Agilent Technologies E1346A Instrukcja Obsługi Pobierz pdf (Strona 34)

Test 2-2: DC

Isolation Test

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

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

to GU (GUARD). This test uses the test fixture (see Figure 2-1).

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 2-2 should be >1.2 G

Ω.

HI to Chassis Isolation 1. Make hardware connections as shown in Figure 2-9

Set DMM to 2-wire ohms, 1 G Ω range

3. Send CLOS (@100,108,116,193) to close all Tree relays

4. Trigger the DMM with TRIG SGL

5. Record the DMM reading on Table 2-2 (HI to CHASSIS)

HI to LO Isolation 1. Make hardware connections as shown in Figure 2-10

2. Trigger the DMM with TRIG SGL

3. Record the DMM reading on Table 2-2 (HI to LO)

Figure 2-9. HI to Chassis Isolation Connections

2-16 Verification Tests

1 2 ... 29 30 31 32 33 34 35 36 37 38 39 ... 65 66

Brak uwag

Agilent Technologies E1346A Instrukcja Obsługi Strona 34