UNI-T UT-181a – what am I doing wrong? (BIG bandwidth on AC Volts range ?)

[skander36]

...  If Gossen or UNI-T felt they had their problems solved and wanted me to repeat the test, I would have no problems doing it.  ...

It seem that UNI-T has tried to improve the PCB layout on UT181A . Photos from my unit (2020) and from the unit tested(2016) . Maybe is an attempt to address the problem you found.

[joeqsmith]

The areas you are pointing to are for the high current measurement.   I don't keep any metrics for the current.  All of the transient testing is performed between the common and voltage inputs.     Normally if I do anything with current, I will connect them to a bench supply with a few other meters in series.  Sometimes I will run the open fuse test that the IEC standards call out but I use a much lower power supply than what is called for.   

[skander36]

Ok.

[rsjsouza]

Even still, if they did a PCB review to acommodate this change, hopefully they took your video in consideration and modified other sections as well. Without both meters to compare, we can only speculate.

[joeqsmith]

If UNI-T contacted me and said they had made the meter more robust,  I wouldn't be apposed to running another as long as they were willing to stand by their product like Brymen has done.   The same offer would go out to Gossen.   If they really feel they have improved their meter, send it and I will repeat the tests.   I don't hold any malice towards any of these brands and these two meter in particular would both be worth the effort in having another look.