Products > Test Equipment
A look at the Uni-T UT210E
d.bocc:
Update about missing caps:
According to Tony Zhou <support02@uni-trend.com.cn>
Hello friend,
This unit is normal.
Best Regards,
UNI-TREND TECHNOLOGY (CHINA) CO., LTD
ThunderZed:
What's its minimum detectable AC value? I mean the value based on your real experiences, not based on specs, better if in comparison with other more accurate instruments/gauges to see how "effective" is its lowest detected value :)
Neutrion:
--- Quote from: marlonpnz on January 22, 2021, 05:37:53 pm ---Hi folks.
I would like to share a method I discovered to calibrate without need to read and write the flash memory.
Sorry if it is not new fou you, but I searched for it and did not found the procedure explained like this.
1-Simply hold pressed the HOLD+SELECT buttons while you turn on the meter to the ohms/continuity/diode option (second position). Then release the buttons.
I am not sure if this wheel position is really mandatory, but it is described in some places as the correct method.
The meter will show "CAL" and will do some auto tests. You can abort this tests pressing select 2 times. If you let it run over, it will end the auto-tests after some minutes.
(note: after change the count config to reach 6200 counts the aut-test take much more time, then I gave up waiting).
2-Now put in the function/scale you want to calibrate (rotate the wheel and press select until you reach there), can be DCV for example.
I tested only for DCV (all ranges) and DCA (all ranges) but most probably it will work for others, like ohms and capacitance. The ACV seams to share the calibration of DCV. I did not tested ACA.
3- Now comes the main part (apparently undocumented). While you are in whatever function you chose before, you can calibrate the zero point by pressing the ZERO button (once per function/scale calibration procedure) and the gain by pressing the HOLD button (short press to decrease the reading and long press to increase the reading). However, to do so you need to feed the leads with a known integer value, once each press in HOLD will jump the reading to next integer above(long press) or below(short press). So, for example if you feed 12.00Vdc but you read 11.82Vdc, than long press HOLD while you are sure the correct voltage is 12.00Vdc and the meter will adjust the reading to 12.00Vdc (first integer above 11.8V).
-Therefore, each long press will jump the reading to next integer above, while the short press will make jump to the next integer below.
-Depending the scale you are the jump may not be an integer, however you will figure it out while doing the process.
-Pay attention to the scale you are. As DCV is autoscale you need to adjust when you are at 0.000, when you are 00.00 and when you are 000.0. You need to change the scale by changing your voltage source. The point in each range to calibrate is a personal choice. I noticed that the linearity is not so good, than I prefered to calibrate at 17.00Vdc the 60Vdc range once I will be reading values mainly from my battery bank between 12 and 24Vdc.
4-After the procedure for all functions and scales you are interested to calibrate just turn off the meter. In the next turn on the new calibration is used normally.
In the attachment you can see my flash content before(left) and after(right) calibration. Differences are highlighted. I calibrated DCV and DCA only (all ranges).
It seems that some different memory positions were changed compared to the documented positions (devydd post). My meter use the DTM0660 chip.
--- End quote ---
Did anyone else verify this method? There are some docs and blogs suggesting NOT to do it. Why?
radiolistener:
--- Quote from: ThunderZed on October 14, 2021, 10:40:29 am ---What's its minimum detectable AC value? I mean the value based on your real experiences, not based on specs, better if in comparison with other more accurate instruments/gauges to see how "effective" is its lowest detected value :)
--- End quote ---
just tested it at 50 Hz. The test setup is PSG9080 sig gen, BM867S dmm and RF grade 49.85 Ω dummy load (FLORIDA RF 32A1213F C0C).
The first value is measured RMS voltage on dummy load.
The second value is calculated RMS current through dummy load.
The third value is UT210E current reading on 2A range.
0.100 Vrms / 0.0020 Amps => 0.000 Amps
0.200 Vrms / 0.0040 Amps => 0.000 Amps
0.242 Vrms / 0.0049 Amps => flashing 0.000/0.001 Amps
0.250 Vrms / 0.0050 Amps => 0.001 Amps
0.300 Vrms / 0.0060 Amps => 0.003 Amps
0.405 Vrms / 0.0081 Amps => 0.005 Amps
0.502 Vrms / 0.0101 Amps => 0.008 Amps
0.600 Vrms / 0.0120 Amps => 0.010 Amps
0.702 Vrms / 0.0141 Amps => 0.012 Amps
0.802 Vrms / 0.0161 Amps => 0.014 Amps
0.900 Vrms / 0.0181 Amps => 0.016 Amps
1.001 Vrms / 0.0201 Amps => 0.018 Amps
2.002 Vrms / 0.0402 Amps => 0.037 Amps
3.004 Vrms / 0.0603 Amps => 0.057 Amps
4.004 Vrms / 0.0803 Amps => 0.076 Amps
So, the minimum detectable current which shows 0.001 value on the display is about 4.9 mA.
PS: I was used two 1 meters wires and 1 meter coax with alligator clips, so there is possible a little measurement errors due to cable resistance, capacitance and non reliable contact on alligator clips.
ThunderZed:
Thanks but I just forgot to say I'm evaluating this clamp as a cheap tool to measure domestic low currents, I mean "leakages", so we know the conditions: 50-60Hz, 220-230V AC (here in Italy) and a 1.5mm (= 0,059 in) diameter ground wire "many" meters (don't know) long. So could you please test this clamp on 2A scale in these conditions and tell me what's its minimum and "reliable enough" detectable AC value? I mean it'd be fantastic if you could compare its minimum value with a more reliable tool (eg. fluke) so we can answer the question: can this clamp measure down to 8-10mA in those domestic conditions with enough reliability?
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version