CALibration:LFRequency
Syntax
CALibration:LFRequency <line_frequency>
CALibration:LFRequency?
Description
This command sets the power-line reference frequency used by the internal DMM's analog-to-digital converter. Normally, when you apply power to the instrument, the internal DMM automatically measures the power-line frequency (50 Hz, 60 Hz, or 400 Hz) and uses this measurement to determine the integration time used.
Parameters
|
Name |
Type |
Range of Values |
Default Value |
|
<line_frequency> |
Discrete |
{50|60|400} |
This is a required parameter |
Remarks
The internal DMM is an optional assembly for the Agilent 34980A. An error is generated if the internal DMM is disabled (see INSTrument:DMM[:STATe] command) or not installed in the mainframe.
If you set the reference frequency to 400 Hz, the 50 Hz reference value is actually used (a subharmonic of 400 Hz).
The internal DMM multiplies the period of the reference frequency by the specified number of power line cycles ([SENSe:]<function>:NPLC commands) to determine the actual integration time.
The reference frequency setting is stored in volatile memory and will be reset to the measured power-line frequency when power is turned off.
Return Format
The command returns "50" (for 50 Hz or 400 Hz) or "60" indicating the present reference frequency setting.
Examples
The following command sets the reference frequency setting to 50 Hz.
CAL:LFR 50
The following command returns the reference frequency setting.
CAL:LFR?
Typical Response: +60