[volt-nuts] 7061 On Board Clock and Battery

[J. L. Trantham]

Fabio,

Thanks for the link to the pictures.  I never seem to remember eevblog when
it comes to looking for stuff.

Your pictures show that your Earthy board is completely different from mine
in the area of 'B101'.  You have no place for B101.  Also, your Floating
board is different in that you have the 'CA' firmware and 28 pin EPROM's.  I
wonder if anyone has modified my 'version' of the Floating board to use 28
pin EPROM's and if there would be any utility to doing this.

I did not get a message directly from you (that I recognized at least).
I'll try to send you one directly to make sure we can 'establish
communications'.

Joe

-----Original Message-----
From: volt-nuts-bounces at febo.com [mailto:volt-nuts-bounces at febo.com] On
Behalf Of Fabio Eboli
Sent: Monday, June 25, 2012 5:14 AM
To: Discussion of precise voltage measurement
Subject: Re: [volt-nuts] 7061 On Board Clock and Battery


Here are some pics of the mine, only one battery:
http://www.eevblog.com/forum/product-reviews-photos-and-discussion/solartron
-7061-help-and-come-photos/msg93650/#msg93650

As for the manual I did try to contact you directly,
did you read the message?

Fabio.

"J. L. Trantham" <jltran at att.net> ha scritto:

> My 7061 has a single battery installed, B501, a 3.6 V Ni-MH 
> Rechargeable 3 pin battery.  My 7081 has two batteries installed, the 
> same 3.6 V Ni-MH Rechargeable battery and a ½ AA Lithium Battery that 
> serves as the onboard clock backup battery.  It is connected with its 
> negative pin to a 47K resistor to ground and its positive pin to a 
> diode that feeds a connection that is also fed by another diode from 
> the main power supply.  The common connection of these diodes feed the 
> clock chip.
>
>
>
> On my 7061 there is a location, B101 that appears to be for the same 
> type ½ AA Lithium Battery.  The + pin connects to a diode, in a manner 
> similar to that described above, and the – pin connects to a ‘space’ 
> for a resistor, R117, with the other end of the resistor going to 
> ground.  Both the battery, B101, and the resistor, R117, are missing.
>
>
>
> My questions are:
>
>
>
> 1.	Does anyone have a 7061 with this battery and resistor installed?
> 2.	If so, what is the value of the resistor, R117, and what type is the
> battery?
>
>
>
> It seems that this would be an easy addition to get a live clock 
> without the need to restart the clock each time the meter is turned 
> on.  Or, perhaps there is a reason why this in not a good idea.
>
>
>
> Thanks in advance.
>
>
>
> Joe
>
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