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Protect your DS ESR or LOPT kit! (Bob Parker)

Discussion in 'Electronic Repair' started by John Robertson, Mar 9, 2006.

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  1. I've just finished testing a device that protects the two kits up to
    350VDC @ 200MA. nice sparks!

    All you need to get is a MOV - I'm using the Panasonic ERZ-V07D220 wich
    is rated at 22V and 250A - soldered directly to the lugs on the banana
    jacks.

    I did not want to clip under 20V, so I can still use the ESR meter to
    check the condition of rechargable batteries. If you weren't aware, the
    DS (Bob Parker design!) ESR kit K-7214 will also check the ESR of
    batteries. I have a brief write up on

    http://www.flippers.com/esrkthnt.html#battery

    John :-#)#
    --
    (Please post followups or tech enquires to the newsgroup) John's
    Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9 Call
    (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games)
    www.flippers.com "Old pinballers never die, they
    just flip out."
     
  2. budgie

    budgie Guest

    Suggested source?
     
  3. Guest

    John;

    I think there is no reason for it to even tolerate 20 volts. It does
    not need any voltage higher than its test signal. Setup to test current
    or voltage, doesn't matter.

    If you want to test ESR on charged batteries, you can capacitively
    isolate it with a large electrolytic.

    BTW, what kind of ESR readings should one expect from a given battery ?
    Is it like a go/nogo thing, or are you trying to match these batteries
    in series or something like that ?

    You have piqued my curiousity.

    JURB
     
  4. Ah, well, I did provide the link to the battery test on flippers. Not
    much info, but it is a guidline for interested folks to expand on.

    I wanted to protect the meter from accidental surges. I also want it to
    be somewhat idiot proof. So having to remember to put a capacitor in
    series with the meter to check a battery is easy to forget...don't ask
    how many times I've destroyed a peice of test equipment by touching a
    charged capacitor or live circuit (OK, maybe ten times). Bob and I have
    had too many (perhaps 20(?) out of 12,000) kits blown up blown up and
    more simply damaged.

    I got the MOVs (Panasonic ERZ-V07D220) from Digi-Key for $0.34C - about
    30 cents US, 20V 250A.

    Best to quote messages you respond to as well, so here is the link I spoke of:
    http://www.flippers.com/esrkthnt.html#battery

    John :-#)#
    --
    (Please post followups or tech enquires to the newsgroup) John's
    Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9 Call
    (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games)
    www.flippers.com "Old pinballers never die, they
    just flip out."
     
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