Abstract: A properly designed expansion chamber is mounted in a flowmeter test equipment configuration to quench or prevent pulsations from resonating the acoustic cavities in the configuration and, thereby, eliminate resonation errors in testing the accuracy of the flowmeter. The invention is particularly though not exclusively adapted to use with a testing configuration including a prover master meter and a conduit connecting the inlet of the prover master meter to the outlet of the gaseous flowmeter being tested. In the practice of the present invention, the pulsation frequencies can be quenched before the acoustic cavity within the conduit can be excited by introducing an expansion chamber at one or both ends of the conduit.

Abstract: A self-contained correction unit operable in conjunction with a gas meter measuring an actual gas volume emits a digital output signal correlated to an equivalent standard gas volume therefor by correcting the actual gas volume for prevailing conditions of temperature and/or pressure. A temperature and/or pressure transducer is utilized which when exposed to the gas flow emits an analog voltage signal proportional to absolute values of the sensed parameter. By scaling the transducer output signal to a base condition voltage representing unity, a signal proportional to the desired correction is derived which is converted to a digital signal for supplying to a divider-counter. Within the divider-counter, a series of repetitive pulses corresponding to the actual volume measured by the meter is divided by the digital correction signal to yield a digital output signal of the corrected volume at the base condition for which correction was being sought.