BALUN BL506, Руководство пользователя

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1. INTRODUCTION
1.1 DESCRIPTION
With high precision accuracy, the BL506 vacuum deadweight tester have dual vacuum and pressure modes. Pressure
and vacuum application can be operated by hand pump or external gas supply. To guarantee an excellent metrology-logic
characteristics, all pistons and cylinders are made of tungsten carbide. Because of the extreme hardness of this material,
the pressure distortion (expansion) coefficient is negligible. The low friction coefficient provides minutes of turning with just
a little swing of the masses.
1.2 OPERATING PRINCIPLE
A deadweight tester is based on a high accurate manufactured piston and cylinder assembly. This cylinder is mounted in
a column. The piston can rotate and freely move up and down. Accurately calibrated masses are loaded on top of the
vertically mounted piston. A pressure is applied on the bottom of the piston to lift the piston with masses. This creates a
balance between the downward force made by the masses and the upward force made by the pressure. With the known
effective area of the piston the pressure can be calculated. In formula: P=F/A, Where:

P = the pressure being derived

F = the force applied by the weights

A = the effective area of the piston cylinder