Re: Input power measurement

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Skip Greiner by way of Terry Fritz <teslalist-at-qwest-dot-net>" <sgreiner-at-wwnet-dot-com>

John and All

You are quite correct. There are numerous opinions and many avenues open for
experiment. I received a circuit for a solid state watt meter from one of
the fellows in TCBOR a while back and I think the first thing I must do is
to build it, finally. Of course it would still have to be calibrated
somehow. If we are to really evaluate efficiency , we need to find an
acceptable ( to all )way to measure the various input parameters. Since most
of us modify our transformers in some way, the biggest sparks do not
necessarily indicate maximum efficiency. I plan to report to the list
anything  I might come up with. Thanks to all for your many comments.
Skip


-----Original Message-----
From: Tesla list <tesla-at-pupman-dot-com>
To: tesla-at-pupman-dot-com <tesla-at-pupman-dot-com>
Date: Thursday, March 13, 2003 10:29 AM
Subject: RE: Input power measurement


 >Original poster: "John H. Couture by way of Terry Fritz
<teslalist-at-qwest-dot-net>" <couturejh-at-mgte-dot-com>
 >
 >
 >Skip -
 >
 >You have received several posts regarding your question of why 2000 watts
vs
 >1080 watts. What have you learned?  Is it
 >
 >    1. Because of modified transformer?
 >    2. Low power factor?
 >    3. Resonant charging?
 >    4. LTR capacitor?
 >    5. Some other reason?
 >
 >Do you intend to do more research regarding your question?
 >The reason I am asking is that this question has come up before on the List
 >and there are always replies with multiple opinions. Your question
obviously
 >has a lot of potential for research.
 >
 >John Couture
 >
 >---------------------------------
 >
 >
 >-----Original Message-----
 >From: Tesla list [mailto:tesla-at-pupman-dot-com]
 >Sent: Saturday, March 08, 2003 2:52 PM
 >To: tesla-at-pupman-dot-com
 >Subject: Input power measurement
 >
 >
 >Original poster: "Skip Greiner by way of Terry Fritz <teslalist-at-qwest-dot-net>"
 ><sgreiner-at-wwnet-dot-com>
 >
 >Hi all
 >I am using a 9kv at 120ma NST. In operation I use an iron vane ammeter
 >(known to be within 5% accuracy) to monitor current. My mains voltage is
 >nominally 117V. Interestingly the current into the NST is about 17A when
 >running in resonant mode. It is my understanding that an iron vane meter
 >reads true input current regardless of waveform. Therefore my input power
to
 >the NST is nearly 2000 watts.
 >
 >I would appreciate comments from anyone who can help explain the
discrepancy
 >between the 1080va rating of the "current limited NST and the measured
input
 >in resonant mode operation.
 >Skip
 >
 >