TEM cell - near field measurement

sas

We are using equipment from Tekbox since a couple of time - we use it in the developing process/phase for testing our hardware devices.

Used equipment for a current test:

TBOH01
https://www.tekbox.com/product/tboh01-5uh-lisn-cispr-25/

TBTC3
https://www.tekbox.com/product/open-tem-cells-emc-compliance-testing/

TBST-200/100/100
https://www.tekbox.com/product/tbst-shielded-tents/

Used EMCview-Version: V09.19 NSIS 32b

Used spectrum analyser: Rigol DSA832E

Now, we want to measure some stuff according CISPR25 radiated emission.
In EMCview I Ioad the EMC-project “TC_CISPR25_EN55025_Class5.prj “ to get the levels for the TEM cell (near field measurement), here my setup:

And an empty measurement (the DUT is OFF) brings me the following result (shield-tent closed):

Now my question: why the peak-detector shows values above the levels?
For me, AVG looks good and correct, but the result of PEAK is too high, or not?

In my point of view, I did the setup in the right way, but maybe I am wrong….

Many thanks for any answer/help respectively support.

robert

Hi Sas,
This could happen because the preamplifier is set differently in the corresponding segment files, for whatever reason. If you set the preamp to “on” for all segments in the TC_CISPR25_EN55025_PK.Seg file then it should work.

sas

Hi Robert,

this does the job, now it’s working 🙂

Many thanks for your urgent help!

Have a nice weekend
BR
Stefan