Hioki 3286-20, Instruction Manual, Page: 48 / 78

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Chapter 2 Measurement Procedure
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I/ key
U/ key
1st order 2nd order - - - - 20th order
20th order 19th order - - - - 1st order
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 instrument
performs FFT operations only when the fundamental
wave is covered within the 45 to 65 Hz range. The
instrument does not perform FFT operations outside
this range.