[SENSe:]CURRent:AC:RESolution
[SENSe:]CURRent:AC:RESolution
[SENSe:]CURRent:DC:RESolution
Syntax
[SENSe:]CURRent:AC:RESolution {<resolution>|MIN|MAX}[,(@<ch_list>)]
[SENSe:]CURRent:AC:RESolution? [{(@<ch_list>)|MIN|MAX}]
[SENSe:]CURRent:DC:RESolution {<resolution>|MIN|MAX}[,(@<ch_list>)]
[SENSe:]CURRent:DC:RESolution? [{(@<ch_list>)|MIN|MAX}]
Description
This command selects the measurement resolution for current measurements on the specified channels. The instrument clears all readings from memory when a new scan is initiated, when any measurement parameters are changed (CONFigure and SENSe commands), and when the triggering configuration is changed (TRIGger commands).If you omit the optional <ch_list> parameter, this command applies to the currently defined scan list.
Used With:
- 34901A 20 Channel Multiplexer (2/4-wire) Module (channels 21 and 22 only)
Parameters
Name Type Range of Values Default Value <resolution> Numeric Desired resolution in amps. 0.000003 x Range (1 PLC) <ch_list> Channel List One or more channels, as shown:
(@321) - channel 21 on the module in slot 300.
(@221:222) - channels 21 through 22 on the module in slot 200.
(@121:122,222,321:322) - channels 21 and 22 on the module in slot 100, channel 22 on the module in slot 200, and channels 21-22 on the module in slot 300.
Note that the channels must be of the form s21 and s22, where s is the first digit of the slot number.
If you omit the optional <ch_list> parameter, this command applies to the currently defined scan list.
Remarks
- For the <resolution> parameter, you can substitute MIN or MAX for a numeric value. MIN selects the smallest value accepted, which gives the highest resolution; MAX selects the largest value accepted, which gives the least resolution.
- The instrument will dispatch a settings conflict error if you issue this command when[SENSe:]CURRent:AC:RANGe:AUTO (AC resolution) or [SENSe:]CURRent:DC:RANGe:AUTO (DC resolution) is ON for one or more of the specified channels.
-
Setting the resolution also sets the integration time for the measurement. The following table shows the relationship between integration time, measurement resolution, number of digits, and number of bits.
Integration Time Resolution Digits Bits 0.02 PLC <0.0001 x Range 4½ Digits 15 0.2 PLC <0.00001 x Range 5½ Digits 18 1 PLC <0.000003 x Range 5½ Digits 20 2 PLC <0.0000022 x Range 6½ Digits 21 10 PLC <0.000001 x Range 6½ Digits 24 20 PLC <0.0000008 x Range 6½ Digits 25 100 PLC <0.0000003 x Range 6½ Digits 26 200 PLC <0.00000022 x Range 6½ Digits 26
- You can also set the integration time by specifying an aperture time (see [SENSe:]CURRent[:DC]:APERture command). However, note that specifying integration time using NPLCs executes faster and offers better noise rejection characteristics for values of NPLC greater than 1.
- The CONFigure, MEASure?, [SENSe:]CURRent[:DC]:NPLC, and [SENSe:]CURRent[:DC]:RESolution commands automatically disable the aperture mode (these commands select an integration time in NPLCs).
- The instrument sets the resolution to 1 PLC 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 resolution in the form "+1.00000000E-04" for each channel specified. Multiple responses are separated by commas.
Examples
The following command sets the measurement resolution to 0.01 mA on channels 21 and 22 in slot 100.
CURR:DC:RES 0.00001,(@121,122)
The following query returns the resolution selected on channels 21 and 22 in slot 100.
CURR:DC:RES? (@121,122)
CURR:DC:APER:ENAB? !Verify that aperture mode is disabled ("0")
Typical Response: +1.00000000E-04,+1.00000000E-04
See Also