[Hammarlund] Another tidbit of info.

[David Franklin]

Gary,

There is an excellent article in ER #189 by W7KEB on the Heathkit C3 
Condenser Checker.

The 1/2 watt resistors in the voltage divider for the leakage test 
frequently go high.  The resistors are run close to the limit of their power 
ratings which contributes to the problem.  It was designed for short 
duration term leakage testing.  I frequently use mine to reform 
electrolytics so I  replaced mine with 1 watters.

These are 22K also so the design is probably similar.

73,
Dave
KI4JSN

----- Original Message ----- 
From: "GBrown" <gkbrown at gwi.net>
To: <hammarlund at mailman.qth.net>
Sent: Monday, May 30, 2005 7:17 AM
Subject: [Hammarlund] Another tidbit of info.


I have been restoring a SP-600-JX/1. The restoration is complete but thought
some of you folks would like to know this.
I used a Heathkit IM-11 to test my capacitors. Well, just for giggles, I
measured the voltage for the leakage test. These voltages were waaaaaaay
down. This was causing some of the mica caps I was testing to test "GOOD"
but in fact, were "BAD" (leaky).
CURE:
    These is a 22K resistor on the voltage switch, easy to get to, which
went to 45K. I replaced the resistor and now have the rite voltages as per
the switch selection.
    This may also hold true with other cap. testers from Heathkit, from this
era.
    Because the voltage was low during cap testing, I was assuming the cap
was good. Would of saved me allot of time if I had checked my test equipment
first.
Regards,
Gary...WZ1M

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