Specifications

Procedure
Note This diagnostic requires that an internal channel (12 or 13) be closed with a
bridge completion channel (0-7) simultaneously. Since the FET multiplexer
can close only one channel at a time, the shunt verification diagnostic is
only used with the relay strain gage multiplexers.
1. Measure the unstrained reference voltage on the bridge completion
channel which the diagnostic is performed.
CALibration:STRain (@channel)
2. Measure the simulated tension strain.
MEASure:STRain:QTENsion? (@channel)
The channel specified is the bridge completion channel (0-7).
Internal channel 13 is closed automatically by the command.
3. Measure the simulated compressive strain.
MEASure:STRain:QCOMpression? (@channel)
The channel specified is the bridge completion channel (0-7). Internal
channel 12 is closed automatically by the command.
The following example measures the simulated tension and compression
strain. The program assumes the relay 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 unstrained reference voltage on the bridge output channel used.
OUTPUT 70903;"CAL:STR (@100)"
!Measure the simulated tension strain on the bridge output channel.
OUTPUT 70903;"MEAS:STR:QTEN? (@100)"
ENTER 70903;Tension
!Measure the simulated compressive strain on the bridge output channel.
OUTPUT 70903;"MEAS:STR:QCOM? (@100)"
ENTER 70903;Compress
!Display the tension and compression shunt in microstrain.
PRINT “Tension shunt = ”;Tension*1.E+6
PRINT
PRINT “Compression shunt = ”;Compress*1.E+6
END
A typical output from this program is (HP E1356A used):
Tension shunt = 3170.007
Compression shunt = -2967.231
Appendix C Strain Gage Diagnostics 115
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