In a hand-operated torque primary standard machine, many parameters are very peculiar and can really influence the final results of a calibration. The paper presents studies to quantify how those parameters act and be able to influence on the main operations of this type of machine. As a conclusion, it is demonstrated that only an initial characterisation of the system is not enough to guarantee good results but, the day-by-day use of the machine demands for practice and better knowledge of the cited parameters.

In the evaluation of uncertainty of the forces generated by deadweight force standard machines, several contribution should be taken into the account. One of them, that normally is considered negligible, is the influence of aerodynamic effects. In the paper the theoretical analysis of this effect and the experimental measurements made on the INRIM deadweight FSM Galdabini 1 MN are presented.

This paper shows the results of an interlaboratory comparison in Thailand for weight conducted three times. At the first starting from October 2001 to December 2001, eleven participating laboratories joined in OIML weight 500 g F1 and brass weight 500 g programs. Next, from October 2003 to February 2004, F1 OIML weights of 100 mg, 10 g, 1 kg and 5 kg were calibrated among sixteen participating laboratories. At last, started from May 2006 to July 2006 with two sets of F1 OIML weights : 100 mg, 2 g, 20 g, 50g and 1 kg, seventeen laboratories participated. The National Institute of Metrology (Thailand), NIMT, Mass Laboratory under the Department of Mechanical Metrology was a pilot laboratory, which as the coordinating interlaboratory on these three programmes, carried out to check the results on these artifacts at the beginning, the middle and the end of circulating loop. The report of these comparison is being in this document.

Torque laboratory of National Institute of Metrology Thailand has designed and developed the prototype of torque transfer wrench and torque wrench calibrator by using load cell as main device in order to provide low cost torque transfer standard. Loading point of load cell was designed to directly connect to torque measurement axle. Moreover, loading point and base of load cell were supported by elastic part acting as flexure bearing. Torque standard machine and commercial torque transfer wrench were used to compare torque measured by the prototypes, torque transfer wrench and torque wrench calibrator respectively. Simulation from finite element analysis confirms that the design can be used as torque measuring device. Metrological properties are investigated according to standard DKD 3-7 and DKD 3-8. The experiment and calibration result shows that uncertainty is within ±0.08% for torque transfer wrench and within ±0.3% for torque wrench calibrator.

We use the U-type height method to measure the liquid density. The system is like a U-type manometer, while the different liquid used in the tubes. One of the tube was set to the air pressure, another one was decreased the pressure below 1 atm. When a lower pressure was pumped into the tube from the top end, the heights of the level of liquid were measured. Then we got the density of the liquid.
During the experiment, the laser interferometer and proper floating reflectors were used. We utilized these instruments to measure the levels of the liquid. These results for measuring water and alcohol will be presented in the conference.