It has a nasty, noisy sproggy mess at around 50MHz (see attached photo). I've tried it with more than one power supply - current one is a new Mean Well SMPSU and I've tried adding big and small capacitors on its output to further smooth it.
The manual for the unit is linked below. Unfortunately it does not include a schematic or circuit description.
http://www.pcs-electronics.com/software ... 00p_en.pdf
I'm just wondering if anyone knows anything about the design and the likely fix? Maybe something needs extra decoupling somewhere?
Failing that - any suggestions for a good BPF? - noddy instructions to make one, or good one to buy? Maybe a tweaky capacitor on the output filter might work?
All ideas and thoughts greatfully received. Thanks for your time.