RIGOL

Calibration Guide

DG1022 Function/Arbitrary
Waveform Generator

Oct. 2010
RIGOL Technologies, Inc.
 RIGOL

Guaranty and Declaration

Copyright
© 2010 RIGOL Technologies, Inc. All Rights Reserved.

Trademark Information
RIGOL is a registered trademark of RIGOL Technologies, Inc.

Notices
 RIGOL products are protected by patent law in and outside of P.R.C.
 RIGOL reserves the right to modify or change parts of or all the specifications
and pricing policies at company’s sole decision.
 Information in this publication replaces all previously corresponding materials.
 RIGOL shall not be liable for losses caused by either incidental or consequential
in connection with the furnishing, use or performance of this manual as well as
any information contained.
 Any part of this document is forbidden to be copied or photocopied or
rearranged without prior written approval of RIGOL.

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RIGOL guarantees this product conforms to the national and industrial standards in
China. International standard conformance certification is in progress.

Contact Us
If you have any problem or requirement when using our products, please contact
RIGOL or your local distributors, or visit: www.rigol.com

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Contents
1 Calibration Instruction ................................................................... 1-1
1.1 Calibration Time Interval................................................................ 1-1
1.2 Recommended Adjustments ........................................................... 1-1
1.3 Calibration Time............................................................................ 1-1
1.4 Calibration Security ....................................................................... 1-1
1.5 Basic Calibration/Adjustment Procedures ......................................... 1-2
1.6 To Stop the Calibration .................................................................. 1-3
2 Testing Devices and Notice ............................................................ 2-1
2.1 Testing Devices ............................................................................. 2-1
2.2 Testing Notice............................................................................... 2-1
3 Calibration Process......................................................................... 3-1
3.1 Self-test ....................................................................................... 3-2
3.2 Frequency (Int) Adjustment ........................................................... 3-3
3.3 CH1 AC Amplitude Adjustment ....................................................... 3-4
3.4 CH1 Offset DAC ............................................................................ 3-6
3.5 CH1 Low Frequency Flatness Adjustment ........................................ 3-8
3.6 CH1 Output Impedance Adjustment .............................................. 3-10
3.7 CH1 0 dB Range Flatness Adjustment ........................................... 3-12
3.8 CH1 +10 dB Range Flatness Adjustment ....................................... 3-14
3.9 CH1 +20dB Range Flatness Adjustment ........................................ 3-15
3.10 CH2 AC Amplitude Adjustment ..................................................... 3-16
3.11 CH2 Offset DAC .......................................................................... 3-18
3.12 CH2 Low Frequency Flatness Adjustment ...................................... 3-19
3.13 CH2 Output Impedance Adjustment .............................................. 3-21
3.14 CH2 0 dB Range Flatness Adjustment ........................................... 3-23
3.15 CH2 +10 dB Range Flatness Adjustment ....................................... 3-25
3.16 Frequency (Ext) Adjustment ......................................................... 3-26
3.17 Phase Adjustment ....................................................................... 3-27
4 To Save the Calibration Data .......................................................... 4-1
5 To Restore Initial Calibration Value................................................ 5-1
6 Calibration Prompting Messages .................................................... 6-1

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1 Calibration Instruction

1.1 Calibration Time Interval

Regular calibration should be performed on your instrument according to your
measurement accuracy requirement. A one-year calibration time interval can fulfill
most of your applications, a calibration time interval longer than one year can not
ensure the accuracy.

1.2 Recommended Adjustments

No matter how long is your calibration time interval, RIGOL recommends that you
perform complete readjustment within the calibration time limit, which can ensure
the performance of the signal generator until the next calibration.

1.3 Calibration Time

The signal generator can perform auto calibration under the control of the PC. A
complete calibration and verification test under the control of the PC takes about 30
minutes if the instrument has already been warmed up (refer to “Testing Notice”).
It takes about 2.5 hours if you use the recommended testing instruments to adjust
the instrument manually. Note that this manual only introduces manual
calibration.

1.4 Calibration Security

The Calibration password is used to prevent accidental and unauthorized calibration
of the signal generator. The instrument is encrypted when you use it for the first time
and you need to enter the correct password to decrypt the signal generator to
perform calibration.

Press  Test  PassWd to input the correct password and the system displays
“The instrument now is UNSECURED”. At this point, SecOn switches to SecOff as
shown in the figure below.

Figure 1-1 Input the Calibration Password

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The password is set to “12345” when the signal generator is deliveried from the
factory. This password is stored in the non-volatile memory and will not change at
power-off or after remote interface reset.

1.5 Basic Calibration/Adjustment Procedures

The recommended procedures of instrument calibration are presented below. This is
only a general description of a complete calibration and detailed operations will be
presented in “Calibration Process”.

1. Read the “Testing Notice”.

2. Decrypt the signal generator (refer to “Calibration Security”).

3. Press Cal (refer to Figure 1-1) to enter the calibration starting menu.

Figure 1-2 Calibration Starting Menu

Table 1-1 Calibration Starting Menu

Menu Description
Step Select the step of the calibration operation
to be performed.
Start Start to perform the calibration step.
Stop Stop the calibration step and return to the
previous menu.

4. Select Step and use the knob or keyboard to input the calibration step and the
default is “1”. If only the specified N step of the calibration is needed, input the
desired calibration step.

5. Select Start to open the calibration parameter setting menu.

Figure 1-3 Calibration Parameter Setting

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Table 1-2 Calibration Parameter Setting

Menu Description
Step Select the step of the calibration operation to
be performed.
Para Press this key and input the measured value.
Enter Finish the value input of the current step and
enter the next step.

6. The signal generator displays the parameters currently need calibration together
with their default output signal values. To finish a step of calibration, you only
need to read the reading on the testing instrument and press Para to input the
reading. Then, the signal generator will adjust automatically.

7. Press Enter and the instrument enters the next calibration step automatically.

Tip
Select in the “Calibration Parameter Setting” menu to cancel the current
calibration. Select Stop in the “Calibration Starting” menu to stop the calibration.
The instrument will be encrypted automatically after the calibration finishes.

1.6 To Stop the Calibration

You may need to stop the calibration during the calibration process and you can
power off the instrument or press any of the other function keys at the panel to stop
the calibration at any time.

You need to perform the calibration again if the instrument is powered off during the
calibration. The calibration data will be stored in the internal memory if you press any
of the other function keys to stop the calibration and you can re-enter the calibration
interface to execute other calibration steps. The signal generator will store the
calibration constants to the Flash only after you execute the “To Save the
Calibration Data” operation.

Notice
!
If you stop the calibration when the signal generator is writing the
calibration constant to the Flash, you may lost all the calibration constants
and you need to perform all the calibrations again.

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2 Testing Devices and Notice

2.1 Testing Devices

The testing devices recommended to be used to perform the calibration are as
shown in the table below. If you do not have the specified device, use alternative
testing devices with the same accuracy.

Table 2-1 Recommended Testing Devices

Device Specifications Recommended Usage*
Model
Oscilloscope Bandwidth: 300 MHz RIGOL DS1302CA P, T
Sample Rate: 2 GSa/s
Digital AC Volts (True-RMS, AC Coupled) Agilent 34401A P, T
Multimeter Accuracy: ± 0.06% (300 kHz)
(DMM) DC Volts Accuracy: 0.0015%
Resistance Accuracy: 0.002%
Frequency Accuracy: 0.1 ppm Agilent 53131A P, T
Counter
Power Meter Absolute Accuracy: Agilent E4418B P, T
± 0.02dB (log) or ± 0.5% (linear)
Relative Accuracy:
± 0.04dB (log) or ± 1.0% (linear)
Note*: P= Performance Verification, T= Troubleshooting.

2.2 Testing Notice

To get the optimum effect, all the test steps must comply with the following advices:

1. Make sure the temperature of the environment is between 18°C and 28°C. The
calibration should be done in 23°C± 1°C in ideal situation.
2. Make sure the relative humidity of the environment is lower than 80％.
3. Make sure the instrument has been working continuously for 1 hour.
4. The cable used in the test should be as short as possible and the impedance of
the cable should meet the requirement.
5. Only use RG-58 or similar 50 Ω cables.

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3 Calibration Process

The calibration process contains 17 items (3.1 to 3.17). When the calibration begins,
you can choose to start from any of the items but the steps within each single item
must be performed in sequence.

Table 3-1 Calibration Steps Preview

Channel Calibration Steps Name of the Calibration Items
CH1&CH2 1 Self-test
2～3 Frequency (Int) Adjustment
CH1 4～22 AC Amplitude (high-impedance) Adjustment
23～35 offset DAC
36～57 Low Frequency Flatness Adjustment
58～79 Output Impedance Adjustment
80～89 0 dB Range Flatness Adjustment
90～99 +10 dB Range Flatness Adjustment
100～109 +20 dB Range Flatness Adjustment
CH2 304～319 AC Amplitude (high-impedance) Adjustment
323～333 offset DAC
336～350 Low Frequency Flatness Adjustment
355～373 Output Impedance Adjustment
380～389 0 dB Range Flatness Adjustment
390～399 +10 dB Range Flatness Adjustment
CH1&CH2 280～281 Frequency (Ext) Adjustment
285～293 Phase Adjustment
254 Save the calibration data
255 Restore the initial calibration value

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3.1 Self-test
The first step of the calibration is self-test which is used to check whether the signal
generator is working normally.

1. Press  Test  PassWd and enter the password to decrypt the instrument.
Then, press Cal  Start to perform the calibration from the first step.

Table 3-2 Self-test Step

Step Description
1 Perform self-test. The main output is disabled
automatically during the self-test.

2. To continue the calibration, the instrument must be repaired if the self-test of

the signal generator fails.

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3.2 Frequency (Int) Adjustment

The signal generator stores a frequency calibration constant to make sure that the
output is 10 MHz.

1. Set the scale accuracy of the frequency counter as 0.1 ppm and its input
impedance as 50 Ω (connect an external 50 Ω terminal if your frequency counter
does not have a 50 Ω input impedance). The connecting method is as shown in
the figure below.

INPUT

OUTPUT

Figure 3-1 Frequency (Internal Timebase) Adjustment Connection

2. Use the frequency counter to measure the frequency of the output signal.

Table 3-3 Frequency (Internal Timebase) Adjustment Steps

Expected Value Description
Step Frequency Amplitude
2 <10 MHz 1 Vpp Output frequency is slightly
less than 10 MHz
(e.g. 9,999,945.73 Hz)
3[1] ENDSTEP_CAL_FREQ (Frequency adjustment finishes)
[1]
Note : this step is only for display and you need not to input any value. Press Enter to
enter the next step.

3. Press Para and use the keyboard on the panel to input the measurement value.

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3.3 CH1 AC Amplitude Adjustment

AC amplitude adjustment is used to adjust the amplitude accuracy of the AC output
and needs to calibrate all the attenuation channels with high output impedance. The
gain coefficient is obtained through two measurements (first measure the positive
level output from the DAC and then measure the negative level output from the DAC).
Thus, such steps always appear in pairs.

1. Connect the DMM and signal generator as shown in the figure below.

INPUT

OUTPUT

Figure 3-2 AC Amplitude Adjustment Connection

2. Use the DMM to measure the DC voltage output from the signal generator.

3. At the end of each step, select Para to input the measurement value
following the sequence in the table below.

Table 3-4 AC Amplitude Adjustment Steps

Expected Value Description
Step DC Level Output
Impedance
4 0.021 Vpp HighZ Output of -30 dB range
5 0.038 Vpp HighZ Output of -30 dB range
6 0.055 Vpp HighZ Output of -30 dB range
7 0.070 Vpp HighZ Output of -30 dB range
8 0.13 Vpp HighZ Output of -30 dB range
9 0.19 Vpp HighZ Output of -30 dB range
10 0.21 Vpp HighZ Output of -10 dB range
11 0.40 Vpp HighZ Output of -10 dB range
12 0.59 Vpp HighZ Output of -10 dB range
13 0.61 Vpp HighZ Output of 0 dB range
14 1.26 Vpp HighZ Output of 0 dB range

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15 1.9 Vpp HighZ Output of 0 dB range

16 2.1 Vpp HighZ Output of +10 dB range
17 4 Vpp HighZ Output of +10 dB range
18 5.9 Vpp HighZ Output of +10 dB range
19 6.5 Vpp HighZ Output of +20dB range
20 13.2 Vpp HighZ Output of +20 dB range
21 19.9 Vpp HighZ Output of +20 dB range
22[1] ENDSTEP_CAL_ACAMPLITUDE (AC amplitude adjustment
finishes)
[1]
Note : this step is only for display and you need not to input any value. Press Enter to enter
the next step.

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3.4 CH1 Offset DAC

Offset DAC is used to calibrate the DC offset of the main DAC output and needs to
calibrate all the attenuation channels with high output impedance. The offset
coefficient is obtained through two measurements (first measure the positive level
output from the DAC and then measure the negative level output from the DAC).
Thus, such testing steps always appear in pairs.

1. Connect the DMM and the signal generator as shown in the figure below.

INPUT

OUTPUT

Figure 3-3 Offset DAC Connection

2. Use the DMM to measure the DC voltage output from the signal generator.

3. At the end of each step, select Para to input the measurement value
following the sequence in the table below.

Table 3-5 Offset DAC Steps

Expected Value Description
Step DC Level Output
Impedance
23 +0.025 V HighZ Output of -30 dB range
24 -0.025 V HighZ Output of -30 dB range
25 +0.0625 V HighZ Output of -20 dB range
26 -0.0625 V HighZ Output of -20 dB range
27 +0.25 V HighZ Output of -10 dB range
28 -0.25 V HighZ Output of -10 dB range
29 +0.625 V HighZ Output of 0 dB range
30 -0.625 V HighZ Output of 0 dB range
31 +2.5 V HighZ Output of +10 dB range
32 -2.5 V HighZ Output of +10 dB range
33 +6.25 V HighZ Output of +20 dB range

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34 -6.25 V HighZ Output of +20 dB range

35[1] ENDSTEP_CAL_OFFSETDAC (Offset DAC finishes)
Note[1]: this step is only for display and you need not to input any value. Press Enter
to enter the next step.

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3.5 CH1 Low Frequency Flatness Adjustment

Low frequency flatness adjustment is used to adjust the 3 attenuation channels
(using elliptical filter, with low passband ripples, applicable to Sine and Square) and
the other two amplification channels (using linear phase filter, applicable to Ramp,
Noise and arbitrary waveforms) of the signal generator.

1. Set the DMM to measure the Vrms voltage value and connect the instruments as
shown in the figure below.

INPUT

OUTPUT

Figure 3-4 Low Frequency Flatness Adjustment Connection

2. Use the DMM to measure the Sine waveform output from the signal generator.

3. At the end of each step, select Para to input the measurement value
following the sequence in the table below.

Table 3-6 Low Frequency Flatness Adjustment Steps

Output Signal of the Signal Generator Description
Step Type Output Frequency Amplitude
36 Sine HighZ 100 Hz 0.56 Vrms Flatness for 0 dB,
Linear Phase Filter
37 Sine HighZ 1 kHz 0.56 Vrms Flatness for 0 dB,
Linear Phase Filter
38 Sine HighZ 10 kHz 0.56 Vrms Flatness for 0 dB,
Linear Phase Filter
39 Sine HighZ 20 kHz 0.56 Vrms Flatness for 0 dB,
Linear Phase Filter
40 Sine HighZ 30 kHz 0.56 Vrms Flatness for 0 dB,
Linear Phase Filter
41 Sine HighZ 40 kHz 0.56 Vrms Flatness for 0 dB,

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Linear Phase Filter

42 Sine HighZ 100 kHz
0.56 Vrms Flatness for 0 dB,
Linear Phase Filter
43 Sine HighZ 100 Hz 1.7 Vrms Flatness for +10 dB,
Linear Phase Filter
44 Sine HighZ 1 kHz 1.7 Vrms Flatness for +10 dB,
Linear Phase Filter
45 Sine HighZ 10 kHz 1.7 Vrms Flatness for +10 dB,
Linear Phase Filter
46 Sine HighZ 20 kHz 1.7 Vrms Flatness for +10 dB,
Linear Phase Filter
47 Sine HighZ 30 kHz 1.7 Vrms Flatness for +10 dB,
Linear Phase Filter
48 Sine HighZ 40 kHz 1.7 Vrms Flatness for +10 dB,
Linear Phase Filter
49 Sine HighZ 100 kHz 1.7 Vrms Flatness for +10 dB,
Linear Phase Filter
50 Sine HighZ 100 Hz 5.6 Vrms Flatness for +20 dB,
Linear Phase Filter
51 Sine HighZ 1 kHz 5.6 Vrms Flatness for +20 dB,
Linear Phase Filter
52 Sine HighZ 10 kHz 5.6 Vrms Flatness for +20 dB,
Linear Phase Filter
53 Sine HighZ 20 kHz 5.6 Vrms Flatness for +20 dB,
Linear Phase Filter
54 Sine HighZ 30 kHz 5.6 Vrms Flatness for +20 dB,
Linear Phase Filter
55 Sine HighZ 40 kHz 5.6 Vrms Flatness for +20 dB,
Linear Phase Filter
56 Sine HighZ 100 kHz 5.6 Vrms Flatness for +20 dB,
Linear Phase Filter
57[1] ENDSTEP_CAL_LOWFREQFLAT (Low frequency flatness
adjustment finishes)
[1]
Note : this step is only for display and you need not to input any value. Press Enter to
enter the next step.

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3.6 CH1 Output Impedance Adjustment

Output impedance adjustment is used to adjust the output impedance. The
measurement of the output impedance constant uses the distortion filter of the
signal generator and all the six attenuation/amplification channels of the signal
generator.

1. Set the DMM to use AC voltage for measurement. The (CH1) output terminal of
the signal generator is connected to the AC voltage intput terminal of the DMM
via a 50 Ω impedance matcher. The connecting method is as shown in the figure
below.

INPUT

OUTPUT
50 O

Figure 3-5 Output Impedance Adjustment Connection

2. Use the DMM to measure the output voltage of the signal generator according to
each of the output measurements in the table below. The internal resistance of
the signal generator is obtained indirectly through the voltage measurement and
the expected measurement value should be 50 Ω.

3. At the end of each step, select Para to input the measurement value
following the sequence in the table below.

Table 3-7 Output Impedance Adjustment Steps

Step Expected Description (Signal Generator
Value Output)
58 50 Ω 0.038 V
59 50 Ω 0.125 V
60 50 Ω 0.375 V
61 50 Ω 1V
62 50 Ω 1.5 V
63 50 Ω 3V
64 50 Ω 4.5 V

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65 50 Ω 6.5 V
66 50 Ω 11 V
67 50 Ω 0V
68 50 Ω 17 V
69 50 Ω 8.5 V
70 50 Ω 5.5 V
71 50 Ω 3.25 V
72 50 Ω 2.25 V
73 50 Ω 1.5 V
74 50 Ω 0.75 V
75 50 Ω 0.5 V
76 50 Ω 0.187 V
77 50 Ω 0.0625 V
78 50 Ω 0.019 V
79[1] ENDSTEP_CAL_IMPENDANCE (Output impedance
adjustment finishes)
[1]
Note : this step is only for display and you need not to input any value. Press Enter to
enter the next step.

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3.7 CH1 0 dB Range Flatness Adjustment

1. Connect the power meter and signal generator as shown in the figure below.

Power Meter

INPUT

OUTPUT

Figure 3-6 Output Flatness Adjustment Connection

2. Use the power meter to measure the dBm value of the output signal of the
signal generator.

3. At the end of each step, select Para to input the measurement value
following the sequence in the table below.

Table 3-8 0 dB Range Flatness Adjustment Steps

Output Signal of the Signal Generator Description
Step Type Output Frequency Amplitude
80 Sine 50 Ω 100 kHz 2 dBm Flatness for 0 dB, Linear
Phase Filter
81 Sine 50 Ω 500 kHz 2 dBm Flatness for 0 dB, Linear
Phase Filter
82 Sine 50 Ω 1 MHz 2 dBm Flatness for 0 dB, Linear
Phase Filter
83 Sine 50 Ω 5 MHz 2 dBm Flatness for 0 dB, Linear
Phase Filter
84 Sine 50 Ω 10.1 MHz 2 dBm Flatness for 0 dB, Linear
Phase Filter
85 Sine 50 Ω 11.1 MHz 2 dBm Flatness for 0 dB, Linear
Phase Filter
86 Sine 50 Ω 15.1 MHz 2 dBm Flatness for 0 dB, Linear
Phase Filter
87 Sine 50 Ω 18.1 MHz 2 dBm Flatness for 0 dB, Linear
Phase Filter
88 Sine 50 Ω 20.1 MHz 2 dBm Flatness for 0 dB, Linear

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Phase Filter
89[1] ENDSTEP_CAL_ 0dBFLAT (0 dB range flatness adjustment finishes)
[1]
Note : this step is only for display and you need not to input any value. Press Enter to enter
the next step.

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3.8 CH1 +10 dB Range Flatness Adjustment

1. Connect the power meter and signal generator as shown in Figure 3-6.

2. Use the power meter to measure the dBm value of the output signal of the
signal generator.

3. At the end of each step, select Para to input the measurement value
following the sequence in the table below.

Table 3-9 +10 dB Range Flatness Adjustment Steps

Output Signal of the Signal Generator Description
Step Type Output Frequency Amplitude
90 Sine 50 Ω 100 kHz 2 dBm Flatness for 0 dB, Linear
Phase Filter
91 Sine 50 Ω 500 kHz 2 dBm Flatness for 0 dB, Linear
Phase Filter
92 Sine 50 Ω 1 MHz 2 dBm Flatness for 0 dB, Linear
Phase Filter
93 Sine 50 Ω 5 MHz 2 dBm Flatness for 0 dB, Linear
Phase Filter
94 Sine 50 Ω 10.1 MHz 2 dBm Flatness for 0 dB, Linear
Phase Filter
95 Sine 50 Ω 11.1 MHz 2 dBm Flatness for 0 dB, Linear
Phase Filter
96 Sine 50 Ω 15.1 MHz 2 dBm Flatness for 0 dB, Linear
Phase Filter
97 Sine 50 Ω 18.1 MHz 2 dBm Flatness for 0 dB, Linear
Phase Filter
98 Sine 50 Ω 20.1 MHz 2 dBm Flatness for 0 dB, Linear
Phase Filter
99[1] ENDSTEP_CAL_10dBFLAT (+10 dB range flatness adjustment
finishes)
[1]
Note : this step is only for display and you need not to input any value. Press Enter
to enter the next step.

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3.9 CH1 +20dB Range Flatness Adjustment

1. Connect the power meter and signal generator as shown in Figure 3-6.

2. Use the power meter to measure the dBm value of the output signal of the
signal generator.

3. At the end of each step, select Para to input the measurement value
following the sequence in the table below.

Table 3-10 +20 dB Range Flatness Adjustment Steps

Output signal of the signal Generator Description
Step Type Output Frequency Amplitude
100 Sine 50 Ω 100 kHz 2 dBm Flatness for 0 dB, Linear Phase
Filter
101 Sine 50 Ω 500 kHz 2 dBm Flatness for 0 dB, Linear Phase
Filter
102 Sine 50 Ω 1 MHz 2 dBm Flatness for 0 dB, Linear Phase
Filter
103 Sine 50 Ω 5 MHz 2 dBm Flatness for 0 dB, Linear Phase
Filter
104 Sine 50 Ω 10.1 MHz 2 dBm Flatness for 0 dB, Linear Phase
Filter
105 Sine 50 Ω 11.1 MHz 2 dBm Flatness for 0 dB, Linear Phase
Filter
106 Sine 50 Ω 15.1 MHz 2 dBm Flatness for 0 dB, Linear Phase
Filter
107 Sine 50 Ω 18.1 MHz 2 dBm Flatness for 0 dB, Linear Phase
Filter
108 Sine 50 Ω 20.1 MHz 2 dBm Flatness for 0 dB, Linear Phase
Filter
109[1] ENDSTEP_CAL_20dBFLAT (+20 dB range flatness adjustment finishes)
[1]
Note : this step is only for display and you need not to input any value. Press Enter to enter
the next step.

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3.10 CH2 AC Amplitude Adjustment

AC amplitude adjustment is used to adjust the amplitude accuracy of the AC output
and needs to calibrate all the attenuation channels with high output impedance. The
gain coefficient is obtained through two measurements (first measure the positive
level output from the DAC and then measure the negative level output from the DAC).
Thus, such steps always appear in pairs.

1. Connect the DMM and signal generator as shown in the figure below.

INPUT

OUTPUT

Figure 3-7 AC Amplitude Adjustment Connection

2. Use the DMM to measure the DC voltage output from the signal generator.

3. At the end of each step, select Para to input the measurement value
following the sequence in the table below.

Table 3-11 AC Amplitude Adjustment Steps

Expected Value Description
Step DC Level Output
Impedance
304 0.021 Vpp HighZ Output of -30 dB range
305 0.038 Vpp HighZ Output of -30 dB range
306 0.055 Vpp HighZ Output of -30 dB range
307 0.070 Vpp HighZ Output of -20 dB range
308 0.13 Vpp HighZ Output of -20 dB range
309 0.19 Vpp HighZ Output of -20 dB range
310 0.21 Vpp HighZ Output of -10 dB range
311 0.40 Vpp HighZ Output of -10 dB range
312 0.59 Vpp HighZ Output of -10 dB range
313 0.61 Vpp HighZ Output of 0 dB range
314 1.26 Vpp HighZ Output of 0 dB range

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315 1.9 Vpp HighZ Output of 0 dB range

316 2.1 Vpp HighZ Output of +10 dB range
317 4 Vpp HighZ Output of +10 dB range
318 5.9 Vpp HighZ Output of +10 dB range
319[1] ENDSTEP_CAL_ACAMPLITUDE (AC amplitude adjustment
finishes)
Note[1]: this step is only for display and you need not to input any value. Press Enter to enter
the next step.

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3.11 CH2 Offset DAC

Offset DAC is used to calibrate the DC offset of the main DAC output and needs to
calibrate all the attenuation channels with high output impedance. The offset
coefficient is obtained through two measurements (first measure the positive level
output from the DAC and then measure the negative level output from the DAC).
Thus, such testing steps always appear in pairs.

1. Connect the DMM and the signal generator as shown in the figure below.

INPUT

OUTPUT

Figure 3-8 Offset DAC Connection

2. Use the DMM to measure the DC voltage output from the signal generator.
3. At the end of each step, select Para to input the measurement value
following the sequence in the table below.

Table 3-12 Offset DAC Steps

Expected Value Description
Step DC Level Output
Impedance
323 +0.025 V HighZ Output of -30 dB range
324 -0.025 V HighZ Output of -30 dB range
325 +0.0625 V HighZ Output of -20 dB range
326 -0.0625 V HighZ Output of -20 dB range
327 +0.25 V HighZ Output of -10 dB range
328 -0.25 V HighZ Output of -10 dB range
329 +0.625 V HighZ Output of 0 dB range
330 -0.625 V HighZ Output of 0 dB range
331 +2.5 V HighZ Output of +10 dB range
332 -2.5 V HighZ Output of +10 dB range
333[1] ENDSTEP_CAL_OFFSETDAC (Offset DAC finishes)
Note[1]: this step is only for display and you need not to input any value. Press Enter
to enter the next step.

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3.12 CH2 Low Frequency Flatness Adjustment

Low frequency flatness adjustment is used to adjust the 3 attenuation channels
(using elliptical filter, with low passband ripples, applicable to Sine and Square) and
the other two amplification channels (using linear phase filter, applicable to Ramp,
Noise and arbitrary waveforms) of the signal generator.

1. Set the DMM to measure the Vrms voltage value and connect the instruments as
shown in the figure below.

INPUT

OUTPUT

Figure 3-9 Low Frequency Flatness Adjustment Connection

2. Use the DMM to measure the Sine waveform output from the signal generator.

3. At the end of each step, select Para to input the measurement value
following the sequence in the table below.

Table 3-13 Low Frequency Flatness Adjustment Steps

Output Signal of the Signal Generator Description
Step Type Output Frequency Amplitude
336 Sine HighZ 1 kHz Flatness for 0 dB,
0.56 Vrms
Linear Phase Filter
337 Sine HighZ 100 Hz Flatness for 0 dB,
0.56 Vrms
Linear Phase Filter
338 Sine HighZ 10 kHz Flatness for 0 dB,
0.56 Vrms
Linear Phase Filter
339 Sine HighZ 30 kHz Flatness for 0 dB,
0.56 Vrms
Linear Phase Filter
340 Sine HighZ 60 kHz Flatness for 0 dB,
0.56 Vrms
Linear Phase Filter
341 Sine HighZ 80 kHz Flatness for 0 dB,
0.56 Vrms
Linear Phase Filter
342 Sine HighZ 100 kHz 0.56 Vrms Flatness for 0 dB,

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Linear Phase Filter

343 Sine HighZ 1 kHz Flatness for +10 dB,
1.7 Vrms
Linear Phase Filter
344 Sine HighZ 100 Hz Flatness for +10 dB,
1.7 Vrms
Linear Phase Filter
345 Sine HighZ 10 kHz Flatness for +10 dB,
1.7 Vrms
Linear Phase Filter
346 Sine HighZ 30 kHz Flatness for +10 dB,
1.7 Vrms
Linear Phase Filter
347 Sine HighZ 60 kHz Flatness for +10 dB,
1.7 Vrms
Linear Phase Filter
348 Sine HighZ 80 kHz Flatness for +10 dB,
1.7 Vrms
Linear Phase Filter
349 Sine HighZ 100 kHz Flatness for +10 dB,
1.7 Vrms
Linear Phase Filter
[1]
350 ENDSTEP_CAL_LOWFREQFLAT (Low frequency flatness
adjustment finishes)
[1]
Note : this step is only for display and you need not to input any value. Press Enter to
enter the next step.

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3.13 CH2 Output Impedance Adjustment

Output impedance adjustment is used to adjust the output impedance. The
measurement of the output impedance constant uses the distortion filter and all the
six attenuation/amplification channels of the signal generator.

1. Set the DMM to use AC voltage for measurement. The (CH2) output terminal of
the signal generator is connected to the AC voltage intput terminal of the DMM
via a 50 Ω impedance matcher. The connecting method is as shown in the figure
below.

INPUT

OUTPUT
50 O

Figure 3-10 Output Impedance Adjustment Connection

2. Use the DMM to measure the output voltage of the signal generator according to
each of the output measurements in the table below. The internal resistance of
the signal generator is obtained indirectly through the voltage measurement and
the expected measurement value should be 50 Ω.

3. At the end of each step, select Para to input the measurement value
following the sequence in the table below.

Table 3-14 Output Impedance Adjustment Steps

Step Expected Description (Signal Generator
Value Output)
355 50 Ω 0.038 V
356 50 Ω 0.125 V
357 50 Ω 0.375 V
358 50 Ω 1V
359 50 Ω 1.5 V
360 50 Ω 3V
361 50 Ω 4.5 V
362 50 Ω 0V
363 50 Ω 2.25 V

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364 50 Ω 1.5 V
365 50 Ω 0.75 V
366 50 Ω 0.5 V
367 50 Ω 0.187 V
368 50 Ω 0.0625 V
369 50 Ω 0.019 V
370 50 Ω 0V
371 50 Ω 2V
372 50 Ω 2V
373[1] ENDSTEP_CAL_IMPENDANCE (Output impedance
adjustment finishes)
[1]
Note : this step is only for display and you need not to input any value. Press Enter to
enter the next step.

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3.14 CH2 0 dB Range Flatness Adjustment

1. Connect the power meter and signal generator as shown in the figure below.

Power Meter

INPUT

OUTPUT

Figure 3-11Output Flatness Adjustment Connection

2. Use the power meter to measure the dBm value of the output signal of the
signal generator.

3. At the end of each step, select Para to input the measurement value
following the sequence in the table below.

Table 3-15 0 dB Range Flatness Adjustment Steps

Output Signal of the Signal Generator Description
Step Type Output Frequency Amplitude
380 Sine 50 Ω 100 kHz 2 dBm Flatness for 0 dB, Linear
Phase Filter
381 Sine 50 Ω 500 kHz 2 dBm Flatness for 0 dB, Linear
Phase Filter
382 Sine 50 Ω 1 MHz 2 dBm Flatness for 0 dB, Linear
Phase Filter
383 Sine 50 Ω 5 MHz 2 dBm Flatness for 0 dB, Linear
Phase Filter
384 Sine 50 Ω 10.1 MHz 2 dBm Flatness for 0 dB, Linear
Phase Filter
385 Sine 50 Ω 11.1 MHz 2 dBm Flatness for 0 dB, Linear
Phase Filter
386 Sine 50 Ω 15.1 MHz 2 dBm Flatness for 0 dB, Linear
Phase Filter
387 Sine 50 Ω 18.1 MHz 2 dBm Flatness for 0 dB, Linear

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Phase Filter
388 Sine 50 Ω 20.1 MHz 2 dBm
Flatness for 0 dB, Linear
Phase Filter
389[1] ENDSTEP_CAL_ 0dBFLAT (0 dB range flatness adjustment finishes)
[1]
Note : this step is only for display and you need not to input any value. Press Enter to enter
the next step.

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3.15 CH2 +10 dB Range Flatness Adjustment

1. Connect the power meter and signal generator as shown in Figure 3-11.

2. Use the power meter to measure the dBm value of the output signal of the
signal generator.

3. At the end of each step, select Para to input the measurement value
following the sequence in the table below.

Table 3-16 +10 dB Range Flatness Adjustment Steps

Output Signal of the Signal Generator Description
Step Type Output Frequency Amplitude
390 Sine 50 Ω 100 kHz 2 dBm Flatness for 0 dB, Linear
Phase Filter
391 Sine 50 Ω 500 kHz 2 dBm Flatness for 0 dB, Linear
Phase Filter
392 Sine 50 Ω 1 MHz 2 dBm Flatness for 0 dB, Linear
Phase Filter
393 Sine 50 Ω 5 MHz 2 dBm Flatness for 0 dB, Linear
Phase Filter
394 Sine 50 Ω 10.1 MHz 2 dBm Flatness for 0 dB, Linear
Phase Filter
395 Sine 50 Ω 11.1 MHz 2 dBm Flatness for 0 dB, Linear
Phase Filter
396 Sine 50 Ω 15.1 MHz 2 dBm Flatness for 0 dB, Linear
Phase Filter
397 Sine 50 Ω 18.1 MHz 2 dBm Flatness for 0 dB, Linear
Phase Filter
398 Sine 50 Ω 20.1 MHz 2 dBm Flatness for 0 dB, Linear
Phase Filter
399[1] ENDSTEP_CAL_10dBFLAT (+10 dB range flatness adjustment
finishes)
[1]
Note : this step is only for display and you need not to input any value. Press Enter
to enter the next step.

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3.16 Frequency (Ext) Adjustment

1. Set the scale accuracy of the frequency counter as 0.1 ppm and its input
impedance as 50 Ω (if your frequency counter does not have a 50 Ω input
impedance, you need to connect an external 50 Ω terminal). The connecting
method is as shown in the figure below. Connect the 10 MHz Out of the
frequency counter with the 10 MHz In of the signal generator and the CH1 output
terminal of the signal generator with the input terminal of the frequency counter.

Figure 3-12 Frequency (External Timebase) Adjustment Connection

2. Use the frequency counter to measure the output frequency of the signal
generator.

Table 3-17 Frequency (Internal Timebase) Adjustment Steps

Expected Value Description
Step Frequency Amplitude
280 <10 MHz 1 Vpp Output frequency is slightly
less than 10 MHz
(e.g. 9,999,945.73 Hz)
281[1] ENDSTEP_CAL_FREQ (Frequency adjustment finishes)
[1]
Note : this step is only for display and you need not to input any value. Press Enter to
enter the next step.

3. Press Para and use the keyboard on the panel to input the measurement value.

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3.17 Phase Adjustment

1. Set the input impedance of the oscilloscope to 50 Ω (if your oscilloscope does
not have a 50 Ω input impedance, use external terminal). Connect the two
output terminals of the signal generator to two input channels of the
oscilloscope respectively. The connecting method is as shown in the figure
below.

Figure 3-13 Phase Adjustment Connection

2. First, please send the following commands to the signal generator via the
remote interface:
OUTPUT:LOAD INFINITY
OUTPUT:LOAD:CH2 INFINITY
APPLY:SIN 1KHZ,5VPP,0
APPLY:SIN:CH2 1KHZ,5VPP,0
OUTPUT ON
OUTPUT:CH2 ON

The signal generator will exit the calibration interface (the previous calibration
parameters are still stored in the internal memory) after receiving the
above-mentioned commands.

3. Re-enter the calibration interface (press  Test  PassWd and enter the
password to decrypt the signal generator. Then press Cal Step). Perform the
relative operations following the sequence in the table below and press Para at
the end of each step to input the measurement value (A-B).

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Table 3-18 Phase Adjustment Steps

Step Description
285 Send the following commands to the oscilloscope via the
remote interface:
:TIM:SCAL 0.000000500
:STOP
:MEASURE:EDGEP1_X? CHANNEL1——record the
current A value
:MEASURE:EDGEP1_X? CHANNEL2——record the
current B value
Input the A-B result into the signal generator (in s).
286 The same as 285.
287 The same as 285.
288 The same as 285.
289 The same as 285.
290 The same as 285.
291 The same as 285.
292 The same as 285.
293[1] ENDSTEP_CAL_FREQ (Frequency adjustment finishes)
[1]
Note : this step is only for display and you need not to input any value. Press Enter to
enter the next step.

At this point, all the calibration operations are finished.

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4 To Save the Calibration Data

Table 4-1 To Save the Calibration Data

Step Description
254 Perform this step to save the calibration data to the non-volatile
memory of the instrument after finishing “Calibration Process”.

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5 To Restore Initial Calibration Value

Table 5-1 To Restore Initial Calibration Value

Step Description
255 The signal generator has an initial calibration value (empirical
value, not factory default). Perform this step to restore the default
calibration value. It is recommended that users perform the
complete “Calibration Process” to get more accurate output.

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6 Calibration Prompting Messages

The following prompting messages may appear during the calibration.

1. Performing Self-Test, Please wait...

The system needs some time to finish the self-test, so please wait patiently.

2. Self-Test Passed.
This message is displayed if the system passes the self-test successfully.

3. The instrument now is UNSECURED.

After the message is displayed to indicate that the correct password has been
input, users can perform the calibration operation and at this point, the
instrument is unsecured.

4. Performing Calibration, Please wait....

The instrument enters the calibration execution menu to prepare to start the
calibration, so please wait patiently.

5. Incorrect secure code, please try again.

Users need to input the secure code to calibrate the signal generator. The
entered secure code is incorrect and users need to enter the correct code.

6. Please first complete step**.

If users want to finish the selected calibration step during the calibration of the
instrument, they must start from step **.

DG1022 Calibration Guide 6-1