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HP 8753A/B/C non-volative memory

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SteveReeves

SteveReeves

Electrical
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Aug 26, 2003
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Does anyone know about how long the non-volative memory of the HP 8753A/B/C should last? This is the memory portion where the user may store instrument states. The manual says > 72 hrs (I think it's much longer actually). The memory is maintained by a 0.22 Farad cap on the microprocessor board - no battery. I was curious because we're seeing several come in for calibration and when turned on they clear their memory registers at power up.
 
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At room temperature, it lasts about a week, as I recall.
 
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