Service manual
Terminal Module
Description
The terminal module provides connections from user devices to the
multiplexer. The terminal module also provides connections for
multimeters, voltmeters, counters, and other measuring devices. For
the E1347A only, a thermistor is mounted on the terminal module.
Terminal module connections include H, L, and G terminals for Channels
00 - 15, Bank 0 and Bank 1 Commons, and the AT and BT Tree Switches.
In addition, each channel H line has a jumper on the terminal module that
can be removed to add filter components, attenuators, or current shunts.
E1355A/56A Strain
Gage Multiplexer
Descriptions
The E1355A and E1356A multiplexers, together with an E1326B or
E1411B multimeter, provide static and dynamic strain measurement
capabilities for an Agilent 75000 Series B or 75000
Series C VXIbus system.
The E1355A and E1356A multiplexer are B-Size, 8-Channel, 120Ω and
350Ω relay strain gage multiplexers respectively. See Figure 4-2 for a block
diagram of the E1355A 120 Ohm Relay Strain Gage Multiplexer. The
block diagram shows a 1/4 bridge arrangement.
Each strain gage multiplexer provides switching (multiplexing) of up to
eight channels. Each channel has HIGH (H), LOW (L), GUARD (G), +E,
-E1, and -E2 connections to provide 1/4, 1/2, or full bridge arrangements.
See the E1355A - E1358A Strain Gage Multiplexers User’s Manual for a
complete description of strain gage bridge arrangements.
The strain gage multiplexer module consists of a component assembly and a
terminal module. The component assembly is the same for the E1355A and
E1356A multiplexer modules. The only difference between the two
component assemblies is their jumper settings. The E1355A has an
E1355-80001 terminal module and the E1356A has an E1356-80001
terminal module.
Component Assembly
Description
Relay switches and relay control logic are located on the E1345A
Component Assembly. The component assembly can be configured to
provide the strain gage excitation voltage, or this voltage can be supplied
by the user. Refer to the E1355A - E1358A Strain Gage Multiplexers
User’s Manual for information on bridge excitation voltage configurations.
Table 4-1 summarizes the functions of each relay on the component
assembly.
Chapter 4 Service 53