400 B/W Reflection Densitometer
4-24-2
The Murray-Davies formula for calculating Dot is:
Apparent Dot Area =
( )
( )
1 10
1 10
100
-
-
-
-
D
D
t
s
x
Where: D
t
= Density of tint minus density of paper
D
s
= Density of solid minus density of paper
The Yule-Nielson formula for calculating Dot is:
Apparent Dot Area =
( )
( )
1 10
1 10
100
-
-
x
-D /n
- D /n
t
s
Where: D
t
= Density of tint minus density of paper
D
s
= Density of solid minus density of paper
n = “n” Factor
Selecting Murray-Davies Formula
If you wish to use the Murray-Davies formula, you do not have to
make any modifications to the factory-preset mode settings. When
Murray Davies is active, dot values are displayed as percentages,
with a “%” sign.
If you set your instrument to use Yule Nielson mode by changing the
“n” factor, you can return the instrument to Murray Davies mode by
setting the “n” factor back to 1.00. Perform the following
instructions for selecting Yule-Nielson to reset the “n” factor.
Selecting Yule-Nielson
When you change the instrument’s “n” factor to a value other than
1.00, measurements are automatically calculated using the Yule-
Nielson formula.
To change the “n” factor”:
1. Press the FUNCTION button and the ENTER button
simultaneously, then release.
N cal X Y appears in the display, where “X” represents Status
response you selected (B or R).
2. Press FUNCTION to indicate no, you do not want to calibrate.
N mode Y appears in the display.
