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[AMPS] construction of parasitics

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Subject: [AMPS] construction of parasitics
From: (2)
Date: Sat, 21 Jul 2001 16:25:33 -0700
>At 06:48 AM 7/21/2001 -0700, you wrote:
>> >
>>Steve -
>> >
>>3.   there should be a 10 - 15 ohm, 10w vitreous-enamel (glass) coated
>>resistor in series with the HV+.  A ceramic block type power resistor
>>should not be used.
>Why not the ceramic (cement) type Rich ?  Reliability ? Shrapnel if an 
>event occurs ?
/\  To be successful, a glitch resistor must not break down internally 
during a major fault.  If it does,  a metal-vapour arc takes place - 
which limits the V-drop across the resistor to c. 20v instead of the 
needed several kV.  Thus, the desired ability to limit current to a 
finite value is lost.  Shrapnel and internal breakdown are problems with 
ceramic-type resistors.  To find out if a glitch resistor is up to the 
task at hand,  (Note:  the meters and their shunts should be protected 
with suitable glitch-diodes). short the anode supply to ground with a 
large plastic handle screwdriver.  If there is a loud noise, the circuit 
breaker opens, there is no sign of damage, and the ohms are unchanged, 
the glitch resistor did its job.  

cheers, Phil.
>>-  R. L. Measures, 805.386.3734,AG6K,
>>FAQ on WWW:     
>>Administrative requests:

-  R. L. Measures, 805.386.3734,AG6K,  

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