[volt-nuts] 7061 On Board Clock and Battery
Fred Schneider
pa4tim at gmail.com
Mon Jun 25 06:12:48 UTC 2012
http://www.pa4tim.nl/?p=2456 here is a picture of the inside of my 7061. No second battery.
Fred PA4TIM
Op 25 jun. 2012 om 03:23 heeft "J. L. Trantham" <jltran at att.net> het volgende geschreven:
> 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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