  This paper describes the realization of a two terminal-pair digital impedance
bridge and the test measurements performed with it. The bridge, with a very
simple architecture, is based on a commercial two-channel digital signal
synthesizer and a synchronous detector. The bridge can perform comparisons
between impedances having arbitrary phase and magnitude ratio: its balance is
achieved automatically in less than a minute. $R$-$C$ comparisons with
calibrated standards, at kHz frequency and 100 kohm magnitude level, give ratio
errors of the order of $10^{-6}$, with potential for further improvements.
