Keysight Technologies 3458A Guide D'utilisation page 159

Making Measurements 4
Integration time and resolution
DC, ohms, and analog AC measurements: The specified integration time and/or
resolution have a major effect on the reading rate for DC voltage; DC current:
2-wire or 4-wire ohms; AC or AC+DC current: and AC or AC+DC voltage (using the
SETACV ANA method only). The longer the integration time (or the greater the
resolution), the slower the reading rate. The specifications in Appendix A show
selected reading rates for each of these measurements based on integration time.
Sampled AC voltage measurements: For AC or AC+DC voltage measurements
using SETACV SYNC or SETACV RNDM, the integration time is fixed and cannot
be changed. For these measurements, the specified resolution has a major effect
on the reading rate. The specifications in Appendix A show selected reading rates
for sampled AC measurements based on the specified resolution.
Frequency or period measurements: The integration time does not affect
frequency or period measurements. For these measurements, the specified
resolution (which also selects gate time) has a major effect on the reading rate.
The specifications in Appendix A show reading rates for frequency and period
measurements based on the specified resolution.
Triggering setup
To ensure the fastest triggering configuration, set the trigger arm, trigger, and
sample events to AUTO, You can also use the TIMER sample event (or the SWEEP
command). Assuming you do not generate the TRIGGER TOO FAST error, the
reading rate is the reciprocal of the TIMER or SWEEP interval.
Delay time
Under normal operation, the multimeter automatically determines a delay time
(default delay) based on the present measurement function, range, resolution,
and for AC measurements, the AC bandwidth setting. This delay time is actually
the settling time inserted before the first reading, which ensures accurate
readings. The default delay has a large affect on the reading rate for analog AC
measurements and a minimal affect on the reading rate for sampled AC voltage or
DC measurements. For analog AC measurements, you can achieve a faster
reading rate by specifying a shorter delay than the default value. However, the
resulting settling time may not produce accurate measurements.
Keysight 3458A User's Guide 159