UNI-T UT210D/UT201E Digital Clamp Meter True RMS Voltage Resistance Capacitance Multimeter Temperature Measure Auto Range Electrical (ABS)

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One this side is another string of resistors (R27A, R27B, R27C: 3x300kohm), but strange enough they are connected directly to the input terminal without any protection. The NCV voltage led (LED3) and the transistor to drive it (Q2) is also placed here.

I recorded video of process of resetting to zero of the current indications in the DC mode at UT210E. This method allows to reduce residual indications in the mode of measurement of a direct current (DC 2A Dotless, 2A,20A,100A) without the need for EEPROM correction without the programmator. Thanks of kDnZP from a Russian-speaking forum! Screen update rate is unusually fast for Uni-T at around 4 updates per second. Unfortunately, other things are slow: the latched continuity tester is usable, but certainly not fast. Resistance autoranging is slow. Reading current with the clamp is also a tad slow, it usually a second or two for the value to come up to the right area, and then 2-3 seconds more for the last digit to stabilize, so current isn't instant. A full set of teardown pictures are here. https://photos.google.com/share/AF1QipPykJgrz2vMySXTkFdst6YsfoTs0Mzs1vmWZXa-XQ5EGBxVeRmFiqj-jO2c44IFcA?key=T01ITXVCa015U0x5WV9UZUV6dUdiSGdXUTBENF93Taking a brand new, virgin UT210E and placing it on the bench with no current I measured 14mA of drift after 10 minutes and 19mA after 20 minutes. This probe is no worse that the one I used for the first test. What has changed is it is in a room with air conditioning and it is cycling! Changing the PROM will not impact the drift.I suspect you could run 100 of them an they would all drift roughly the same.I suspect you two main problem will be temperature and placement.When Maxlor posted 10mA in a minute, I can believe it.When I ran that test I was careful to try and hold the temperature as tight as possible and not move the clamp. The NCV function is also quality. It's extremely sensitive and goes off immediately from about 4" from a power source. Zero: Save the current measurement and show the following measurements relative to that value (Very important for DC clamps).

When I get a spare moment, I’m going to solder a couple of wires on to the thing and see if my hunch is correct. If so, this will be the cheapest 6000 count meter with RS232 (some soldering required) on the market. :¬) They only work with high currents. The lowest range on many devices is 20A or 40A, which gives you 10mA resolution. Connect and fasten the SOP8-DIP8 board to the CH341A programmer. The SOP8-DIP8 board pin 1 should be farthest from the USB connector and adjacent to the fastener so as to align with the 24CXX DIP8 outline on the programmer. To produce the modified EEPROM image, an original EEPROM image is necessary because there is device-specific calibration data contained in the image. An example original EEPROM image is included at bin/orig.bin, as well as its default modified image as produced by make at bin/mod.bin.So my question is is this typical behavior for the meter, or should I exchange it for another? What do others see?

There is a voltage clamp made with two transistors (Q4, Q9), it is not directly connected to input or output resistors but is probably switched in depending on range. Connect the SOIC8 test clip cable to the SOP8-DIP8 board. The red wire should be connected to pin 1. Velmi šikovný malý "klešťáček" pohodlné ovládání všech prvků jednou rukou, kolečko jde lehce a přesně bez "přeskoků", dostatečně velký displej s podsvícením a velmi dobrou čitelností ze všech úhlů. Měří docela precizně, (ten můj má dokonce mnohem lepší tolerance, než uvádí výrobce) super vychytávka jsou tři rozsahy měření proudu, "pípák" reaguje celkem rychle, stejně tak i automat při přepínání rozsahů. Jedinou maličkou chybičkou jsou výrobcem dodávané měřící kabely, sice nejsou už tak tvrdé jako je běžné u těchto levných měřáků, naopak, jsou ohebné tak akorát a nemají tendenci se zamotávat, ale jsou z nějakého měkčeného plastu, a ne příliš teplu odolné, koncovky mají zahnuté o 90° což je k této konstrukci měřáku se spodními vývody naprosto nevhodné, niklované hroty tomu taky nepřidají a miniaturní gripy působí velmi nejistě. Ale protože používám jiné měřící kabely, musím říct, že měřák jako takový je velmi povedený a za ty peníze přináší opravdu hodně "muziky".

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This meter is nice for measuring 100's of mA or more without any voltage drop, using it for lower DC currents requires careful use of the zero button.

In voltage mode, you get no overshoot, but usually have to wait 0.5-1 second to get a reading because of the autoranging (which you can't disable). It shows you ---- while it's doing that, and then gives you a stable value, I like that. The big IC (DM1106EN) is the main multimeter chip and the frontend for the clamp is mounted close to it (U4:OPA4330 Quad OpAmp).

Narrowed it down to two, UNI-T UT210D and the UNI-T UT204, just want to see if other guys have brought. The CH341A flash programmer is connected to the computer via USB and to the UT210E EEPROM via SOIC8 test clip cable. Once connected, ch341eeprom[3] can read and write the binary flash EEPROM image.