Review: UNI-T UT61E digital multimeter

This is my first DMM review.

If anything is missing please say so and I will see if I can include it.

Woaahhhh!! Thanks a million for the DMM review!

It will take me *some* time to read it, and i will for sure get back to you on this. Just wanted to thank you already for the tremendous efforts. All of your reviews are highly appreciated!!

Thanks again HKJ! -- Hoping you get your hands on a free specimen of the i4 Intellichager!

Talk to you soon!

Awesome review, thanks for sharing and writing such a thorough review ! - The only thing I didn't see was the price.

EDIT: It's a shame about the lower-voltage issues....that pretty much precludes it from torch duty, IMHO.

my paypal deduction was 31.xx$

$)

Generally I do not like to include prices, because it depends on where in the world you live.

Not really, just get 0.1 ohm resistor and some short thick leads, then it will be a competent meter for flashlight current measurements. Use the resistor below 0.5A and the DMM with thick leads above 0.5A.

Sysmax has promised my one, but do not expect a review in the near future. When I receive it, the test will take at least two weeks!

I added a link to a larger version of the PCB in the DMM (Just click the picture of the PCB).

If anybody like access to this large picture, please say to. These is no reason to include it, if nobody uses it .

click works! i like the large picture :)

please leave the link (no delete). Very helpful!

looks like nice built quality!!

THANKS!

Given the weakness on current measurement are you aware of any meter for the same sort of money that would be better.

Don't need logging and already own an ancient and very battered Fluke 77(III).

Not really. I daily use I am using much more expensive meters (Fluke 179/189/289/8846A and MetraHit Energy), they do also have to be watched on the current ranges (But the are considerable better than UT61E). The best meter I have seen (For burden voltage) was a cheap meter with manual ranges and no fuses, but it did have other problems (That is no surprise).

I might review a few other DMM's, but I have not really decided it yet.

For truly GOOD current measurements, it's best to stop screwing around with regular DMM's at all. Get a current clamp meter - it has exactly ZERO burden voltage.

Even a really cheap current clamp meter will show MUCH more accurate real-world current measurements than any DMM with leads (thick or thin).
http://www.storeinfinity.com/mastech-ms2108a-4000-counts-ac-dc-current-clamp-meter.html

Personally, when I need a precise current measurement, I use an Agilent N2783B Current Clamp connected to an Agilent MSO7054B Oscilloscope, but that's way overkill for LED type current measurements. The <$40 current clamp above is more than adequate. Either way, measuring current with a leaded DMM or the voltage accross a shunt resistor (0.1 OHMS gives a 1 Volt burden voltage at 10Amps) is a very bad way to get real-world measurements from a system like an LED torch.

Damn fine review of that DMM though - for the (incredibly low) price, it's a nice unit. I love my Hioki 3801-50, but it's nowhere near that price point, and it's not "better enough" to justify the additional cost for the types of measurements necessary in our hobby. Even it sucks for current measurement because there is no such thing as a zero-burden leaded DMM in current mode.

PPtk

That is not correct. A current clamp is fine when measuring a couple of amps and up, but try measuring 10mA with a current clamp, where few can do that with any precision.

The 0.1 ohm resistor was not meant for 10A, only for below 1A. I do also say that in the review (It is in the mA range description).

I measure a couple of uA with a current clamp on a regular basis - Imon current on laser diodes. Just a pF of capacitance from a scope probe on these signals is more than enough to screw everything up. At this incredibly low level, the signal isn't terribly accurate, but its very repeatable and precise measurement to measurement. The current clamp I use is guaranteed accurate to 1% at anything over 10mA.

Agreed, I see that now. And yes, for measurements in the mA range, a shunt resistor is not a bad way to go - limited voltage drop at those levels.

Once again, really nice job on the review of the DMM. It really is a pretty nice unit for the cost.

PPtk

HKJ,

You mentioned the model has no back light, have you tried press and hold the yellow button? My cheaper UT61A has back light LCD.

I also found out that despite my model does not come with temperature measurement but if I were to turn the dial somewhere in between say mA and uA, I get temperature (most likely ambiance) reading!

Excellent detailed review HKJ. Thanks very much! Sticky'd.

Nice review, thanks. OK a clamp meter is new to me. I had to YouTube it. How do you measure a flashlights current using one?

What was the price of that clamp?


The manual explicit states that it has no backlight (and the switch does not work either).

HKJ, you made my day. Thanks

If memory serves, about $4000. It was added to the lab a long time ago though, so I might be off by a bit - my memory for unimportant things isn't very long..

PPtk

Nice review! I may have to grab one of these. Didn't know these were so darn cheap! I've got a pricey Agilent datalogging DMM, but could use one for basic voltage logging.

It's funny that the unit you reviewed seems more accurate than the more expensive UNI-T-UT70B (although this model has the temperature feature).