Measuring conducted emission limits in line with IEC/EN 61000-3-2

Today’s electronic devices often draw non-sinusoidal, irregular current where harmonic current is fed back into the universal supply system. Monitoring this current is both crucial and mandatory for CE compliant devices. The R&S®NPA701 compliance tester seamlessly and efficiently monitors this current.

Your task

Modern electronic devices use switched‑mode power supplies that can generate strong harmonic current which is then injected back into the mains supply network. IEC/EN 61000‑3‑2 defines harmonic current emission limits for four equipment classes. Harmonic current must be analyzed for precisely defined periods and remain within specified limits based on the equipment class and cycle time.

The required accuracy up to the 40th harmonic makes automated testing essential.

Rohde & Schwarz solution

The R&S®NPA701 compliance tester seamlessly acquires and processes signals in real time for accelerated measurements. Precise measurements ensure standard compliance, even for critical designs.

The optional R&S®NPA-Zx mains adapter makes plugging the DUT into the R&S®NPA701 simple and safe. The cables that come with the adapter are connected to sockets on the front of the instrument. Country-specific adapters can be used for connection in different countries.

The setup wizard eliminates guesswork

The R&S®NPA701 setup wizard guides users through measurements and configures the instrument parameters to minimize measurement errors and quickly reveal results.The measurement process is fully automatic. No prior knowledge of the standards is necessary.

All environmental variables (supply voltage and mains quality) are constantly monitored and displayed during measurements. Deviations are color-coded.

Select the IEC/EN 61000‑3‑2 standard
Step 1
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The measurement steps

1. Select the IEC/EN 61000‑3‑2 standard in the wizard.

Set the correct mains voltage and mains frequency
Step 2
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2. Set the correct mains voltage and mains frequency (manually, or automatically by selected region) and set the expected power consumption for the DUT.

Select the right device class
Step 3
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3. Select the right device class.

Set the crest factor and maximum current
Step 4
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4. Set the crest factor and maximum current (RMS).

set the current consumption pattern
Step 5
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5. If known, set the current consumption pattern (static, cyclic or variable) to speed up the measurement.

Connect the DUT
Step 6
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6. Connect the DUT as instructed in the wizard and switch the DUT to the desired operating mode.

Results, including min. and max. values
Step 7
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7. The results, including min. and max. values, are clearly displayed during and after the measurement.

Test report
Test report
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Test report

When the measurement is completed, the results can be saved to a USB flash drive. An interactive HTML form is created that can be filled in with user data to tailor the test report to your specific needs.


The R&S®NPA701 compliance tester from Rohde & Schwarz enables accurate and easy testing of harmonic current emissions in electronic devices, automates the testing process in line with IEC/EN 61000‑3‑2 standards, ensures compliance and has a user-friendly setup wizard. The precise test results can be also saved on a USB flash drive.