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Re: Gap voltages AC vs. DC
From: D.C. Cox[SMTP:DR.RESONANCE-at-next-wave-dot-net]
Sent: Friday, January 02, 1998 6:31 PM
To: Tesla List
Subject: Re: Gap voltages AC vs. DC
to: Adam
Did the machine bolts have only a 180 degree circular area? If so, the
sharper edges would disrupt the electric field and skeer the results.
Even in the spark jumps over the rounded area the electric field can be
modified by the sharp edges within 3-4 (ball) diameters and give you bad
readings. Try a true sphere is possible and the results should be closer.
DR.RESONANCE-at-next-wave-dot-net
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> From: Tesla List <tesla-at-pupman-dot-com>
> To: 'Tesla List' <tesla-at-pupman-dot-com>
> Subject: Gap voltages AC vs. DC
> Date: Thursday, January 01, 1998 4:34 PM
>
>
> 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
>
>
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