  Calibration is one area in measurement where our country is still in the
process of improvement. The absence of confirmed approaches and actions for
identifying the features of calibration baths by numerous laboratories
disallowed them to assess more the finest measurement ability and develop their
accurateness. In recent advances in technology, there is now a way of providing
the best measurement capability in temperature calibration by providing
validated methods in characterizing calibration baths that contributes to the
uncertainty of measurement of the calibrated thermometer and is therefore
important to measure the extent of its contribution to the final uncertainty.
This study adapted the process from obtainable and current methods. Platinum
Resistance Thermometer (PRT-Isotech) and Standard Platinum Resistance
Thermometer (SPRT-Hart) which are interfaced to Precision Digital Multimeters
were used for measurements. Quite a few measurements were made at varying time
durations implemented on several known positions in an orderly measurement form
which enclosed the whole workspace. The uniformities and stabilities of the
calibration bath were computed by getting the range of the Minimum Difference
with the Maximum Difference taken at every established temperature point.
Outcomes of measurements exhibited that the calibration bath stability at every
temperature setting are steadier at lesser temperatures and have a tendency to
rise as the temperature approaches 250oC. The liquid bath was further unvarying
at lesser temperatures. The variances found were insignificantly distributed
since the Standard Deviation ranged only from 0.005 to 0.013.
