Amprobe AM-240 vs. Extech MN36 - Page 1
Forum section: electronics / testgear

author: helloworld922
author_rank: Regular Contributor
timestamp: December 12, 2012, 08:06:50 pm
content: So I'm thinking of getting a relatively cheap multi-meter that's still functional. I watched Dave's $50 Multimeter Shootout video which reviews the AM-220 which is very similar to the AM-240, which as far as I can tell the only difference is that the AM-240 has temperature capabilities.I also found the Extech MN-36 which appears to be similar to the Extech EX330 Dave reviewed, though there are a variety of differences:1. No Non-contact voltage detector2. CAT-II 600V rating instead of CAT-III 600V3. Max Frequency measurement of 5 MHz instead of 40 MHz4. Max capacitance measurement of 100uF instead of 200uF5. Slightly smaller/lighterI am able to get either of these meters for around the $35 range (Amazon: Extech MN-36,Zorotools: AmProbe AM-240)What I intend to do:1. Mostly home hobby-level electronics, I'm usually interested in battery powered or low-voltage type electronics work. Very rarely I might work with mains (120V), though I don't have any plans to do so in the near future. I love sensors and mechatronic-type circuits2. The K-Type thermocouple (or other built-in temperature sensor) is a must.Any suggestions on which of these two probes I should go with? Personally I'm leaning towards the MN-36 because it does have 1 pF capacitance resolution vs. the 10pF resolution of the AM-240, but there datasheet/manual does not specify any tolerances at this range.Oh, and FYI I also found theExtech EX430for $55, which is currently outside my the price range but does have true RMS and a bunch of other goodies.

author: retiredcaps
author_rank: Super Contributor
timestamp: December 12, 2012, 11:41:35 pm
content: Quote from: helloworld922 on December 12, 2012, 08:06:50 pmI only comment on what I have used or own and even then my experiences with a sample size of one may not be representative.The Extech 430 overshoots on all readings. A lot. For example, when measuring a simple 9V DC battery, it will display 18.11, then 9.01, then 9.00, then 8.99. This takes about 1 to 2 seconds before a stable reading is found.I'm not sure if I'm explaining this correctly, but the Extech 430 AC V mode also goes crazy/fluctuates wildly and never stops in presence of > 10V DC.Again, your experience may differ from mine.

author: FenderBender
author_rank: Super Contributor
timestamp: December 13, 2012, 02:09:10 am
content: I have an AM-220. It's a solid meter. It won't give you any trouble.Can't speak for the Extechs. I don't have any. But the AM-220 is a good cheap meter. Probably a little overpriced, but not too bad.I haven't compared this meter with any others, but the AM-510 might be worth a shot:http://www.amazon.com/Amprobe-AM-510-Commercial-Residential-Non-Contact/dp/B007FZFTZO/ref=sr_1_1?s=hi&ie=UTF8&qid=1355364664&sr=1-1&keywords=amprobe+am-510

author: helloworld922
author_rank: Regular Contributor
timestamp: December 13, 2012, 05:44:28 am
content: QuoteYeah, I noticed Dave's review of the EX330 had similar problems with overshoot, I suspect I might end up with the same problem if I choose an Extech.QuoteNot a bad looking meter, though I really want a meter with temperature measurement capabilities so I might consider theAM-520.Comparing a few of the AM-520 specs with the AM-240:1. AM-520 can measure up to the 1kV range vs. 600V for the AM-2402. AM-240 has 0.5A/250V and 10A/250V fuses while AM-520 is spec'd with 0.5A/1000V and 11A/1000V fast fuses.3. Better temperature resolution for the AM-520 (0.1C vs. 1C), [-40C,1000C] range for AM-520, [-50C, 700C] range for the AM-240, better accuracy for the AM-5204. Separate mA/uA and V jacks for the AM-5205. AM-520 has a non-contact voltage detector6. AM-520 has a flashlight on it (not just a backlight, an actual flashlight)7. AM-520 comes with a velco strap8. The AM-520 supposedly has some sort of bar-graph display for fast changing signals9. AM-240 can measure duty cycle, I don't think the AM-520 has this capability10. The AM-520 uses a 9V battery, while the AM-240 uses 2 AA batteries.As far as price goes, the AM-520 is about $5 more expensive than the AM-240 so it's pretty tempting.

author: FenderBender
author_rank: Super Contributor
timestamp: December 13, 2012, 11:11:39 pm
content: It's a pretty good meter for the price. That's where Amprobe succeeds. Not always the absolute best for electronics work, but it's a good value.

author: dr_p
author_rank: Frequent Contributor
timestamp: December 14, 2012, 12:44:11 pm
content: The AM-530 got a teardown right here:https://www.eevblog.com/forum/reviews/amprobe-am-530-a-peek-under-the-hood/msg164418/#msg164418