Index Tooth; Z-Tooth Types - Ametek DN VR-608 Series User Manual

DNx-VR-608 Variable Reluctance Interface
Chapter 2 10
Functional Description
2.1.1

Index Tooth

On some toothed wheels, one tooth is a different height or width than the others.
This tooth is called the "index tooth" or "Z-tooth." The Z-tooth changes the
frequency and amplitude of the AC waveform as shown in Figure 2-3. For each
Z-tooth type, the top row shows the physical teeth, the middle row shows the
simplified AC waveform, and the bottom row shows the digital output signal. The
index tooth determines the position of the shaft (i.e., the VR interface resets the
count upon detecting the index tooth).
Figure 2-3 Z-Tooth Types
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