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Optical-Interference Testing Rig

for Applanation Tonometers

PT-Series

Design and Operation

Major Performance Features

Our PT-Series optical interference testing rig for applanation

tonometers consists of an automated laser based testing device

equipped with a USB interface for coupling to a PC, plus signalprocessing

software running on standard PCs/notebook

computers. Its flexibility of configuration allows its use with various

types of tonometers. The buckling force set on the tonometer to

be tested is automatically recorded over its full travel. Detecting

the limits of the tonometer's travel allows outputting both its

buckling force characteristic curve over its full travel and the

buckling force at the midpoint of its travel, as stipulated by testing

regulations.

The force sensor employed is an optical interferometric device

with a measurement range of 100 mN and a resolution of

0.01 mN. To test a tonometer, the tonometer is driven up against

this force sensor by an electromechanical drive, where the

measured buckling force characteristic curve is employed

internally for controlling the motions of the drive and detecting the

limits of the tonometer's travel. The measured value of the

buckling force at the midpoint of the travel is then compared with

the prescribed tolerance range and displayed either in green,

indicating that it falls within that range, or in red, indicating that it

falls outside that range. A complete series of measurements,

including printing the calibration certificate, takes less than five

minutes, thanks to the fully automated test procedures of the rig.

The facilities provided for calibrating its optical interference force

sensor using standard weights allow tracing its calibration back to

national reference standards.

• Allows making orientation independent force

measurements by laser interferometric force

sensor over the full measurement range while
maintaining compliance with tolerated error limits.

• Provides automated test procedures complying

with ISO 8612 testing regulations for

applanation tonometers (determinations of

both buckling forces at the midpoints of their

travels and hysteresis).

• Diagram of tonometers' buckling-force characteristic

curves over their full travels

• The first rig to allow the testing of tonometers

over the full prescribed temperature range of

15°C to 30°C.

• Testing, including setup, takes only about

10 min.

• Printout of a calibration certificate

• Calibration using standard weights allows tracing

its calibration back to national standards.

• The rig is portable, and thus may be used onsite

e.g. at hospitals or ophthalmologists' offices.

• Certification by German calibration authorities

has been granted.

Technical Data

Applications

Suitable for use with all types of applanation tonometers.

Measurement range: 0 ... 10 g (100 mN)

Resolution: 1 mg (0.01 mN)

0.1 mg internally

Standard calibration error

of the force sensor employed: < 0.5 mg (0.005 mN)

Test duration: ¡¤¤µ min

Laser Safety Class

acc. DIN EN 60825-1 2M

Dimensions (H x W x D)

• Testing rig: 360 mm x 390 mm x 190 mm

• Electronics module: 150 mm x 240 mm x 400 mm

• Conducting metrological accuracy checks on

applanation tonometers in accordance with

?11, section 3, MPBetreibV, both in the

laboratory and on-site at remote locations.

• Testing tonometers for compliance with the

EN ISO 8612 testing standard.

• Quality control testing during tonometer

manufacture.