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6. Common Trouble Shooting

No.

Failure

Liquid crystal

screen is not lighted

When ocular visibility
is adjusted, ocular

dividing plate cannot
he seen clearly

Drone can not be

seen

Drone is not clearly
seen

Excursion of drone
center

Shifting of
dot-making
mechanism

Reasons of Failure

Lamp is not lighted

Degree of testee’s eyes is

too deep or he (she) has
astigmatism

Lamp is lighted

Dustproof shield is not
removed

Dust on optic lens

Lock screw is loosened

Limit screw is loosened

Connecting screw is

loosened

Solutions

Switch on power

supply

Wear spectacles

Switch on power supply

Take off dustproof
shield

Clean it with absorbent
cottondipped with

cleaning solution

Take off measurement

bearing seat, and
adjust and tighten 3
lock screws

Adjust and tighten
limit screw

Adjust and tighten
connecting screw

dipped with mixed solution of ethanol and aether.

Matters Needing Attention

For cleaning the device, do not use organic solution such as paint thinner, otherwise
surface of the device will be damaged.

Содержание LM 300

Страница 1: ...USER S MANUAL LM 300 LENSMETER ...

Страница 2: ...e to use the supplied or specified power cable Do not modify forcibly bend kink or pull the power cable When disconnecting the power cable from the AC outlet be sure to hold the cable by the plug Pulling the cable may cause wire breakage or shot circuit resulting in fire or electric shock Do not connect or disconnect the plug of the power cable to from the AC outlet using wet hands Doing so may re...

Страница 3: ...Content 1 Function Introduction 4 2 Working Principle Device 4 3 Functions 5 4 Operation 8 5 Maintenance 18 6 Common Trouble Shooting 19 7 Specifications 20 ...

Страница 4: ...ght tested for spectacles This device is applicable to all level measurement testing departments spectacles manufacturers spectacles retail stores hospital s department of ophthalmology and optical elements factories for conducting measurement of spherical lens diopter of spectacles or lens diopter of cylindrical lens astigmatism axis angle of cylindrical lens diopter of bifocal lens prism degree ...

Страница 5: ...iece Set the distinct reticule images of 2 Mark Dividing Plate and 6 Eyepiece Dividing Plate can be seen During operation put spectacle lens at the place of 4 Diaphragm measurement bearing scat and turn diopter measuring hand wheel and astigmatism turning hand wheel so that distinct image of 2 Mark Dividing Plate is obtained Now the number showing on the liquid crystal display screen is just the d...

Страница 6: ...lower part of lens frame i e two lens rings shall contact the lens pushing board 7 Diameter Indication Measuring Scale When lens pushing board contacts edge of lens it is possible to read lens diameter 8 Inclining Angle Adjusting Handle of Device It is able to enable measurement user to adjust inclining angle of the device easily who can work with a comfortable posture By rotating backwards the ad...

Страница 7: ...ue of the measured lens 15 Eyepiece Dividing Plate Prism degree measuring scale and calibrated dial are marked on it Prism degree is marked with space of 1 where integral prism degree is read directly on the measuring scale and decimal prism degree is read by estimation from measuring scale Calibrated dial 0 180 is marked with space of 1 and 180º 360 with space of 5 16 Drone Distinct image of mark...

Страница 8: ...ement Switching Key S C Every time one presses this key mode of measuring spherical lens or cylindrical lens will be changed Start up of this machine defaults mode of being ready to operate 20 Adjustment Key ADJ It is used to set grade of measurement 4 Operation 4 1 Before Measurement 4 1 1 Preparation 1 Place the device on a working table with proper height to the extent that the adjusted incline...

Страница 9: ...ding plate 6 in eyepiece visual field At the same time the better way is to turn eyepiece cover in one way one way rotation can eliminate influence caused by action of eye adjustment until the black reticule digitals become clearest 4 Adjusting zero position of the device Turn diopter measurement hand wheel to focus drone to clearest state At this time the display degree of spherical lens is 0 00 ...

Страница 10: ...e facing downwards Fig 8 Fig 8 2 Lift upwards the lens pressing mechanism then lower it to press lens when measurement is over lift upwards the lens pressing mechanism again to the top end so that lens pressing mechanism is hung tightly and automatically 3 When lens on the frame is measured lower part of frame i e two lens rings should contact lens pushing board turn lens pushing hand lever to pus...

Страница 11: ...imultaneously 2 Lightly move lens so that drone is at center of eyepiece visual field Then finely regulate diopter measuring hand wheel to obtain clearest focus of drone At this time the number on the liquid crystal display screen is just the spherical diopter of this lens Fig 10 Fig 10 4 2 2 Measurement of Cylindrical Lens Cylindrical lens means astigmatism lens Usually its external surface is sp...

Страница 12: ... diopter measuring hand wheel so that round dot drone is focused distinctly 3 Lightly move lens to enable drone to be positioned at the center of eyepiece visual field 4 Turn astigmatism turning hand wheel so that two long green lines of round dot drone and cross line drone are parallel 5 Then finely regulate diopter measuring hand wheel to obtain clearest focus of two long green lines of round do...

Страница 13: ...rs Needing Attention If it is required to do light degree switching press measurement switching key then the device sends out sound of DuDu and switched value is shown whereat Fig 14 Fig 14 4 2 3 Measurement of Bifocal Lens Function of measuring bifocal lens is to check how much near vision is added to distant vision 1 According to measuring procedures of spherical lens and cylindrical lens in abo...

Страница 14: ... time diopter degree value of this bifocal lens is shown on liquid crystal display screen Fig 16 where SPH is spherical diopter and CYL is additional diopter At this time AXIS data have no meaning which can be ignored Fig 15 Matters Needing Attention Lift up lens pressing mechanism a little when moving lens Fig 16 Important Matters If drone cannot be moved to center of eyepiece visual field becaus...

Страница 15: ...stinct B Turn astigmatism turning hand wheel so that the middle one of 3 long green lines of cross line drone passes through center of eyepiece dividing plate C Prism degree and value of basal angle of prism lens are read on the eyepiece dividing plate Fig 17 Fig 17 2 basal angle 30 2 In the range of 5 20 degrees of prism prism compensator should be used A Turn diopter measuring hand wheel to obta...

Страница 16: ...pectively and the sum of both values is prism degree of this prism lens Figs 18 and 19 E Basal angle of this prism lens is read on prism compensator Fig 19 Fig 18 Fig 19 Important Matters If value of prism degree is to be read from left side of reticle 0 180º shall be added to that of basal angle of the prism lens It can be known from Fig 18 and Fig 19 that measured data of this prism lens are pri...

Страница 17: ...splay screen 2 Turn diopter measuring hand wheel to obtain distinct focus of drone 3 Move lens or use prism compensator so that the middle one of 3 long green lines of cross line drone passes through center of eyepiece visual field 4 Make 3 dot mark using dot making mechanism 4 3 4 Calibration of Optic Center of Assembled Two Lens Put spectacles on the device Choose any one of lens and turn diopte...

Страница 18: ...ossible to select the required grade of measurement Fig 20 Fig 20 5 Maintenance 1 The device has undergone precise adjustment before delivered from manufacturing plant Please do not disassemble it at random to ensure precision of the measurement 2 The device shall be used in an indoor well conditioned dry place to prevent optic elements from mildewing after affected with damp 3 After using the dev...

Страница 19: ...d is not removed Dust on optic lens Lock screw is loosened Limit screw is loosened Connecting screw is loosened Solutions Switch on power supply Wear spectacles Switch on power supply Take off dustproof shield Clean it with absorbent cottondipped with cleaning solution Take off measurement bearing seat and adjust and tighten 3 lock screws Adjust and tighten limit screw Adjust and tighten connectin...

Страница 20: ...umination Voltage Power Temperature Humidity 25D 25D 9 99D 9 99D 0 01D 0 06D 0 12D 0 25D 0 180 space of readings 1 Model A 0 5 space of readings 1 Model B 0 20 space of readings 1 0 180 space of readings 1 180 360 space of readings 5 5D 5D Φ16mm Φ80mm 320 mm L X 150 mm W X 450 mm H Model A 4 9kg Model B 5 kg Φ5 super lighting LED DC 6V 300mA 1 5W 10º C 50º C in operation 20º C 60 C in storage duri...

Страница 21: ...clusion or limitation of incidental or consequential damages Accordingly the above limitation may not apply to you Every effort has been made to ensure the accuracy of this manual However LUXVISION makes no warranties with respect to the documentation and disclaims any implied warranties of merchantability and fitness for a particular purpose LUXVISION Inc shall not be liable for any errors or for...

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