Sper Scientific 840085 Manometer - 2 PSI - Manual (Page 5)

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 Negative calibration.
 Connect tube to the negative pressure connector.
 Turn ON the manometer.
 Hold button for ZERO calibration.
 Set the calibrator to 80.00 PSI.
 Check manometer readings. If it is not within specs, enter the calibration
mode by pressing POWER and REC buttons simultaneously.
 Press UNIT button to enter negative calibration mode.
 Press REC button to save calibration point.
 Check the readings against the calibrator. Readings should be -80.00 PSI.
 Turn OFF the manometer.
 Calibration is complete.
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. USB Output
The unit features a USB output via which can be utilized by user's specific
application. Connection procedures:
 Connect the optional USB cable to the USB output port.
 Plug the other end of the USB cable into computer's COM 1 or 2 port.
 Install the optional USB Software according to the procedures in the soft-
ware 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 ~ 840089 Rubber Holster
~ 840054 USB Cable ~ 840090 Water Resistant Instrument Pouch
~ 840052 Software