The inductance of the coil can be determined by connecting it to the test terminals of the instrument. The circuit is ned to resonance by varying either capacitance or the oscillator frequency. If the capacitance is varied, the r frequency is adjusted to a osc If the capacitance is pre-setted to a desired value, the oscillator frequency is varied until resonance occurs. The Q ading on the output meter be multiplied by the index setting or the "Multiply Q by" switch to obtain the actual value. The inductance of the coil can be calculated from known values of the coil frequency and resonating capacitor (C).
The Q indicated is not the actual Q, because the losses of the resonating capacitor, voltmeter and inserted resistance are all included in the measuring circuit. The actual 0 of the measured coil is somewhat greater than the indicated Q. This difference is negligible except where the resistance of the coil is relatively small compared to the inserted resistance R,h