Service manual

Test 2-1:
Closed Channel
Resistance Test
This test verifies that all relay contacts meet the closed-channel resistance
specification for the module. When making the Closed Channel Resistance
Test, the HI and LO paths relay contacts are tested independently. This test
uses the test fixture (see Figures 2-1, 2-2, or 2-3). The end-of-life Closed
Channel resistance specification for each relay contact is 2.7
Ω..
NOTE
Closed channel resistance for new relays should be <1.8
Ω . If you are
testing new relays and the resistance is >1.8
Ω., you may want to check the
relays, see Chapter 4 — Service.
Column HI to Row HI
Measurements
1. Make Hardware Connections
• Turn mainframe power OFF
• Connect DMM leads as shown in Figure 2-4
• Set DMM to measure 4-wire Ohms
• Turn mainframe power ON
Figure 2-4. Column HI to Row HI Test Connections
Agilent E1465A/66A/67A Service Manual Verification Tests 23