Cooper Instruments & Systems DPG 100 Digital Pressure Test Gage - Manual (Page 18)

• Remove the center screw from the rear of the unit and gently remove the electronics from the housing.
Apply power via the integral cable and run to an appropriate instrument.
• FORCE ZERO -Select the Analog Output Zero Scale ("A-LO) menu item by following the directions in
"FIELD SELECTABLE FEATURES" in Chapter 6. When the display says "DONE", the microprocessor has
forced the analog output to 0 VDC or 4 mA.
• TRIM ZERO -Use the zero potentiometer to trim the analog out- put zero reading (0 VDC or 4 mA).
• FORCE SPAN -Select the Analog Output Full Scale ("A-HI”) menu item by following the directions in
"FIELD SELECTABLE FEATURES" in Chapter 6. When the display says "DONE", the micro- processor
has forced the analog output to 5 VDC or 20 mA.
• TRIM SPAN -Use the span potentiometer to trim the analog output full scale reading (5 VDC or 20 mA).
• Repeat steps 2 through 5 until the zero and span readings are trimmed.
• Turn the unit off, then turn the power supply off and disconnect the "+SUPPLY" of the instrument from the
power supply.
• Insert the electronics back into the housing of the instrument and install the screw into the rear of the
device.
• Connect power supply back to the instrument and apply power to verify operation. Trimming of the analog
output is now complete.
Figure 5-7: Analog circuit board trimming diagram
CHAPTER 6 FIELD SELECTABLE FEATURES
6.1 Introduction
This chapter discusses the field selectable features available on the Digital Pressure Gage. These features can be
activated, deactivated and modified via the Setup Menu accessed by the front panel.
These field selectable features include:
Setting the low limit setpoint
Setting the high limit setpoint
Enabling the automatic power off feature to conserve battery life
Disabling the front panel buttons
Changing the engineering units used by the display
Forcing the analog output to 0 Volts or 4 mA
Forcing the analog output to 5 Volts or 20 mA
Displaying the program version
6.2 Setup Menu Operation
All of the field selectable features are accessed via the Setup Menu. This section discusses its operation.
DPG 100 15 Rev Feb 2001