- A Wide - Range V H F Impedance Meter

Ever since the middle of the last centurywhen Sir Charles Wheatstone first put to practical use a curious electrical balancing network which had been devised a decade before by a fellow Englishman named Christie, the bridge circuit has been accepted a s avaluable and powerful tool in the field of electrical measurement. Even though today bridges, like almost everything else, have become increasingly complex in order to meet the demands of highly specialized applications, they retain, fcr the most part, the fundamental advantages of convenience, sensitivity and accuracy which characterized their more straightforward antecedents. One of the applications in which bridge circuits have been particularly useful in recent years is the measurement of impedances at radio frequenT y p e 2 5 0 4 .