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Registered Member #480
Joined: Thu Jul 06 2006, 07:08PM
Location: North America
Posts: 644
Patrick -
You wrote:
"Oh yaeh and my NST name plate says 24KVAC at 28ma, however i found at 122.5vac input, the output was 34~36 KVac at 5ma."
There's definitely something wrong with that statement. As far as I know, no commercial neon sign transfromer (NST) has ever been produced with an output voltage greater than 15kV. Either you don't have an NST, or you mis-read the nameplate. Also, the claim of 36kV output from a transformer rated at 24kV seems to be difficult to understand unless you had a capacitor connected across the secondary that was very close to resonant value at 60 Hz.
Can you post a clear photo of the "NST" nameplate, and describe how you measured the 35kV output voltage and 5ma output current?
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Yeah Herr zapp my bad i was a little buzzed from the peppermint schnaps from that night, i meant the name plate says 12kvac at 24ma its really big and really old from like the 1930's anyway, unloaded it measures about 24kvac but then drops to 16~18kVac at light load (2-5ma). And levels off at 12~14 or so kv at medium load like 15ma. i made my measurement with a high voltage Fluke probe for a DMM that belonged too ohlone college back in 2001.
I will add more in a minute , sorry for the screw up, entirely my fault.
OK im back, herr zapp the fluke hv probe is just a simple resistive divider (no compensation), ok for 50/60 hz but i found it to be useless above 500 hz and at 700 hz (sine wave) i was getting bougus measurements.
as for the current i use a 1/4 watt resistor i think it was 1000 ohms,(in series, with great care taken to keep the meter floating) so each Milliamp was read as 1 volt and i used a simpson 260 analog meter(i think) and then a fluke 73 DMM, both agreed quite well. let me find my lab book just to be sure. will post again when i find it
Registered Member #2579
Joined: Mon Dec 28 2009, 03:33PM
Location:
Posts: 1
In my experience the lifters will fly with either DC or AC and with any relative polarity. The critical factors is not polarity, but voltage. Thrust tends to rise with the voltage in these devices.
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Ion Lifter-- "Anti-Gravity"
