Application of an LVDT to an analytical balance
William L. Primak · Review of Scientific Instruments · 1974
The secondary voltage of an LVDT (linear variable differential transformer) is proportional to the primary voltage. The force exerted on the core varies as the square of the primary current or voltage. Thus, the scale sensibility of the balance equipped with an LVDT decreases with applied voltage. The voltage sensibility possesses a maximum, where, of course, the system is insensitive to fluctuations in the primary or excitation voltage. With a suitable voltmeter to read the secondary voltage, speed of operation is increased somewhat and precision is increased by an order of magnitude over that obtained when the balance is used conventionally.