Abstract
A simple portable proton precession magnetometer designed and constructed for Kodaikanal Observatory is described. Except for the signal amplifier, the instrument is transistorized. The accuracy of measurement of a absolute value of the earth's total field with the magnetometer is ±1 gamma. The precession signal voltage from the sampling coil is amplified and squared by a Schmitt trigger circuit, the output of which drives 10 stages of binary dividers. T4e first pulse in the output of the chain of dividers opens a gate allowing pulses from a 100 Kc crystal oscillator to pass to a pulse counter. The pulse immediately following -the opening pulse closes the gate. By suitable feed back of this closing pulse any following pulse is prevented from opening the gate again. For the next observation, a manual resetting is necessary. The number of 100 Kc Is pulses counted are used to compute the scalar field.
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