Impedance Verification; Figure 1-7 Timebase Frequency Accuracy Verification Setup - Keysight 8990B Service Manual

Symmetricom 58503B
53132A
Figure 1-7
5 Enable the path that routes the time base signal to the trigger output
6 Measure the frequency of the signal at the trigger output connector using the
No adjustment is available for this test if it fails. Refer to
NOTE
"Troubleshooting

Impedance verification

The impedance verification checks the input impedance of the vertical inputs. A
four-wire measurement is used to accurately measure the 50 Ω and 1 MΩ inputs.
Required test equipment:
– 1 unit of 34410A digital multimeter
– 2 units of 10503A BNC cable
– 1 unit of BNC tee adapter (1250-0781)
– 2 units of BNC to dual banana adapter (1251-2277)
Keysight 8990B Service Guide
Timebase frequency accuracy verification setup
connector with the following command.
SERV:BIST:TBAS:STAT ON
53132A.
Guide".
Performance Verification and Adjustments
Trigger
output
8990B
PC
Chapter 3,
1
35