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a new milestone for me: I threw together some C code, shell scripts, cables and test gear in order to see how linear my relay attenuator (for audio) is.
link to my write-up on how I did all this:
www.amb.org/forum/automated-testing-of-delta1-steps-t1752...
the fluke shows 17.44dB measured and my LCDuino says it should be 17.5dB. that's .06dB error on this step. not bad, huh?
with 50v put into the attenuator, the fluke reads 6.728v out. I have the fluke setup to read both relative dB and absolute volts in its two displays (and also on its serial port).
a typical fluke line would look like:
-17.44 +6.7275
or
-125.42 +0.027E-3
-126.02 +0.025E-3
-126.33 +0.024E-3
-127.00 +0.022E-3
-127.18 +0.022E-3
as we get closer and closer to 127.5dB attenuation (the most this relay board can handle).
(not all the equip shown was used; but if it had its display on, it was part of this test) ;)
From the Dual Wet sponge wet-wear bio-electric brain and outreaching nervous system that was compelled by an external magnetic universe that whirls all around us in ever changing perspectives and limitless strata for us to test and measure, formulate our theory's and have them peer reviewed to know we're all on the same good page that always leads us to our sound conclusions, which may not always look too pretty on a wall of chalk boards filled with a mass of "show us your work, young man!" And the resulting eye pollution, our attempt to please our short tempered school masters wishes.
Perhaps especially to the grumpiest of us, a most Merry Christmas from one of your loving students who finally learned your true value...peer review pending.
Cheers! :)
Jeffrey Glenn Peletz
Dec 2020/5781