Figure 1-9 Offset Accuracy Verification Setup - Keysight 8990B Service Manual

1 Performance Verification and Adjustments
Test procedure
1 Assemble the test equipment as shown in
Figure 1-9
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
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
11 Record the mean value of the average reading at the 8990B in V
40
6614C
34410A/3458A
Offset accuracy verification setup
turn on video input channel 2.
respectively in Table
V respectively in
scope–
1-4.
Table 1-4.
Figure 1-9.
8990B
Table
DMM+
Keysight 8990B Service Guide
1-4.
and V
DMM–
and
scope+