Performance Verification and Adjustments
1
Keysight 8990B Service Guide
37
Figure 1-8
Impedance verification setup
7
Press
Default Setup
on the 8990B to set the 8990B to its default settings.
8
Set the vertical scale for the video input channel 2 to 10 mV/div.
9
Set the input impedance for the video input channel 2 to 50
Ω
. and verify the
resistance reading with 50
Ω
±1.25
Ω.
10
Measure and record the resistance reading from the multimeter in
.
11
Repeat
for the rest of the vertical scale setting in
12
Repeat
with the input impedance set to 1 M
Ω
. and verify the
resistance reading with 1 M
Ω
±10 k
Ω
.
13
Repeat
for the video input channel 3 of the 8990B.
14
Compare the recorded values with the specification values as listed in
. If the test fails, refer to
8990B
Four-wire resistance
connections
34410A
Table 1-3
Test record for impedance verification
Input impedance Vertical scale
Video input
channel 2
Video input
channel 3
Limits
50
Ω
0.01 V/div
48.75
Ω
to 51.25
Ω
50
Ω
0.02 V/div
48.75
Ω
to 51.25
Ω
Содержание 8990B
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