Going over my notes for the prototype to sort out what tests I plan to run. One of the problems I came across was with the VA mode. Roger, who ran the YT channel KainkaLabs, repeated my tests. He did a really nice job explaining the problem and how to work around it. I doubt I will go over this problem again, so if you're interested, I suggest you watch his video.
That was a slick fix, Joe.
When I demo'ed that back in 2017, I caught some flack over it. I was glad to see another person finally post a video on the VA mode and was even more pleased when he repeated my test. I haven't downloaded the latest manual yet to see if they ever did anything with it. You know the old saying "you can't push a rope"?
I made an attempt to repeat Dave's settling time test using roughly the same resistance value. I've ran this same test before with the prototype and even older firmware. The left 121GW old production hardware is using firmware 1.57, the right 2.02. The counter is clocked at 1KHz. MOSFET switches are used for controlling all three meters (can't have that switch resistance changing with my thumb pressure). The FETs trigger is derived from the 1KHz clock source (my Arb).
The video was first shot in real time. It was then stretched to slow it down by 4X. The last segment was shot at 1000fps. The camera can only capture a few seconds of data in this mode.
I used the Gossen the last time I ran this test as well as it's the only other handheld meter I have that will display three places beyond the decimal point. Obviously we would expect my other lower resolution meters to be much faster. I'm fine with the settling time of the 121Gw, if the meter would actually settle.
This Gossen meter is not stock. I had added some magnetic shielding (Netic) to the rear and some copper shielding to the front. Otherwise it was a great sensor for detecting all sorts of environmental conditions.
I would actually say the meter could be dangerous to use in CAT III. Like the 121, there were modes where the meter would show very low voltages in the presence of high voltage levels. Really bad IMO.
See Part 4 @ 7:40