capacitor tester schem

[skal1]

Hi fellow diyer's

i need a cheap do it yourself capacitor  tester  what can measure leakage and open/short  circuit's.



skal1

 

[mrclunk]

Here ya go

http://www.groupdiy.com/index.php?topic=31110.0

Haven't made one yet but from my reading thus far it does pretty much everything you might need from a cap esr tester.

I just havent got round to etching a pcb for it.
If someone does me a pcb i'll swap for a Sifam 1ma meter that suits the circuit...

paul
Edit: Theres an error on the PCB layout i linked too, check the original thread for details

 

[CJ]

this was stolen from gerald weber.
real low tech.

http://www.groupdiy.com/index.php?topic=24434.0

 

[skal1]

Hey thanks lads.


@mrclunk  ,give a week i will do on for , ragga style ;D


@cj ,what effect should be happening to the meter in this circuit if the capacitor is .

a}leaking

b}open

c}short 


skal1

 

[mrclunk]

skal1, nice one!

The meters a model 19W i think, havent got them here right now.
Can send u a pic when i get home if u like?

edit: the meters are Director 24A 1ma

 

[benlindell]

I built myself one of these:

http://www.dpcav.com/xcart/product.php?productid=16338&cat=262&page=1

 

[CJ]

sk-1

Wire the circuit
Short the alligators
Measure the voltage (you are reading battery volts)
Hook up a cap to test
Press the button to charge the cap
Release the button, let the voltage stabilize,  and read the hopefully low voltage, in this case, I had 0.140 volts dc.
Now divide the low number by the batt volts to get leakage.
Don't forget to multiply by 100 to put it in percent form.

So, in my test-

0.140 volts divided by 9.45 volts (new 9 volt batt reads high)
so 0.14/9.45 = about 1.5 percent leakage for a lytic.
Try it on a spraque orange drop and you should see zero leakage.
Anything over 1 percent....is bad if a coupling cap.

 

[skal1]

hey  thanks cj

i  assume this device will not s how the effect of open and short circuit ?


skal1