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© Haag-Streit AG, CH-3098 Koeniz, Switzerland
1500.7006000.04101
AT 900 C/M AT 900 M/Q AT 900 BQ
AT 870
33
6
0
6
Appendix B Maintenance
B.
Check tonometers AT 900
This check should be made 1 x per month. In case the check
shows errors:
1. Is the measuring prism properly inserted?
2. Is the check weight precisely adjusted?
3. Repeat check procedure!
Faulty equipment is to be returned immediately to the Haag-
Streit distributor.
NOTICE
Haag-Streit provides a repair and service package. For further
information please contact us directly.
Check at measuring drum setting 0
Check position - 0.05
Turn the zero calibration on the measuring drum downwards
by the width of one calibration marking, against the index
marker. When the feeler arm is in the free movement zone, it
should then move itself against the stop piece in the direction
of the examiner.
Check po 0.05
Turn the zero calibration on the measuring drum upwards by
the width of one calibration marking, against the index mar-
ker. When the feeler arm is in the free movement zone, it
should then move itself against the stop piece in the direction
of the patient.
Check at measuring drum setting
CAUTION This is the most important check
procedure, as the measuring of the ocular pres-
sure in this area is highly significant.
For this control procedure the check weight is used. Five circles
are engraved on the weight bar. The middle one corresponds
to drum position 0, the two immediately to the left and right to
position 2 and the outer ones to position 6.
One of the marks on the weight corresponding to drum position
2 is set precisely on the index mark of the weight holder.
Holder and weight are then fitted over the axis of the tonome
-
ter (33) so that the longer part of the weight points towards
the examiner.