>
>Message text written by Bill Aycock
>
>>Measurement of an actual 4CX250B shows that the insulator surface path is
>just under 7mm long, as opposed to slightly over 10mm on the drawing.<
>
>As a troll-avoidance measure, perhaps what I should have said was:
>
>Physical measurement of an Eimac 4CX250B (date code 8748) using Brown &
>Sharpe digital calipers (last calibration date 6/00) and a steel ruler (RS
>stock number 585-307) in an office ambient temperature of 18 degrees
>Celsius shows that the insulator surface path is 6.9mm long. This is of
>course plus or minus any measurement error on my part.
>
>Is the value of breakdown voltage across this gap likely to be the same as
>that for two similarly separated points in air? Or does the presence of the
>ceramic have any effect? Presumably surface contamination would affect it?
>What order of voltage is required for breakover?
>
This is too dependant on the amount of insect parts that happen to be
present at the time. // During 20+ years, my 2 x 4cx250R 2m amp. never
had a problem with insect fragment arcs.
cheers, John
- Rich..., 805.386.3734, www.vcnet.com/measures.
end
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