[SENSe:]FREQuency:APERture
[SENSe:]FREQuency:APERture
[SENSe:]PERiod:APERture
Syntax
[SENSe:]FREQuency:APERture {<seconds>|MIN|MAX}[,(@<ch_list>)]
[SENSe:]FREQuency:APERture? [{(@<ch_list>)|MIN|MAX}]
[SENSe:]PERiod:APERture {<seconds>|MIN|MAX}[,(@<ch_list>)]
[SENSe:]PERiod:APERture? [{(@<ch_list>)|MIN|MAX}]
Description
These commands select the aperture time (also called gate time) for frequency and period measurements on the specified channels.
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 <seconds> Discrete Desired gate time in seconds:
10 ms (4½ digits, MIN)
100 ms (5½ digits)
1 second (6½ digits, MAX)
100 ms <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.
- Because frequency and period are related functions, changing a measurement parameter for one function will also change the corresponding parameter for the other function.
- The instrument sets the aperture time to 100 ms 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 sets the gate time to 10 ms on channels 03 and 13 in slot 100.
You can substitute the node name PERiod where the node name FREQ appears below.
FREQ:APER 10E-03,(@103,113)
The following query returns the gate time selected on channels 03 and 13 in slot 100.
FREQ:APER? (@103,113)
Typical Response: +1.00000000E-02,+1.00000000E-02
See Also