Abstract
A small, on-line, calculator-based measurement system is described for determining capacitance C, conductance G and dielectric loss, tan delta , in the frequency range 0.4 Hz to 2.0 kHz. The voltage across the sample under test and the current through it are multiplexed into a transient-recorder memory and subsequently analysed using least-squares curve fitting to yield the amplitudes and phases of these waveforms. Amplitude accuracy is +or-0.5% and the maximum error in phase angle difference between current and voltage is +or-0.1 degrees . The system allows large-amplitude AC voltages ( approximately 100 V peak-to-peak) to be applied to a sample under study, resulting in increased sensitivity at the lower frequencies. The current is recorded using an operational amplifier connected as a current-to-voltage converter with virtual ground input.
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