Hi Partzman,
thanks for your comment, i do agree that an internal PS current meter is not ideal to use as an indication for a pulsed load, especially as the below picture shows on the right side
near the yellow arrow, very probably the shunt used for this internal current meter, intended to measure DC loads.
The coil like shape of this shunt will have some inductance and with 600kHz pulsed load will have some reactance and thus will deviate from its intended DC operation spec.
However, there were different current measurements methods used, but they were classified as undetermined because the results could not be matched with what the PS internal current meter showed or
deemed unrealistic because they supposed to show more current, the PS could deliver. (5A @ 24V = 120W, mind you it is a 60V PS) etc.
Methods used were: using DMM's to measure voltage across a csr and directly as a current meter, using a "kill o watt" meter at the PS 240V side and a watt meter like shown here:
https://nl.aliexpress.com/item/32274797082.html which states DC Watt meter.
It might be that some methods did show considerable current still flowing while the internal PS meter showed near zero current, but they were put aside as unreliable / undetermined which could be true due to the fact the DMM's are not designed for 600kHz operation.
But the fact of the matter is that I too (and other replicators) can show this decrease of input current to near zero (see my above video’s) both on the used PS current meter, as via the scope (current) probes as well with a "kill o watt" meter, which makes this decrease real at resonance, but i and other replicators problem is that the bulbs go out too at that current decrease resonance point.
Could it be a so-called sub resonance inside this specific PS current meter circuit, showing minimum current there while full current passes through to the device?
Regards Itsu