Humphrey FDT User Manual
2660021149532 Rev. B 2015-11
Calibration and Set-up
4-3
Calibration
This instrument does not require scheduled calibration. The instrument calibration is
checked each time the instrument is powered ON and at the start of each test to be sure
the unit is properly calibrated. If the instrument detects the need for calibration, the
Operator LCD Display will display a Needs Calibration warning. If not calibrated when the
Needs Calibration warning is displayed, the unit will continue to operate normally until the
unit reaches the calibration limits. Once the calibration limits are reached, the unit will not
operate normally until a calibration is completed successfully. Calibration may be
performed at any time, not only when requested by the instrument.
To calibrate the instrument, select UTILITIES MENU (BOTTOM Operator Button) from the
FDT MAIN MENU and then RUN SELF-CALIBRATION (2nd Operator Button from the top) in
the UTILITIES MENU. Follow the Operator LCD Display instructions to start the calibration.
The calibration will take several minutes and requires no operator interaction during
calibration. If the calibration cannot be completed successfully, repeat the RUN
SELF-CALIBRATION sequence again (up to 3 times). If SELF-CALIBRATION cannot be
completed after 3 attempts, record the information on Operator LCD Display and contact
an authorized customer service representative for assistance.
Note: Be sure to cover the
Patient Eyepiece
with the Calibration Cap shipped with each
unit. If the Calibration Cap is not available, substitute something that will temporarily
block light from entering the Patient Eyepiece or perform the calibration in a completely
darkened room (black cloth over Patient Visor, etc.). The Operator LCD Display will
indicate if there is too much ambient light to complete the calibration.
UTILITIES MENU
SET-UP INSTRUMENT MENU
RUN SELF-CALIBRATION
INSTRUMENT TESTS MENU
ABOUT FREQUENCY DOUBLING TECHNOLOGY
24 JUN 1997 04:01 pm
