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3.2 Selecting the Rectifier Type
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RMS MEAN FILT
RECTIFIER
RECTIFIER
▼
NOTE
3.2 Selecting the Rectifier Type
(1) For voltage measurement this unit has three rectifier circuits. Before
measurement, select the following type.
① RMS Measure true RMS value
② MEAN Measure average rectifier effective value converted for
voltage, true RMS value for current
③ MEAN+FILTER Measure average rectifier effective value converted for
voltage with a 500Hz low-pass filter (L.P.F.), true RMS
value for current.
(2) The rectifier type selected displays on rectifier display.
(3) Pressing the
RECTIFIER
key changes the rectifier type.
Select suitable rectifier type repeating these operation.
･ Both "average rectifier effective value converted (MEAN)" and "real
effective value (RMS)" indicate correct effective value. However, only "real
effective value" indicates correct value for the input which include distorted
wave.
･ When "average rectifier effective value converted with 500Hz low-pass filter
(L.P.F.) (MEAN+FILTER)" is set, a 500Hz filter is applied during
measurement. With this filter, inverter carrier elements are eliminated for a
closer measurement of the fundamental frequency. However, the power
computation circuit uses input waveform as is, so the measurement value
does not differ when RMS, MEAN, or MEAN+FILTER is chosen.
Moreover, accuracy is not guaranteed for measurement with MEAN+FILTER
of high frequency input over 60Hz.
･ During integrating (with RUN lit or flashed), the rectifier type cannot be
changed ("Err.012"). Before changing the rectifier type, press the
RESET
key to reset the integration (RUN goes off).
･ During holding the displays (with HOLD lit or flashed), the rectifier type
cannot be changed ("Err.016"). Before changing the rectifier type, press the
HOLD
key to release the hold state (HOLD goes off).
･ When the rectifier type is changed, read the measurement value after the
condition of internal circuit is stable (for 5 seconds or more).
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