App.6-1
IM CW240E
Appendix
App
Appendix 6 Sampling Method
The sampling method can be set on the basic setting 2/2 screen.
Refer to Section 6.3.2, Setting up the Sampling Method.
The PLL synchronization method and the fixed clock can be selected.
It is ordinarily set to PLL synchronization.
●
PLL Synchronization
The operation is done by performing PLL synchronization with the zero cross
signal of frequency measurement input.
●
Fixed Clock
Sampling of 128 times the fixed clock is performed.
50 Hz or 60 Hz can be selected for the fixed clock.
Select 50 Hz or 60 Hz according to the measurement line frequency.
●
PLL Unlock
"PLL unlock" indicates the state in which the frequency measurement input is at
or below the specified value when PLL synchronization has been set.
In this case, the mode switches to the fixed clock method, the measurement is
performed, and the
mark is displayed on the screen.
Sampling is done at the frequency set with the fixed clock.
Even in the case of PLL synchronization, confirm that the frequency setting
matches the measurement line.