Electrical res.reading
Comments
-
-
That would explain it. A neon lamp is a gas-discharge lamp, no continuity until the applied voltage is great enough to arc over.
I wonder if a megger would light one up. Time for an experiment!
0 -
No... sorry. You have to get the voltage high enough to start the arc. A megger doesn't do that (I hope!).ratio said:That would explain it. A neon lamp is a gas-discharge lamp, no continuity until the applied voltage is great enough to arc over.
I wonder if a megger would light one up. Time for an experiment!
Br. Jamie, osb
Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England0 -
Some meggers can supply thousands pof volts but very little current. If I recall a NE-2 needs about 90 v to fire and then it needs to be limited to under a milliamp or the bulb will fail in a short time.
https://en.wikipedia.org/wiki/Neon_lamp
BobSmith G8-3 with EZ Gas @ 90,000 BTU, Single pipe steam
Vaporstat with a 12oz cut-out and 4oz cut-in
3PSI gauge0 -
Depends on the megger and the neon lamp I suppose.Jamie Hall said:
No... sorry. You have to get the voltage high enough to start the arc. A megger doesn't do that (I hope!).ratio said:That would explain it. A neon lamp is a gas-discharge lamp, no continuity until the applied voltage is great enough to arc over.
I wonder if a megger would light one up. Time for an experiment!
If I recall the megohmmeter I used at a previous job did up to 2KV. That'll arc over a small neon lamp easily and then some.Single pipe 392sqft system with an EG-40 rated for 325sqft and it's silent and balanced at all times.
0 -
Could also happen with an LED and a series resistor. Unless you get enough voltage through the resistor to overcome the forward voltage drop of the LED, it won't register -- plus, it's polarity sensitive.0
-
How can I tell if my pilot light is neon or standard?0
-
I do hope that that megger had some major current limiting devices in it...ChrisJ said:
Depends on the megger and the neon lamp I suppose.Jamie Hall said:
No... sorry. You have to get the voltage high enough to start the arc. A megger doesn't do that (I hope!).ratio said:That would explain it. A neon lamp is a gas-discharge lamp, no continuity until the applied voltage is great enough to arc over.
I wonder if a megger would light one up. Time for an experiment!
If I recall the megohmmeter I used at a previous job did up to 2KV. That'll arc over a small neon lamp easily and then some.Br. Jamie, osb
Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England0 -
Does it have a colored lens? Can you see the bulb itself? Without any kind of colored lens the color of the light is orangish. The bulb is clear glass, generally about 3/16 diameter & less than a half-inch long, with two wires going into the bottom. Inside, the wires connect to two posts that run parallel to each other some small distance apart & don't actually touch. If it's in an assembly of some kind, it may be stamped "Ne" somewhere.0
-
I don't know.Jamie Hall said:
I do hope that that megger had some major current limiting devices in it...ChrisJ said:
Depends on the megger and the neon lamp I suppose.Jamie Hall said:
No... sorry. You have to get the voltage high enough to start the arc. A megger doesn't do that (I hope!).ratio said:That would explain it. A neon lamp is a gas-discharge lamp, no continuity until the applied voltage is great enough to arc over.
I wonder if a megger would light one up. Time for an experiment!
If I recall the megohmmeter I used at a previous job did up to 2KV. That'll arc over a small neon lamp easily and then some.
I never tested it on my self, it was used for hi pot testing power tools.Single pipe 392sqft system with an EG-40 rated for 325sqft and it's silent and balanced at all times.
0 -
If it's an incandescent bulb and it works, you will read a resistance using a normal ohmmeter. A neon bulb would be used in older equipment, but there was some overlap in the 1980s where it could potentially have been either neon or LED. How old is the equipment it's in? How big is the lens, and what shape?0
-
A megger is an insulation tester - uses high voltage to check the leakage resistance of insulation. I've got the little Fluke, ranges from 50 to 1000 test voltage. Industrial models can go to 10k volt & higher. I recommend it, if you have a need. It doubles as a multimeter, so it's not necessarily an additional thing to carry. I've proven a number of intermittent shorts with it that were causing our service guys to pull their hair out.
Now, to find a neon lamp...
0 -
How odd. I posted that in response to Jamie Hall's first post above. Must have gotten stuck somewhere.
Still haven't found a neon lamp though.
0
Categories
- All Categories
- 86.3K THE MAIN WALL
- 3.1K A-C, Heat Pumps & Refrigeration
- 53 Biomass
- 422 Carbon Monoxide Awareness
- 90 Chimneys & Flues
- 2K Domestic Hot Water
- 5.4K Gas Heating
- 100 Geothermal
- 156 Indoor-Air Quality
- 3.4K Oil Heating
- 63 Pipe Deterioration
- 917 Plumbing
- 6.1K Radiant Heating
- 381 Solar
- 14.9K Strictly Steam
- 3.3K Thermostats and Controls
- 54 Water Quality
- 41 Industry Classes
- 47 Job Opportunities
- 17 Recall Announcements