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 Post subject: dim bulb tester???
PostPosted: Oct Wed 21, 2020 9:58 am 
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Joined: Jul Fri 10, 2020 4:04 am
Posts: 317
Location: La Crosse Ks.
Is this a dim bulb tester. Also looks like it can test neon lights.
Thanks!
Richard


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 Post subject: Re: dim bulb tester???
PostPosted: Oct Wed 21, 2020 10:29 am 
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Joined: Jun Fri 19, 2009 6:34 pm
Posts: 10120
Location: Long Island NY
It’s more properly known as an appliance tester but one of its functions is dim bulb tester. The “neon test lamp” refers to the neon bulb on the front panel. It is connected across a capacitor kept charged to peak line voltage (about 160 V) and used as a sensitive continuity checker. The test lamp jacks allow you to use an incandescent bulb as a low resistance continuity checker. The 110 Volt/Test Lamp switch connects the AC outlet to the test lamp, making a dim bulb tester, or to the line directly, bypassing the bulb. The meter on/off switch shunts the ammeter so you don’t peg it when dealing with appliances like washers and air conditioners that draw a lot of inrush current.

This was a kit that was offered by a mail order electronic and electrical training program. The students would put them together and use them for various other course projects. If they were successful they’d have a useful tool to take into the field.

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 Post subject: Re: dim bulb tester???
PostPosted: Oct Wed 21, 2020 1:24 pm 
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Joined: Nov Wed 30, 2016 7:35 pm
Posts: 8459
Location: Sunbury, Ohio 43074
Here's a link to information on the tester https://www.antiqueradio.org/ChristyTester.htm

It includes a "how to make one" set of instructions, and a schematic

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 Post subject: Re: dim bulb tester???
PostPosted: Oct Wed 21, 2020 3:00 pm 
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Joined: Jun Fri 19, 2009 6:34 pm
Posts: 10120
Location: Long Island NY
BTW, this thing is decidedly not UL listed. That flashlight bulb in the open terminal socket, with the bare shunt wire across it, is used to measure current when the ammeter is switched off. The socket and shunt are at line voltage! :shock:

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"Hell, there are no rules here--we're trying to accomplish something!"

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 Post subject: Re: dim bulb tester???
PostPosted: Oct Wed 21, 2020 3:33 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 1069
Location: St. Louis, MO, USA
With the decreasing availability of incandescent light bulbs are there any that could be used in a dim bulb tester,maybe a halogen type?

Dennis


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 Post subject: Re: dim bulb tester???
PostPosted: Oct Wed 21, 2020 3:45 pm 
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Joined: Jun Fri 19, 2009 6:34 pm
Posts: 10120
Location: Long Island NY
Halogen and high efficiency incandescents work the same as the old ones in dim bulb testers. They just cost more, but seems to me that the lamps in dim bulb testers get the filaments knocked out of them or broken before they ever burn out so with a little care they will last a long, long time.

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"Hell, there are no rules here--we're trying to accomplish something!"

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 Post subject: Re: dim bulb tester???
PostPosted: Oct Wed 21, 2020 4:16 pm 
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Joined: Jul Fri 10, 2020 4:04 am
Posts: 317
Location: La Crosse Ks.
So other than a test equipment collector's interest and the fact that you can build a dim bulb tester a lot cheaper than the $40 they're wanting for this on FBMP, it most likely wouldn't be of much interest to most radio restorers. Interesting that it's a kit built unit.

Thanks!
Richard


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