BS ISO 8600-3:2019 pdf free
BS ISO 8600-3:2019 pdf free.Endoscopes一Medical endoscopes and endotherapy devices.You can click here to download.
Method A applies only if the measuring distance is at least 30 times larger than the distance between the distal end and the entrance pupil[1] and the accuracy requirement in ISO 8600-1 is satisfied. Otherwise,the error caused by the distance between the distal end and the entrance pupil in Method A will lead to a systematic measurement error.
Method B may be used at any distance. In general, any method is allowed which has the entrance pupil as reference. Details about test Method A and Method B for measuring endoscope field of view and direction of view, including their shortcomings, accuracies, application prerequisites (e.g. endoscopes with a close focus distance and capsule endoscopes should only use Method B), etc, can be found in the reference[1].
a) Mount the target into the target holder. Adjust target in such a way that its perpendicular line through its centre intersects the centre of rotation stage.
b) Mount the endoscope to be tested in the endoscope holder in such a manner that the centre of the distal window is 50 mm±0,2 mm from the target centre. Adjust the endoscope in a way that its entrance pupil (if unknown, distal window) is at the centre of the rotation stage.
c) If the depth of field of the endoscope does not include 50 mm, then the endoscope should be mounted at the measuring distance specified by the manufacturer±1 % from a target designed to measure the field of view at that measuring distance. Record the measuring distance.
d) Adjust the endoscope holder by looking through the endoscope so that the circles marked on the target and the circumference of the field of view is centred.
e) Determine the largest viewed circle and record it as the field of view, in degrees. For a non-circular image, only segments of the largest circle may be visible.
f) Read and record as the direction of view the angular position, in degrees, of the protractor relative to the long axis of the insertion portion of the endoscope.BS ISO 8600-3 pdf free download.
