Calibration Check - Clement Clarke Perkins Mark 3 Manual De Instrucciones

11. Calibration Check

11. Calibration Check
Regular calibration of the Tonometer is advised.
Please see 7.3 Special Precautions
Regular calibration of the Tonometer is advised.
Proceed as follows:-
Please see 7.3 Special Precautions
1. Insert the doubling prism (Fig 1, 5) into the prism holder (Fig 1, 4).
Proceed as follows:-
Check for zero position
1. Insert the doubling prism (Fig 1, 5) into the prism holder (Fig 1, 4).
2. Adjust the milled thumb-wheel (Fig 2, 8) so that the scale reading is below zero by the
full thickness of one scale line. Whatever the angle of the instrument in the hand the prism
Check for zero position
should tend towards its backward position.
2. Adjust the milled thumb-wheel (Fig 2, 8) so that the scale reading is below zero by the
full thickness of one scale line. Whatever the angle of the instrument in the hand the prism
3. Set the scale reading above zero by the full thickness of one scale line. The prism should
should tend towards its backward position.
tend towards its forward position regardless of the angle of the tonometer.
3. Set the scale reading above zero by the full thickness of one scale line. The prism should
Check at the 2 g position
tend towards its forward position regardless of the angle of the tonometer.
4. To make a rough check adjust the milled thumb-wheel (Fig 2, 8) so that the scale reading
is below the 2 mark by the full thickness of one scale line. Place the instrument on a flat
Check at the 2 g position
horizontal surface with the setting block under the body and the prism cone upwards as
4. To make a rough check adjust the milled thumb-wheel (Fig 2, 8) so that the scale reading
shown in Fig 15. Place the 2 g weight, recess downward, centrally on the prism cone and
is below the 2 mark by the full thickness of one scale line. Place the instrument on a flat
check that it carries the prism positively down to its lowest position.
horizontal surface with the setting block under the body and the prism cone upwards as
shown in Fig 15. Place the 2 g weight, recess downward, centrally on the prism cone and
5. Also, as a rough check, set the scale reading above the 2 mark by the full thickness of the
check that it carries the prism positively down to its lowest position.
scale line and place the instrument on the setting block as before. Place the 2 g weight on
the prism and check that it remains in its highest position.
5. Also, as a rough check, set the scale reading above the 2 mark by the full thickness of the
(If the prism is accidentally pushed down to its lowest position with the weight on the
scale line and place the instrument on the setting block as before. Place the 2 g weight on
prism, it should rise again to its highest position and freely remain there).
the prism and check that it remains in its highest position.
Weight
Setting
Block
Setting
Block
Fig 15
If desired, the Actual point of balance can be established by adjusting the milled
Fig 15
thumb-wheel (Fig 2, 8) until the prism floats at the calibration-position (rim of prism holder
level with, or not more than 1 mm above the case surface).
If desired, the Actual point of balance can be established by adjusting the milled
thumb-wheel (Fig 2, 8) until the prism floats at the calibration-position (rim of prism holder
level with, or not more than 1 mm above the case surface).
en
en
2
2
30
30