re: U1281A/U1282A susceptibilty: current datasheet (
http://literature.cdn.keysight.com/litweb/pdf/5992-0847EN.pdf) has the following paragraph:
Influence of radiated immunity: In RF electromagnetic fields of 3 V/M
DC voltage measurement accuracy:
60 mV, 600 mV ; ± 0.25% of range
6 V, 60 V, 600 V & 1000 V range; ± 0.1% of range
DC current measurement accuracy:
600 uA & 6 mA range; ± 6.3% of range
60 mA & 600 mA range; ± 1.9% of range
6 A range; ± 0.7% of range
10 A range; ± 1.4% of range
I.e. it's now your responsibility to ensure that field around the meter is <3 V/m to get ±6.3% accurate current measurements and if the field is stronger (which is quite easy to do as seen in the video), you'll not even get that
So, apparently, unless they already have a new revision of U1280 ready to ship, people opting for U1280-series replacement will receive meters still affected by this problem in a way similar to one shown in Dave's video