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Re: Gap voltages AC vs. DC (fwd)
From: Tesla List Owner[SMTP:listown-at-pupman-dot-com]
Sent: Friday, January 02, 1998 1:01 PM
To: tesla-at-stic-dot-net
Subject: Re: Gap voltages AC vs. DC (fwd)
---------- Forwarded message ----------
Date: Fri, 2 Jan 1998 00:43:35 -0700
From: richard hull <rhull-at-richmond.infi-dot-net>
To: Tesla List <tesla-at-pupman-dot-com>
Subject: Re: Gap voltages AC vs. DC
At 05:34 PM 1/1/98 -0600, you wrote:
>
>From: Adam[SMTP:absmith-at-tiac-dot-net]
>Sent: Thursday, January 01, 1998 3:56 PM
>To: tesla list
>Subject: Gap voltages AC vs. DC
>
>
>I know about the table for DC sparkgap voltage breakdown that is in the
>CRC handbook. I decided to do a little gap experiment to see if 60Hz
>voltages had similar breakdown voltages. My AC results turned out not to
>be anywhere near the DC test results in the CRC handbook.
>
>I used a Powestat 116 7.5A variac, a wavetek 27XT DMM measuring voltage
>out of the variac, and a webster 10,000V 23mA transformer in brand new
>perfect condition. My gap is made from two machine bolts, with 2.5cm
>dia. round heads, in fairly still air, gapped using feeler gauges. I
>used a muffin fan to air out the gap between tests, and averaged the
>results of 4 measurements at each gap setting.
>
>Note that since I do not have a 40kV probe, I am measing voltage input to
>the OBIT and calculating ouput voltage, assuming on the OBIT to be
>linear. I'm not sure if this is a good assumption or not.
>
>Gap Variac Volts RMS Volts Peak
>
>0.030 32 2667 3771
>0.060 53 4416 6246
>0.090 72 6042 8544
>0.120 92 7667 10842
>0.150 110 9167 12964
>0.180 128 10667 15085
>
>I am going to repeat this with sharp points later on.
>
>-Adam
>
>--------------------------------------------------------------------------
>Adam Smith
>absmith-at-tiac-dot-net
>Epoch, Inc. Digital Music Project
>
>www.tiac-dot-net/users/absmith/ MP3 Demo Tracks Now Available!
>--------------------------------------------------------------------------
>
>Adam,
Neon sign transformers are pretty much pieces of crap they are not even
close to there name plates to with say 20%. They don't have to be. There
is no such thing as precision neon lighting. Only a true potential
transformer can be relied upon in a measurement like you are attempting.
Also the voltage of breakdwon is based on the peak voltage and not the RMS
values. (1.4 times higher)
60 hz values of peak voltage breakdown for the exact same electrodes should
track fairly close to the DC values. +/- 5%.
Richard Hull, TCBOR
>
>
>