[SENSe:]FUNCtion
Syntax
[SENSe:]FUNCtion "<function>" [, (@<ch_list>)]
[SENSe:]FUNCtion? [(@<ch_list>)]
Description
This command selects the measurement function on the specified channels (all function-related measurement attributes are remembered). If you omit the optional <ch_list> parameter, this command applies to the internal DMM, independent of any channels or a scan list.
The following table shows which measurement functions are supported by each of the multiplexer modules.
|
|
Voltage |
Current |
Freq/ |
Ohms |
Ohms |
Thermocouple |
RTD |
RTD |
Thermistor |
|
34921A |
Yes |
Yes1 |
Yes |
Yes |
Yes |
Yes2 |
Yes |
Yes |
Yes |
|
34922A |
Yes |
No |
Yes |
Yes |
Yes |
Yes3 |
Yes |
Yes |
Yes |
|
34923A |
Yes |
No |
Yes |
Yes5 |
Yes5 |
Yes3,4 |
Yes5 |
Yes5 |
Yes5 |
|
34923A |
Yes |
No |
Yes |
Yes5 |
No |
Yes3,4 |
Yes5 |
No |
Yes5 |
|
34924A |
Yes |
No |
Yes |
Yes5 |
Yes5 |
Yes3,4 |
Yes5 |
Yes5 |
Yes5 |
|
34925A |
Yes |
No |
Yes |
Yes6 |
Yes6 |
Yes3 |
No |
Yes6 |
No |
|
34925A |
Yes |
No |
Yes |
Yes6 |
No |
Yes3 |
No |
No |
No |
|
1
Direct current measurements are allowed on channels
41 through 44 only (for all other channels, external shunts are required).
|
|||||||||
Parameters
|
Name |
Type |
Range of Values |
Default Value |
|
<function> |
Discrete |
Desired function enclosed in quotes: CURRent:AC |
DC Volts |
|
<ch_list> |
Numeric |
One or more channels in the form (@sccc). |
If <ch_list> is omitted, this command applies to the internal DMM. |
Remarks
If you omit the optional <ch_list> parameter, the configuration applies to the internal DMM, independent of any channels or a scan list (any existing scan list is not redefined). An error is generated if the internal DMM is not installed or is disabled.
For 4-wire resistance measurements ("FRESistance"), the instrument automatically pairs channel n in Bank 1 with channel n+20 in Bank 2 (34921A, 34923A, 34925A) or n+35 (34922A, 34924A) to provide the source and sense connections. For example, make the source connections to the HI and LO terminals on channel 2 in Bank 1 and the sense connections to the HI and LO terminals on channel 22 (or 37) in Bank 2. Specify the paired channel in Bank 1 (source) as the <ch_list> channel (channels in Bank 2 are not allowed in the <ch_list>).
If you change the measurement function on a channel, all measurement attributes of the previous function (range, resolution, etc.) are remembered. If you return to the function, all previously-defined measurement attributes will be restored. However, when storing instrument states (see *SAV command), only the measurement attributes of the currently-selected function are stored.
The instrument sets the function to dc volts 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 command returns an ASCII string enclosed in double quotes for each channel specified. Multiple responses are separated by commas. The short form of the function name is always returned (e.g., "CURR:AC", "FREQ", etc.).
Examples
The following commands select the ac voltage function on channels 3 and 13 in slot 1 (double or single quotes are allowed).
FUNC "VOLT:AC", (@1003,1013) or FUNC 'VOLT:AC', (@1003,1013)
The following query returns the function selected on channels 3 and 13 in slot 1 (the quotes are also returned).
FUNC? (@1003,1013)
Typical Response: "VOLT:AC","VOLT:AC"