Abstract: An on-board measurement system includes a plurality of measurement modules each provided with internal or external transducers and a control module for conducting desired testing procedures. The modular logging apparatus is removably secured to a product undergoing a manufacturing process or the like whereby numerous or substantially continuous measurements can be made of environmental factors affecting a product. The control module also receives and stores measured data for later retrieval.

Abstract: A test lead set for a four-terminal ohmmeter comprises separate conductor pairs with one conductor of each pair connected to a source while the other conductor of the same pair is connected to a meter. The conductor pairs, which are received within separate insulating shrouds, are provided at their remote ends with bifurcated clips having jaws for making individual connections between the conductor leads and a terminal of a device under test. The test lead set is coupled to the measuring instrument by banana-type plugs having separated conductive portions for engaging contacts within instrument receptacles so that separate connections to the source and measuring device can be maintained. The instrument receptacles are backwards compatible with a conventional, two-terminal, test lead set.

Abstract: A compact isothermal connector for a thermocouple temperature measurement system has electrical contacts with thermal mass sufficiently larger than the thermal mass of the corresponding contacts of a corresponding thermocouple connector to provide for improved settling times and measurement accuracy. The contacts are thermally coupled to a multi-layer printed circuit board containing layers of embedded thermally conducting material to achieve sufficient thermal coupling between the contacts. The contacts have sufficient thermal mass to achieve a desired settling time. A temperature sensor is thermally coupled to the printed circuit board and to each electrical contact to sense the temperature of the isothermal connector and provide the temperature information to a temperature measuring instrument to correct for measurement errors from the connector junction voltage.

Abstract: A measuring device includes a microprocessor controller programmed for performing any of a plurality of mathematical functions on a measured value of a parameter under test. The measuring device is provided with two displays, for displaying to a user both the parameter value and its mathematical function. Annunciators are provided to identify the displayed function of the parameter. Thus, together with the measured parameter value, offset, scaling, peak-to-peak values, or the uncertainty of a reading may be displayed, as well as statistical functions of the measurement, including an average, standard deviation, median or mode of the parameter under test. The methematical function display is updated concurrently with the display of the measured parameter value.