GW Instek APS-1102 User Manual - Manual (Page 83)

4.3 Measurement of Harmonic Current
APS-1102 Programmable AC/DC Power Source 4-19
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-1102 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
ENTER
key.
ENTER CANCEL
Cursor
 The MISC menu is displayed.
2. Press the
or key to move the cursor to “MEASURE”, then press the
ENTER
key.
 The selection box is displayed.
ENTER CANCEL
Selection box