L3Harris NARDA PMM ER8000 User Manual page 39

4.1.4 Guidance on a
preliminary
Measuring
Procedure
4.1.5 Remarks and Hints
for Measuring
A step-by-step example of a conducted test is the following:
1. Connect the EUT to the front panel socket and the mains network to the
rear plug trough a proper isolation transformer. Leave the EUT switched
off;
2. Switch ON the PMM ER8000 and wait for it to be ready;
3. Run the PMM Emission Suite software;
4. Enter the Sweep Mode by clicking the related tab;
5. Set the Display Dynamics to 120 dB;
6. Choose a Reference Level between 100 and 125 dBµV;
7. Click right key onto the Scan Table and choose the B band;
8. The Minimum Attenuation should be 10 dB;
9. Set the Pulse Limiter in the Front End box on the right of the screen, to
protect the input against voltage spikes;
10. The Detector should be Peak;
11. Select the desired phase/line of the LISN in the Ancillary column of the
Scan Table after having chosen L2 ER in the Ancillary box on the right
of the screen;
12. With the EUT switched OFF, click the Execute soft button and wait until
the first scan has been finished;
13. Carry out an overview of the whole spectrum and check the by
executing a pre-measurement with peak detector that the ambient RF
disturbances are at least 20 dB below the desired emission levels;
14. If the ambient noises are low enough continue to the next step,
otherwise take all the necessary steps to reduce the ambient
disturbances (e.g. go to a shielded room, etc.);
15. Switch ON the EUT and then Redo Sweep again and wait until the scan
has been finished;
16. Adjust the Dynamic Range and the Reference Level for the most
convenient visualization;
17. If the results are satisfactory select the cursor Marker (or the Multi
Marker) and fond the Highest Peak(s) and then either click Analyzer or
Manual to enter respectively in Spectrum Mode or in Manual Mode and
deeply investigate the highest signals;
18. If the results of the scan need to be compared to a defined level, select
a Limit, if appropriate, and then measure again.
To avoid errors caused by ambient interference, measurements should be
carried out inside a properly certified anechoic chamber or open site
(OATS). Different sites, like basements or other shielded rooms with low
ambient interferences, are often sufficient for a precertification evaluation
and for debug purposes.
Applications 4-5