Abstract: A variable capacitor, which may be a humidity sensitive capacitor, and a fixed reference capacitor are connected at a node. The node is clamped at a reference potential during a first phase of a two phase measuring cycle as the variable capacitor is charged to a fixed voltage and the fixed capacitor is charged to a feedback voltage. The node is unclamped during the second phase and the capacitors are connected in a series loop to allow a redistribution of the charge in the capacitors or force a reversal of that charge with a voltage source. The deviation of the node from its reference potential after charge redistribution occurs is used as input to a feedback circuit which integrates that deviation over a number of cycles until it provides a feedback voltage of magnitude sufficient to cause the node deviation to be reduced to zero. A second reference capacitor can be supplied to provide an offset.

Abstract: A method for transposing the time of an event as read at a remote station with one clock to the time frame of another clock at a master station when the clocks are not synchronized and are of insufficient accuracy to provide measurements to within a few microseconds relative to other time measurements which are likewise transposed to refer to the master clock. A list of TV line 10 synch pulse times are maintained at the master for a specific number of recent line 10 pulses. Along with the time reading for the event, the line 10 synch pulse time as read at the remote is sent to the master. The list of line 10 synch times maintained at the master is examined to find the time by the master clock for the same line 10 and the difference between the time by the remote clock and the time by the master clock is used as an indication of the time correction factor to be applied for the transposition.