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| .rpv:
--- Quote from: joeqsmith on December 31, 2016, 03:23:46 am ---I hope you watched at least the last few minutes of that part 1 and understand that it's pretty much like every other UNI-T I have looked at with a weak front end design. I went to look at my spreadsheet and I never ran checked the continuity on the UT61E. At 4Hz the 181A is not a great performer but better than a lot of the ones I tested. Certainly able to detect a short fast enough at 1.5ms. Hope you enjoy it. --- End quote --- Yes, I saw the 2 parts, the 61e it's same or even a bit worst but so far so good 8) I'll order some of those buck converters after the chinese new year :P , BTW did you find why got burned? And yes, I enjoy a lot of your reviews, somehow I got addicted to multimeter reviews, I really like your approach about comparing at least 3 meters, your comments about the tests and creating 2 episodes where the torture test it's apart, but being honest I really don't know where you can find those kv peaks on real life. Very nice work and understandable even for a hobbyist :-+ |
| fs92:
Hey there, though there's been no post for some time it's a very informative thread for me. I got the UT181A in used condition from ebay recently, but it seems to have a problem with measuring low resistances. Can you do a reference measurement for me, so i know if mine is defective. If i measure a resistor rated 15 Ohms in Autorange mode, the multimeter shows OL (to low resistance / continuity). When i switch to Kiloohms manually, it measures correct: 0,0144 Ohms. But not in Ohms range, even in manual range. Could you do a measurement with something like 10, 15, ... Ohms? Thank you very much in advance :) :) :) |
| bartwas78:
Hello everybody. Just got my UT181A yesterday and I thought I will share my small mod for long time logging. I have fitted 2mm banana posts in the back, they will be directly connected to battery for lipo charging. Still waiting for JST XH connectors to make harness inside the meter. Posts will be hot glue gunned (black color) to make it a bit waterproof and the area will be covered with aluminium tape to restore shielding. Hope someone will find this useful and more esthetic than previous battery mod. |
| joeqsmith:
--- Quote from: bartwas78 on November 15, 2020, 02:02:24 pm ---Hope someone will find this useful and more esthetic than previous battery mod. --- End quote --- You don't provide enough information to suggest how you plan to keep the unit charged and provide isolation. If these wires are shorted, what happens to the internal cell? What happens if you overcharge the cell? Your mod would interfere with the BLE interface, prevents laying the meter flat, if there was a warranty I suspect it voids it. I just finished charging my 181A. It takes a good 12 hours, during which the meter can't be used. It has roughly a 40 hour up time. I'm not sure on the BLE battery life. I wonder if someone would ever offer a high capacity battery holder that bolts into the back cover, similar to the Fluke 189. |
| bartwas78:
Well... Isolation, was thinking to use two shottky diodes and set up charging voltage higher than 8.4V (+2xVfd) and put label in the back. The terminals have no metal parts exposed, they are deep inside the plastic so there is not much risk shorting it on flat surface anyway. With diode isolation it will be perfectly safe to short it. Regarding charging I believe most of us have some experience charging lithium batteries and I believe we all know what we are doing. if someone wants could easily modify battery and attach cheap 2s BMS from china to protect the cells from any kind of accidents. About meter in flat position, you could get 2mm banana connectors and they are really tiny so meter could be still used flat. Of course warranty on mine is already gone, but there are ways to have it fixed under warranty anyway. I believe i have found 3600mah lipo battery which will fit in there, just ordered it. Look for battery for Wltoys 12428, looks like it has the right size and with bit of modification will be working fine with fast charging capability (2hrs easily). When it comes I am planning to fit it with proper BMS and get 60hrs run time. |
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