[time-nuts] Sulzer 5A & 5P PSU/battery question

paul swed paulswedb at gmail.com
Fri Nov 2 01:27:56 UTC 2012


Thanks for the pointer I have a pretty dirty pdf from some place the links
very clean.
Paul
WB8TSL

On Thu, Nov 1, 2012 at 7:24 PM, Magnus Danielson <magnus at rubidium.dyndns.org
> wrote:

> On 11/01/2012 10:27 PM, Attila Kinali wrote:
>
>> On Thu, 01 Nov 2012 21:51:21 +0100
>> Magnus Danielson<magnus at rubidium.**dyndns.org<magnus at rubidium.dyndns.org>>
>>  wrote:
>>
>>
>>  Yesterday I picked up a Sulzer 5A + 5P without batteries. It is supposed
>>> to have 21 D-cell NiCd batteries, but today those are not easy to come
>>> by,
>>>
>>
>> NiCd Batteries still exist, but have been mostly replaced by LiIon/LiPoly
>> packs these days. Though, you should be still able to find NiMH batteries,
>> which are in most cases a drop in replacement for NiCd, if you keep
>> two things in mind:
>>
>> 1) The maximum charge current of the battery should never be exceeded.
>> NiCd were much more forgiving in that regard.
>>
>> 2) When charging finished, then the batteries need to be disconnected
>> unless you do a trickle charge. At least this was a problem with the
>> early NiMH, it might have changed in the past 15 years. Check datasheet.
>>
>> 3) Charge end detection for fast NiCd chargers (>1C) does not work with
>> NiMH as the negative Voltage slope of NiMH is not as pronounced as with
>> NiCd. If you have such a charger, you need to replace it with a modern
>> one.
>>
>
> Thanks for the input guys!
>
> The manual for them both is at
> http://www.ko4bb.com/Manuals/**09)_Misc_Test_Equipment/**
> Sulzer_Laboratories_Model_5A_**Frequency_Standard.pdf<http://www.ko4bb.com/Manuals/09)_Misc_Test_Equipment/Sulzer_Laboratories_Model_5A_Frequency_Standard.pdf>
>
> The 5P manual describes the charging operation, it has a 50 mA charge
> current, a fast charging feature.
>
> By the look of things, the way that the design is done, it should survive
> without the battery-pack installed.
>
>
> Cheers,
> Magnus
>
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