For those of us using QA400 Audio spectrum analyser, some measures to facilitate building some proper x10 and x100 measurements probes…out of old scope probes.
#3Measuring QA400 Quantasylum Audio Analyser input impedance to do some 10x or 100x probes
This is part 1 , in this video , I show how to measure and make sure you get the proper results.
In part two I’ll show, how to actually build them and the results on screen with 103,5 db THD+N with the probe and no signal versus the 105,1 THD+N with no probe attached…and verus first try adding a simple resistor to the end of a probe results in part 2
#3Measuring QA400 Quantasylum Audio Analyser input impedance to do some 10x or 100x probes
This is part 1 , in this video , I show how to measure and make sure you get the proper results.
In part two I’ll show, how to actually build them and the results on screen with 103,5 db THD+N with the probe and no signal versus the 105,1 THD+N with no probe attached…and verus first try adding a simple resistor to the end of a probe results in part 2
You need to compensate the inductance, I never use the 10x or 100x lol 1x with divider, I calculate the voltage without dividers and that is it.