User manual

Test 2-2. Testing Control Relays
The E1460-66201 relay module has seven control relays (numbered 0990
to 0996). See the Agilent E1460A User’s Manual for information about the
use of these relays.
There is no simple method for testing all of these control relays, and they
are unlikely to wear out under normal use. However, if you need to test one
or more of these relays, use Table 2-2 and Figure 2-4 to measure the
resistance across the contact(s) in question. Table 2-2 shows the channel
numbers, the reference designators, and the recommended test connections
to check each relay. The SCPI commands to open and close each contact
are given in the right-hand columns.
The DMM can be used in two-wire mode for a functional check, or in
four-wire mode for a more accurate measurement. Use the following
procedure to check one or more control relays.
Test Procedure 1. Connect the DMM as specified in Table 2-2 (see Figure 2-4).
2. Close the contact to be tested using the SCPI command given in
Table 2-2.
3. Trigger the DMM and verify that the resistance is low
(less than 3.5
Ω).
4. Open the contact using the SCPI command given in Table 2-2.
5. Trigger the DMM and verify that an open circuit is indicated
(>500 M
Ω).
Figure 2-4. Agilent E1460A Control Relay Test Connections
24 Verification Tests Agilent E1460A Service Manual