User manual

54 Using the Relay Multiplexer Chapter 2
For this example, the multiplexer module is configured to test a 4-conductor
cable. Jumper JM1 must be removed to isolate the cable test terminal.
Jumpers JM2 and JM3 must be removed to isolate bank 0 from bank 2.
Figure 2-10 shows how to connect the cable under test and the multimeter
to the multiplexer. This example uses GPIB select code 7, primary address
09, and secondary address 03 for the multimeter and GPIB select code 7,
primary address 09, and secondary address 14 for the multiplexer.
In the program, lines 10-30 set up multimeter for resistance measurement.
Lines 40-50 reset multiplexer and switch banks 0-3 to analog bus. Lines
60-180 measure continuity of cable. The first loop pass measures wires 1
and 3 and the second loop pass measures wires 2 and 4.
Lines 190-420 measure insulation (short-circuit) of cable. The first loop pass
measures wires 1 to 3, 2 to 3, 2 to 4, 1 to 4, and 1 to 2. The second loop pass
measures wires 3 to 1, 4 to 1, 4 to 2, 3 to 2, and 3 to 4.
Figure 2-10. Example: Cable Testing
H
L
BNK 0 COM
H1(1W HI COM)
L1(1W LO COM)
H1
L1
G
BNK 0 CH 1H
BNK 0 CH 1L
BNK 0 CH 2H
BNK 0 CH 2L
BNK 2 CH 1H
BNK 2 CH 1L
BNK 2 COMH
BNK 2 COML
BNK 2 CH 2H
BNK 2 CH 2L
CABLET
1W LO REF
WIRE 1
WIRE 2
WIRE 3
WIRE 4
CABLE UNDER TEST
USER WIRING
G
L2
H2
ANALOG BUS
TO SYSTEM MULTIMETER
TO EXTERNAL MULTIMETER
H1
L1
G
H1
L1
G
H2
L2
G
H2
L2
G
JM10
JM11
JM3JM2JM1
JM13
JM12
OPEN
CLOSE
CLOSE
OPEN
CH 0994
CH 0992
CH 0990
CH 0991
CH 0995
SWITCH CARD
TERMINAL MODULE