It is amazing of how much of help it is the sum of my current tool-pack.

DCUU PM9913 + data logging software (power meter)
FLK 8846A + TsDMMViewer data logging software
And both instruments recording all the action simultaneously, of my U1272A with it range switch at OFF position.
The test executed by active AC power supply, this stabilized at 225V, by the use of VARIAC transformer I do boost that at 230V ( both devices able to deliver 2KVA of power).
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Test results along comments. U1272A with it range switch at OFF and or at ZLOW position, due it internal Low impedance mode, this causes at fist connection to mains, a load of
41 Watt at 230V AC.
U1272A electronics circuit, will be called to handle high current condition for 3 seconds of time,and
a peak of 178.8 mA. U1272A electronics circuit, will self adjust within 5 seconds of time, and the loading this is now
approximately 30mA U1272A electronics circuit, will self adjust within 30 seconds of time, to a much lower current of 3.2 mA.
By the eyes of electric energy, U1272A causes
41 Watt peak value and
0.72 Watt of a constant load, for as long this stays connected to mains.
At the charts below they are plenty of information's.
At my eyes, it seems as very interesting even the Power Factor curve.
For a first time since ITTSB Europe foundation, I have such a complete set of recorded results.

I can dive to more timing details by adjusting TsDMMViewer data logging software, and to set as first option of chart length, a window of 30 seconds, so to better record inrush current.

About comments, I do not think that ZLOW as a
Low impedance mode, this has any electronic design flaw.
Never read any customer feedback, that any of these U1272A, U1273A and U1273AX has been damaged at ZLOW circuit.
What I am exploring here this is the behavior of ZLOW.
For example at
1000V ACV or DCV, the instant loading, this might be four times higher =
164 Watt And therefore I bet that Agilent / Keysight, it did their math at product design room, and any passive components that they did select, they are able to tolerate this inrush current with out damage.
My next data logging adventure will be to record ZLOW behavior, with starting voltage of 15V, because I do perform long term 12V battery monitor, so to inspect top up charging events, at my APC UPS, in this application I have two U1272A constantly connected at two battery cells.
After this new test, I will be able to decide of what is best?
Leaving then connected at DCV and use Auto power OFF timer, or to switch them OFF by the range switch?
