18
Measuring the opacity of a sample
To measure the opacity of a coating it must be drawn down on a Leneta
type opacity chart at the required film weight and allowed to fully dry.
To measure the opacity of plastic film, paper, textile or any other
semi-opaque material, place the sample to be measured over a black
and white test bed.
Rhopoint
Novo-Shade Duo
WHITE Value No.
45/0 89.7 1
Turn the instrument on by pressing the POWER key. For two
seconds the display will show the following message:
The display will then indicate the current measurement mode of the
instrument.
After a further two seconds the instrument will revert to
measurement mode as seen below:
*Note: To take reflectance readings the instrument should be set to
Opacity mode. For the procedure to switch between modes see pages 14-15.
WHITE Value No.
45/0 0 0
The text on the top left hand side of the instrument display indicates
the part of the sample to be measured. In the above example
‘WHITE’ is indicated. Up to six positions on the sample over the
white substrate should now be measured.
Press the READ key to initiate a reading. A line of arrows will
move across the screen whilst the instrument takes a measurement
and the display will show the results as in the example below.
Rhopoint
Opacity Mode
continued.
Repeat this to take up to five further measurements as necessary.