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44 U2751A User’s and Service Guide
4 Service Information
Checking Defective Relay(s)
To check for any defective relay, the equipment required is a
digital multimeter with continuity feature.
1 Close the particular relay(s). For example: The relay
located at Row x Column y.
2 By referring to the connector configuration of the DSub
connector, connect one of the DMM test leads to pin RxL
and another test lead to pin CyL. The DMM should
indicate that these two pins are connected or shorted.
3 Once this is done, use the same method and perform the
same test on pins RxH and CyH. These two pins should
be connected or shorted as well.
4 Now, open the particular relay(s). Using the same method,
check if pins RxL and CyL are disconnected. Perform the
same test on pins RxH and CyH as well.
Figure 4-4 Defective relay(s) check
NOTE
It is recommended to have the relay(s) checked when it reaches 10 million
cycle counts. The relay cycle count can be obtained by using the Agilent
Measurement Manager or sending the following SCPI command:
DIAGnostic:RELay:CYCLes? (@<ch_list>)
Row 1
Column 1