5. Press Use as ref to enable (On) or disable (Off) the currently selected channel to be used as the ref-
erence channel for subsequent thermocouple measurements that specify an external reference source.
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
Press Advanced to configure the advanced settings for the measurement.
Auto Zero - Autozero provides the most accurate measurements, but requires additional measurement
time to perform the zero measurement. With autozero enabled (On), the instrument internally measures
the offset following each measurement. It then subtracts that measurement from the preceding reading.
This prevents offset voltages present on the instrument’s input circuitry from affecting measurement accur-
acy. With autozero disabled (Off), the instrument measures the offset once and subtracts the offset from all
subsequent measurements. The instrument takes a new offset measurement each time you change the
function, range, or integration time. (There is no autozero setting for 4-wire measurements).
Low Power - Selects the low-power resistance measurement. This sources less current resulting in lower
power dissipation, and less self-heating, in the resistance under test. Typically, this is about 1/10th the cur-
rent sourced for the standard resistance measurements. The approximate current sourced for each meas-
urement range is shown at the bottom of the resistance range softkeys, for example: (~ 1 mA).
Delay - Selects whether the delay between channels in the scan list will be automatically or manually selec-
ted. By selecting Auto, instrument will automatically determine the channel delay based on measurement
function, range, integration time, and AC filter setting. By selecting Time, the specified delay (time in
seconds) is inserted between the relay closure and the actual measurement on each channel, in addition to
any delay that will implicitly occur due to relay settling time.
2-wire and 4-wire RTD
1.
Connect an RTD to the module's screw terminals.
2-wire RTD:
Keysight DAQ970A User's Guide 93
[Channel] Menu Overview
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