[Test-Equipment] Selective Voltmeter W&G SPM-15

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J. Forster wrote:

>Does it have a sick memory backup battery? Just a guess. I don't know the
>instrument.
>-John
>  
>

John,
          thanks for your answer. The problem is that, not having the 
Service Manual, I don't
even know if there is a backup battery...
I would tend to say that there is no battery, as without mains voltage 
(even if switched off)
it looses all the frequency and sensitivity settings, but maybe the 
battery is used for the
calibration only... it looks like I will have to open it, but, having 
opened an SPM-6 in the
past, I know already that it is a nightmare to service such a piece of 
equipment...
Still open to suggestions, thanks.

Alberto,  I2PHD