ACCURACY OF AN AUTOMATIC SECOND DERIVATIVE PLOTTER.
AIR FORCE AVIONICS LAB WRIGHT-PATTERSON AFB OHIO
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The influences of the finite signal amplitude, delta V, the finite current sensing resistor, R sub J, the signal-producing resistor, R sub S, the noise, and the system hysteresis on the second harmonic curves of an automatic second derivative plotter are determined experimentally for a simulated probe Si-diode and for a real Langmuir probe. It is found that, in general, undistorted second derivative curves are obtainable without any of the three quantities having to be excessively low. Author