HEIDENHAIN PWM 20 - Manual (Page 159)

162 HEIDENHAIN ATS Software User's Manual
6.2.4 Checking the reference signal (1 Vpp / 11 µApp)
8
"Reference trigger on/off" button to activate the "Reference signal" bar graph
8 Button for X-Y / Y-t display: Set the oscilloscope to Y-t mode.
Select traversing speed (shaft speed), sampling rate and number of samples such that the
screen of the oscilloscope shows one complete reference mark signal (peak and noise at
beginning and end).
Start/Stop button: With this button the entire display including the bar graphs
can be stopped for analysis.
Complete reference mark signal;
correct calculation of the display values Reference mark signal incomplete;
not suitable for calculation
Note
If a measuring accuracy (bar graph) of 1 degree is required, the following criteria must be
met:
1. A complete reference mark signal curve must be visible on the screen of the
oscilloscope, as the entire screen display is used to calculate the reference mark.
For encoders with reference mark selection (magnet or selector plate), the quiescent
value H must also be visible in the window.
(See signal diagram in chapter “Interface description” on page 209.)
2. The sampling rate must be set 360 times higher than the value in the frequency display.
If an accuracy of 10 degrees is sufficient, the sampling rate must be multiplied by 36 only.