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Replacement
Strategy
NOTE
Multiplexer Descriptions
NOTE
E1343A/44A
Descriptions
E1345A/47A
Descriptions
E1355A/56A
Descriptions
Chapter 1
The replacement strategy also depends on the application. If some relays are
used more often, or at higher load, than the others, the relays can be
individually replaced as needed. If all of the relays see similar loads and
switching frequencies, then replace the entire circuit board when the relay
end-of-life approaches. The sensitivity of the application should be weighed
against the cost of replacing relays with some useful life remaining.
Relays that wear out normally or fail due to misuse should not be considered
defective and are not covered by the product's warranty.
The relay multiplexers are "instruments" in the slots of a VXIbus
mainframe. As such, a multiplexer is assigned an error queue, input and
output buffers, and a status register.
Instruments are based on the logical addresses of the plug-in modules. Refer
to the configuration guide provided with your system for information on
setting the addresses to create an instrument.
Both modules provide sixteen 3-wire or eight 4-wire multiplexer channels
and can switch voltages up to 250VDC or VACrms. The E1344A provides
a thermistor reference junction on the terminal card for thermocouple
measurements. Both modules use the E1343A relay component module but
they have different terminal card assemblies.
The E1345A and E1347A multiplexers provide multiplexing for up to 16
channels (channels 00 through 15). Each channel has HIGH (H), LOW (L),
and GUARD (G) connections. The two multiplexers are identical, except
that the E1347A terminal card assembly adds a thermistor for temperature
measurement applications.
The E1355A and E1356A strain gage multiplexers (when used with a
multimeter) provide static and dynamic strain measurement capabilities.
Each multiplexer provides switching (multiplexing) for up to 8 channels
(channels 00 through 07). Each channel has HIGH (H), LOW (L), GUARD
(G), +E, -E1, and -E2 connections. The two multiplexers are identical,
except that the E1355A uses 120Ω bridge resistors, and the E1356A uses
350Ω bridge resistors.
General Information 15
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