Your link did not work but item 32818141467 appears to be the UNI-T UT136B. With as many UNI-T products I ran, I have never looked at this one.
I have thought about making a small cooler for my cardboard/foam meat packing box. This will be for fixed temperature testing. I've ran some drift tests for people in the past where I set the box to an elevated temperature and hold it. It would be nice to be able to run a sweep with it. I have not thought about running any sort of controlled shock test. Building some sort of dumbwaiter chamber would take far more effort than I would be willing to invest in a test like this.
Good look testing. As always, it will be interesting to see what you come up with.
The Fluke was the forth meter I have attempted to measure the contact resistance with while life cycling the switch. It has a long road ahead of it but I will say that the preliminary results are impressive. Then again, it's being compared with a free meter, the ZT102/AN8002 and a blown up POS.
My wife said I can't life cycle the original Fluke 101 I bought because it would be just wrong at this point. It has survived everything I have thrown at it but I am still thinking to do some sort of high voltage shootout with the surviving meters at some point. Cycle testing this meter may damage it. 50,000 cycles takes days at the rate I am cycling them takes days, so there is plenty of time to decide.
Well, I'm not quite willing to put up my ancient Fluke 73 (still has the gray bumper case even
), or the newer Keysight one up for this sort of testing. So went on aliexpress instead for now, I'll scour eBay for some main brand ones later maybe.
I ended up buying these two to begin with:
https://www.aliexpress.com/item/UNI-T-UT136B-Digital-Multimeter-Auto-Range-Tester-AC-DC-Voltage-Current-Ohm-Diode-Cap-Hz/32818141467.html https://www.aliexpress.com/item/NEW-NK-51E-Multimeter-VS-UT136B-UT120C-MS8233D-With-2000uF-Capacitance-and-Frequncy-Measurement-Auto-Range/32757114149.htmlThe second I mostly wanted because it's pink, honestly who wouldn't want a pink multimeter! (Maybe we should all pitch in and buy one for Dave?) Also have a couple of DT-830s hanging around that I've been meaning to blow up for months that I could include in the test. To be precise, I have an old capacitor bank laying around from an ill-advised railgun construction project ages ago, my main issue is that I can't find an affordable high voltage relay for it at the moment. Best one I could find on Farnell for a reasonable price arced internally, so planning to build my own transformer oil filled relay at one point or another.
But to get back to the subject at hand, the plan is to test the drift over the product lifetime by thermal cycling and ageing tests while I still have access to that climate chamber. After that I plan to just put them in water tight bags and expose them to some Belgian weather and see how long they last. Planning to verify drift and accuracy for voltage, current, diode, input impedance on volts, diode measurement current, and resistance measurements. For voltage, input impedance, and current I'll use a calibrated Keithley 2001 as reference. (If any of them would manage to go high input impedance I'll just pull out the 238 SMU and force the situation a bit
) For resistance I'll use some high precision wirewound resistors, and for diode I have some fun stuff laying around still that should be exceptionally stable.
Any remarks before I get started?