SECTION 4 Calibration

4.1 Hastings 760 Plus Piezo Transducer manufacturer Zero and Span Adjustment

1.Install the transducer and power supply/display then apply operating power. Wait a minimum of 15 minutes before proceeding.2.Evacuate system to a pressure less than 0.010 Torr (1.00E-02 Torr). 3.Adjust transducer zero trimpot (Fig. 2-1) until the power supply/displayindicates 000.0 ±000.1 Torr.4.Increase system pressure to atmosphere and adjust span trimpot until the power supply/display indicates the known local atmospheric pressure ±000.1 Torr.5.Repeat steps 2 through 4 if necessary.

4.2 Hastings 760s Option-5 Transducer Zero and Span Adjustment

1.Install the transducer and apply operating power. Wait a minimum of 15 minutes beforeproceeding.2.Evacuate the system to a pressure less than 0.01 Torr (1.00E-02 Torr). 3.Adjust transducer zero trimpot (Fig. 2-1) until display indicates 000 ± 001 Torr. 4.Increase system pressure to atmosphere and adjust span trimpot (Fig. 2-1) until displayindicates the known local atmospheric pressure ±001 Torr.5.Repeat steps 2 through 4 if necessary. page 13