Thanks and I'm glad you enjoyed it. I used that 61E for so many demonstrations where I made changes to it that I ended up giving it its own playlist. You can find that off the main page.

Thanks, I'm glad you are enjoying them.

The diode will change with temp. Running one sweep, I knew where we would need to place the compensation. Difficult part is trying to match it. As you can see, it can be done with fairly good results and very little cost. If comment below is correct and there are problems with long term stability, I would have a look at the cheap potentiometers on the board. Knowing what mode it drifts would help to know which parts to look at. Hope this helps.

Being it was seven years ago, I would be guessing. Judging by the package size, appears to be X7R. I would expect COH/NPO to be much larger. From the video, keep in mind there is no once size fits all. You will need a thermal chamber to compensate one. Still, those values may make a good starting point. Good luck.

@@joesmith-je3tq благодарю,жду когда приедут детали.

As I've mentioned, opening the test limits was done to increase the spread.

I assume what ever it was originally, or it would have thrown the OEM's alignment.

@@joesmith-je3tq Но вы же меняли детали,в том числе переменный резистор,неужели после замены вы не настраивали переменый резистор по эталонному напряжению?

@@user-mi8so5fj1v Yes and I would have set it back to the same value I read before the modifications.

I really have no idea what the longer term drift of the UT61E is. Are you seeing a particular mode changing a lot? If so, post your findings.

Hi, well, I saw a few posts on various forums talking about drift over time being a big issue on the 61E, I got mine early this year so not really too much time to notice something, I checked the voltage readings with a AD584K voltage reference on April and was just about 1mv off from the "certified" card on the VR, and I just checked now and it's the same values for the 4 voltages of the VR. [vref] (what is supposed to be) 02.5 2.49895 05.0 4.99767 07.5 7.49586 10.0 9.99345 UT61E (02.04.16) 02.5 2.497 05.0 4.996 07.5 7.494 10.0 9.992

Hi, i think all cheap meters with analog adjustment will be improve by better and low value potentiometer. Because falls, temperature, humidity affect to low quality potentiometer dramatically.

I have checked 3 same class meters for temperature, long term stability- Victor 86E(external reference), UT61E, VC9807(digital adjustment). No surprise digital adjustment win.

Yea, I have not seen a lot of long term drift data for the 61E beside a few people mentioning it. I did look at the smaller trimmers used on the meter TechnologyCatalyst supplied along with mine. Keeping in mind that I have changed VR1, I have gone ahead and recorded DCV, resistance and capacitance after I had aligned just VR1. I'll check it from time to time. Really haven't seen much of a problem with drift with the cheep meters I actually use. These get heat cycled and such sitting outside.

I can't answer if you need to care about temperature drift. If the question is if "I" care if the UT61E drifts, I cared enough to show people how to address it for less than a cup of coffee. I have no plans to ever use this UT61E beyond using it as an aid in these demonstrations, even though it is turning into a better meter each time I get into it.

Joe, if it was just about the UT61E, then it's okey. I thought you use the 61e as an example to show temp drift. Thanks anyway for the upload. I always enjoy your videos. If i ask you a question, it's not to fight you, but rather to get a better understanding.

From the video, I originally ran all the meters I had and posted the results. Someone then asked about running the 61E specifically. There were enough posts about adding the reference along with the drift of this particular meter, now that I have another one available it seemed worth while to repeat the test and try to improve the design.-20 to 60 may seem a little excessive for this particular meter but my goal was to determine the drift. Pushing the meter to a wider range provides me with more data. The fact it had no troubles running across such a wide range compared with the TPI that could not power up at -10, just shows it's not all that bad when it comes to temperature. As far as if you personally need to care about temperature drift in general, I have no idea.

If you had actually watched the video, you would know that this PCB is the newer design and that I compensated the original reference, not replaced it.

Too bad that the Fluke can't measure down this low.

There will be never an review on the Vc-890 multimeter ???

TechnologyCatalyst did one that may be found here:kzfaq.info/get/bejne/erpigLhkl9LFYpc.html

joe smith I wonder what happened with him. I did send him an email a couple weeks ago and no reply. Not like him to not reply. Hoping he is OK.

Perhaps on vacation and eating too much turkey? I did post the battery test results. Looks good.