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SIGLENT
174 SDS2000X User Manual
Power Quality
The Power Quality analysis shows the quality of the AC input line.
Some AC current may flow back into and back out of the load without delivering energy.
This current, called reactive or harmonic current, gives rise to an “apparent” power which
is larger than the actual power consume. Power quality is determined by the following
measurements RMS voltage, RMS current, Apparent Power, Real Power, etc.
1. Press the Utility button on the front panel to enter the UTILITY function menu.
2. Press the Next Page softkey to enter the second page of the UTILITY function menu.
3. Press the Power Analyze softkey to enter the ANALYSIS function menu.
4. Press the Analysis softkey, and then turn the universal knob to select Power Quality
and press down the knob to confirm.
Figure 100: ANALYSIS Function Menu
5. Connect the appropriate probes to the device to be tested and to the oscilloscope
a. Select the proper attenuation ratio for the probes.
b. Connect D+ of the voltage probe to the live wire of the AC input.
c. Connect D- of the voltage probe to the neutral wire of the AC input.
d. Connect the current probe to the live wire of the AC input with the direction of the
arrow pointing towards the current flow.
e. Connect the voltage and current probes to the desired oscilloscope channels.
6. Press the Signal softkey to enter the SIGNAL menu.
Figure 101: Power Quality SIGNAL Menu
7. Press the Voltage and Current softkeys and then turn the universal knob to select the
channels..
8. Make sure the proper probe attenuation factors are set in the oscilloscope channels.
9. Press the Cycles softkey, and then turn the universal knob in order to set the number
of cycles on the screen’s display.
10. Press the Auto Setup softkey to automatically set the appropriate time/div and volt/div
for the measurement.
11. Return to the ANALYSIS function menu.
12. Press the Type softkey, and then turn the universal knob to select the type of
measurement:
V
rms
: Root mean square of the AC line voltage.
I
rms
: Root mean square of the AC line current.
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