Specifications

Multi-Channel 1/4 Bridge Measurements

This program makes

⁄

bridge strain measurements on channels 0, 1, and 2

of multiplexer card number 1.

!Dimension a computer variable to store the strain measurements.

DIM Strn_rdgs(1:3)

!Clear and reset the multimeter.

CLEAR 70903

OUTPUT 70903;"*RST"

!Specify the gage factor for each channel measured.

OUTPUT 70903;"STR:GFAC 2.11E-6,(@100:102)"

!Measure the unstrained reference for each channel.

OUTPUT 70903;"CAL:STR (@100:102)"

DISP "Add tension to the specimen; then press ’Continue’"

PAUSE

DISP ""

!Measure the strain on the specified channels. Enter and display the readings.

OUTPUT 70903;"MEAS:STR:QUAR? (@100:102)"

ENTER 70903;Strn_rdgs(*)

PRINT Strn_rdgs(*)

END

Comments • The wiring diagram used for this example is on page 28.

• Specifying the gage factor as 2.11E-6 returns the strain

measurements in microstrain.

• A gage factor must be specified and an unstrained reference must be

measured for each channel.

36 Making Strain Gage Measurements Chapter 3

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