Specifications

Specification The nominal values of simulated tensile and compressive strain are given in
Table C-2. Note that lead resistance between the strain gage and the bridge
completion circuitry will affect the readings associated with the
compression diagnostic for all bridge arrangements, and the tension
diagnostic for full bridge arrangements.
Table C-2. Simulated Tension and Compression Strain Values
Channel Diagnostic Compression
Nominal Nominal
HP E1355A 3170 -1026
HP E1356A 3170 -2967
NOTES:
1. For full bridge arrangements only, add 12.5µε for each ohm of lead resistance. For
lead resistances <1 ohm, multiply the resistance by 12.5 to determine the amount
of correction.
2. For all arrangements, subtract 16.7µε for each ohm of lead resistance. For lead
resistances <1 ohm, multiply the resistance by 16.7 to determine the amount of
correction.
3. All values are in µε.
To increase measurement accuracy, leadwire corrections are included in the
table (under Notes) to compensate for leadwire resistances. Refer to the
Leadwire Resistance diagnostic to determine the leadwire resistance of your
bridge arrangement. (Determining the leadwire resistance is not a
prerequisite for this diagnostic.)
Set Up To perform the shunt verification diagnostic, your system should be
configured as follows:
1. Connect the bridge excitation voltage to the terminal module as
shown in Figure C-1. Set the voltage to 5.0V.
2. Connect the bridge arrangement(s) (
1
⁄
4
,
1
⁄
2
, or full) to undergo the
diagnostic to the bridge completion channels.
3. Place the specimen in a constant (preferably unstrained) state
throughout the procedure.
CAUTION Use care when externally supplying the bridge excitation
voltage. Voltages greater than 5.4V may damage the bridge
completion resistors.
114 Strain Gage Diagnostics Appendix C
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