Odd multimeter question

[venemous]

Picked up a cheap harbor freight DMM, mainly to test battery voltage. I normally use my MVP2 to check resistance since I tend to rebuild on there for convenience. That being said, I was comparing the readings between the DMM and MVP on various coils, cartos, etc and was happy to see they agreed across the board with one glaring exception... My nimbus clone. For some reason the DMM absolutely refuses to read the resistance on it. I've tried reading at the 510 connector and at the posts. Any idea why this would happen?

 

[Orb Skewer]

Nope ...............................

 

[suspectK]

I'm assuming the rda is giving you a reading with the MVP.. if so, I have no idea why... if you don't have an open circuit, the multimeter should give you a reading. Other than that, make sure you're checking the resistance/continuity/ohms, not voltage or other options?

 

[Jayvaps]

Does the dmm display anything?

 

[venemous]

Yes, MVP reads the rda. DMM is set correctly, used it to verify resistance of a few other doohickies immediately before and after.

When I put the leads onto the RDA it changes very rapidly back and forth between a high resistance (15-20ish ohm) and zero.

 

[suspectK]

I'd contribute that to contact resistance.. see what the readings are on it from the contact pin and positive post. I'm not familiar with that RDA..is that just an UD IGO-w? I haven't gotten mine in yet, so I don't know what alloy the screws are made of.

 

[Sthur]

Normally when the resistance jumps crazy you have bad connection with rebuilds or not a solid connection.

Remember to touch both leads on dmm together (might read 0.1 - 0.2) subtract this from rebuild to get correct reading.

Also on my rda I touch each screw when coil is to test and if that jumps, your connection are loose somewhere.

 

[suspectK]

Oops, misread. Some reason I thought reading was confined in the high resistance readings.. I'm going to put phone down. I've been sloppy today...