GW Instek APS-1102A, User Manual, Page: 92 / 285

APS-1102A User Manual
APS-1102A 4-20
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 APS-1102A includes a function for measuring harmonic current. This measurement does not
conform to the IEC or other 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).
The measurement value of harmonic current is reference value.
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
EN TER
key.
ENTER CANCEL
Cursor

The MISC menu is displayed.
2.
Press the
or
key to move the cursor to “MEASURE”, then press the
EN TER
key.

The selection box is displayed.
ENTER CANCEL
Selection box