Keysight 34401A

Cable BNC, Qty 2 Keysight 10503A

Shorting cap BNC Keysight 1250-0774

Adapter BNC (f) to banana (m) Keysight 1251-2277

Adapter BNC tee (m) (f) (f ) Keysight 1250-0781 or Pomona

Blocking capacitor Keysight 11742A +

Fluke 5820A

3285

Pomona 4288 +
Pomona 5088

1 Press [Save/Recall] > Default/Erase > Factory Default to recall the factory default

setup.

2 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).

DSOX1204A/G Oscilloscopes Service Guide 19

2 Testing Performance

3 Set up the oscilloscope.

Table 5 Settings Used to Verify DC Vertical Gain Accuracy

a Adjust the horizontal scale to 200.0 us/div.
b Set the Volts/Div setting to the value in the first line and column of Table 5 .
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.

Volts/Div Setting Oscilloscope Calibrator

Setting

10 V/Div 70 V 67.6 V to 72.4 V

5 V/Div 35 V 33.8 V to 36.2 V

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

0.5 mV/Div

1

Reduce Noise" on page 23.

1

1

1

1, 2

A blocking capacitor is required at this range to reduce noise. See “Use a Blocking Capacitor to

35 mV 33.4 mV to 36.6 mV

14 mV 13.36 mV to 14.64 mV

7 mV 6.68 mV to 7.32 mV

3.5mV 3.18mV to 3.82mV

Test Limits

2

Full scale is defined as 8 mV on the 500 uV/div range. Full scale on all other ranges is defined as 8

divisions times the V/div setting.

20 DSOX1204A/G Oscilloscopes Service Guide

Testing Performance 2

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.

c Press Type:; 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 1).

DSOX1204A/G Oscilloscopes Service Guide 21

2 Testing Performance

Oscilloscope

Oscilloscope
Calibrator

Digital
Multimeter

BNC Tee

BNC (f) to dual
bananna adapter

Figure 1 Setting up Equipment for DC Vertical Gain Accuracy Test

7 Adjust the output so that the multimeter reading displays, as close as possible,

the first Volts/div calibrator setting value in Tab le 5.

8 Wait until the measurement settles.
9 Read the “current” average voltage value again as V2.
10 Calculate the difference V2 - V1.

22 DSOX1204A/G Oscilloscopes Service Guide

Testing Performance 2

To oscilloscope input

BNC shorting
cap

Blocking
Capacitor

The difference in average voltage readings should be within the test limits of

Table 5.

If a result is not within the test limits, go to the “Troubleshooting” chapter. Then
return here.

11 Disconnect the oscilloscope calibrator from the oscilloscope.
12 Repeat this procedure to check the DC vertical gain accuracy with the

remaining Volts/div setting values in Table 5.

13 Finally, repeat this procedure for the remaining channels to be tested.

Use a Blocking Capacitor to Reduce Noise

On the more sensitive ranges, such as 0.5 mV/div, 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 2. 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 17 for details.

Figure 2 Using a Blocking Capacitor to Reduce Noise

DSOX1204A/G Oscilloscopes Service Guide 23

2 Testing Performance

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.

Table 6 Bandwidth (-3 dB) Test Limits

Models Test Limits

200 MHz Models All channels (-3 dB), dc to 200 MHz

100 MHz Models All channels (-3 dB), dc to 100 MHz

70 MHz Models All channels (-3 dB), dc to 70 MHz

Table 7 Equipment Required to Verify Bandwidth (-3 dB)

Equipment Critical Specifications Recommended Model/Part

Signal Generator 100 kHz - 200 MHz at 200 mVrms Keysight N5181A

Power Meter 1 MHz - 200 MHz ±3% accuracy Keysight N1914A

Power Sensor 1 MHz - 200 MHz ±3% accuracy Keysight E9304A or N8482A

Power Splitter outputs differ by < 0.15 dB Keysight 11667A

Cable Type N (m) 24 inch Keysight 11500B

Adapter Type N (m) to BNC (m) Keysight 1250-0082 or

Pomona 3288 with Pomona
3533

50 Ohm Feedthrough
Termination

1 Connect the equipment (see Figure 3).

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 using a 50 ohm feedthrough terminator at the oscilloscope

input BNC.

24 DSOX1204A/G Oscilloscopes Service Guide

Ω BNC (f) to BNC (m) Keysight 0960-0301

50

50 Ohm Feedthrough

N to BNC Adapter

Testing Performance 2

Oscilloscope

Signal
Generator

Power Splitter

Power Sensor

N Cable

Power
Meter

Figure 3 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.

DSOX1204A/G Oscilloscopes Service Guide 25

2 Testing Performance

Vin

1MHz

Pmeas

1MHz

50Ω×=

3 Set up the oscilloscope.

a Press the [Default Setup] key.
b Set channel 1 Coupling to DC.
c Set the time base to 500 ns/div.
d Set the Volts/Div for channel 1 to 200 mV/div.
e Press the [Acquire] key, then press the Averaging softkey.
f 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 Type: softkey and use the Entry knob to select AC RMS - N Cycles

within the select menu.

d Press the Add Measurement softkey.

6 Note the oscilloscope AC RMS - Cyc(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

1/2

50Ω)

9 Change the signal generator output frequency according to the maximum

frequency for the oscilloscope using the following:

• 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.

26 DSOX1204A/G Oscilloscopes Service Guide

= 211.2 mV

rms

.

= (892*10-6 *

1MHz

Example If:

Vin

maxfreq

Pmeas

maxfreq

50Ω×=

response(dB) = 20 log

10











MHz 1 MHz 1

freqmax freqma x

Vin / Vout

Vin / Vout

response(dB) = 20 log

10













mV 185.3 / mV 161.6

= -1.16 dB

Testing Performance 2

11 Set the oscilloscope sweep speed according to the following:

• 200 MHz Models: 2 ns/div

• 100 MHz Models: 5 ns/div

• 70 MHz Models: 5 ns/div

12 Note the oscilloscope AC RMS - Cyc(1) reading at the bottom of the screen.
13 Note the reading on the power meter and covert to Vrms using the expression:

14 Calculate the response using the expression:

Pmeas
Std Dev(n)
Pmeas
Std Dev(n)

Then after converting the values from the power meter to Vrms:

1_MHz

1MHz

max_freq

max freq

= 892 uW

= 210.4 mV

= 687 uW

= 161.6 mV

DSOX1204A/G Oscilloscopes Service Guide 27

mV211.2mV/ 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 34).

16 Move the power splitter from the channel 1 to the channel 2 input.
17 Turn off the current channel and turn on channel 2 using the channel keys.
18 Set the trigger source to channel 2.
19 Repeat steps 3 through 15 for the remaining channels, setting the parameters

of the channel being tested where appropriate.

2 Testing Performance

To verify time base accuracy

This test verifies the accuracy of the time base.

Table 8 Time Base Accuracy Test Limits

Models Test Limits

All Models 50 ppm ±5 ppm per year (aging)

In this test you will measure the absolute error of the time base oscillator and
compare the results to the specification.

Table 9 Equipment Required to Verify Time Base Accuracy

Equipment Critical Specifications Recommended Model/Part

Signal Generator 100 kHz - 200 MHz, 0.01 Hz frequency

resolution,
jitter: < 2ps

Cable BNC, 3 feet Keysight 10503A

50 Ohm Feedthrough
Termination

1 Set up the signal generator.

a Set the output to 10 MHz, approximately 1 V

2 Connect the output of the signal generator to oscilloscope channel 1 using the

BNC cable. Also, connect a 50 ohm feedthrough termination between the
channel 1 input and the BNC cable.

Ω BNC (f) to BNC (m) Keysight 0960-0301

50

Keysight N5181A

sine wave.

pp

28 DSOX1204A/G Oscilloscopes Service Guide

Testing Performance 2

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 10 ns/div.
d Adjust the intensity to get a sharp, clear trace.
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 1 ms/div.
b Set horizontal position control to +1 ms (rotate control CCW).
c Set the oscilloscope horizontal sweep speed control to 10 ns/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 Derive the date code from the oscilloscope’s serial number to calculate the

number of years since manufacture. Include any fractional portion of a year.

i First, get the 3rd to 6th digits of the serial number. For example, for the

serial number CN47470001, get “4747”.

ii If the number is greater than 4000, subtract 4000 to get the Date Code.

For example, 4747-4000 is “0747”.

iii If the number is smaller than 4000, add 6000 to get the Date Code.

iv In the Date Code, the first two digits represent the year, and the second

two digits represent the week in the year. For example, for “0747”, the
year is “07” and the week is “47”.

f Use the following formula to calculate the test limits.

Time base accuracy limit: 50 ppm ±5 ppm per year (aging)

g Record the result and compare it to the limits in the Performance Test

Record (see page 34).

DSOX1204A/G Oscilloscopes Service Guide 29

2 Testing Performance

To verify trigger sensitivity

These tests verify the trigger sensitivity. In these tests, you will apply a sine wave
to the oscilloscope at two bandwidths: 10 MHz and the maximum bandwidth of
the oscilloscope. For each sine wave, you will decrease the amplitude of the signal
to a specified level and check to see if the oscilloscope still triggers.

Table 10 Equipment Required to Verify Trigger Sensitivity

Equipment Critical Specifications Recommended Model/Part

Signal Generator 10 MHz and 70 MHz, 100 MHz, or

200 MHz sine waves

Power splitter Outputs differ < 0.15 dB Keysight 11667A

Power Meter Keysight N1914A

Power Sensor Keysight E9304A or N8482A

Cable BNC, Qty 3 Keysight 10503A

Adapter N (m) to BNC (f), Qty 3 Keysight 1250-0780

Feedthrough 50

Ω BNC (f) to BNC (m) Keysight 0960-0301

Keysight N5181A

30 DSOX1204A/G Oscilloscopes Service Guide

Test Internal Trigger Sensitivity

Table 11 Internal Trigger Sensitivity Specifications

Testing Performance 2

Oscilloscope
Models

70 MHz greater of 0.6 div or 2.5 mV greater of 0.9 div or 3.8 mV

100 MHz greater of 0.6 div or 2.5 mV greater of 1.2 div or 5 mV

200 MHz greater of 0.6 div or 2.5 mV greater of 1.2 div or 5 mV

Follow these steps to perform the internal trigger sensitivity test:

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 4).

a Connect the signal generator output to the oscilloscope channel 1 input.
b Connect a 50 ohm feedthrough termination between the channel 1 input

and the BNC cable.

Internal Trigger Sensitivity Specification Bandwidth

<= 10 MHz Maximum Bandwidth

DSOX1204A/G Oscilloscopes Service Guide 31

2 Testing Performance

Oscilloscope

Signal
Generator

50 Ohm Feedthrough

N to BNC Adapter

N Cable

Figure 4 Setting Up Equipment for Internal Trigger Sensitivity Test

4 Set the output frequency of the signal generator to 10 MHz.
5 Perform these steps to test at the 10 MHz 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

32 DSOX1204A/G Oscilloscopes Service Guide

) is displayed.

pp

pp

.

Testing Performance 2

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 34).

g Repeat this step for the remaining oscilloscope channels.

6 Set the output frequency of the signal generator to the maximum bandwidth of

the oscilloscope:

• 200 MHz models: 200 MHz

• 100 MHz models: 100 MHz

• 70 MHz models: 70 MHz

7 Perform these steps to test at the maximum bandwidth 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 as described in the

following table according to your oscilloscope’s maximum bandwidth:

pp

.

Oscilloscope’s maximum
bandwidth:

70 MHz 0.9 vertical divisions 9 mVpp

100 MHz 1.2 vertical divisions 12 mVpp

200 MHz 1.2 vertical divisions 12 mVpp

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 34).

g Repeat this step for the remaining oscilloscope channels.

DSOX1204A/G Oscilloscopes Service Guide 33

Decrease amplitude until these
vertical divisions are displayed:

Which is about this V:

2 Testing Performance

Keysight DSOX1204A/G Oscilloscopes Performance Test Record

Serial No. ______________________________________ Test by _____________________________
Test Interval ____________________________________ Work Order No. ______________________
Recommended Next Testing ________________________ Temperature ____________

DC Vertical Gain Accuracy
Range Power Supply Setting Test Limits Channel 1 Channel 2 Channel 3 Channel 4

10 V/Div 70 V 67.6 V to 72.4 V ________ ________ ________ ________
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 13.36 mV to 14.64 mV ________ ________ ________ ________
1 mV/Div 7 mV 6.68 mV to 7.32 mV ________ ________ ________ ________

0.5 mV/Div 3.5 mV 3.18 mV to 3.82 mV ________ ________ ________ ________

Bandwidth (-3 dB) Model Test Limits Channel 1 Channel 2 Channel 3 Channel 4

200 MHz -3 dB at 200 MHz ________ ________ ________ ________
100 MHz -3 dB at 100 MHz ________ ________ ________ ________
70 MHz -3 dB at 70 MHz ________ ________ ________ ________

Time Base Accuracy Limits Calculated

time base
accuracy
limit (ppm)

Time Base Accuracy Limit: 50 ppm ±5 ppm per year
(aging)

_________ ________ ________

Measured
time base
error (ppm)

Pass/Fail

34 DSOX1204A/G Oscilloscopes Service Guide

Testing Performance 2

Internal Trigger Sensitivity

Generator Setting Test Limits, greater of Channel 1 Channel 2 Channel 3 Channel 4

200 MHz models: 10 MHz 0.6 div or 2.5 mV ________ ________ ________ ________

Max BW (200 MHz) 1.2 div or 5 mV ________ ________ ________ ________

100 MHz models: 10 MHz 0.6 div or 2.5 mV ________ ________ ________ ________

Max BW (100 MHz) 1.2 div or 5 mV ________ ________ ________ ________

70 MHz models: 10 MHz 0.6 div or 2.5 mV ________ ________ ________ ________

Max BW (70 MHz) 0.9 div or 3.8 mV ________ ________ ________ ________

DSOX1204A/G Oscilloscopes Service Guide 35

2 Testing Performance

36 DSOX1204A/G Oscilloscopes Service Guide

Keysight InfiniiVision DSOX1204A/G Oscilloscope

Service Guide

3 Calibrating and Adjusting

This chapter explains how to adjust the oscilloscope for optimum operating
performance. You should perform user calibration according to the following
recommendations:

• Every five years or after 10000 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 warm up for at least 30
minutes.

37

3 Calibrating and Adjusting

User Calibration

Perform user-calibration:

• Every five years or after 10000 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 perfo rm Use r Cal

1 Disconnect all inputs from the front panel and allow the oscilloscope to warm

up before performing this procedure.

2 Make sure user calibration protection is not on by pressing the [Utility] > Options

> Auxiliary; then, press the Cal Protect softkey to disable calibration protection.

3 Press the [Utility] key; then, press the Service softkey.
4 Begin the User Cal by pressing the Start User Cal softkey.

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:

38 DSOX1204A/G Oscilloscopes Service Guide

Keysight InfiniiVision DSOX1204A/G Oscilloscope

Service Guide

4 Troubleshooting

Solving General Problems with the Oscilloscope / 40
Verifying Basic Operation / 42

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.

The service policy for all DSOX1204A/G oscilloscopes is unit replacement, so there
are no internal assembly troubleshooting instructions in this service guide.

39

4 Troubleshooting

Solving General Problems with the Oscilloscope

This section describes how to solve general problems that you may encounter
while using the Keysight DSOX1204A/G oscilloscopes.

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.

✔ 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 [Auto Scale] key.

✔ Obtain service from Keysight Technologies, if necessary.

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.

40 DSOX1204A/G Oscilloscopes Service Guide

✔ 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.

✔ 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.

Troubleshooting 4

✔ 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.

✔ Press the [Auto Scale] key to automatically set up all channels.

DSOX1204A/G Oscilloscopes Service Guide 41

4 Troubleshooting

WARNING

Verifying Basic Operation

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. 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.

• 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 Keysight 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 42.

42 DSOX1204A/G Oscilloscopes Service Guide

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.

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.

Troubleshooting 4

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.

• Vertical:

• Channel 1 on.

• 5V/div scale.

• dc coupling.

• 0V position.

• probe attenuation factor to 10.0:1.

• Trigger:

• Edge trigger.

• Auto sweep mode.

DSOX1204A/G Oscilloscopes Service Guide 43

4 Troubleshooting

• 0 V level.

• channel 1 source.

• dc coupling.

• rising edge slope.

• 60 ns holdoff time.

• Display:

• 20% grid intensity.

• persistence off.

• Other:

• Acquire mode normal.

• Run/Stop to Run.

• cursor measurements off.

Figure 5 Default setup screen

2 If your screen looks substantially different, replace the system board.

44 DSOX1204A/G Oscilloscopes Service Guide

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].
5 You should see a waveform on the oscilloscope’s display similar to this:

Troubleshooting 4

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 46.

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.

DSOX1204A/G Oscilloscopes Service Guide 45

4 Troubleshooting

comp.cdr

Perfectly compensated

Over compensated

Under compensated

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.

1 Perform the procedure “To perform an Auto Scale on the Probe Comp

signal" on page 45

2 Press the channel key to which the probe is connected ([1], [2]).
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 some 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.

Figure 6 Example pulses

5 Connect probes to all other oscilloscope channels (channel 2 of a 2-channel

oscilloscope).

46 DSOX1204A/G Oscilloscopes Service Guide

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.

Keysight InfiniiVision DSOX1204A/G Oscilloscope

Service Guide

5 Replacing Assemblies

The service policy for all DSOX1204A/G oscilloscopes is unit replacement, so there
are no instructions for replacing internal assemblies in this service guide.

47

5 Replacing Assemblies

48 DSOX1204A/G Oscilloscopes Service Guide

Keysight InfiniiVision DSOX1204A/G Oscilloscope

Service Guide

6 Replaceable Parts

Because the service policy for DSOX1204A/G oscilloscopes is unit replacement,
no replaceable parts are available for the Keysight DSOX1204A/G oscilloscopes.

49

6 Replaceable Parts

50 DSOX1204A/G Oscilloscopes Service Guide

Keysight InfiniiVision DSOX1204A/G Oscilloscope

Service Guide

7 Safety Notices

This apparatus has been designed and tested in accordance with IEC Publication
61010, Safety Requirements for Measuring Apparatus, and has been supplied in a
safe condition. This is a Safety Class I instrument (provided with terminal for
protective earthing). Before applying power, verify that the correct safety
precautions are taken (see the following warnings). In addition, note the external
markings on the instrument that are described under “Safety Symbols.”

51

7 Safety Notices

Warnings

Before turning on the instrument, you must connect the protective earth terminal
of the instrument to the protective conductor of the (mains) power cord. The
mains plug shall only be inserted in a socket outlet provided with a protective
earth contact. You must not negate the protective action by using an extension
cord (power cable) without a protective conductor (grounding). Grounding one
conductor of a two-conductor outlet is not sufficient protection.

Only fuses with the required rated current, voltage, and specified type (normal
blow, time delay, etc.) should be used. Do not use repaired fuses or short-circuited
fuseholders. To do so could cause a shock or fire hazard.

If you energize this instrument by an auto transformer (for voltage reduction or
mains isolation), the common terminal must be connected to the earth terminal of
the power source.

Whenever it is likely that the ground protection is impaired, you must make the
instrument inoperative and secure it against any unintended operation.

Service instructions are for trained service personnel. To avoid dangerous electric
shock, do not perform any service unless qualified to do so. Do not attempt
internal service or adjustment unless another person, capable of rendering first aid
and resuscitation, is present.

Do not install substitute parts or perform any unauthorized modification to the
instrument.

Capacitors inside the instrument may retain a charge even if the instrument is
disconnected from its source of supply.

Do not operate the instrument in the presence of flammable gasses or fumes.
Operation of any electrical instrument in such an environment constitutes a
definite safety hazard.

Do not use the instrument in a manner not specified by the manufacturer.

52 DSOX1204A/G Oscilloscopes Service Guide

To clean the instrument

If the instrument requires cleaning: (1) Remove power from the instrument. (2)
Clean the external surfaces of the instrument with a soft cloth dampened with a
mixture of mild detergent and water. (3) Make sure that the instrument is
completely dry before reconnecting it to a power source.

Safety Notices 7

DSOX1204A/G Oscilloscopes Service Guide 53

7 Safety Notices

!

Safety Symbols

Instruction manual symbol: the product is marked with this symbol when it is
necessary for you to refer to the instruction manual in order to protect against
damage to the product.

Hazardous voltage symbol.

Earth terminal symbol: Used to indicate a circuit common connected to grounded
chassis.

54 DSOX1204A/G Oscilloscopes Service Guide

Index

A

accuracy, DC vertical gain, 19
assemblies

replacing, 47

B

bandwidth

verification, 24

C

calibration, 38
certificate of calibration, 38
channels

problem solving, 41
cleaning the instrument, 53
compensating your probe, 46
contact Keysight, 14

D

DC vertical gain accuracy, 19
display

problem solving, 40

E

equipment, test, 17

F

front panel self test, 43

H

hardware self test, 42

I

input voltages, maximum, 13

internal self-tests, 42

K

Keysight

contact information, 14

L

LED, startup sequence, 42

M

measurement category, 12

definitions, 12

N

NIST, 38

O

overvoltage category, 13

P

perform user cal, 38
performance

test record, 34
pollution degree, 13
pollution degree, definitions, 13
power requirements, 11
probes

compensating, 46
problem solving, 39

R

record tests, 34
replacing assemblies, 47
run self-tests, 42

S

self test, front panel, 43
self test, hardware, 42
self-alignment, user cal, 38
self-tests, 42
specifications, 14
startup sequence, 42
status, User Cal, 38
status, user cal, 38

T

test

equipment, 17
record, 34

trace display

problem solving, 40

trigger

sensitivity, 30
sensitivity, internal, 31

troubleshooting, 39

U

user calibration, 38

V

verify

bandwidth, 24
trigger, 30

W

warranted specifications, 14

DSOX1204A/G Oscilloscopes Service Guide 55

Index

56 DSOX1204A/G Oscilloscopes Service Guide