P-N diagram (speed related to quantity)

Note: The P-N diagram evaluates only job-related times.

Objectives

The P-N diagram (1) shows the dependency of the good impressions per hour (Y axis; 2) on the good impressions per operation (X axis; 3) for each job from the selected period and for the selected machine(s).

It lets you differentiate between high-productivity jobs and low-productivity jobs and makes it easy for you to identify jobs with a high and low quantity.

Explanation of the P-N diagram

​•​Impressions per hour = good impressions/hour = productivity = P

​•​Impressions per operation = good impressions/operation = N

​•​Each dot represents a produced operation with a link to the job report (click on the dot).

​•​Graphic evaluation (curves) of the relationship between the following values:

​•​Average printing speed in impressions per hour (number of good impressions/total operation time = start to end of the operation).

​•​Impressions per operation (number of good impressions for every operation).

​•​Comparison of several machines in one diagram (dots of different colors represent different presses).

​•​Highly productive operations are above the upper section of the average curve, operations with low productivity are below the average curve.

Note: A job with two operations (perfecting) on one press is represented by one dot.

Reference to the job report

Every dot represents one produced operation. If you click a dot, the job belonging to this dot will display in the "Current job" dialog. You can then directly open the pertaining job report.

Zooming in a section of the chart

​1.​To do so, click the top left-hand corner of the desired starting area with the mouse and hold down the left mouse button.

​2.​Now use the mouse to draw a box from the upper left to the bottom right and release the mouse button. This defines the section to be zoomed in.