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SIGLENT
SDS2000X User Manual 195
Efficiency
Efficiency analysis tests the overall efficiency of the power supply by measuring the output
power and the input power. A 4-channel model SDS2000X oscilloscope is necessary to
apply the efficiency analysis.
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 Efficiency and
press down the knob to confirm.
Figure 132: Efficiency ANALYSIS Function Menu
5. Connect the probes to the device-under-test and to the oscilloscope as well.
a. Select the proper attenuation ratio for the probes.
b. Connect D+ of the input voltage probe to the live wire of the AC input.
c. Connect D- of the input voltage probe to the neutral wire of the AC input.
d. Connect the input current probe to the live wire of the AC input with the direction of
the arrow pointing towards the current flow.
e. Connect D+ of the output voltage probe to the input path of the load.
f. Connect D- of the output voltage probe to the return path of the load.
g. Connect the output current probe to the input path of the load with the direction of
the arrow pointing towards to the current flow.
h. Connect the voltage and current probes to the desired oscilloscope channels.
6. Press the Signal softkey to enter the SIGNAL menu.
Figure 133: Efficiency SIGNAL Menu
7. Press the Input V, Input I, Output V and Output I softkeys and then turn the
universal knob to select the channels.
8. Make sure the proper probe attenuation factors are set in the oscilloscope for the
voltage and current probes.
9. Press the Duration softkey, and then turn the universal knob to set the time duration
to capture signals. This sets the time/div of the oscilloscope.
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.
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