User`s guide

14
68E34 41 Rev.G
Setup (continued)
Calibration Procedure
The Tono-Pen XL unit is internally calibrated, thus the instrument
calibration should be checked only before the rst use each day or in
the event of unanticipated readings. Calibration must be routinely and
successfully performed once daily prior to instrument use. Calibration
should also be performed whenever it is indicated by the LCD display,
when batteries are replaced, or after an unsuccessful calibration. It is
not necessary to check calibration prior to each use.
1. Point the transducer end of the Tono-Pen straight down towards the
floor. Refer to Figure 5.
2. Depress the Operator’s Button two times rapidly. The time between
the first and second button press must be between 0.5 and 1.5 sec-
onds. The Tono-Pen will “beep” and display [CAL].
3. Wait approximately 15 seconds for the Tono-Pen to “beep”. The
display will change from [CAL] to [UP].
4. Immediately (within 1 second) invert the Tono-Pen smoothly, pointing
the transducer end straight up. Refer to Figure 5.
5. A properly functioning Tono-Pen will display [Good] followed by a
“beep”.
6. Repeat this Calibration Procedure if [bAd] is displayed.
7. After Good is displayed, depress the Operator’s Button one time
and the Tono-Pen will display [8.8.8.8], followed by a single row of
dashes, [- - - -], and then by a double row of dashes [====] followed
by a “beep” tone, indicating the instrument is ready to measure IOP
(Depressing the activation button a second time will interrupt this
process and send the unit to calibration mode).
Figure 5 Calibration Procedure - Up - Down