wtm@neoucom.UUCP (Bill Mayhew) (06/22/88)
Hi, Does anyone know the range of tolerable input voltage ranges for the Unix PC. Due to the heat, demand and a minor disaster at our substation, we are currently liming along at 99.7 volts, rather than the customary 119.5 here at impulse's abode. There doesn't seem to be any nameplate rating on the back of the machine or in accompanying manuals. I looked through "AT&T Unix PC Owner's Manual" and its loose inserts as well as "AT&T Unix PC Getting Started". Several placed do mention that that Unix PC does need to be plugged in. Good enough, but there don't seem to be any references as to what constitues an acceptible power source. I first noticed the power bug when my UPS switched into standby mode continuously, eventhough the house lights stayed on. Apparently, going below 100 v RMS is what triggers the UPS. I moved impulse over to a regular wall outlet at 99.7 volts. Impulse seems to be working alright for now. If this brown-out keeps up, I guess it is time to scrape up a ferro-resonant transformer to get the voltage back to 120. Only one device -- a JVC video color processor -- seems to be bothered by running at only 99.7 volts. It has a very nasty hum bar in the picture now. Amazingly, the monitors and TV don't seem to be showing noticable shrinkage in the picture. --Bill impulse!wtm@neoucom.UUCP