Programming instructions

Verification Tests 67
8. Successively press Step while observing the displays on the Agilent
3499A/B/C and the Multimeter. The Agilent 3499A/B/C’s display
should show a number corresponding to the closed relay. The clumsy
damaged relay(s) can be isolated in this way.
Correction If during Step 8, one or more relays did not close as described, a problem
exists either in the Controller board or the related Matrix module. Replace
this Matrix with another same one and perform the tests as described above
to isolate the problem.
If during Step 8, the appropriate relays closed, but one or more of the
resistances were higher than 1Ω, the corresponding relay is defective.
If the Matrix module(s) is defective, replace it with a new one (the relays are
not replaceable parts, refer to Chapter 6 on Page 85 for more information).
Digital I/O Modules Verification Tests
Four digital I/O (DIO) modules are available with the Agilent 3499A/B/C:
Agilent 44474A 16-bit DIO module;
Agilent N2263A 32-bit DIO module;
Agilent N2264A Multifunction module (16-bit DIO Function);
Agilent N2265A Multifunction module (16-bit DIO Function);
Agilent N2269A Multifunction module (16-bit DIO Function).
Test Fixture The test fixture can be constructed by configuring the related DIO module’s
removable wiring terminal block as shown in Figure 4-4.