if you deep discharge led acid batteries -- which are not made special
for deep discharge -- you will have to replace them quite often, on the
other hand Ni-Fe batteries you could short out, overcharge they are
undisrtuktable that is the reason why they are not produced any more in
the US, they do not fit into the American business-model, but phone
companies, railway and aviation still using them, you could still find
old electrical forklifts with Ni-Fe battery made by Edison Batteries in
the sixties in the past century the batteries are still fine. Tudor -- a
led-acid battery producer -- purchased Edison Batteries and closed down
the formidable competitor
73
KL6UHN
Alex
On 9/15/2016 2:26 PM, Mark Spencer wrote:
Hi I've run my HP105B (with the old style oscillator) from AC power via a
consumer grade UPS, 24 Vdc from a lead acid battery bank and briefly from the
internal battery pack with out any notable changes in performance (that being
said I can't measure phase noise so this observation may or may not be of use.)
I'm not to fussed over the internal Nicad pack and rely on an external battery
bank in case I loose AC power for an extended time period.
During a two day outage my HP105B and FTS1050 ran nicely from a 100 AH battery
bank but the batteries needed to be replaced shortly afterwards.
Sent from my iPhone
On Sep 15, 2016, at 11:13 AM, Jeremy Nichols <[email protected]> wrote:
Your point is well made. My question is: what happens to the quality of the
output sine wave if I use anything other than a true sine-wave (i.e.,
expensive) UPS? Most of them these days produce a semi-sine wave (aka modified
square wave) that may or may not play well with the 105B. Anyone have
experience?
A external battery and appropriate chargers and cabling does sound like another good
alternative. Harder to move around but I don't (yet) have such a need, only that the 105B
stay "on" regardless of power failures.
Jeremy
On 9/15/2016 10:15 AM, Bob Camp wrote:
Hi
A bigger question becomes:
Do batteries inside equipment make much sense anymore?
These days, a UPS is often a standard part of a rack in an outage prone area.
Powering
the “whatever” instrument off of the same UPS as the rest of the stuff is one
obvious
answer.
The other answer is an even older approach. Use a battery bank that is external
to all
the gear in the rack and tend it independently of each box in the rack. That
way you have
a few very large cells to worry about rather than a whole bunch scattered
about. Things like
lead acid that are impractical in a piece of gear are more of an option in an
independent
battery box. A single charger / line supply makes it easier to invest in
something with real
smarts in it. The advent of dirt cheap isolated switchers makes the conversion
to instrument
voltages a lot easier than it once was. Pick a common voltage like 12, 24, or
48V and run with it.
My answer to the frequency standard battery pack question has become “don’t do
it”. It makes
them a *lot* lighter weight !!!
Bob
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