[volt-nuts] Leave it on?

[Joseph Gray]

Marv,

Thanks for your thoughts. I'll leave it on.

Joe Gray
W5JG



On Sat, Aug 10, 2013 at 7:17 AM, Marv @ Home <marvin.gozum at comcast.net>wrote:

> If its likely still in cal after being in storage for ? years, it likely
> doesn't matter.
>
> In general, its best never to turn off high accuracy devices once they are
> in a stable state.  Aging of references is more reliable [ i.e., reduced
> uncertainty] when the device is kept under power. Its a bigger issue with
> 7.5 digit DMM and more.
>
> The EDC calibrators were made to be portable, however in the specs the
> shortest term accuracy rating, ~ 1 hr of 5ppm suggests to me the unit
> performs best if left powered on, if used as a reference.  If may not hold
> at 5ppm to a year, but it likely may be better than its 30ppm or so, worse
> case.  With the unit on, the quiescent operating temp of the device plus
> stable lab temperatures eliminates thermal shock as one factor to
> destabilize your reference's setting.
>
>
>
> At 01:27 AM 8/9/2013, Joseph Gray wrote:
>
>> Since the VS330 is designed to be a portable voltage standard, is it
>> better
>> to leave it on all the time or not? The manuals for other models don't
>> say,
>> but they do talk about the short power up time to achieve rated accuracy.
>> So far, I have left it on.
>>
>>
> ______________________________**_________________
> volt-nuts mailing list -- volt-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/**
> mailman/listinfo/volt-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts>
> and follow the instructions there.
>
>