Channel Delay - Keysight Technologies DAQ970A Service Manual

– Allow for appropriate source settling by ensuring that the "U" annunciator
– For 2-wire ohms gain measurements, remove the test leads resistance by

Channel delay

The Open/Close characteristics of the physical relays in the DAQM901A
multiplexer module require delay time for the input test signals to settle before
valid and accurate measurements can be triggered by the internal DMM.
Depending on the length of the input test cables, set the channel delay time for
the instrument's respective measurement functions and ranges:
Measurement function
[a] The additional delay times for varying input ranges are needed for the instrument's test current source to stabilize
Keysight DAQ970A/DAQ973A Service Guide
disappears after enabling the output or by ensuring bit 12 (SETTLED) of the
calibrator's Instrument Status Register (
doing a Math NULL measurement with the leads shorted at Fluke Calibrator's
0 Ω (short).
DC voltage
DC current
AC voltage
AC current
[a]
4-wire ohms
2-wire ohms
Frequency
Capacitance
for test leads > 1 meter in length during ohms measurement, especially as the range increases, the test current
source decreases, which is particularly sensitive to environmental changes.
ISR?
Input range
≤100 V
>100 V
All
All
All
≤100 W
≤1 kW
≤10 kW
≤100 kW
≤1 MW
≥10 MW
All
All
Calibration Procedures
) is set to 1.
Input test cable length
≤1 meter
Auto
Auto
Auto
Auto
Auto
Auto
Auto
2
>1 meter
0.5 s
1 s
Auto
Auto
Auto
0.5 s
1 s
2 s
3 s
5 s
7 s
Auto
1 s
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