Hioki 3166 - PLL Synchronization

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1.4 PLL Synchronization
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CAUTIO
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・The fundamental frequency ranges that can be measured are 45 to 66 Hz
and 360 to 440 Hz. Measurement is not possible outside of these ranges.
・Frequency-controlled lines, such as the secondary line of an inverter, cannot
be measured.
・The displayed value may be unstable due to frequency fluctuations on the
line being measured or due to momentary loss of power.
・If PLL synchronization is lost, the 3166 enters the "PLL unlocked" state, and
switches to the fixed clock for measurement. Note that even in this case, the
frequency measurement is displayed in a range from 40 to 500 Hz. The
values obtained during integrated measurement and demand measurement
are measured with the fixed clock in the PLL unlocked state. Once the PLL
synchronization stabilizes and the lock is regained, the power meter recovers
automatically.
* The PLL synchronization is warning displayed during the PLL unlocked.
・A measured value may be displayed when the base frequency of the line
being measured is less than 45 Hz, but that measured value is invalid.
・If the line being measured is carrying direct current, accurate measurement
is not possible.
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.4 PLL Synchronization
This power meter is capable of accurate measurement because it uses the PLL
synchronization method, in which digital sampling is conducted in
synchronization with the fundamental frequency of the line that is being
measured.
Keep the following points in mind in order to assure the proper use of this
feature.