A survey questionnaire dealing with instrumentation, calibration and error estimation of guarded and calibrated hot boxes was mailed to United States and Canada hot box laboratories capable of measuring the R-value of building assemblies. Questions pertaining to types of instrumentation, estimated accuracy of the specific instruments and error analysis calculations were asked. Responses from those laboratories responding to the survey are summarized in the paper. This information will be beneficial to future revisions of the ASTM guarded and calibrated hot box test methods.
After a brief review of the electromechanical functioning of the piezoelectric accelerometer, factors affecting its dynamic response characteristics and therefore the validity of vibration measurement are discussed. Consideration is given to variables such as shunt resistance and capacitance, mounting methods, base bending, cable noise, groundloop currents, and environmental effects. Approved accelerometer mounting techniques that will ensure the accuracy and repeatability of the measurement are also described.
A questionnaire dealing with operating techniques and procedures of guarded and calibrated hot boxes was mailed to 14 hot box operators in the United States and Canada. Questions pertaining to testing capabilities, instrumentation, calibration specimens, steady-state criteria, etc., were asked. Responses from the 13 laboratories returning the survey are summarized in the paper. This information should be of interest to hot box operators, as well as prove helpful in future revisions of the guarded and calibrated hot box test methods.
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