Specifications

Internally Supplied
Bridge Excitation
Voltage
A feature of the strain gage multiplexer is the availability of an internally
supplied bridge excitation voltage. This voltage, which drives the
multiplexer’s Wheatstone Bridge strain measurement circuitry (Chapter 4),
is capable of driving eight channels of full bridge measurements.
Relay Multiplexer
Excitation Voltage
The internal bridge excitation voltage for the HP E1355A/E1356A relay
strain gage multiplexers is +5V, fused at 4A. This voltage is accessed by
installing jumpers on the component assembly as indicated in Figure 1-4.
Note, however, that this signal may not be stable enough or pure enough for
some strain measurements.
CAUTION If jumpers are installed and then the +5V Bridge Excitation is
shorted, the main fuse on the PC board may blow and reset the
mainframe. This would set all instruments in the mainframe to
their power-on state. To increase protection, install a one amp
fuse (HP part number 2110-0665) in place of the wire short.
When the relay multiplexers are shipped from the factory, the jumpers are
not installed. Thus, the excitation voltage must be externally supplied as
explained in Chapter 2.
Figure 1-4. Internally Supplied Bridge Excitation Voltage
18 Getting Started with the Strain Gage Multiplexers Chapter 1
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