M88B Testing User Manual
Ⅰ. Attentions While Using JRT Laser Distance Sensor
Thank you for choosing JRT as your supplier. Before start to test, please read the user
manual carefully and pay special attention to the following points. If there’s something not
clear for you, please contact our related people or after-sales technicians by email
(ly@jrt-measure.com).
1. Do not touch the modules by bare hands. Electrostatic protection is required. Please wear
static gloves or bracelets in case of any damage to the laser diode or other electronic
components.
2. Do not connect power cord reversely and make sure there’s no connection between
positive pin and negative pin anywhere of the module, for there’s no anti-reverse protection
for modules. Charge with the constant electric current and the constant voltage required in the
User Manual. Please note the voltage can not be over DC3.3V and the current should be over
300mA at the same time. If the DCDC module is used to step-down power supplies, please
note that JRT uses TTL 3.3V, which means the maximum allowed voltage of RX and TX
signal cable is 3.3V. Suggested power supply is DC3.0V.
3. The module’s TXD/RXD pins are in open drain state without built-in pull-up resistors and
RX/TX requires a pull-up resistor of 10K. We can customize the module with pull-up resistor,
please contact us for details.
4. The module should be used under LUX200. The measured objects should have a better
reflection of 70%. The performance will be degraded in hard light condition, please pay
attention to protect lens .
5. Keep our laser sensors away from water and heavy dust. The performance would be
affected if dust gets into lens. It is recommended making housing for dust protection if it’s
necessary.
6. In standard atmospheric pressure environment, the working humidity of the module is less
than 85% and the temperature is within 0~40°C. The storage humidity is less than 60% within
0~30°C. When using under low temperature conditions, please attention to the phenomenon
of water condensation. Make sure the surface is free of frost and water droplets.
7. The module should avoid stress during use. The optical part and the electronic components
on the PCB cannot bear the stress. The structure cannot be repaired if pads or other optical
components are damaged due to stress.
8. Do not point the laser directly to sunlight, extra-strong light or something high reflective
surfaces. If you measure high-gloss materials within 10m, the hardware of module will be
damaged, which will cause the module not working and can not be repaired.
9. Do not over tighten the screws when installing the module. The pressure on the optical
components will affect the performance of the module. The center hole of the U series and M
series is only positioning hole which cannot be used for screwing installation and fixation.
10. Do not change the module structure and components by yourself. If you have special
needs, please contact us.
11. For lens protection and cleaning, please refer to the camera lens. Under normal
circumstances, please gently blow off dust; if you need to wipe the lens, please use a special
lens paper to wipe the surface in one direction; if you need to clean the lens, please use a
cotton swab dipped in a little pure water to wipe in one direction, and then dry with a lens
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