1
Performance Verification and Adjustments
40
Keysight 8990B Service Guide
Test procedure
1
Assemble the test equipment as shown in
.
Figure 1-9
Offset accuracy verification setup
2
Set the digital multimeter to measure DC voltage.
3
Press
Default Setup
on the 8990B to set the 8990B to its default settings, and
turn on video input channel 2.
4
Enable averaging and set the average count to 256.
5
Set the input impedance for the video input channel 2 to 50
Ω
.
6
Set the vertical scale for the video input channel 2 to 10 mV/div.
7
Set the video input channel 2 offset to 120 mV.
8
Set the DC power supply to output
±
120 mV as shown in
9
Press
Clear Display
, and wait for the average count to reach 256.
10
Record the voltage reading at the digital multimeter in V
DMM+
and V
DMM–
respectively in
11
Record the mean value of the average reading at the 8990B in V
scope+
and
V
scope–
respectively in
8990B
34410A/3458A
6614C
Содержание 8990B
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