Abstract: The cold cathode fluorescent flat lamp includes an enclosure chamber sealed by two reciprocally parallel plates of glass and containing a gas therein, an anode and a cathode disposed in the enclosure chamber, wherein the cathode is parallel to the anode, an auxiliary anode disposed between the anode and the cathode and being parallel to the cathode, wherein the auxiliary anode is attached to a surface of either plates of glass, and a printed circuit board for providing a voltage for the anode and the cathode.

Abstract: An improved frequency counter for more reliably reading the frequency of low level signals by employing a method of separating the desired signal from undesirable noise related signals, wherein the frequency counter comprises signal input amplifier circuitry, a frequency modulator circuit for phase shifting the self-oscillation frequency of the undesired signal to isolate it from the valid signal, a prescaler circuit, a frequency or pulse counter driven by the output of the prescaler, and a correlator circuit for differentiating the self-oscillation frequencies from the main signal frequency so as to reduce false correlations between the self-oscillation, or noise, and valid signals.

Abstract: An improved frequency counter for detecting and distinguishing a main input signal from amplifier generated self-oscillating signals, wherein the frequency counter generally includes an input circuit having an amplifier and Schmitt-Trigger, a microprocessor for controlling the main gate to a main counter and user inputs, and a signal level display, all of which communicate with the main counter, a display driver and a frequency display for more accurate frequency measurements.