[volt-nuts] 7061 On Board Clock and Battery

[J. L. Trantham]

Fabio,

I uploaded the EPROM contents from my meter to Didier's site as well.  The
Floating board I have has 'AA' version firmware while yours is 'CA'.  Mine
uses TMS2516 chips that are 24 pin and I think yours are 2764 28 pin chips.

I'll investigate the statistics function after I make sure it is 'in range'
as far as the calibration goes.

I don't understand 'SP1 and SP2 on floating board are both open circuit'.
To what does this refer?

Thanks.

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 10:54 AM
To: Discussion of precise voltage measurement
Subject: Re: [volt-nuts] 7061 On Board Clock and Battery

Interesting, these roms are mine's:
http://www.ko4bb.com/Manuals/04)_ROM_Images_and_Drivers/Solartron_7061_ROMs.
zip

I have also a problem with statistics,
seem that the standard deviation calculation is
wrong:
http://www.febo.com/pipermail/volt-nuts/2012-April/001793.html
If you have time to test yours for this I would be grateful.

Another thing is that on mine SP1 and SP2 on floating board are both
open circuit.

Fabio.

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

> 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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