CONFigure:VOLTage:AC
CONFigure:VOLTage:AC
CONFigure:VOLTage:DC
Syntax
CONFigure:VOLTage:AC [{<range>|AUTO|MIN|MAX|DEF}[,{<resolution>|MIN|MAX|DEF}],] (@<scan_list>)
CONFigure:VOLTage:DC [{<range>|AUTO|MIN|MAX|DEF}[,{<resolution>|MIN|MAX|DEF}],] (@<scan_list>)
Description
These commands configure the channels in the <scan_list> for AC or DC voltage 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
- 34902A 16 Channel Multiplexer (2/4-wire) Module
- 34908A 40 Channel Single-Ended Multiplexer Module
Parameters
Name Type Range of Values Default Value <range> Numeric Expected value in volts
AUTO <resolution> Numeric Desired resolution in volts. 0.000003 x Range (1 PLC) <scan_list> Scan 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.
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:VOLTage:AC command. In each case, you could substitute the CONFigure:VOLTage:DC command and the example would be valid.
The following program segment configures the instrument for AC voltage measurements on channel 04 in slot 300. 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 6
CONF:VOLT:AC (@304)
ROUT:SCAN (@304)
READ?
Typical Response: +1.86850000E-03
The following program segment configures the instrument for AC voltage measurements on channels 03 and 08 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 V range is selected.
CONF:VOLT:AC 1,(@103,108)
ROUT:SCAN (@103,108)
INIT
FETC?
Typical Response: +4.27150000E-03,+1.32130000E-03
The following program segment configures channel 10 on the module in slot 300 for an AC voltage measurement. The READ? command places the instrument in the "wait-for-trigger" state, initiates a trigger, and then sends the reading to reading memory and the instrument's output buffer. The default range (autorange) and resolution (fixed at 6
CONF:VOLT:AC (@310)
READ?
Typical Response: +1.26360000E-02