Re: 1/4 wave TC (metering) (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Mon, 30 Jul 2007 05:45:52 -0700
From: Barton B. Anderson <bartb@xxxxxxxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: 1/4 wave TC (metering) (fwd)

His gap was firing at 40V input with a 9/120 NST and near resonant cap 
size. The gap was certainly limiting the voltage. Where did measuring 
with TC running come from?

Bart

Tesla list wrote:

>---------- Forwarded message ----------
>Date: Mon, 30 Jul 2007 08:47:03 +0800
>From: Peter Terren <pterren@xxxxxxxxxxxx>
>To: Tesla list <tesla@xxxxxxxxxx>
>Subject: Re: 1/4 wave TC (metering)
>
>I wouldn't trust any readings with the TC running. High frequency transients 
>will capacitatively bypass your HV resistors and give marked errors.  It may 
>well be accurate at 60Hz but may be way out when a TC is running. Sometimes 
>it is just local fields and the meter reads with only one wire connected. 
>This is much more likely than ferromagnetic resonance IMO.
>My meter
>http://tesladownunder.com/HighVoltage.htm#Voltmeter
>Peter
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>>---------- Forwarded message ----------
>>Date: Sat, 28 Jul 2007 11:28:18 -0700
>>From: Ed Phillips <evp@xxxxxxxxxxx>
>>To: Tesla list <tesla@xxxxxxxxxx>
>>Subject: Re: 1/4 wave TC (fwd)
>>
>>Bart and all
>>I have built a meter that appears to work well in measuring high
>>voltages. I use a 1 ma movement and a very long string of resistors in a
>>voltage devider. The meter is fed through a bridge retifier. I
>>calibrated the unit and it appears accurate to about 5%. When the system
>>goes into resonance the voltage jumps to about 20kv with 40v input to
>>the NST. I would not have believed it."
>>
>>I would have.  A number of years ago I blew up the 5 kV scale of a
>>Simpson 260 measuring the secondary voltage of a 15 kV, 60 ma transformer
>>with 0.006 ufd load.  Was ramping up the voltage with a variac and the
>>thing obviously went into a ferromagnetic resonance mode at around 25
>>volts on the primary.  Never again!  High leakage reactance transformers
>>with capacitive loads are tricky things at best.
>>
>>Ed
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