Fluke Biomedical 90-12 - Manual (Page 12)

Victoreen 90-12
Operators Manual
3-2
3.2 Circuit Description
A simplified equivalent circuit is shown in Figure 3-1.
Figure 3-1. Circuit Diagram
High voltage is applied to the anode and the cathode is at electrical ground. If the gas volume detects a
free electron from an ionization event, and a current pulse occurs, this will appear as a momentary
decreased voltage across the resistor.