6
Calibration Standard
To check Pachymeter calibration, an electronic CalBox (below) is used to simulate the
thickness of the cornea. Instructions for using the CalBox are given in section VIII and
they are also printed on the Calbox label.
TECHNOLOGY, INC.
DGH 550 CALIBRATION BOX
OPERATING INSTRUCTIONS
1. With the
turned off, connect the probe to
the front panel.
2. Enter the CalBox mode by holding in the switch
and turning on the
.
3. After power-up is completed, the display will indicate
“CALBOX MODE” on the top line and #1 = 0u” on the
bottom line.
4. Disconnect the probe and connect the CalBox to the
.
5. Press the CalBox button until the power LED lights, and
the
will begin taking measurements.
If the LED fails to light or goes out before the test
sequence is completed, or if “POOR APPLANATION” is
displayed, replace the 9V alkaline battery.
If no measurements are taken within 2½ minutes after
the CalBox button is pressed, the CalBox will turn off.
6. Observe actual measurement values of 200
7.
Before taking any corneal measurements,
re-connect the probe and exit the CalBox mode by
pressing .
Pachette 2
Pachette 2
Pachette 2
Pachette 2
Ï
“
Important!
CLEAR
µm thru
1000µm in steps of 100µm. (Units with FLAP option start
at 100µm)
All values are based on a corneal velocity of 1640m/s
and should be within ±5µm. If any measurements are
out of tolerance, contact DGH Technology, Inc.
2
PACHETTE
Figure III-C
Electronic CalBox