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Chapter 2 Measurement Procedure
MODE
key
THD-R
THD-F Content
NOTE
5. Switch between the total harmonic distortion ratio
(THD-R, THD-F) and harmonic percentage from
one to another, as needed, by pressing the
MODE
key.
Be sure to clamp one conductor only. Measurement
is not possible for single phase or three phases when
two or three conductors are respectively clamped at
the same time.
Automatic frequency detection (AUTO), 50 Hz
fixed, or 60 Hz fixed can be selected. In cases
where the input fluctuates significantly, the
indicated value will stabilize when 50 Hz or 60 Hz
fixed is selected. For how to select, see the setup of
measurement line frequency in SETUP mode. (For
details, see 2.9, "SETUP Function.")
For automatic frequency detection, the unit
performs FFT operations only when the fundamental
wave is covered within the 45 to 65 Hz range. The
unit does not perform FFT operations outside this
range.
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