>From: ToddRoberts2001@aol.com
>To: amps@contesting.com
>Subject: Re: [Amps] Hi-Pot Tester for sale
>Date: Sun, 9 Jul 2006 09:40:57 EDT
>
>In a message dated 7/9/2006 8:57:13 AM Eastern Standard Time,
>jbigham2@kc.rr.com writes:
>I have never used one of these, what do you do? Hook it up to the item to
>be
>checked and begin increasing the Kv and watch for current to flow at some
>point? Then note the voltage at which the current flows? I would assume
>such a
>device is very limited in its current ability.
>Thanks for info.
>Gene KB0GU Bigham
>
>It doesn't look like there is enough info in the listing to tell if the
>hi-pot tester would be suitable for checking items an amplifier builder
>would be
>interested in like vacuum variables, vacuum relays, or vacuum tubes. For
>checking those items for high-voltage leakage you need a hi-pot tester with
>a
>microammeter range capable of reading only a few microamps and a voltage
>range of
>probably at least 0-10KV. The item listed has what looks like a meter range
>that
>reads in milliamps - this would be way too high a range. We would need
>something with a scale of perhaps 0-10 or 0-20 microamps. Also the item
>listed does
>not say how many KV it will adjust to. Many vacuum variables have operating
>voltages of 10KV or more so you want a hi-pot tester that will go to at
>least
>10KV or more. Any object reading more than 5-10 microamps of leakage at its
>normal operating voltage would be suspect. 73 Todd WD4NGG
It looks like it does 0 - 20kv up to 500ua which is more that enough.
Hopefully one can limit the current somehow. Info can be found at AG6K and
K8CU website.
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