I am lucky enough to have both a QA-ES ii and a 454a analyzer。
From
https://www.slideshare.net/merwine/5th-generation-esu-technology-june-2009this documentation I found many errors,For example, QA-ES ii does not use capacitors, but uses impedance matching technology.The documentation says it's a capacitor.And the analysis is not objective. It has been emphasized that the technology of BC GROUP is very advanced.In addition, the QA-ES II uses a resistor with 0 inductance, and there is no inductance at high frequencies.
This doc looks more like a salesman's marketing gimmick ^_^
QA-ES II uses impedance matching technology, using AD834 multiplier
454a uses the principle of current sensing, using the LT1088 thermal conversion principle, so QA-ESII responds to DC signals, and 454a only responds to AC signals
Fluke's latest QA-ES III analyzer, I don't think it is a revolutionary innovation, the selected solution may also be AD834 or a similar chip, maybe a higher precision resistor is selected for the load resistor, but I think this has no practical value , the only bright spot is that QA-ESIII has increased the frequency display function, but this is actually not important
