Specifications

Dynamic Strain Measurements
This program makes 2,000
1
⁄
4
bridge strain measurements over a period of
one second. The measurements are made on channel 0 of multiplexer card
number 1.
!Dimension computer variables to store the data header and readings. Assign
!an input/output path between the multimeter and computer. This is a path for
!data in the REAL 64 format. Clear the path and reset the multimeter.
DIM Ndig$[1],Count$[9],Strn_rdgs(1:2000)
ASSIGN @Dmm TO 70903;FORMAT OFF
CLEAR @Dmm
OUTPUT 70903;"*RST"
!Specify the gage factor for the channel measured.
OUTPUT 70903;"STR:GFAC 2.11E-6,(@100)"
!Measure the channel’s unstrained reference.
OUTPUT 70903;"CAL:STR (@100)"
DISP "Add tension to the specimen; then press ’Continue’"
PAUSE
DISP ""
!To increase throughput speed, specify the multimeter’s REAL 64 data format
!and turn off the mainframe display. Configure the multimeter for
1
⁄
4
bridge
!strain measurements on channel 0. To achieve 2000 measurements in 1
!second, specify a fixed (lowest) range, set the aperture time to accept the
!necessary sample period, turn autozero off, specify the number of
!measurements to be taken, and specify the source of the sample signal and the
!sample period.
OUTPUT 70903;"FORM REAL,64"
OUTPUT 70903;"DISP:MON OFF"
OUTPUT 70903;"CONF:STR:QUAR (@100)"
OUTPUT 70903;" VOLT:RANG MIN"
OUTPUT 70903;" VOLT:APER 100E-6"
OUTPUT 70903;" CAL:ZERO:AUTO OFF"
OUTPUT 70903;" SAMP:COUN 2000"
OUTPUT 70903;" SAMP:SOUR TIM"
OUTPUT 70903;" SAMP:TIM 500E-6"
!Measure the strain on the specified channel.
OUTPUT 70903;"INIT"
OUTPUT 70903;"FETC?"
!Enter and display the readings.
ENTER @Dmm USING "#,X,K,K";Ndig$;Count$[1;VAL(Ndig$)]
ENTER @Dmm;Strn_rdgs(*)
ENTER @Dmm
PRINT Strn_rdgs(*)
END
Chapter 3 Making Strain Gage Measurements 37
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