On 11/21/2015 6:13 AM, Bob Camp wrote:
Hi
The key issue is that there has been a lot learned about charging batteries
since the 5065A was designed. Just as other parts of the 5065 can be improved
with some work, so can the battery charger. Given that NiCad’s aren’t cheap,
it’s worth noting that the circuit could be worked on *before* somebody buys
a bunch of batteries to re-cell one.
Moving a bit further off topic and back to our original conversation when you
re-did
yours (2 years ago?) - you don’t get a lot of standby time even with the full
load of
NiCads in there.
Bob, I stopped writing dates on the chart thing inside the pull down
cover in August 2004 since the numbers had not changed significantly
since 2002 (and still haven't) which in fact must have been when I did
the battery. Time flies... A bit more than my guess of 5 years! It
got a check recently when we had an outage that lasted for a good twenty
minutes and the green light stayed lit. -hp- spec is for more than ten
minutes.
And incidentally the schematic shows the battery as 25.2 Volts which
might indicate 21 cells, although I'm sure it would work with 20 and
maybe there have been early versions that did have 20; mine is late, the
last but one serial prefix.
It's certainly possible that the circuit might be improved but it does
seem to perform as advertised as is. For extended periods than there is
always the DC input as has been pointed out. I suspect this option was
more for moving the thing from one lab to another adjacent rather that
flying clock trips or mountain climbing :^)
Dan
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