From 93ea46d51288d443bb9bd161bd516baed0a8082a Mon Sep 17 00:00:00 2001 From: Astro Date: Wed, 16 Dec 2020 20:47:18 +0100 Subject: [PATCH] README: doc postfilter Fixes Gitea issue #21 --- README.md | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/README.md b/README.md index 9acdef9..094462f 100644 --- a/README.md +++ b/README.md @@ -157,6 +157,18 @@ Set the Beta parameter: s-h 0 b 3800 ``` +### 50 Hz filtering + +The AD7172-2 ADC on the SENS inputs supports simultaneous rejection of +50 Hz ± 1 Hz and 60 Hz ± 1 Hz (dB). Affecting sampling rate, the +postfilter rate can be tuned with the `postfilter` command. + +| Postfilter rate | Rejection | Effective sampling rate | +| --- | :---: | --- | +| 16.67 Hz | 92 dB | 8.4 Hz | +| 20 Hz | 86 dB | 9.1 Hz | +| 21.25 Hz | 62 dB | 10 Hz | +| 27 Hz | 47 dB | 10.41 Hz | ## Thermo-Electric Cooling (TEC)