SYSTem:LFRequency?

SYSTem:LFRequency?

Syntax | Description | Parameters | Remarks | Return Format | Example

Syntax

SYSTem:LFRequency?

Description

This command returns the current power-line reference frequency used by the instrument. When you apply power to the instrument, the instrument automatically detects the power-line frequency (50 Hz, 60 Hz, or 400 Hz) and uses this value to determine the integration time used.

Remarks

• If the detected power line frequency is 400 Hz, the 50 Hz reference value is actually used (a subharmonic of 400 Hz).
• The instrument uses this information in determining integration time in NPLC commands.
• The reference frequency setting is stored in volatile memory and will be lost when power is turned off. The instrument automatically measures the power-line frequency (50 Hz, 60 Hz, or 400 Hz) at power-on.  

Return Format

The command returns "50" (for 50 Hz or 400 Hz) or "60" indicating the present reference frequency setting.

Example

The following query returns the power line frequency.

SYST:LFR?

Typical Response: +60

See Also

SYSTem Subsystem Introduction