Measurement of straightness of panel sides horizontally

The panel is put upside down on three calibrated blocks A, B and C as shown in Figure 8.

A 5 kg mass H shall be placed as shown in Figure 8.

Zero the dial gauge F to the manufacturer's stated size.

Measurements shall be made at the manufacturer's stated point within the normal supporting area and within the edge trims.

The deviation on the four corners is successively measured, by turning the panel.

Expression of results including methods of calculation and precision of test methods

Readings are to be taken to two decimal places and shall be rounded and recorded to the nearest

first decimal place. All measured deviations shall be within the values given in Table.