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User Manual EC1000S
California Instruments 97
4.3 Measurement of Harmonic Current
Switching power sources are widely used in both consumer and industrial electrical products. The
capacitor input type rectifier circuits that are used with such input power lines have disadvantages such
as significant distortion of input current and a large amount of harmonic current. When a large amount
of this current flows in the power source line, the equipment may experience operation faults, such as
voltage distortion, which can cause the transformer to overheat, possibly resulting in a hazardous
accident.
The EC1000S includes a function for measuring harmonic current. This measurement does not comply
with the IEC standards.
This measurement can be performed only in AC-INT mode and when the fundamental wave (panel
frequency setting) is either 50 Hz or 60 Hz. Absolute values of harmonic current in RMS and their
percentages to the fundamental are displayed up to the 40th harmonics (2 kHz at 50 Hz fundamental).
When harmonic current measurement is selected, RMS value, average DC, and peak value
measurements are not performed. If RMS value, average DC, or peak value has been set, harmonic
current measurement is not performed.
a) Changing to harmonic measurement window
To view the harmonic measurement window,
select “MEASURE” in the MISC menu
.

Operation steps
1. Press the
or
key to move the cursor to the icon, then press the
E NT E R
key.
ENTER CANCEL
Cursor

The MISC menu is displayed.
2.
Press the
or
key to move the c
ursor to “MEASURE”, then press the
E NT E R
key.

The selection box is displayed.