magnetometrers:
ENV_NEB_MAG_N reference position along NS - connector pointing S
ENV_NEB_MAG_W reference position EW - connector pointing W
ENV_NEB_MAG_V onto tower base EAST side along EW - connector pointing W
ENV_NEB_MAG_COIL_N = fluxgate probe, at coil center, along coil axis towards N

injecting colored white noise, amplitude 2V
ACL_FILTER_SET         "flt3"             1 1 500 20
ACL_FILTER_BUTTERWORTH "flt3" "bandpass" 4 3  500 500
ACL_NOISE_CH noise_white "V"     5    SAMP_FREQ    2

1326542896  18 Jan 2022 12:07:58 UTC  (18 Jan 2022 13:07:58 CET)
1326543986  18 Jan 2022 12:26:08 UTC  (18 Jan 2022 13:26:08 CET)

Rotate the magnetometer on tower base:
MAG V is now along NS connector pointing N

1326544067  18 Jan 2022 12:27:29 UTC  (18 Jan 2022 13:27:29 CET)
1326544271  18 Jan 2022 12:30:53 UTC  (18 Jan 2022 13:30:53 CET)

we move the probe MAG_COIL .... away from the SAS wall. Now it is no more saturating.
We also flipped (180deg) the probe orientation. 

1326544458  18 Jan 2022 12:34:00 UTC  (18 Jan 2022 13:34:00 CET)
1326545109  18 Jan 2022 12:44:51 UTC  (18 Jan 2022 13:44:51 CET)

MAG_V onto tower base EAST side along EW - connector pointing W
1326545179  18 Jan 2022 12:46:01 UTC  (18 Jan 2022 13:46:01 CET)
1326545861  18 Jan 2022 12:57:23 UTC  (18 Jan 2022 13:57:23 CET)

-- 

Promemoria:
riguardando assieme a Irene, non sembra che ci siano due poli 
(la risposta scende di una decade di ampiezza per ogni decade di frequenza).

I conti TEORICI della bobina sono R= 7.4 Ohm, L= 72mH, quindi piu' o meno un POLO attorno a 15 Hz se 
si pilota in tensione (come stavamo facendo).
Se vogliamo levarlo, basta pilotare in corrente.


Ciao
Fede