[time-nuts] HP-105B Battery Replacement?

Mark Spencer mark at alignedsolutions.com
Thu Sep 15 17:26:23 EDT 2016

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 <jn6wfo at gmail.com> 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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