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Hi again Dudley- you don't give much away do you!I recently purchased a Hung Chang OS615s and it came without it's internal battery. Can anybody tell me the spec for a new battery for the above please?
Thanks for the information Dudley- that is a great help.Sorry, yes it's an oscilloscope. Designed to work off 120v or 240v a.c., external d.c. supply 11-30v or the internal battery for which the charging voltage is 22.3v the size of the battery holder pictured is 11 x 9 cms approx. and the compartment is also pictured. also is pictured the back panel. I have found some figures which suggest June 1989. The scope is in full working order and I'm just one of these people who thinks if it should have a battery it would be nice to have it complete. I have tried uploading the jpeg files but it don't seem to work
Can you describe what batteries you are talking about?Yes it has a charging circuit so presumably protection as it has a charge indicator to tell when battery is being charged. the last time I purchased some of these batteries I could not get one end of the batt to solder, any suggestions would be gratefully received?
You are a mine of information Keep.Hung Chang, I believe was absorbed or became Protek and they died in 2012. https://www.testequipmentconnection.com/manufacturer/Protek
22.3V can be achieved, close enough, by six of Li Ion cells in series to give a nominal voltage of 6 * 3.6V = 21.6V.
spec
You are a mine of information Keep
I have tried uploading the jpeg files but it don't seem to work
Dudley said:the size of the battery holder pictured is 11 x 9 cms approx.
Not quite sure what you are saying there. For a simple charge/discharge regime with six Lithium Ion (LiIon) cells in series you need 4 * 6 =24V constant voltage with a current limit of 1 * C say (C is the the battery capacity, say 3.4 A/H). Any lower current limit would also be suitable.If I charge 6 li-ion cells Which I believe would be 22.2v with a constant 18v would that be ok do you think?