A look at the Uni-T UT210E

[Macbeth]

I believe this is a K-12 High School video on the subject (I'm from the UK and far to old to remember if K-12 would be 4th or 5th year secondary comp. science lessons)

[bitseeker]

I believe this is a K-12 High School video on the subject

I like how the square for Inaccurate & Imprecise has absolutely nothing in it, not even the target. Talk about a bad shot!

[mikga32]

Sent back...

Was shipping back more than the cost of the meter if you sent requesting Canada Post tracking/signature?

Send it back to Amazon.ca and was fully refunded, no shipping costs, That's was good at least.
It's not the sellers fault but factory fault box was sealed.

If I had got it from XXXX or XXIExpress to return shipping would be >$80 as it would need Full Tracking.
I got that info after receiving a plastic broken package (step downs with sharp heat sinks) with the package empty *MT
The seller did send them but in shipping plastic bag broke and that's all I got, empty bag even UPS store noted fact.
so paypal said send it back I did (semi tracked) and the seller sent the empty bag back to me (2 months later) and No Refund... Screwed twice, no product and shipping costs.

[dav]

After those "mods", is the UT211b (US$60) a still valid option?

[Ivan7enych]

Quick comparison of Uni-T UT210E signal output (blue trace) and Hantek CC 65 current probe (yellow trace).

Input signal is 100mA peak-to-peak rectangle (a 3.5V power source + 33om resistor + mosfet driven by function generator).

Hantek has much lower noise and better rise-fall time. UT210E can work up to 1-2KHz, Hantek CC 65 is usable up to 20KHz.

[Julius]

*SUCCESS*   Man, I like this UT210E so much more now with these mods.  It defaults to DC(v)(a), 6000 count, 3min backlight, 30min Power-off, full 6000 count 2A Dotless mode and NCV extra readings, WoW 

...

Just did a mod using your Arduino sketch and schematic. Worked beautifully!

Here's my backup (in case it would be useful for somebody):

Code: [Select]

...Before EEPROM Dump...
FF FF FF FF FF 00 80 E8 03 E8 03 FA 00 00 BE 03
70 17 98 08 BE 00 3D 3D 3C 3C FF FF 0A FF 40 FF
44 98 8A 81 64 00 96 00 00 80 17 80 FB 7E 38 75
4E 02 09 EF 01 09 01 FE 0A ED 15 0A F2 02 0A 00
00 01 00 01 00 07 98 00 64 00 64 00 64 00 00 00
82 89 B6 83 00 80 00 80 00 00 00 00 01 00 00 00
E3 7F 5B 7F 01 00 A9 2A 00 00 00 00 00 00 00 00
55 80 00 80 5C 80 E0 7C FA 05 00 00 00 00 00 00
00 00 00 00 00 00 00 17 00 00 00 19 1E 1B 04 07
00 00 00 00 00 00 00 16 00 00 00 18 00 1A 05 09
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0A
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0B
0D 00 02 30 0D 00 03 20 20 00 03 20 20 00 03 10
41 00 03 08 41 00 03 05 41 00 03 05 0D 00 02 30
00 80 00 80 00 80 00 80 00 80 F8 01 65 03 B8 04
FA 01 69 03 C5 04 00 80 5A C7 EF 0F 0F 80 00 00


...Flashing EEPROM...

...After EEPROM Dump...
FF FF FF FF FF 00 80 E8 03 E8 03 FA 00 00 BE 03
70 17 38 18 BE 00 FF FF FF FF FF FF FF FF 40 FF
44 98 8A 81 64 00 96 00 00 80 17 80 FB 7E 38 75
4E 02 09 EF 01 09 01 FE 0A ED 15 0A F2 02 0A 00
00 01 00 01 00 07 98 00 64 00 64 00 64 00 00 00
82 89 B6 83 00 80 82 89 00 00 00 00 01 00 00 00
E3 7F 5B 7F 01 00 A9 2A 00 00 00 00 00 00 00 00
55 80 00 80 5C 80 E0 7C FA 05 00 00 00 00 00 00
00 00 00 00 00 00 00 16 00 00 00 18 1E 1A 03 07
00 00 00 00 00 00 00 17 00 00 00 19 02 1B 04 09
00 00 00 00 00 00 00 1C 00 00 00 00 1D 00 05 0A
00 00 00 00 00 00 00 1D 00 00 00 00 00 00 06 0B
0D 00 02 30 0D 00 03 20 20 00 03 20 20 00 03 10
41 00 03 08 41 00 03 05 41 00 03 05 0D 00 02 30
00 80 00 80 00 80 00 80 00 80 F8 01 65 03 B8 04
FA 01 69 03 C5 04 00 80 5A C7 EF 1E B4 80 00 00


[eKretz]

I believe this is a K-12 High School video on the subject (I'm from the UK and far to old to remember if K-12 would be 4th or 5th year secondary comp. science lessons)

K-12 usually refers to a students entire primary and secondary schooling "career" if you will - from K (kindergarten) through 12th grade (senior in high school).

[joeqsmith]

John and Jesse, this was my first attempt.  As I mentioned, the first problem is in the clamp.    Jaw was glued but I was able to cut it apart with an X-acto knife and not damage the plastic too bad.  There are two sensors, one at each end.  Core is a little strange. 

[joeqsmith]

For a first attempt, things look promising.  Yep, that's a 300KHz wave from my 33120 driving the UT210E.   

[joeqsmith]

It will take some work to get things useable but I think it can be done.  Back to the network analyzer.

[joeqsmith]

CMOD11 was the data I took from the UT210E after I had added the driver and connector for the analog output.   The 3dB point was at 5.1KHz shown with the cursor.   You can see it's now fairly flat till about 10KHz, then it peaks about +3dB at 20KHz.   Once it settles down, things look decent.  Not bad for a swag.

[joeqsmith]

Took a second crack at it today and managed to tame it.  -3dB is now around 40KHz but I think I can do a little better with it. 

LeCroy showing the step response.
Channel 1 Yellow is the current monitor output from my driver.  This is buffered with a 33074. 
Channel 2 Red is the output from the UT210E.
Channel 3 Blue is the Tektronix P6042.  I had modified this probe to get close to 100MHz BW. 

The slow edge rates are the two fold.  Load is partly inductive and driver is fairly slow.   

[joeqsmith]

Started over and took another direction with it but results were not as good as I had hoped for.  The lack of space, low operating voltage, lack of available parts is not helping. 

[bitseeker]

It is quite an endeavor, Joe. All things considered, it's a cool tool to tinker with as well as for tinkering.

[joeqsmith]

My last attempt for today.  Looks like I took a big step backwards but this was a major rip up with no trimming.  I am starting to look towards 100KHz and things are looking fairly tame. 

[joeqsmith]

After some sleep, made one more change to the design and attempted to align it. 

Show again it the sweep to 500KHz but 5dB/div rather than 10.   

[joeqsmith]

The same setup looking at 0.2dB/div and sweeping to 100KHz.  Time to see if I can make a small PCB that will fit inside.

[Mitsch]

Hello,
I recently bought a UT210E - when I want to measure Amps DC I always have 200mA on the meter (without a wire in it).
Everytime I have to push the zero button - and after that I can measure correct DC amps.

Is there a trick to zero amps DC permanent?

Thank you very much in advance!

With kind regards,
Michael

[joeqsmith]

It's the nature of the DC clamp..    200mA does seem a bit high.   I've posted about how to trim the pots and degauss them if things get really bad to where you can't zero them.   Assuming the meter reads correctly as you sweep the current, I would just leave it.

[IanB]

It's the nature of the DC clamp..    200mA does seem a bit high.   I've posted about how to trim the pots and degauss them if things get really bad to where you can't zero them.   Assuming the meter reads correctly as you sweep the current, I would just leave it.

I did not follow exactly your previous notes on what the pots do. If you have more information on this, could you elaborate a little?

[joeqsmith]

    If you couldn't follow it, I doubt I could!     I remember those adjustments are like hair triggers, bump them and things go way out.    I'm planning to put a better video together for this meter and will go over how I aligned it.   

[Iwanushka]

Hello,
I recently bought a UT210E - when I want to measure Amps DC I always have 200mA on the meter (without a wire in it).
Everytime I have to push the zero button - and after that I can measure correct DC amps.

Is there a trick to zero amps DC permanent?

Thank you very much in advance!

With kind regards,
Michael

200ma is too much, try to degauss it, mine shows ~7ma and it almost does not change while rotating it in any way.

[joeqsmith]

[bitseeker]

Thanks for the new vid, Joe. That is a huuuge improvement. Amazing what you've been able to squeeze out of this meter.

[Ivan7enych]

Great improvement!
How did you made this? I saw a schematic in your video, and there was no bandwidth limiting capacitors in it, only standard instrumentation amplifier circuit.