[R-390] Black beauties
Kenneth G. Gordon
[email protected]
Sun, 16 Mar 2003 22:30:40 -0800
> I have a Cap tester on this ExTech multimeter I just purchased.
> It seems to be accurate. The problem I have is just how reliable is
> the meter checking.
>
>
>
> Kenneth A. Crips W7ITC, Cheyenne, Wyoming
Multi-meter cap testers don't have high enough voltage to really
check leakage in caps. They can do a decent job of measuring
capacitance only.
You would need a Sprague Tel-Ohm-Mike, or Heathkit C-3 or IP-28
, or equivalent, type of capacitor checker to measure leakage. You
have to check the caps at their rated voltage in order to get an
accurate idea of leakage.
One way you can check them for leakage without the above listed
capacitor checker is to connect them in series with a decent
milliameter across a source of HV at the rated voltage of your
capacitor. If the milliameter reads much above a microamp or two,
the capacitor is leaky.
Ken Gordon W7EKB