Operator`s manual

CHAPTER FIVE

5-34

Measuring Paper

The instrument takes the density value of the paper and

automatically subtracts it from subsequent trap measurements.

Paper is always subtracted from the trap function.

To measure paper:

1. If not selected, press the Tab Up key $ or Tab Down

key @ to highlight Paper. <Measure Paper>

appears in the user dialog. The paper values

displayed are the current values set in the instrument.

2. Center the instrument target window over a sample of

the paper, and lower the instrument to take a reading.

3. The paper values are updated and the display

highlight advances to OverP.

Measuring Trap Procedure

So far, you have performed the procedures to select the

trap formula and measure Dmax and paper.

You are now ready to begin taking measurements to check

trap values. Trap is calculated after measurements of the

paper, overprint, second ink printed, and first ink printed.

NOTE: If the highlight in the measurement list changes to an

incorrect item after a measurement, use the $@ keys to move the

highlight to the correct item before releasing the instrument.

To measure trap:

1. After measuring paper (and Dmax for newsprint),

make sure OverP is highlighted on the screen and

center the target window on an overprint patch.

2. Lower unit to target window and hold closed. Once

measurement data is displayed, release the unit.

3. Make sure Ink2 is highlighted on the screen and

center the target window on second ink down patch.

TRAP-REF

Options

Paper

OverP

Ink2

Ink1

V 0.13

C 0.12

M 0.13

Y 0.22