Keysight Technologies 3458A Guide D'utilisation page 104

3 Configuring for Measurements
component (the power-on/PRESET NORM value is 2 MHz). For example, suppose
the input signal has a frequency range of 750 Hz to 2 kHz; you should send:
OUTPUT 722;"ACBAND 750,2000"
Refer to the
(and reading rate specifications for analog AC measurements) based on the
frequency components of the input signal.
For synchronous AC or AC + DC voltage measurements, the bandwidth
NOTE
parameters are used by the multimeter to calculate time-out values and
sampling parameters. For frequency or period measurements with autorange
enabled, the bandwidth parameters are used to determine the amount of time
needed for autoranging. For these measurements, it is very important that the
specified bandwidth (particularly the specified low frequency) corresponds to
the frequency content of the input signal.
Setting the integration time
Integration time is the period of time that the A/D converter measures the input
signal. For analog AC measurements, the integration time determines the
maximum digits of resolution and, along with the specified bandwidth affects the
measurement speed. (Integration time also has a minor affect on analog AC
measurement accuracy). Analog AC measurements are defined as AC or AC+DC
voltage measurements made using the analog conversion method (SETACV ANA
command) only, and AC or AC+DC current measurements. With longer integration
times, the measurement resolution and accuracy increases, but measurement
speed decreases.
The integration time has no effect on frequency or period measurements. For
NOTE
sampled AC voltage measurements (SET ACV SYNC or SET ACV RNDM) the A/D
converter's integration time is selected automatically and the multimeter
achieves the specified resolution
section) by varying the number of samples taken.
For analog AC measurements, you can specify integration time in terms of power
line cycles (PLCs) using the NPLC command. (You can also use the APER
command to specify integration time although it is primarily intended for DC
104
"Appendix A: Specifications" on page 409 for accuracy specifications
(Specifying resolution
Keysight 3458A User's Guide
is discussed in the next