Milliohm meter

Considering a milliohm meter to measure the resistance of windings in a 3-phase motor. Typical resistance is in the range of 0.1 ohm and need to discern probably 0.001 ohm differences in order to determine if there are problems in the windings.

Any recommendations out there on milliohm meters? Are the $400 units okay, or do I need to spend several thousand?

Steve G. in MD

Top Replies

vsluiter over 11 years ago +1

Another way to measure milliohms reliably is to use a normal lab power supply and a decent multimeter with millivolt range. If you are allowed to pump 1A DC through a winding, measuring the voltage over…
mcb1 over 11 years ago in reply to ravi_butani +1

All very useful ... but If I read correctly the intention was to check windings for a shorted turn.?? I turn shorted in 100, 200 or even 50 may not show any reading change, unless the motor had a previous…
nermash over 11 years ago +1

I fully agree that testing for shorted windings with a miliohm meter is not the best thing to do. I believe that there are some testers around for that purpose, probably based on the "ringer" type used…

Parents

0 philb6502 over 11 years ago

Hi Steve,
My Hameg 'scope has a "component tester" function for testing Semiconductors etc.
It may be worth trying a component tester on the winding with a shorted turn...Comparing it to a winding that you know works.
This would be more likely to work with windings with a higher DC resistance.
philb
.
Cancel
Vote Up 0 Vote Down

Sign in to reply

Verify Answer

Cancel

Reply

0 philb6502 over 11 years ago

Hi Steve,
My Hameg 'scope has a "component tester" function for testing Semiconductors etc.
It may be worth trying a component tester on the winding with a shorted turn...Comparing it to a winding that you know works.
This would be more likely to work with windings with a higher DC resistance.
philb
.
Cancel
Vote Up 0 Vote Down

Sign in to reply

Verify Answer

Cancel

Children

No Data