Specifications

Bridge Excitation Voltage
The Bridge Excitation Voltage diagnostic accessed through internal
channel 15 measures the bridge excitation voltage (Vs).
Set Up If the bridge excitation voltage is externally supplied, connect the supply to
the terminal module as shown in Figure C-1. Set the voltage to 5.0V.
If the bridge excitation voltage is internally supplied, ensure the jumpers on
the multiplexer component assembly are set correctly (Chapter 1).
Procedure Measure the bridge excitation voltage on internal channel 15.
MEASure:VOLT:DC? (@115)
The following example measures the bridge excitation voltage. The
program assumes the excitation voltage is externally supplied and that the
strain gage multiplexer is used with the HP E1326B/E1411B Multimeter as
part of a scanning multimeter instrument. The computer syntax used is HP
BASIC running on a Hewlett-Packard Series 300 computer.
!Clear and reset the multimeter.
CLEAR 70903
OUTPUT 70903;"*RST"
!Measure the bridge excitation voltage on internal channel 15.
OUTPUT 70903;"MEAS:VOLT:DC? (@115)"
ENTER 70903;Excit_volt
!Print the bridge excitation voltage.
PRINT “Excitation voltage = ”;Excit_volt
END
A typical output from this program is:
Excitation voltage = 5.0519
When measuring the internally supplied excitation voltage on the FET
multiplexers, the voltage is typically 4.6V.
118 Strain Gage Diagnostics Appendix C
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