Service manual

HI to GU Isolation
1. Make hardware connections as shown in Figure 2-11
2. Trigger the DMM with
TRIG SGL
3. Record the DMM reading on Table 2-2 (HI to GU)
Example: DC Isolation
Test
This example performs DC Isolation Tests for HI to Chassis, HI to LO, and
HI to GU (GUARD).
10 !RE-SAVE "DC_ISOL"
20 ASSIGN @Dmm TO 722
30 ASSIGN @Mux TO 70914
40 DISP CHR$(129)
50 DIM Conn$(5)[10]
60 DATA CHASSIS, LO, GU, CHASSIS, COMMON LO, COMMON GU
70 READ Conn$(*)
80 OUTPUT @Dmm;"OHM 1E9"
90 PRINT "Equipment Connections "
100 PRINT
110 PRINT " 1. Turn Mainframe power OFF"
120 PRINT " 2. Install E1345A Component Assembly into Mainframe "
130 PRINT " 3. Attach Test Fixture to Component Assembly"
140 PRINT " 4. Turn Mainframe power ON"
150 PRINT " 5. Press Continue when ready to begin testing "
Continued on Next Page
Figure 2-11. HI to GU Isolation Connections
Chapter 2 Verification Tests 35