Specifications

Procedure 1. Measure the voltage on the upper bridge leg.
MEASure:VOLT:DC? (@111)
2. Measure the voltage on the lower bridge leg.
MEASure:VOLT:DC? (@110)
3. Calculate the ratio of upper bridge leg to lower bridge leg voltages.
The following example determines the internal half bridge voltage ratio.
The program assumes 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 voltage across the upper leg of the internal
1
⁄
2
bridge resistor.
OUTPUT 70903;"MEAS:VOLT:DC? (@111)"
ENTER 70903;V_upper
!Measure the voltage across the lower leg of the internal
1
⁄
2
bridge resistor.
OUTPUT 70903;"MEAS:VOLT:DC? (@110)"
ENTER 70903;V_lower
!Compute the ratio of the upper bridge leg voltage to the lower bridge leg voltage.
V_ratio=V_upper/V_lower
PRINT “V_upper to V_lower ratio = ”;V_ratio
END
A typical output from this program is:
V_upper to V_lower ratio = .999935
112 Strain Gage Diagnostics Appendix C
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