User manual

Using the Relay Multiplexer 53Chapter 2
Example: Cable Testing You can connect and test multi-conductor cables or wiring harness
conductors (for continuity) and insulators (for short circuit) using a single
multiplexer module and system multimeter module.
Use the OPEN/CLOS <channel_list> commands to switch the control
relays. For example, to close control relay 0992 (connect banks 0-3 to
analog bus), execute CLOS (@10992).
The E1411B multimeter can directly measure channels of single or multiple
multiplexer modules in a scanning multimeter configuration. The multimeter,
when correctly programmed, automatically closes the appropriate control
relays (0990-0996). For more information, see the E1326B/E1411B User’s
Manual.
The cable test example that follows can be expanded to test cables with
more than 4 conductors. Continuity is checked by closing additional channel
relays to test the odd numbered wires on the first loop pass, and the even
numbered wires on the second loop pass (lines 60-180). Insulators are
checked in groups of four wires by adding another loop (similar to lines 210
to 420).
Figure 2-9. Example: Connecting the Analog Bus
H
L
COM
L
H
CH0
BANK 0
SWITCH CARD TERMINAL MODULE
H
L
L
H
1 IN
2 IN
1 OUT
2 OUT
NO CONNECTION
3 IN
NO CONNECTION
3 OUT
BANK 4
COM
CH0
GUARD
H1 L
H1 H
OPEN
CLOSE
CLOSE
OPEN
CH0990
CH0991
CH0992
CH0996
ANALOG BUS
CABLE TEST
JM1