Keysight DAQ970A User Guide

4. Press Sense Settings > Sense, specify the strain measurement method as quarter bridge arrange-
ment.
5. Press Gage Settings, and use the knob or the front panel arrow keys to specify various strain gage set-
tings.
Gage Factor - 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 (Ext) - DCV measurements on the enabled reference channel will be used for sub-
sequent 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.
Excitation Voltage - 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 meas-
urements on the selected channel.
6. Press Integrate Settings softkey to select whether the measurement integration time will be specified
in terms of Number of Power Line Cycles (NPLC) or directly in seconds (Time). Only 1, 2, 10, 20, 100,
and 200 PLC provide normal mode (line frequency noise) rejection. Selecting 100 PLC provides the best
noise rejection and resolution, but the slowest measurements..
NPLC - Sets the integration time as 0.02, 0.06, 0.2, 1, 2, 10, 20, 100, and 200 Power Line Cycles
(PLC). Only 1 PLC and longer times provide normal mode (line frequency noise) rejection. Selecting 100
or 200 PLC provides the best noise rejection and resolution.
Time - Directly sets the integration time in seconds.
Advanced settings
Keysight DAQ970A User's Guide 105
[Channel] Menu Overview

Keysight DAQ970A Specifications

General

Scan Rate	Up to 450 channels/sec
Connectivity	USB, LAN, GPIB (optional)
Display	4.3-inch color LCD
Operating Temperature	0 °C to 50 °C
Number of slots	3 slots
Measurement Types	DCV, ACV, DCI, ACI, 2-wire resistance, 4-wire resistance, frequency, temperature, capacitance
Voltmeter	6.5 digit
Resolution	22 bits
Memory	Non-volatile memory