megger that motor

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zog said:
Krim,

That all depends on what your intended use is, I own 4 Meggers that I use for different applications, OK I only use 3 of them one I just keep around for sentimential reasons.
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zog, I'm not quite sure what company made the best megger that I'd used back when I first used one but it was a yellow color similar to the Flukes, it could have been a Beckman , B & K, can't recall. Any way I do recall that it was a handheld size , had 3 leads with a digital display and hold feature for the readings. It wasn't a complicated piece of equipment to use and I would always grab that particular megger whenever I needed one for a service call. That was back about 8 years ago. Just about a year ago, since getting back into the electrical trade, I visited that old company hoping someone could remember the model & manufacturer of it.
Unfortuneately knowone could, they told me that they presently only use the Fluke 1550B model exclusively. I checked it out but to me it's too bulky, too complicated and certainly for what I need one for too expensive.
I only need to occasionaly meg a motor or some wiring to check for shorts in motor housings and/or hidden conduits. I've seen quite a few that look very nice but when I find something with 3 or 4 leads the price really jumps up there. I'd like to find a 3 lead, digital display, preferably battery powered that is good for 100 to 1000 VAC range. The max I probably need is up to 500 VAC but I figured if I can find one up to 1000 at a decent price (under 1K preferably) that would be ideal for me. The company is currently operating under a budget deficit and so if I want any new equipment I'd most likely have to purchase it myself & use it as a write-off on my taxes.

Carl
 
I use a fluke (mod # escapes me now). also when checking the windings,spin the shaft slow, incase of flat spots else where.
Amp, ingeneral, check for balance and match with name plate.
 
zog said:
Sounds like this would be the best for you

http://www.megger.com/us/products/ProductDetails.php?ID=800&Description=

You can find a ton of these similar models on ebay
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I check out ebay about 2 or 3 times a week just browsing for different items on my personal wish list . I've used the "Buy It Now" feature a few times , some prices are unbelievably low, but s & h fees from some sellers' are outrageous you've really gotta watch out .
 
How about the megger??

How about the megger??

OK, I'll probably get blasted for interjecting something so obvious here, but no one has mentioned it so far.

My boss taught me to ALWAYS test the megger before using it. The "test" consisted of simply connecting + and - together to make sure megger would indicate a short. I guess it was always good insurance to make sure your readings were valid.

RLK :smile:
 
rkrieger said:
OK, I'll probably get blasted for interjecting something so obvious here, but no one has mentioned it so far.

My boss taught me to ALWAYS test the megger before using it. The "test" consisted of simply connecting + and - together to make sure megger would indicate a short. I guess it was always good insurance to make sure your readings were valid.

RLK :smile:
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its always a good idea to test your equipment before you use it. i tell my helpers to always test before they touch. a helper blew up my pliers because he thought a romex cable was dead before he cut it :(
 
rkrieger said:
OK, I'll probably get blasted for interjecting something so obvious here, but no one has mentioned it so far.

My boss taught me to ALWAYS test the megger before using it. The "test" consisted of simply connecting + and - together to make sure megger would indicate a short. I guess it was always good insurance to make sure your readings were valid.

RLK :smile:
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RLK , Don't tell me that isn't a standard protocol. I would have simply taken that pre-use test for granted, meaning I wouldn't think anyone that uses a megger would use it without testing it first. It's kinda like grabbing a flashlight to go into a dark place & having not checked first that the bulb and batteries were in good operable condition. A no brainer type of situation.
Carl
 
Pierre C Belarge said:
How do you test with a megger for hidden conduits?
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I said ... "check for shorts in motor housings and/or hidden conduits ".
Meaning that I've used one for basically continuity testing for shorted wiring within conduits inside of walls such as cinder block walls.
Picky, picky. I never was real good in writing class Pierre. :grin:

Carl :rolleyes:
 
Krim said:
I said ... "check for shorts in motor housings and/or hidden conduits ".
Meaning that I've used one for basically continuity testing for shorted wiring within conduits inside of walls such as cinder block walls.
Picky, picky. I never was real good in writing class Pierre. :grin:

Carl :rolleyes:
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...and I was not great at reading class. :grin:
 
Krim said:
Speaking of Meggers'...
What type do you use ? Is it a 2 or 3 lead type ? Crank or battery powered ? How long have you had this particular model and would you buy the same or most similar to model again ? If not what features would you prefer in a replacement megger ?

Carl
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We have a 3 lead megger hand cranked type. I would prefer a battery powered unit to effectivley perform a dielectric absorption ratio test. If the ratio is a 10 min. reading divided by one min. reading this value is refered to as a polorization index, which gives a better indication of the condition of the motor.
 
jonni said:
We have a 3 lead megger hand cranked type. I would prefer a battery powered unit to effectivley perform a dielectric absorption ratio test. If the ratio is a 10 min. reading divided by one min. reading this value is refered to as a polorization index, which gives a better indication of the condition of the motor.
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Thanks jonni , what manufacturer name is on your megger ?
I too prefer the battery powered over the hand crank, but some of these require so many batteries 6 plus on some. I'd like one that only uses 1 or 2 9 volter's max.The digital display models that show the scale typical of the analog models are nice too.
Carl
 
Krim said:
Thanks jonni , what manufacturer name is on your megger ?
I too prefer the battery powered over the hand crank, but some of these require so many batteries 6 plus on some. I'd like one that only uses 1 or 2 9 volter's max.The digital display models that show the scale typical of the analog models are nice too.
Carl
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I believe some are manufactured to be plugged in - for the longer testing procedures some are performing.
 
Pierre C Belarge said:
I believe some are manufactured to be plugged in - for the longer testing procedures some are performing.
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You're quite right Pierre some are plug in models.
Are you stalking me Pierre :confused: or just bored enough to follow me around the forum :grin: .
Just joking of course ... I watch you too ;) you have a way of stirring things up enough to make for some interesting reading .

Carl :)
 
Krim said:
Thanks jonni , what manufacturer name is on your megger ?
I too prefer the battery powered over the hand crank, but some of these require so many batteries 6 plus on some. I'd like one that only uses 1 or 2 9 volter's max.The digital display models that show the scale typical of the analog models are nice too.
Carl
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Fluke 1520 and 1507:)
 
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