Author Topic: Klein Tools MM200 Multimeter  (Read 6306 times)

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Offline FenderBender

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Klein Tools MM200 Multimeter
« on: January 30, 2012, 02:44:20 PM »
So I bought this meter for $49 at Home Depot. I really didn't know what I was going to get, but my curiosity was getting the best of me and needed another meter pronto.

So pros and cons...

Pros-

1.) Good feel to it
2.) Auto-ranging
3.) Decent looking (Agilent copiers *cough*)
4.) Lots of functionality (temperature, capacitance etc.)
5.) Reasonable internal build quality
6.) Excellent range switch
7.) Backlight
8.) Good test leads and included K-type thermocouple

Cons-

1.) It seems it was not properly calibrated from the factory (Edit: I have posted below showing you which potentiometers adjust what range.)
2.) Crap battery
3.) A little overpriced? (Still making up my mind)

EDIT: Sorry some of the photos are tilted. I might get to that later.
« Last Edit: October 28, 2012, 06:08:43 AM by FenderBender »

Online retiredcaps

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Re: Klein Tools MM200 Multimeter
« Reply #1 on: January 30, 2012, 04:16:29 PM »
1.) Inaccurate- I compared it to some of my other meters and it constantly reads low. So if my other 3 meters read a 9V battery as 8.45V, it measured around 8.2-8.3V. I tested it on many different voltage sources

Thanks for sharing.  I'm always interested in seeing what the insides look like.

My method is far from scientific and I don't have any fancy  power equipment and/or calibration, but I recently gathered up my 3 multimeters and hooked them up to an ATX power supply and had each measure the 12V and 5V DC via the molex connector simultaneously.

Maybe try the same for the above and then you can see the differences more clearly.  If the Klein is that far off, I think I see possible adjustments on your board? 

If this were my multimeter and I couldn't adjust it, I would return it for money back.
« Last Edit: January 30, 2012, 04:19:54 PM by retiredcaps »

Offline ron

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Re: Klein Tools MM200 Multimeter
« Reply #2 on: January 30, 2012, 05:12:42 PM »
Having mA & uA on the same terminal as V and ohm is asking for trouble imho.

Offline JuKu

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Re: Klein Tools MM200 Multimeter
« Reply #3 on: January 30, 2012, 06:29:08 PM »
A meter that doesn't give accurate numbers doesn't fulfill its purpose of existence.

Offline cybergibbons

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Re: Klein Tools MM200 Multimeter
« Reply #4 on: January 30, 2012, 07:26:01 PM »
Having mA & uA on the same terminal as V and ohm is asking for trouble imho.

Yep, keep a load of the little fuses spare for when you turn the dial to the wrong position.

Offline FenderBender

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Re: Klein Tools MM200 Multimeter
« Reply #5 on: January 31, 2012, 07:45:51 AM »
A meter that doesn't give accurate numbers doesn't fulfill its purpose of existence.

Yeah I know. I contacted Klein looking for calibration data because I'm POed. Manual states 0.5% for voltage DC. I think it's atleast 1-1.5% off in a few of the cases I tested.

Offline FenderBender

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Re: Klein Tools MM200 Multimeter
« Reply #6 on: February 17, 2012, 10:55:26 AM »
So of course Klein said they'd pass my request onto the Meter team, but the so called meter team does not seem to want to talk to me...so I did my own investigation.

So I figured out the function of two of the many potentiometers on this meter's board. I have a picture attached.

--> The one in the purple box is for adjusting the voltage measurement. I believe only for DC voltage.

--> The one in the yellow box is for adjusting capacitance measurement.

Both of these were out of spec on my meter.  I did not use a precision reference, however I did have 3 meters reading very close to each other and the Klein way far off. For capacitance, my meter was roughly 6% off my "accepted value". The spec was supposed to be +/- 3%. For voltage, I was getting around 1.3% out on a 9V battery (measuring 8.90V on other 3 meters), as a reference. Spec was +/- 0.5%

Again, please don't criticize my ghetto calibration here.

However, if anyone else needs to calibrate their own, I know for a fact what those two pots do. Also, if you just look at the board, you can probably tell what the others might do.


« Last Edit: February 17, 2012, 11:14:58 AM by FenderBender »

Offline IanB

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Re: Klein Tools MM200 Multimeter
« Reply #7 on: February 17, 2012, 02:02:13 PM »
These meters with adjustable pots are very convenient. Usually they seem to be scale adjustments and may need the lightest of touches. You adjust to get a good reading at some known reference point, then check against a few other points on the scale. If all seems good you are done. Otherwise the scale might have some non-linearity and you may need to adjust one point a little high to balance out another point reading a little low.
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Offline FenderBender

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Re: Klein Tools MM200 Multimeter
« Reply #8 on: February 17, 2012, 02:08:58 PM »
These meters with adjustable pots are very convenient. Usually they seem to be scale adjustments and may need the lightest of touches. You adjust to get a good reading at some known reference point, then check against a few other points on the scale. If all seems good you are done. Otherwise the scale might have some non-linearity and you may need to adjust one point a little high to balance out another point reading a little low.

Yeah I didn't really do too many points. I did think about that: Non-linearity.

I might check a few more voltages/capacitances and see if anything shows up undesirable.

And these pots are very touchy. They're single turn SMD pots. Pretty much suck, but hey a machine does it I think anyway.

alm

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Re: Klein Tools MM200 Multimeter
« Reply #9 on: February 19, 2012, 06:18:23 AM »
And these pots are very touchy. They're single turn SMD pots. Pretty much suck, but hey a machine does it I think anyway.
I'm not so sure. Machines are the reason why pretty much all manufacturers use closed case calibration these days. The only manufacturers still using them are the low-end manufacturers from countries with cheap labor. Guess how likely they are to invest in sophisticated equipment versus some unskilled laborer adjusting the trimmers to a dubious voltage reference (eg. a battery which may become empty at some point) 16 hours per day.

Offline FenderBender

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Re: Klein Tools MM200 Multimeter
« Reply #10 on: February 19, 2012, 07:45:05 AM »
Well I always heard that those type of trimmers were intended for a machine to adjust. Though perhaps you are saying through software?

Who knows.

Offline thedougler604

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Re: Klein Tools MM200 Multimeter
« Reply #11 on: June 09, 2013, 07:34:49 AM »
I bought one of these today, and it's set to work in fahrenheit.  I can see that the LCD has a degrees C light on it, but I can't figure out how to get it there?  I've emailed and called Klein, but they're closed today. 

Does anyone know how to set the temperature unit on their mm200?

Offline saturation

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Re: Klein Tools MM200 Multimeter
« Reply #12 on: June 09, 2013, 11:13:06 PM »
It seems decently made; its also ETL listed for safety, and the casing is double walled in addition to the rubberized sleeve.  So the only issue is accuracy, precision and features.
Best Wishes,


Saturation

Offline iloveelectronics

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Re: Klein Tools MM200 Multimeter
« Reply #13 on: June 09, 2013, 11:23:05 PM »
It's almost identical to the Mastech MS8233E I looked at a while ago: http://www.eevblog.com/forum/testgear/mastech-ms-8233e-ms-8240d-and-ms-8250c/msg160990/#msg160990

Only differences are that the MS8233E has the NCV detection and a MAX functions, while lacking the frequency measurement that the MM200 has.
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