| Products > Test Equipment |
| A look at the Uni-T UT210E |
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| shved:
Thanks marlonpnz I've successfully calibrated DC Amps dotless mode. |
| shved:
I've just modded and calibrated another meter. Thanks everyone. |
| kyleaudio:
The calibration adjustment procedure posted by marlonpnz worked on my Extech MA63 too. Thanks for posting that! |
| RobbiTobi:
Hi folks, I would like to share some details about using the UT210E as a buffer for a scope. Maybe you remember the awesome job Joe Smith did on the UT210E for getting the current signal out for using this probe with a scope - see post #347. Unfortunately - as far as I am informed there has not been any detailed information about the modification he did and which components he added. But there is a very simple way to improve the frequency response of the UT210E without adding any additional components to it. Just change some resistors and there you are ... you can achieve bandwidth of about ~20kHz@2A and ~100kHz@20A. Find the image attached showing a simple testing and comparison with a serious current probe - not bad at all for such a low-cost meter and the simple modification for few cents only! What you have to do? This meter has a standard instrumentation amplifier OP4330 configuration using 3 OPamps for the amplification of the Hall-sensors. Just distribute the gain over the available OPamps, instead of setting the total gain on the first stage only - i.e. gain=9 will become gain=3 for 1. stage and gain=3 for 2. stage. This results in higher overall bandwidth, due to the nature of the OPamp regarding its gain vs. frequency. You will need to change 5 resistors only - three on the first stage and two on the second stage - the values of the resistors are in function of the gain you want to set (see standard OPamp configurations). After you might re-calibrate the current ranges of the meter by adjusting the correction factors in the EEprom. That´s it... for those who can solder SMD it is a task of ~1h only at a cost of a few cents. Obviously, do not expect specs like a professional probe has, but you can further improve the meter by adding filters and/or better OPamps... Cheers and have fun! |
| dinth:
I have run self diagnostics as per @marlonpnz post a couple of times, but since i tried for the third time the self-diagnostics fails with Err0 error. What's going on? |
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