4.2 Viewing Power Measurements, and Changing the Measurement Configuration
56
Select the source to determine the fundamental cycle (between zero crossings) on which various calcula-
tions are to be based.
As a general usage, for each wiring, select the voltage of the measurement channel for the channel mea-
suring the alternating current, and 50 msDC for the channel measuring the direct current.
When measuring distorted alternating waveforms with a lot of noise, such as PWM waveforms, accurate
measurements can be achieved by suitably combining the settings in "Setting the Zero-Crossing Filter"
(p. 57).
Select from the following 11 items for each Wiring mode. Press to make the setting on the Setting
screen.
The selected synchronization source is displayed as [Sync] on the Measurement screen.
Use the [Ext] setting when performing pulse-based measurement during motor analysis or when measur-
ing electrical angle.
* Motor Testing is installed and CH B is set only for pulse input.
4.2.3 Selecting the Sync Source
U1 to U4 (Default setting), I1 to I4, DC 50 ms, DC 100 ms, Ext*
Sync Source Setting Procedure
• When measuring AC input with [DC 50 ms] and [DC 100 ms] settings, displayed val-
ues fluctuate and proper measurement is not possible. Select any of [U1] to [U4] or
[I1] to [I4].
• Voltage and current share the same sync source on each channel.
• [DC 50 ms] is the fastest calculation interval for DC measurements. However, if input
interference (50/60-Hz power line noise) causes measurement values to fluctuate,
select
[DC 100 ms].
• When U or I is selected as a sync source, amplitude should remain at least 30% f.s.
• Also when U or I is selected as a sync source, if a frequency is applied above 5 kHz
or below the minimum measurement frequency, the displayed frequency may differ
from the input frequency.
For the sync source, select an input with a fundamental frequency of 0.5 Hz to 5 kHz,
and specify the corresponding minimum measurement frequency.
• The measurement values may get unstable at the frequency around the lowest mea-
surable frequency, because the synchronization is unlocked.
Select with the F keys
Select
[Sync source] for
the channel to be
changed.
[All CH Set]
and [Next]:
See "2.2 Basic Operations" (p. 18)
Display the
[Input] page
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