Re: [Amps] 8877 Test

[R.Measures <r@somis.org>]

On Feb 14, 2005, at 8:25 AM, TexasRF@aol.com wrote:

> Hi Rich,
> Trying to not split hairs here:
> ?
> I should have said "at the onset of observable leakage" in stead of 
> simply "leakage".
> ?
> My definition of leakage is when it just begins to show some current 
> on a 60 microampere dc meter at the stated voltage.

Hello, Gerald. -- 10uA at 8kV is acceptable for a 3-500Z.  40uA at 15kV 
is okay for an 8170.

> The VOM is on the 6kv dc scale and in series with the high voltage 
> tester to provide approx 120 megohms series resistance to limit 
> current in case of a breakdown.?
> ?
> To be totally correct the voltmeter reading must be subtracted from 
> the dc voltage at the high voltage tester output terminals.

true
> ?
> If I can't see any movement of the 60 microampere meter then I call 
> that zero leakage. As you said though, there is always some leakage as 
> the insulation between the plate and grid, while very, very good, it 
> is not perfect; especially if the tube was handled without wearing 
> good gloves.
>  ?
> Did I leave out anything?

Spilling beer on the DUT increases leakage-I.
> ?
> 73,
> Gerald/K5GW

Richard L. Measures, AG6K, 805.386.3734.  www.somis.org

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