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Old 04-03-2007, 05:43 PM
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KenB KenB is offline
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Default Megger MMC850 clamp-on meter

Heard about this from someone who attended the recent AFCOM conference (hey, where are the trip reports from those who went??). Megger has a new amp-clamp style meter that can measure an intact power cord -- no need to separate the wires. Dunno how it works, but it has a slick self-centering mechanism, which should certainly help reading accuracy and consistency. About $250.


If anyone gets a chance to try one, please let us know how it works.

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Old 04-04-2007, 08:57 PM
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Keith Keith is offline
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I am pretty sure that the switch and data location out here in VA has one of these on hand. I am in love with the concept quite honestly.

I may have to add one to my collection of tools soon.

Thanks for the link! I have been looking for this for a while.

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Old 10-02-2007, 07:43 AM
edison edison is offline
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We are also considering MMC850. We've been canvassing for few tools and it is on our top of our list.
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Old 10-25-2007, 09:06 PM
Rick Rick is offline
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Did you use the same Fluke meter to compare findings, or were multiple units used? I'm just wondering which unit is erroneous and thinking maybe something is out of calibration.
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Old 10-29-2007, 08:26 PM
Jeffrey404 Jeffrey404 is offline
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Actually have one of these as well. It is accurate to +/- 1%.
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Old 02-28-2013, 01:49 PM
ennisa ennisa is offline
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Been using this for about a year and I have been having some problems believing the readings on this device. I was looking around for reviews but can't find much. I am seeing a difference of about 50% between readings on this device and readings on dedicated single core CT meterers. It will often show an initial reading of (for example) 1.7 amps and then drop to 0.2 amps. When I know the reading should be around 0.5-0.6A. Now I am using it at the very low end for metering the usage on individual servers. To be honest I am very dissapointed with it. The manual say > 80% accuracy at 23 degrees C but I am not seeing that.

Anybody else having issues, or have a recommendation for a better unit that can do metering on multicore cables?

Originally Posted by hmsee1 View Post
We purchased three of the MMC850's and fielded them out to staff & electricians for evaluation. We compared the readings with a standard Fluke ammeter, with split or open power leads. Our results were not encouraging. We found that a large part of the time, the current readings were not on the mark.
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Old 10-26-2013, 07:14 AM
jackie15 jackie15 is offline
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Thank you for sharing great information to us.
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