RE: OBIT Test Problem (reformatted) (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Tue, 23 Oct 2007 07:35:33 -0500
From: Terri Neeley <neeley_111@xxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: RE: OBIT Test Problem (reformatted) (fwd)

As a calibration technician I have a lot of experience with test equipment
of all sorts.  I can almost be sure it is your meter at fault in this
situation.  Try a high voltage probe for better accuracy.  Hope you figure
it out . Garry Neeley



> Date: Mon, 22 Oct 2007 19:59:34 -0600> From: tesla@xxxxxxxxxx> To: tesla@xxxxxxxxxx> Subject: RE: OBIT Test Problem (reformatted) (fwd)> > > ---------- Forwarded message ----------> Date: Tue, 23 Oct 2007 01:12:24 +0000> From: "Lau, Gary" <Gary.Lau@xxxxxx>> To: 'Tesla list' <tesla@xxxxxxxxxx>> Subject: RE: OBIT Test Problem (reformatted) (fwd)> > Wow, that's pretty whacky! If I didn't know better, I'd suspect that> quantum aetherdynamics was at play here. Not only is the Vo/Vi ratio> different for forward vs. reverse measurements, but the ratio varies with> excitation voltage. And stranger still, the ratio increases with> increasing excitation voltage for forward testing, but the ratio DECREASES> with increasing excitation voltage for reverse testing.> > Sorry, but I'm stumped. I wonder if this behavior is specific to> current-limited transformers? But thank you, you've certainly rewritten> the advice I would use and give to others trying to measure an NST's> voltage!> > Regards, Gary Lau> MA, USA> > > From: Mddeming@xxxxxxx> > To: tesla@xxxxxxxxxx> > Cc: gary.lau@xxxxxx, Mddeming@xxxxxxx> > Subject: OBIT Test Problem (reformatted)> >> > Hi Again,> >> > Here is the test data reformatted. Hopefully it will survive "moderation" in> > a readable form. ;^)> >> > Matt D> >> >> > Forward Test> >> > V in V out Ratio> > 0.00 0 (Vo/Vi)> > 4.65 350 75.27> > 8.48 650 76.65> > 12.33 950 77.05> > 16.73 1300 77.70> > 20.72 1620 78.19> > 25.15 2000 79.52> > 30.06 2400 79.84> > 35.33 2900 82.08> > 40.60 3390 83.50> > 45.20 3910 86.50> > 50.30 4230 84.10> > 55.65 4690 84.28> > 60.80 5110 84.05> > 65.50 5510 84.12> > 71.70 6000 83.68> >> > Reverse Connection (Raw Data)> >> > V in V out Ratio> > 0.00 0.0000> > 4.24 0.0292 145.21> > 10.61 0.0804 131.97> > 15.58 0.1233 126.36> > 20.55 0.1678 122.47> > 25.50 0.2132 119.61> > 29.60 0.2538 116.63> > 34.71 0.2995 115.89> > 41.00 0.3604 113.76> > 45.10 0.3890 115.94> > 50.80 0.4420 114.93> > 55.90 0.4920 113.62> > 60.90 0.5400 112.78> > 65.10 0.5800 112.24> > 69.80 0.6270 111.32> > 75.00 0.6760 110.95> > 80.80 0.7350 109.93> > 84.90 0.7740 109.69> > 90.00 0.8250 109.09> > 95.30 0.8770 108.67> > 100.80 0.9310 108.27> > 105.40 0.9770 107.88> >> > Scaled Projected test from above data> > V in V out Ratio> >> > 0.0 0 (Vo/Vi)> > 2.92 424 145.21> > 8.04 1061 131.97> > 12.33 1558 126.36> > 16.78 2055 122.47> > 21.32 2550 119.61> > 25.38 2960 116.63> > 29.95 3471 115.89> > 36.04 4100 113.76> > 38.90 4510 115.94> > 44.20 5080 114.93> > 49.20 5590 113.62> > 54.00 6090 112.78> > 58.00 6510 112.24> > 62.70 6980 111.32> > 67.60 7500 110.95> > 73.50 8080 109.93> > 77.40 8490 109.69> > 82.50 9000 109.09> > 87.70 9530 108.67> > 93.10 10080 108.27> > 97.70 10540 107.88> >> >> > > Subject: OBIT test Problem> > >> > > Hi All,> > >> > > I was running some tests today on a 10 kV, 23 mA OBIT I picked up for $1.00> > > at a yard sale.> > >> > > First I powered it with 0 to ~140 V on the HV side and read the LV side. I> > > then multiplied both readings by 100 which I thought would give me fairly> > > representative response curve for the transformer.> > >> > > I then applied 0 to ~ 60 V on the low voltage side and read the HV side> > with> > > my trusty Triplett 630-A meter, which has a built in 0-6000 VAC scale ,> > and> > > compared the results to the first test. NOT EVEN CLOSE!> > > (See results below) what am I missing?> >> >> >> >> > ************************************** See what's new at http://www.aol.com> >> >> > > 
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