Megger question?

[sii]

Are there any sites out there (preferably some thing not brand-specific) that would be a good place to learn about proper and safe use of a megger? I have finally convinced my boss to but one but am now unsure exactly what I need.

Also, my local supply house recommended this one:
http://www.idealindustries.com/prodDetail.do?prodId=61-795&div=1&l1=insulation_earth_testers

and this one:
http://www.mygreenlee.com/GreenleeDotCom/Products/main.shtml?greenlee_category_id=6&product_category=163&adodb_next_page=1&portalProcess_2=showGreenleeProductTemplate&upc_number=07665

We would use it mostly for testing 480 volt motors and occasionally branch circuit wiring. There is a heck of a difference in price, would the Ideal one do the trick or do we need something bigger?

Thanks.

 

[cadpoint]

We would use it mostly for testing 480 volt motors and occasionally branch circuit wiring. There is a heck of a difference in price, would the Ideal one do the trick or do we need something bigger?

From this Forum, and this member's thread

If you don't beleive me, use advance Search, megger and his name!

Have an nice read and enjoy the weekend...

 

[Bowen]

We use a Hioki brand 1000V digiatal and it does the job just fine, and they are not very expensive.

 

[Charlie Bob]

I bought me a Fluke 1587. Which is a DDM with a 50,100,250,500 and 1000 v test capability. I got the troubleshooting kid, with amp clamps and more for about $545.00 on Ebay.(about $400.00 cheaper!!!) I love it.

 

[480sparky]

Required reading:

Stitch in Time.

It's required reading.




Did I mention it's required reading?

 

[SEO]

I got the troubleshooting kid, QUOTE]

Is he any good?:grin: I make more typing and spelling mistakes than anyone I shouldn't pick on anyone.

 

[Charlie Bob]

As a matter of fact, He is. He does all my troubleshooting and megger testing.
Good one SEO,LOL.:grin:

 

[zog]

Are there any sites out there (preferably some thing not brand-specific) that would be a good place to learn about proper and safe use of a megger? I have finally convinced my boss to but one but am now unsure exactly what I need.

Also, my local supply house recommended this one:
http://www.idealindustries.com/prodDetail.do?prodId=61-795&div=1&l1=insulation_earth_testers

and this one:
http://www.mygreenlee.com/GreenleeDotCom/Products/main.shtml?greenlee_category_id=6&product_category=163&adodb_next_page=1&portalProcess_2=showGreenleeProductTemplate&upc_number=07665

We would use it mostly for testing 480 volt motors and occasionally branch circuit wiring. There is a heck of a difference in price, would the Ideal one do the trick or do we need something bigger?

Thanks.

the Ideal is a piece of junk, not as bad as the above mentioned Hioki but not suitable for motor testing. You will want a 1000V unit with PI and DAR modes for motor testing. If you test a lot of motors in a day you will want one with data storage and reporting software.

Megger and AEMC both make a good unit for your needs. For Megger I recommend the MIT400 http://www.megger.com/us/products/ProductDetails.php?ID=800&Description=

For AEMC the the 1050 is a great unit I use myself for LV testing, the case is about industrutcable and the display is very easy to read and trend. http://www.aemc.com/

The Fluke 1587 seems to be popular for some reason, not sure why, it seems OK for simple testing but I would nto recomend it for motors, but I suppose it a cheap alternative.

As 480 said, "A stich in time" is a good place to start. And for motor testing, don't forget the most important thing, tempature correction, your readings are meaningless if you do not tempature correct and you will be wasting your time doing the test at all.

 

[76nemo]

The 1587 is a very well rounded DMM, but not capable of PI/DAR intention. While the 1587 has a low-pass feature for ASD's, the 1587 serves as a "go,.. no go" in 50-1000V applications. Do you want a tester strictly for this function??? The 1507 may be a better choice for you. The 1507 calculates PI/DAR for you. PI/DAR are much better served in PM applications.

 

[mxstar211]

Do a google search for insulation resistance testing and you will find tons of information. For my line of work we use 15 kv and 5 kV Meggers, but about 2-3 months ago I picked up a used Megger MIT 400 for $150 on ebay. I haven't had a chance to use it, but it seems like it will work pretty good for what you need. I think they retail for $500-$600. Definately go to Megger's site and they have "A Stitch in Time" available in PDF for free download. I actually have to give my unit a class on insulation resistance testing this month, so I know you can find tons of info on the internet.

Not sure if you heard, but "A Stitch in Time" is definately worth reading.

 

[wptski]

the Ideal is a piece of junk, not as bad as the above mentioned Hioki but not suitable for motor testing. You will want a 1000V unit with PI and DAR modes for motor testing. If you test a lot of motors in a day you will want one with data storage and reporting software.

Megger and AEMC both make a good unit for your needs. For Megger I recommend the MIT400 http://www.megger.com/us/products/ProductDetails.php?ID=800&Description=

For AEMC the the 1050 is a great unit I use myself for LV testing, the case is about industrutcable and the display is very easy to read and trend. http://www.aemc.com/

The Fluke 1587 seems to be popular for some reason, not sure why, it seems OK for simple testing but I would nto recomend it for motors, but I suppose it a cheap alternative.

As 480 said, "A stich in time" is a good place to start. And for motor testing, don't forget the most important thing, tempature correction, your readings are meaningless if you do not tempature correct and you will be wasting your time doing the test at all.

Do you use a AEMC 1050 or 1060? The 1060 has the PC connection.

 

[brian john]

I will no longer purchase Megger/AVO MIT meggers ALL I have owned broke or never functioned properly.

Just not putting out the product they once were. Just my experience and opinion. Unless you have money to throw away, I would look at other manufactures.