Abstract: Method and apparatus for testing hermetic seal integrity of sealed packages and containers, are provided. The method includes placing a sealed test package having at least one semi-flexible surface, within a test chamber. The pressure within the test chamber is changed from a first value to a second value, over the time interval of a test cycle. During the time interval of the test cycle, both the pressure within the test chamber and the displacement of the semi-flexible surface of the test package are continuously measured, and produced therefrom, are a first analog data signal proportional to the pressure within the test chamber, and a second analog data signal proportional to the displacement of the semi-flexible surface of the test package. During the time interval of the test cycle, the first analog data signal is converted into a first discrete data sequence, and the second analog data signal is converted into a second discrete data sequence.

Abstract: A system for counting electrical pulses representing red and white blood cells and for determining hematocrit, mean corpuscular volume and hemoglobin in association with the blood cell counts. The system includes a blood cell transducer through which a blood sample is caused to flow and operative to produce electrical pulses in response to the passage of cells through a metering aperture. Red and white blood cell counts are electronically accumulated during respective analytical runs and logic circuitry is provided for determining, during a red blood cell counting run, mean corpuscular volume and hematocrit. The system can also include correction circuitry to correct for the coincident passage of cells through the metering aperture.