[SENSe:]FREQuency:RANGe:LOWer
[SENSe:]FREQuency:RANGe:LOWer
Syntax
[SENSe:]FREQuency:RANGe:LOWer {<frequency>|MIN|MAX}[,(@<ch_list>)]
[SENSe:]FREQuency:RANGe:LOWer? [{(@<ch_list>)|MIN|MAX}]
Description
The instrument uses three different timeout ranges for frequency measurements. The instrument selects the slow (3 Hz), medium (20 Hz), or fast (200 Hz) measurement timeout based on the input frequency that you specify with this command for the selected 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 <frequency> Numeric An integer from 3 to 300,000. This is a required parameter. <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
- Applies to frequency measurements only.
- For the <frequency> parameter, specify the lowest frequency expected in the input signal on the specified channels. The instrument selects the appropriate measurement timeout based on the frequency you specify. Attempts to measure frequencies below the specified limit may falsely return a value of 0.
- The CONFigure and MEASure? commands automatically select the 20 Hz (medium) timeout.
- The instrument selects the medium timeout (20 Hz) after a Factory Reset (*RST command). An Instrument Preset (SYSTem:PRESet command) or Card Reset (SYSTem:CPON command) does not change the setting.
| Input Frequency | Timeout |
|---|---|
| 3 Hz to 300 kHz (Slow) | 1 second |
| 20 Hz to 300 kHz (Medium) | 100 ms |
| 200 Hz to 300 kHz (Fast) | 10 ms |
Return Format
The query returns 3.0000000 (slow), 2.0000000E+1 (medium), or 2.0000000E+2 (fast).
Examples
For each of the commands shown below, you could use the node name PERiod in place of the FREQ node name.
The following command selects the slow filter (3 Hz).
FREQ:RANG:LOW 3
The following query returns the timeout setting.
FREQ:RANG:LOW?
Typical Response: 3.0000000