|[AMRadio] Shorting stick|
John E. Coleman (ARS WA5BXO)
wa5bxo2005 at pctechref.com
Fri Jun 2 17:46:18 EDT 2006
This is also true Jim. This is why I use a VTVM with a 1 meg resistor in
the probe. I make up a special resistor probe divider network in addition
to this to do measurements of HV with. I occasionally check the voltmeters
on the front of the transmitter for calibration using this lash up. But it
also makes a very good pre-checker for voltage before trouble shooting. Of
course if the transmitter is all working correctly and I just want to check
something or make a modification which I do on a regular basis, then I watch
the meters fall when I flip the plate switch off. After they have reached
Zero volts then I insert the shorting bar or stick to insure that the plate
voltage can't be activated again with out tripping the breaker HIHI.
PS: the bleeder resistors had best be radiating heat after the plate supply
is off or I suspect trouble.
True, but should something be wrong with the meter following a disaster, it
might not show a charge. What an arc would be drawn if 3 KV remained
somewhere and you gave it a direct short.
I have always seen a high value resistor in these things.
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