Service manual

Test 2-2: DC

Isolation Test

This test verifies that sufficient DC isolation exists at various points on the

Module. DC Isolation is checked from HI to LO, HI to Chassis, and LO to

Chassis. This test uses the test fixture (see Figures 2-1, 2-2, or 2-3).

NOTE

The DMM used should be capable of measuring at least 1 G

Ω.. If the DMM

indicates an overload, record the reading as >Rmax, where Rmax is the

highest resistance that the DMM can measure. For example, if the DMM is

an Agilent 3458A, a typical return for an overload is 1.E+38 and the entry

in Table 2-1 should be >1.2 G

Ω..

HI to LO Isolation 1. Make hardware connections as shown in Figure 2-6

Set DMM to 2-wire ohms, 1 G Ω range

3. Send CLOS (@10000:1rrcc) to the matrix to close all relays

where rr = highest row number and cc = highest column number

For E1465A, rr = 15 and cc = 15

For E1466A, rr = 03 and cc = 63

For E1467A, rr = 07 and cc = 31

4. Trigger the DMM with TRIG SGL

Figure 2-6. HI to LO DC Isolation Test Connections

Agilent E1465A/66A/67A Service Manual Verification Tests 29