David wrote:
For what it is worth, my 5370B run very hot, which forced me to check my mains voltage * * * it was consistently high. * * * I managed to get the supply company to reduce the voltage by 5%.
Eliminating that small amount of extra dissipation won't get you anywhere near the safe heatsink temperature zone with a 5370. I tested one set for 120v with line voltages down to 90v (-25%), and the heatsinks were still way too hot for comfort (both for your hand touching them, and for peace of mind re: longevity).
It would be interesting to know how low the AC input can go on a 5370B before the regulators fail to regulate.
The HP spec is +5, -10%. That includes a safety margin. -10% is not the absolute minimum (where the supplies drop out of regulation). The one I tested down to 90v was still in regulation at that voltage, but it is possible the regulation might have been less effective at that voltage than designed due to lack of sufficient regulator headroom. I'd say you're most likely fine down to -20% or so, but test to make sure. And note that there may well be some unit-to-unit variance.
Best regards, Charles _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
