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| A look at the Uni-T UT210E |
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| Mortymore:
--- Quote from: 1001 on October 02, 2023, 08:21:15 pm ---New opamp in my UT210E, GS8334. --- End quote --- This is, or will be a trend, replacing known ICs with chinese ones. At least this Op-Amp has a datasheet in english. I recently repaired a device were the microcontroller reference was sanded and the other main parts were chinese, and for those I could find a datasheet, they were all in chinese. :palm: |
| RoGeorge:
Use Google Translate, it can translate text inside the .pdf files, too, except text inside bitmaps. Not perfect, but it might be just enough to make sense of the datasheet. |
| marce002:
Hi , i ve accidentally damaged the eprom chip, so found another around (24c0aN) and found a BIN file in the web in order to revive the unit. Of course it is working again with the new chip but the DC mode is offset around 4 A !!!... tried (maybe my mistake) to correct touching the pots ... now i have a messy unit (for this DC mode only) ... Question is , is there a VERY simple procedure to try to calibrate with an aceptable error (i can live with 200mah error!! for this unit) |
| RoGeorge:
Yes, there is a software (self)calibration procedure. So try to put the pots where they were, then run a software calibration (whenever you decide to mess with coils, trimmers and such, always mark the initial position before changing anything, I hope you did that :) ). You press something while turning it on, though I don't remember which buttons (first and last? - not sure), I've wrote the buttons on the paper user manual, and don't have the meter on hand right now :palm:, sorry. The procedure was written somewhere here, in these 35 pages thread at least a few times. There are 2 procedures, one that takes a couple of minutes and you have to keep 2 buttons? pressed while turning it on, and another that is just a zeroing (normal power then single press with the dedicated button while on DC amps). |
| marce002:
yes i did it of course (yello and blue while turning on) but does not end , shows "Err0" after some seconds displaying those weird numbers...the pots are back at at same place but i think still differs from the BIN file i have downloaded... so wanted to match them somehow... I have also found this procedure below very interesting!, can anyone tell me if this guy used a known value resistor connected to do the calibration process: Calibration must be done with caution. I am not responsible for any problems. Remember, remember, remember to put the turntable in the OFF position, press the blue (SELECT) key and the yellow (HOLD) key at the same time, and quickly rotate the turntable. Turn on the clamp meter to the Ω position until the CAL character is displayed on the screen. Release the blue and yellow keys. At this time, it has entered the calibration mode 1. After that, the machine will automatically check the internal circuit of the IC. The LCD will display the ADC code value. If there is an error, it will prompt Err0. ~4. At this time, turn off the machine and check whether the voltage dividing resistor for measurement is connected to see if there is a short circuit or open circuit, and whether the resistance value is correct. After the check is complete and there are no errors, restart the machine to start the calibration process. After the self-test is completed, the relevant parameters will be automatically saved to E2, the buzzer BEEP will sound once to indicate completion. If it has already been tested, press the SELECT key to skip this check. 2. Then automatically check the relevant parameters of the internal amplifier. After the self-test is completed, the relevant parameters will be automatically saved to E2, the buzzer BEEP beeps to indicate completion. If it has already been tested, press the SELECT key to skip this check. After pressing the select key twice to skip the above two self-test steps, the turntable must be rotated to other gears before the calibration is official. Start (this is very important) 3. Turn the turntable to the gear that needs to be calibrated, and perform calibration (it is recommended to calibrate the DC mV gear first)... During the calibration process, the function of pressing the blue (SELECT) key is " "Skip this step", short press the yellow (HOLD) key to subtract (-) the calibration value, long press the yellow (HOLD) key to add (+) the calibration value; if you want to exit the calibration mode, turn the dial to the OFF position." |
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