[Amps] 8877 Test

[R.Measures]

On Feb 14, 2005, at 8:25 AM, TexasRF at 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