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?
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
Li-Ion requires special charging circuitry. You can substitute Ni-MH for Ni-Cd without problems. I have done this for cordless phones. NiCd's are getting scarce. Lithium didn't likely exist back then.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.
Yep.You are a mine of information Keep
You may be new and attachment uploading may be disabled for a day or so. Unknown what the criteria is.I have tried uploading the jpeg files but it don't seem to work
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?