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The following command selects the 1 A range with 6½ digits of resolution
on channel 2041 (current measurements are allowed only on channels 41
through 44 on the 34921A).
MEAS:CURR:AC? 1,1E-6,(@2041)
You can also select the resolution using the
the following command specifies a 2- wire ohms measurement with 100
resolution on channel 1003.
SENS:RES:RES 100,(@1003)
Custom A/D Integration Time
Integration time is the period of time the internal DMM's analog- to- digital
(A/D) converter samples the input signal for a measurement. Integration
time affects the measurement resolution (for better resolution, use a longer
integration time) and measurement speed (for faster measurements, use a
shorter integration time).
• Integration time is specified in number of power line cycles (PLCs).
• Only integral number of power line cycles (1, 2, 10, 20, 100, or 200
• You can also specify integration time directly in seconds (this is called
• The only way to control the reading rate for ac measurements is by
• The specified integration time is used for all measurements on the
34980A User's Guide
Select from 0.02, 0.2, 1, 2, 10, 20, 100, or 200 power line cycles.
The default is 1 PLC.
PLCs) provide normal mode (line frequency noise) rejection.
aperture time). Select a value between 300 µs and 1 second, with
4 µs resolution.
changing the channel delay (see
setting the ac filter to the highest frequency limit (see
Frequency Filter"
on page 36).
selected channel. If you have applied Mx+B scaling or have assigned
alarms to the selected channel, those measurements are also made
using the specified integration time. Measurements taken during the
Monitor function also use the specified integration time.
Features and Functions
commands. For example,
SENSe
"Channel Delay"
on page 53) or by
2
of
"AC Low
19
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