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Tool Talk Discussion Forum

Field Effect Sensor

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Slowpoke

01-13-2008 23:38:23




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Should I buy a Sencor FE20 Field Effect Sensor? A fellow offered one for $20 and it comes with a high voltage probe. The ohms scale is x1 to x1 meg in 6 or 7 positions, AC, DC, and 3KV, 10KV, and 30KV for the probe. The label says resistors and transistors can be checked in the circuits without disconnecting but there's no manual. It uses a C battery which I think is pretty much dead since I can't get 0 ohms or adjust to 0. The mirrored needle kind of wanders around on its own. I can't try a new battery because the case is screwed together and I see no other battery access. It's in a heavy steel case about the size of a kid's lunchbox. It's cheaper than going to Las Vegas, but.....Deal or No Deal?

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john *.?-!.* cub owner

01-14-2008 07:45:03




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 Re: Field Effect Sensor in reply to Slowpoke, 01-13-2008 23:38:23  
I used to have one till it was stolen, and they were top of the line meters in their day, but that day was 30 or more years ago. They do have a couple of problems , one, the field effect transistors were very easy to burn out, and unless you were careful required frequent replacement. A second problem was that they used a rubber like substance to lock the calibration controls, and with age it would contract changing the calibration. As a novelty I would like to have one back, since it was my first really good meter, but as a practical use item, you can buy better ones for 30 or 40 dollars new. It does require power form it's batteries in all uses, not just for the ohms readings.

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soundguy

01-14-2008 07:26:43




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 Re: Field Effect Sensor in reply to Slowpoke, 01-13-2008 23:38:23  
see if any of the voltage ranges work without power.. some meters do.. some don't.. not sure about that one.

for sure ohms range won't work without power.

soundguy



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tech4

01-14-2008 06:36:52




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 Re: Field Effect Sensor in reply to Slowpoke, 01-13-2008 23:38:23  
That is a good meter and certainly worth $20 if working but if not working and particular if the meter movement is bad is worth nothing as the meter movement is hard to impossible to find. The lo ohms scale uses a very low voltage (.08 volts) that will not trigger transistor and diode junctions to check components in circuit. There are two batteries in the unit one 9 volt for power and one 1.5 volt cell for ohms only. On the low ohms scale the meter will not zero because of the low resistance in the test leads. A manual can be downloaded off the INTERNET.

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Slowpoke

01-14-2008 11:28:27




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 Re: Field Effect Sensor in reply to tech4, 01-14-2008 06:36:52  
A decal on the meter says it uses a C cell...



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tech4

01-14-2008 15:45:09




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 Re: Field Effect Sensor in reply to Slowpoke, 01-14-2008 11:28:27  
Slokepoke it is not a C cell but 7 C cells. One C cell for OHMS and 6 C Cells connected in series for 9 volts or a 935 9volt battery.
you can download the manual here



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IH2444

01-14-2008 06:07:47




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 Re: Field Effect Sensor in reply to Slowpoke, 01-13-2008 23:38:23  
The HV ranges might be nice, but the rest of that can pretty well be covered with a $3.99 DMM from harbour freight.



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