on a digital multimeter

The insulation test generates 500V - so make sure your DMM can handle that much!

 

Ok I opened her up. Well made and tight fit. There is one cap 1500v 0.1uf - sounds expensive and two other items I have no clue on and 4k7 3 or 5w resistor. I have an old scope I have a small clue with but no cap meter. Any pointers how to proceed. I like Max's idea on the cap. Electrotherapy better than gin?

 

The insulation test generates 500V - so make sure your DMM can handle that much!

Mine says 600 v ac/dc and china. Good enough ........

 

You'd get more excitement charging up a 385V 560uF reservoir electrolytic - but you'd have to stand there winding the handle an awfull long time!

I'm thinking of tacking it to my recent exercise timer - to give the trainer a job to do. Now I kow that 500v is more than 2v I may change tack. What to do with 500v that's friendly?

 

Nowadays its easier to use the inverter from a disposable camera - smaller and more discrete.

Simultaneous Disposable and Camera were not in our vocabulary at the time!
Max.

 

Simultaneous Disposable and Camera were not in out vocabulary at the time!
Max.

But it is *nowadays*.

 

But it is *nowadays*.

NO! Really?
Max.

 

If your Megger reads 1 meg with the leads open you have a defect megger. Cranking with nothing connected it should read infinity.

 

Disconnect the internal cap and give it a crank. What does the meter read now?

 

This is an old Megger I still use for checking leakage & Microwave HV rectifiers. Some pics of what your meter should give, eg 500V dc on the terminals & a 1Meg resistor.

 

There are two coils next to the cap. At least that's what I assume they are. Should there be continuity through these or are they some sort of inductor?

 

The capacitors aren't expensive .1uf 2000V dc are $1.35 ea Australian.

 

... A little plagiarism? A Megmet from Czechoslovakia?
Max.

 

A picture of the inside is worth a 1000 words.

 

A picture of the inside is worth a 1000 words.

is post 22 enough or would you like larger Bill?

 

Mine says 600 v ac/dc and china. Good enough ........

Its a long shot - but what's the Ohms per volt of you'r DMM?

*REALLY* cheap ones can be as low as 5000/per volt, anything decent should be *MUCH* higher.

Even so; a DMM will impose some load on the output of an insulation tester.

What resistance does the Megger read when you do that test.

 

Maybe a picture from a little further back so we can see a little more of the interconnections. Can you draw a schematic of the connections?

 

The 2 coils are probably wire wound resistors. This is what is in mine, theres not mutch to them.

 

Ours has a switch on the side marked "discharge" does yours have something similar to that? It would explain the low voltage...

 

Ours has a switch on the side marked "discharge" does yours have something similar to that? It would explain the low voltage...

No only probe connections.