Roger Borg Posted February 1 Share Posted February 1 Picked this up recently. Have watched some YT videos, but wanted to ask here. To test windings insulation, probe to line and earth, set function to megger, dosl to x100, and one lead to metal fan body and other to one lead of motor? Crank. Then repeat to body and second lead? Crank. And then both leads? Crank. Also, what are the 4 numbered selectors at bottom? Thanks... Quote Link to comment Share on other sites More sharing options...
Mark Olson Posted February 1 Share Posted February 1 No need to connect both leads of megger to both leads of motor, that will tell you continuity, though. To meg a motor, one leg of megger to motor frame and the other leg of megger to motor lead. That gives you the insulation test. 1 Quote Link to comment Share on other sites More sharing options...
Roger Borg Posted February 2 Author Share Posted February 2 14 hours ago, Mark Olson said: No need to connect both leads of megger to both leads of motor, that will tell you continuity, though. To meg a motor, one leg of megger to motor frame and the other leg of megger to motor lead. That gives you the insulation test. Hi Mark, thanks for tthe confirmation. Separate question, can the speed coil insulation be tested in a similar way? Quote Link to comment Share on other sites More sharing options...
David Allen Posted February 2 Share Posted February 2 That is a very nice unit. In addition to insulation resistance (traditional Megger testing) this one has a Wheatstone bridge for Varley loop testing. This test will allow you to analyze underground power cables and calculate how many feet from the cable end a short circuit or ground fault is located. Saves digging time if you need to locate a buried fault. Quote Link to comment Share on other sites More sharing options...
Roger Borg Posted February 2 Author Share Posted February 2 1 hour ago, David Allen said: That is a very nice unit. In addition to insulation resistance (traditional Megger testing) this one has a Wheatstone bridge for Varley loop testing. This test will allow you to analyze underground power cables and calculate how many feet from the cable end a short circuit or ground fault is located. Saves digging time if you need to locate a buried fault. Original owner used for ham radio stuff. He explained they would bury antennas in the ground, and then compare measurements of antenna vs ground measurements. He was the original owner, his friend worked at the plant in Philly. Do you have any thoughts on the 4 numbered dials at bottom? 1 Quote Link to comment Share on other sites More sharing options...
Mark Olson Posted February 2 Share Posted February 2 6 hours ago, Roger Borg said: can the speed coil insulation be tested in a similar way? Yes Quote Link to comment Share on other sites More sharing options...
David Allen Posted February 2 Share Posted February 2 5 hours ago, Roger Borg said: Original owner used for ham radio stuff. He explained they would bury antennas in the ground, and then compare measurements of antenna vs ground measurements. He was the original owner, his friend worked at the plant in Philly. Do you have any thoughts on the 4 numbered dials at bottom? Those numbered dials are the resistance values you can dial in for the wheatstone bridge, if I am not mistaken. That would be used for the Varley function. Quote Link to comment Share on other sites More sharing options...
Roger Borg Posted February 2 Author Share Posted February 2 20 minutes ago, David Allen said: Those numbered dials are the resistance values you can dial in for the wheatstone bridge, if I am not mistaken. That would be used for the Varley function. Gotcha, so for my needs, not relevant. Thank you... 1 Quote Link to comment Share on other sites More sharing options...
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