Lesson 3/Learning Event 4
FIGURE 61. PRESSURE.
Setting the TEST SELECT switches to the required test number tells the VTM to make a pressure
measurement when the TEST button is pressed and released.
VTM supplies constant voltage to the pressure transducer.
The pressure transducer returns a voltage in proportion to the pressure being measured.
Voltage developed by the transducer is measured and converted to pressure by the VTM.
The VTM displays the pressure in PSIG, inches of mercury, or inches of water.