[SENSe:]VOLTage:DC:APERture
[SENSe:]VOLTage:DC:APERture
Syntax
[SENSe:]VOLTage:DC:APERture {<time>|MIN|MAX}[,(@<ch_list>)]
[SENSe:]VOLTage:DC:APERture? [{(@<ch_list>)|MIN|MAX}]
Description
This command enables the aperture mode and sets the integration time in seconds (called aperture time) for DC voltage measurements on the specified channels.
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You should use this command only when you want precise control of the integration time of the internal DMM. Otherwise, specifying integration time using NPLC (see [SENSe:]VOLTage[:DC]:NPLC command) executes faster and offers better power line noise rejection characteristics for values of NPLC greater than 1. |
Used With:
- 34901A 20 Channel Multiplexer (2/4-wire) Module
- 34902A 16 Channel Multiplexer (2/4-wire) Module
- 34908A 40 Channel Single-Ended Multiplexer Module
Parameters
Name Type Range of Values Default Value <time> Numeric Desired aperture time in seconds between 300 µs and 1 second, with 4 µs resolution. MIN = 300 µs, MAX = 1 second Aperture disabled. <ch_list> Channel List One or more channels, as shown:
(@310) - channel 10 on the module in slot 300.
(@305:310) - channels 05 through 10 on the module in slot 300.
(@202:207,209,302:308) - channels 02 through 07 and 09 on the module in slot 200 and channels 02 through 08 on the module in slot 300.
If you omit the optional <ch_list> parameter, this command applies to the currently defined scan list.
Remarks
- For the <seconds> parameter, you can substitute MIN or MAX for a numeric value. MIN selects the smallest value accepted, which gives the lowest resolution; MAX selects the largest value accepted, which gives the highest resolution.
- Only the integral number of power line cycles (1, 2, 10, 20, 100, or 200 PLCs) provide normal mode (line frequency noise) rejection.
- The CONFigure, MEASure?, [SENSe:]VOLTage[:DC]:NPLC, and [SENSe:]VOLTage[:DC]:RESolution commands disable the aperture time mode (these commands select an integration time in number of power line cycles).
- The aperture mode is disabled after a Factory Reset (*RST command). An Instrument Preset (SYSTem:PRESet command) or Card Reset (SYSTem:CPON command) does not change the setting.
Return Format
The query returns the aperture time in the form "+1.00000000E-01" for each channel specified. Multiple responses are separated by commas.
Examples
The following command enables the aperture mode and sets the aperture time to 300 ms on channels 03 and 13 in slot 100.
VOLT:DC:APER 300E-03,(@103,113)
The following query returns the aperture time selected on channels 03 and 13 in slot 100.
VOLT:DC:APER? (@103,113) VOLT:DC:APER:ENAB? !Verify that aperture mode is enabled ("1")
Typical Response: +3.00000000E-01,+3.00000000E-01
See Also