Keysight DAQ970A Guia Del Usuario página 126

3 Features and Functions
4. 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 200 PLC provides the best noise rejection and
resolution, but the slowest measurements.
Softkey
Integrate NPLC
Time
Advanced settings
In DMM Digitize data acquisition mode, only the Auto Zero setting will be available in the Advanced settings.
Press Advanced to configure the advanced settings for the measurement.
Softkey
Auto Zero
Off/ On
OffstCmp
Off/ On
Low Power
Off/ On
Delay
Auto/ Time
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Description
Sets the integration time as 0.001, 0.002, 0.006, 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.
Directly sets the integration time in seconds.
Description
Auto Zero provides the most accurate measurements, but requires additional measurement time to perform
the zero measurement. With auto zero enabled (
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 accuracy. With auto zero
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 auto zero setting for 4-wire measurements).
Offset compensation removes the effects of small DC voltages in the circuit being measured. The technique
involves taking the difference between two resistance measurements, one with the current source set to the
normal value, and one with the current source set to a lower value.
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 current
sourced for the standard resistance measurements. The approximate current sourced for each
measurement range is shown at the bottom of the resistance range softkeys, for example: (~ 1 mA).
Selects whether the delay between channels in the scan list will be automatically or manually selected. By
selecting Auto , instrument will automatically determine the channel delay based on measurement function,
range, integration time, and AC filter setting. By selecting
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.
On ), the instrument internally measures the offset following
Time , the specified delay (time in seconds) is
Keysight DAQ970A/DAQ973A User's Guide