Teledyne 2750 - Portable turbine generator gas analzyer - Manual (Page 18)

Theory of Operation Model 2750
Teledyne Analytical Instruments 18
width modulated (PWM) signal that is proportional to the gas
concentration on that specific range.
The PWM signal is passed through a low pass filter and is used to
drive the display and the 0-1 VDC output signal (0.8 – 1VDC for the
H
2
/Air range).
The calibration switch is a rotary switch and allows either the
percent of range signal or the output from the zero offset gain amplifiers
to be sent to the display.