5
the
REC
button. "
SA
" (save) and "
CA
" will appear on the screen.
•
Follow the same procedure for the negative pressure calibration point. By
pressing the UNIT button, the LCD now displays "-80.0" and a small "CA".
Save the calibration point by pressing the
REC
button. "
SA
" and "
CA
" will
appear on the screen, followed by "End" and "CA". In 2 seconds, the
meter returns to normal mode.
•
Press the
Unit
button to exit the calibration mode.
Note: If you can not save by pressing the
REC
button, check that the
calibration pressure source is between 75.0 and 85.0; and that you entered the
correct positive pressure (+) or negative pressure (-).
3-D. Auto Power Off
This unit has a built-in Auto Power Off function to prolong battery life. The
meter will power off automatically if no buttons are pressed within 20 minutes.
To deactivate this feature, press
On
and
Hold
simultaneously before power-
ing on the unit. The symbol "
n
" will appear in the middle of the screen, at which
time you can release the
Hold
button.
3-E. Battery Replacement
When the "BAT" icon appears on the right side of the LCD, open the battery
cover, install a fresh 9V battery and replace the cover. Remove the battery
during prolonged periods of non-use.
3-F. RS232 Output
The unit features an RS232 output via which can be utilized by user's specific
application. Connection procedures:
•
Connect the optional RS232 cable to the RS232 output port.
•
Plug the other end of the RS232 cable into computer's COM 1 or 2 port.
•
Install the optional RS232 Software according to the procedures in the
software package. Additional instructions are found in a separate Adobe
PDF file in the software. Be sure to set the baud rate to 2400.
3-G. Optional Accessories
•
840027 AC Adaptor
•
840054 RS232 Cable
•
840052 Software
•
840089 Rubber Holster
•
840090 Water Resistant Instrument Pouch
•
840094 USB Adaptor Cable
