BIOLINE Manual for installation and use
OPTIKON 2000
8.8 PROBE TEST
It is possible to carry out a test to check the functioning of the probe and the
accuracy of the biometric measurement. To this end a small tube of transparent
plastic 149001 is supplied on which the value of the measurement test is indicated in
millimetres together with the tolerance (+/-0.1mm.)
N.B.:
The tube material (plexiglas) is subject, like all materials, to thermal expansion. Consequently the
value indicated on the tube refers to a tube surrounding temperature of between 20 °C.
and 25 °C.
For values of below 20°C, 01mm must be subtracted from the nominal value indicated on the label.
For values higher than 25°C, 0.1 mm must be added to the nominal value indicated on the label.
E.g.: If the value indicated on the label is 20.8 mm and the surrounding temperature is higher than 25
°C.,
the
reference value becomes 20.9 mm. Taking into account the tolerance of +/- 0.1 mm, we
should expect an indication on the instrument of between 20.9+0. 1=21.Omm and 20.9-0.1=20.8 mm.
Under no circumstances must the temperature of the tube exceed 30°C because in
this circumstance the attenuation of the signal does not allow automatic acquisition.
The recommendation is therefore to place the tube on a flat surface without handling
it or holding it back with the fingers for the strict time required for the measurement.
The procedure to be followed is as indicated below:
1) Enter the A-SCAN session (by pressing the A-SCAN key).
2) Cancel all the measurements (by pressing CLEAR twice)
3) Select the amplification GAIN=MED-HIGH
4) Select the aphakic mode MODEAPHAKIC
5) Place a drop of ultrasound gel on the surface of the probe and smooth it out
on the tube.
6) Activate acquisition by pressing the A-SCAN key or footswitch
If the alignment is correct you will obtain an echo of maximum width with the
consequent automatic acquisition of the measurement. If the width of the echo was
not sufficient for "autofreeze”, try to set GAIN= HIGH and if possible MAX. Check that
AXL (or AVG in the event of several consecutive measurements) complies with the
tube reference value.
At the end of the test reset MODE and GAIN in the normal way.
Code 141002EN 8-8 26.10.05 Rev.0
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