Apart from capacitor ESR checking, I use this meter for checking and
tracking battery ESRs. Can anyone give me a safe upper voltage level
opinion for not damaging the meter in this use? I have used it to check
2S Li-ion but could you get away with a 10S (42V) battery or 48V e-bike
battery for example? The meter is too useful to damage!
Or perhaps a standard capacitor in series would be a trick for
protection? Thanks C+

On 2023-08-03, Charlie+ <charlie@xxx.net> wrote:
> Apart from capacitor ESR checking, I use this meter for checking and
> tracking battery ESRs. Can anyone give me a safe upper voltage level
> opinion for not damaging the meter in this use? I have used it to check
> 2S Li-ion but could you get away with a 10S (42V) battery or 48V e-bike
> battery for example? The meter is too useful to damage!
> Or perhaps a standard capacitor in series would be a trick for
> protection? Thanks C+

Look at the voltage rating of C5, C6, C7 and the wattage rating of R23
subtract the supply voltage (5v) and there's your answer; and if you
want to upgrade the voltage rating, there's your shopping list.

http://bobparker.net.au/esr_meter/k7214.pdf

--
Jasen.
🇺🇦 Слава Україні

On 2023/08/03 2:15 a.m., Jasen Betts wrote:
> On 2023-08-03, Charlie+ <charlie@xxx.net> wrote:
>> Apart from capacitor ESR checking, I use this meter for checking and
>> tracking battery ESRs. Can anyone give me a safe upper voltage level
>> opinion for not damaging the meter in this use? I have used it to check
>> 2S Li-ion but could you get away with a 10S (42V) battery or 48V e-bike
>> battery for example? The meter is too useful to damage!
>> Or perhaps a standard capacitor in series would be a trick for
>> protection? Thanks C+
>
> Look at the voltage rating of C5, C6, C7 and the wattage rating of R23
> subtract the supply voltage (5v) and there's your answer; and if you
> want to upgrade the voltage rating, there's your shopping list.
>
> http://bobparker.net.au/esr_meter/k7214.pdf
>

Nice to see people picking up Bob's suggestions of using the ESR meter
to check batteries! Bob and I talked about that in the late 90s.

https://www.flippers.com/esrkthnt.html

The capacitors protecting the inputs are 50V or 63V rated as per the
schematics. Should be safe for 42 to 48VDC batteries.

John :-#)#
--
(Please post followups or tech inquiries to the USENET newsgroup)
John's Jukes Ltd.
#7 - 3979 Marine Way, Burnaby, BC, Canada V5J 5E3
(604)872-5757 (Pinballs, Jukes, Video Games)
www.flippers.com
"Old pinballers never die, they just flip out."

On Thu, 3 Aug 2023 09:15:55 -0000 (UTC), Jasen Betts
<usenet@revmaps.no-ip.org> wrote as underneath :

>On 2023-08-03, Charlie+ <charlie@xxx.net> wrote:
>> Apart from capacitor ESR checking, I use this meter for checking and
>> tracking battery ESRs. Can anyone give me a safe upper voltage level
>> opinion for not damaging the meter in this use? I have used it to check
>> 2S Li-ion but could you get away with a 10S (42V) battery or 48V e-bike
>> battery for example? The meter is too useful to damage!
>> Or perhaps a standard capacitor in series would be a trick for
>> protection? Thanks C+
>
>Look at the voltage rating of C5, C6, C7 and the wattage rating of R23
>subtract the supply voltage (5v) and there's your answer; and if you
>want to upgrade the voltage rating, there's your shopping list.
>
>http://bobparker.net.au/esr_meter/k7214.pdf

Thanks to you and J for replies, as I recall I just put together the kit
as supplied! I will double check those items for V and Wattage just in
case, thanks C+

On Thu, 3 Aug 2023 12:41:35 -0700, John Robertson <jrr@flippers.com>
wrote as underneath :

>On 2023/08/03 2:15 a.m., Jasen Betts wrote:
>> On 2023-08-03, Charlie+ <charlie@xxx.net> wrote:
>>> Apart from capacitor ESR checking, I use this meter for checking and
>>> tracking battery ESRs. Can anyone give me a safe upper voltage level
>>> opinion for not damaging the meter in this use? I have used it to check
>>> 2S Li-ion but could you get away with a 10S (42V) battery or 48V e-bike
>>> battery for example? The meter is too useful to damage!
>>> Or perhaps a standard capacitor in series would be a trick for
>>> protection? Thanks C+
>>
>> Look at the voltage rating of C5, C6, C7 and the wattage rating of R23
>> subtract the supply voltage (5v) and there's your answer; and if you
>> want to upgrade the voltage rating, there's your shopping list.
>>
>> http://bobparker.net.au/esr_meter/k7214.pdf
>>
>
>Nice to see people picking up Bob's suggestions of using the ESR meter
>to check batteries! Bob and I talked about that in the late 90s.
>
>https://www.flippers.com/esrkthnt.html
>
>The capacitors protecting the inputs are 50V or 63V rated as per the
>schematics. Should be safe for 42 to 48VDC batteries.
>
>John :-#)#

OK just a feedback update for interest, my meter is the Anatek version
of the Bob Parker kit built about 10 years ago and the input components
are as per the schematic, just checked for safety as up thread!
I tested my two 10S 36-42v e-bike batteries one about 7 years old and
the other 1 year old. Used the output terminals with the batteries ready
for use at about 80% charge, part of the ESR reads will be from the BMS
circuits and all the internal wiring.
Older battery : 30 Ohms (this one is still OK but near end of useful
life, down to about 1/4 of original milage on the clock)
Newer battery : 14 Ohms.
C+