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3. Press Range and use the knob or the front panel arrow keys to specify the measurement range. Auto
(autorange) automatically selects the range for the measurement based on the input. Autoranging is con-
venient, but it results in slower measurements than using a manual range. Autoranging goes up a range at
120% of the present range, and down a range below 10% of the present range. The Auto option is not available
in DMM Digitize data acquisition mode.
4. Press Sense Settings > Sense, specify the strain measurement method as full and half bridge in bending arrange-
ments.
5. Press Gage Settings, and use the knob or the front panel arrow keys to specify various strain gage settings.
Softkey
Gage Factor
Excitation
Fix/ Ext
Excitation
Voltage
Keysight DAQ970A/DAQ973A User's Guide
Description
Gage factor is the ratio of the fractional change in resistance to the fractional change in length (strain)
along the axis of the gage. The larger the value, the more sensitive strain gage. Gage factor is a
dimensionless quantity. The typical value is approximately 2.
Strain bridge conversions require the voltage of the external bridge excitation. For this voltage, you
can dedicate a multiplexer channel to measure the excitation voltage, or can specify a known fixed
voltage value. Fixed (
Fix ) - The fixed value specified by the Excitation Voltage softkey will be used for
the strain conversion. External (
used for subsequent strain bridge measurements that specify an external excitation voltage source.
Note that the external DCV reference channel must be a lower-numbered channel than the strain
channel.
Use the knob or the front panel arrow keys to specify the fixed excitation voltage applied to the bridge
by an external voltage source. This value will be used to convert strain bridge measurements on the
selected channel.
Ext ) - DCV measurements on the enabled reference channel will be
3 Features and Functions
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