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Re: Tube Coil Wattage?
From: Benson_Barry%PAX5-at-mr.nawcad.navy.mil[SMTP:Benson_Barry%PAX5-at-mr.nawcad.navy.mil]
Sent: Saturday, November 15, 1997 5:11 PM
To: tesla-at-pupman-dot-com
Subject: Re: Tube Coil Wattage?
Hi Jeff, All,
Problem statement: Wattmeter?
1. Take a power resistor and tape a meat thermometer
to it with teflon thread seal tape (hi temp). Calibrate
it by making a chart of watts through VS degrees
(rare = 500 watts, medium = 800 watts, etc). This
will act as a power integrator so you need to run
power through it until the temperature of the resistor
equilibriates.
2. Take an electromagnet and hang it in a fixture
above a hunk of iron attached to a spring scale
calibrated in ounces for small coils or pounds
for big coils. This will convert average Amperes
to pounds (or ounces). Now measure the voltage
across the coil with a full wave bridge rectifier
connected to a hi Z voltmeter with a slow response.
To get average power multiply volts by pounds ( or
ounces).
3. Tape a thermometer to an extension cord and
measure the temperature while plugged into
different appliances. Make a chart of temperature
VS nameplate wattage of the appliance.
4. Since the output of the coil is so small you will
need to use a smaller resistor for metering its
output. Something like a few 2 watters strung
together in a tube filled with mineral oil to keep
it from being arced over.
5. Put an electric spinner on the toroid. Hang the toroid
from the ceiling by weed wacker line. Remove the
secondary. Take a Van De Graaf or Whimshurst
or Dirod and charge up the toroid through a
microampere meter with a diode bridge while
neasuring the RPM's of the spinner with a strobe light.
Periodically take a reading of RPM, microamperes,
and voltage (with a sphere gap) for a table.
Multiply the volts by the microamperes to get average
power VS spinner rotation speed. Put the secondary
back and run the coil. Measure the RPM's of the
spinner with the strobe light and compare with the
chart to get average watts output.
6......
Barry
----------
From: "tesla"-at-pupman-dot-com-at-PMDF-at-PAXMB1
To: Benson Barry; "tesla"-at-poodle.pupman-dot-com-at-PMDF-at-PAXMB1
Subject: Re: Tube Coil Wattage?
Date: Thursday, November 13, 1997 11:35AM
From: Jeff W. Parisse [SMTP:jparisse-at-ddlabs-dot-com]
Sent: Wednesday, November 12, 1997 10:34 AM
To: Tesla List
Subject: Re: Tube Coil Wattage?
Richard,
O.K. I accept that. However, when people ask "Well, gee, what kinda power
ya puttin' out with that thingie". I want to be able to give an estimate
rather
than reply with "it's a mystery even to the best Tesla coil engineers...".
I guess input power. I could equate it to hairdryers. "Well, it's about one
and
a half hairdryers".
Jeff W. Parisse, Art Director
Digital Design Laboratories
www.ddlabs-dot-com
>No RMS meter is accurate here
>either as the waveforms are trash incarnate. Only a digital storage scope
>with math functions could figure it all out and then that would only be for
>the period under mesurement.....Bottom line.......it is far more trouble
>than it is really worth.
>
>Richard Hull, TCBOR
>