Configuration:Measurement Options:Powerline Frequency Property

Short Name: Powerline Frequency

Property of niDMM

Specifies the powerline frequency. The NI 4060 and NI 4050 use this value to select an aperture time to reject powerline noise by selecting the appropriate internal sample clock and filter. The NI 4065 and NI 4070/4071/4072 use this value to select timebases for setting the Aperture Time property in powerline cycles.

After configuring powerline frequency, set the Aperture Time Units property to PLCs. When setting the Aperture Time property, select the number of PLCs for the powerline frequency. For example, if powerline frequency = 50 Hz (or 20 ms) and aperture time in PLCs = 5, then aperture time in seconds = 20 ms * 5 PLCs = 100 ms. Similarly, if powerline frequency = 60 Hz (or 16.667 ms) and aperture time in PLCs = 6, then aperture time in seconds = 16.667 ms * 6 PLCs = 100 ms.

Note  For 400 Hz powerline frequency, use the 50 Hz setting.

50 Hz (5.000000E+1)	Specifies the powerline frequency as 50 Hz.
60 Hz (6.000000E+1)	Specifies the powerline frequency as 60 Hz.

Remarks

The following table lists the characteristics of this property.

Datatype
Permissions	Read/Write
High-level VIs	niDMM Configure Powerline Frequency
Resettable	No