CONFigure:CURRent:AC

From Keysight 34970A/34972A

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CONFigure:CURRent:AC
CONFigure:CURRent:DC

Syntax

CONFigure:CURRent:AC [{<range>|AUTO|MIN|MAX|DEF}[,{<resolution>|MIN|MAX|DEF}],] (@<scan_list>)

CONFigure:CURRent:DC [{<range>|AUTO|MIN|MAX|DEF}[,{<resolution>|MIN|MAX|DEF}],] (@<scan_list>)

Description

These commands configure the channels for AC or DC current measurements but do not initiate the scan.

The CONFigure command does not place the instrument in the "wait-for-trigger" state. Use the INITiate or READ? command in conjunction with CONFigure to place the instrument in the "wait-for-trigger" state.

Used With:

34901A 20 Channel Multiplexer (2/4-wire) Module (channels 21 and 22 only)

Parameters

Name Type Range of Values Default Value

<range> Numeric
Expected value in amps (ranges shown below).

10 mA (MIN)
100 mA
1 A (MAX)
AUTO

<resolution> Numeric Desired resolution in amps. Fixed at 6½ digits

<scan_list> Scan 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.
This is a required parameter.

Name	Type	Range of Values	Default Value
<range>	Numeric	Expected value in amps (ranges shown below). 10 mA (MIN) 100 mA 1 A (MAX)	AUTO
<resolution>	Numeric	Desired resolution in amps.	Fixed at 6½ digits
<scan_list>	Scan 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.	This is a required parameter.

Remarks

When you specify a range of channels with this command, any channels that are invalid will be ignored (no error will be generated) but the first and last channel in the range must be valid for the selected function.
You can allow the instrument to automatically select the measurement range using autoranging or you can select a fixed range using manual ranging. Autoranging is convenient because the instrument decides which range to use for each measurement based on the input signal. For fastest scanning operation, use manual ranging on each measurement (some additional time is required for autoranging since the instrument has to make a range selection).
If you select autoranging (by specifying "AUTO" or "DEF"), an error will be generated if you specify a discrete value for the <resolution> parameter. When autoranging is combined with a discrete resolution, the instrument cannot accurately resolve the integration time (especially if the input signal is continuously changing). If your application requires autoranging, be sure to specify "AUTO" for the <resolution> parameter or omit the parameter from the command.
Autorange thresholds:
Down range at: <10% of range
Up range at: >120% of range

Because this command resets all measurement parameters on the specified channels to their default values, be sure to send the CONFigure command before setting any other measurement parameters.
If the input signal is greater than can be measured on the selected range (manual ranging), the instrument gives an overload indication: "±OVLD" from the front panel or "±9.9E+37" from the remote interface.
For AC measurements, the resolution is fixed at 6½ digits. The only way to control the reading rate for AC measurements is by changing the channel delay or by setting the AC filter to the highest frequency limit. The <resolution> parameter only affects the number of digits shown on the front panel.
The *RST command will clear the scan list and set all measurement parameters to their factory settings. The Instrument Preset (SYSTem:PRESet command) will not clear the scan list; however, this command will clear reading memory and all stored statistical data.

Examples

These commands show the CONFigure:CURRent:AC command. In each case, you could substitute the CONFigure:CURRent:DC command and the example would be valid.

The following program segment configures the instrument for AC current measurements on channel 21 in slot 100. The READ? command places the instrument in the "wait-for-trigger" state, scans the channel once, and then sends the reading to reading memory and the instrument's output buffer. The default range (autorange) and resolution (fixed at 6½ digits) are used for the measurement.

CONF:CURR:AC (@121)
ROUT:SCAN (@121)
READ?

Typical Response: +8.54530000E-02

The following program segment configures the instrument for an AC current measurement on channels 21 and 22 in slot 100. The INITiate command places the instrument in the "wait-for-trigger" state, scans the channels once, and stores the readings in memory. The FETCh? command transfers the readings from reading memory to the instrument's output buffer. The 1 A range is selected with 200 mA resolution.

CONF:CURR:AC 1,0.2,(@121,122)
ROUT:SCAN (@121,122)
INIT
FETC?

Typical Response: +4.27150000E-02,+1.32130000E-03

CONFigure:CURRent:AC