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Environmental Monitoring (Environmental Monitoring)
fiori - 10:37 Tuesday 28 May 2019 (45978) Print this report
test magnetic broadband noise injection levels

Scope: set ENVnoise parameters to inject broadband MAG noise in CEB (testing without ITF)

Figure 1 (blue):  CEB colored: this gives 3.5A rms out of Amplifier BBA120 (max is 6 Arms) and CEB_MAG see factor 10 (W) factor 20 (W) and factor 30 (V) above quiet BTW 10 and 90Hz

ENVnoise.cfg

ACL_FILTER_SET         "flt3"             1 1 50 1          # -->  sets gain 1 @ f0 Hz
ACL_FILTER_BUTTERWORTH "flt3" "bandpass"  4 3 45 70
ACL_NOISE_CH                noise_white            "V"     10    SAMP_FREQ    0.04

Figure 3 (blue): by mistake left flt3 gaion at 50: however, significant magnetic broadband noise injected, at least x10 from 100Hz to 1kHz (not bad!), and also large down to 1Hz in V MAG. Amplifier output is less than 4 Arms  (max is 6 Arms)

ENVnoise.cfg

ACL_FILTER_SET         "flt3"             1 1 45 1          # -->  sets gain 1 @ f0 Hz
ACL_FILTER_BUTTERWORTH "flt3" "bandpass"  4 3 300 300
ACL_NOISE_CH                noise_white            "V"     10    SAMP_FREQ    0.0003

Figure 2 (blue): better tuned, factor x10 broadband noise from 100Hz to 1kHz

ENVnoise.cfg

ACL_FILTER_SET         "flt3"             1 1 270 1          # -->  sets gain 1 @ f0 Hz
ACL_FILTER_BUTTERWORTH "flt3" "bandpass"  4 3 270 330
ACL_NOISE_CH                noise_white            "V"     10    SAMP_FREQ    0.02

Figure 4; shows line injections; mag field amplitude is typically at least x100 above mag quiet in order to see something (less than x10) in hrec: so likely need more powerful amplifier, or larger coil....

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