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Fermium / hall-effect-handbook

Public docs about the Hall effect instrument
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aggiungere equazioni mathsheet a manuale #18

Closed ddavidebor closed 5 years ago

ddavidebor commented 5 years ago 
mathsheet: |
    # Temporarely used CH6 (not amplified) as ch7 appears to not work correctly
    Vh = ch6 V
    # Voltage on the thermocouple
    E_mv = (ch2/122.4)*1000
    coeff = [-0.383695902,25.215123839,-0.279516961,0.072045800,-0.014094503,0.001055528]
    # Temperature from a termocouple voltage. See NIST tables and user manual
    temp =  coeff*(E_mv.^range(0,5))degC
    # Vr is the voltage measured at the hall sensor ends, using a 4-wire (kelvin) resistance measurement method.
    # The signal is amplified with a gain G=1/7
    Vr = ch1*7 V
    # The current is revealed on a precision 4 Ohm resistor. The voltage on this resistor is amplified with a gain G=1/7
    I = (ch3 * 7 ) V / (4 ohm)
    # resistance of the sample
    R = abs( Vr / I )
    # Magnetic field probe. The signal from a Hall sensor is amplified with a gain of about G=9.82
    # The sensor output voltage is about 0.2V/Tesla
    B = (ch7-0.0245) V / (0.2 V / T)
ddavidebor commented 5 years ago

unrelated to 2019 version