Patent ID: 7020565

Claim:
An analyzer for monitoring parameters of a machine including machine vibration and for receiving an analog raw tachometer signal having a magnitude and a plurality of tachometer pulses having a cycle time corresponding to a speed of the machine, the raw tachometer signal including noise which may include spurious pulses, comprising: a. a user input interface for receiving and transmitting a user input, b. at least one analog input for receiving a raw analog signal having a magnitude, c. a conditioning circuit connected to the analog input for receiving and processing the raw analog signal and producing a conditioned analog signal, the conditioned analog signal being produced from the raw analog signal based on predetermined criteria, the predetermined criteria including an input limit which is satisfied when the raw analog signal satisfies the input limit, d. a data processor for receiving and processing the user input and controlling the analyzer based in part on the user input, e. an output for producing an output signal at least in part corresponding to the conditioned analog signal, f. the analog input including at least a tachometer input for receiving the raw tachometer signal, g. the conditioning circuit including at least a qualifying circuit connected to the tachometer input for receiving and processing the raw tachometer signal and producing a qualified tachometer signal, the qualified tachometer signal being produced when the raw tachometer signal is qualified based on predetermined criteria for distinguishing between the tachometer pulses and spurious pulses, the qualified tachometer signal being produced in response to tachometer pulses not being produced in response to spurious pulses in the raw tachometer signal, and h. the output for producing an output signal corresponding to the qualified tachometer signal.