Abstract: A downhole microprocessor controller disposed in a well logging sonde receives and stores one or more preselected tables or series of logging tool commands down loaded from a surface computer through a logging cable telemetry link. Each tool command in a particular table may correspond to a specific function to be performed by a respective logging tool comprising the sonde. All such commands in a given table may be called up by the controller from memory in response to a corresponding sequence command from the surface computer corresponding with the desired table. Upon receipt of such a sequence command, the microprocessor sequentially recalls each of the table's tool commands and relays them in order to the tools.

Abstract: The invention includes directing an analog electrical signal through a plurality of discrete time delays in order to sequentially introduce cumulative time delays to the electrical signal. The magnitudes of the electrical signal before and after the introduction of each of the time delays are compared, and a plurality of pulse signals are generated in response to the comparisons. Logic circuitry is responsive to the logic conditions of the pulse signals to generate output signals indicative of the amplitude peaks or slopes of the electrical signal.