Quote:
Originally Posted by mike sloan
I own the M5400-PM. I have observed that if all my equipment (attached to the M5400-PM) is turned off, the output voltage will drop to 114-115V. When I turn on the equipment...the output voltage will display 123V-125V. The input voltage stays steady at 125 volts. What is happening here? Is this normal?  |
I got mine today; and I have similar observation. When connected equipments are off or in standby, Vout reads 116 V or 117 V while Vin reads 123 V. I have noticed that most of the time, Vin = Vout atleast for the 123 to 126 V range of Vin when connected equipments are ON. It looks to me (after reading their training slides from their website) that M5400-PM has an auto-transformer with three tappings providing output in the range of 100 V to 130 V in steps of 6V. Their PRO equivalent model has steps of 2.5V (and uses a triac), that is, more precise control on output.
Now, for the second part of your question, even if input voltage is steady, connected equipment(s) can draw different currents causing drops in potential difference; and regulation will kick in only when the sag is significant enough to cause tap switching at the autotransformer (so until this happens, Vout will read less than Vin). I may be wrong - but this is how I read/interpret their literature.
I think the term "voltage regulation" they use for 5400-PM model that has increments between each tap of as large as 6 V, is slightly misleading (at least, not a good regulation I think). "Enhanced Voltage Monitoring" could perhaps be a better description. Their previous model (5400-EX) had, what they called, voltage monitoring.