User`s manual

VOLT:AC:RANG? !Query multimeter to return the present
range.
enter statement !Enter value into computer.
VOLTage:APERture
[SENSe:]VOLTage:APERture <time> sets the aperture (integration time) in
seconds. Values are rounded up to the nearest aperture time shown in the following
table.
Parameters
Parameter Name Parameter Type Range of Values Default Units
<time>
numeric
10 µs | 100 µs | 2.5 ms |
16.7 ms | 20 ms | 267 ms |
320 ms | MIN | MAX
seconds
Comments
•
MIN
sets the aperture time to 10 µs. MAX sets the aperture time to 320 ms.
• The fastest aperture time available when autoranging is 100 ms. In order to specify an
aperture time of 10 ms, you must select a fixed range.
• Setting the aperture time also sets the integration time in power line cycles (PLCs)
and the resolution. For example, an aperture time of 16.7 ms (60 Hz line frequency)
sets an integration time of 1 PLC. The corresponding resolution depends on the
function and range you select.
• The VOLT:APER command overrides the results of previously executed
VOLTage:NPLC and VOLTage:RESolution commands
(the last command executed has priority).
• The greater the aperture time, the greater the normal mode rejection (and the
lower the reading rate).
• For a 50 Hz line frequency, only the 20 ms and 320 ms settings provide normal mode
rejection of power line related noise. For a 60 Hz line frequency, only the 16.7 ms
and 267 ms settings provide normal mode rejection of power line related noise.
• *RST Condition: 16.7 ms (60 Hz) or 20 ms (50 Hz)
Example Setting the Aperture Time
VOLT:APER 2.67E-01 !Aperture time is 267 ms.
VOLTage:APERture?
[SENSe:]VOLTage:APERture? [MIN | MAX] returns one of the following numbers
to the output buffer:
The present aperture time in seconds if
MIN or MAX is not specified.
The minimum aperture time available (10 µs) if
MIN is specified.
The maximum aperture time available (320 ms) if
MAX is specified.
171 Command Reference Chapter 5