HP Forum Archive 20

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HP41CX power consumption Message #1 Posted by Egan Ford on 11 Apr 2011, 2:15 p.m. Can someone please tell me power consumption of a 41CX in use (flying goose)? Thanks.

Re: HP41CX power consumption Message #2 Posted by Eric Smith on 11 Apr 2011, 2:37 p.m., in response to message #1 by Egan Ford I've measured a fullnut at about 72 mW (12 mA at 6V). There's probably a moderate amount of variation between units. I'd expect a halfnut to draw less.

Re: HP41CX power consumption Message #3 Posted by Juergen Keller on 11 Apr 2011, 5:24 p.m., in response to message #1 by Egan Ford Is the goose flying forwards or backwards? Sorry, couldn't resist ;-)

Re: HP41CX power consumption Message #4 Posted by Eric Smith on 11 Apr 2011, 5:53 p.m., in response to message #3 by Juergen Keller I've modified mine to have a flying grouse.

Re: HP41CX power consumption Message #5 Posted by Patrice on 11 Apr 2011, 7:50 p.m., in response to message #3 by Juergen Keller It is POSSIBLE with some synthetic programming :)

Re: HP41CX power consumption Message #6 Posted by exschr on 12 Apr 2011, 3:22 p.m., in response to message #1 by Egan Ford From what I could find out there for the flying bird: From service manual, finseth.com and from 41CL (aka systemyde.com/hp41) 50mA 12.5mA 7.9mA For IDLE and for OFF: 1mA 1mA 4.2mA 0.05mA 0.02mA 0.11mA I made once some investigations, I can't remember the details, but the current consumption was in the order of the numbers from service manual (slightly below). But as already mentioned: your mileage might vary

Re: HP41CX power consumption Message #7 Posted by Garth Wilson on 12 Apr 2011, 11:30 p.m., in response to message #1 by Egan Ford My owner's manual, P.381-382, says for program running it's 5-20mA; for ON but idle it's .5 to 2.0mA, and for OFF it's .01 to .05mA. This is a 41cx Halfnut. I used to go a couple of years on a set of batteries, then got a double extended memory module and that took the battery life down to about six months.

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