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2. PRECAUTIONS
Regarding portable premises radio equipment and portable specified low-power radio equipment:
• Before starting transmission, check that operation will not take place within the vicinity of portable
premises radio equipment or specified low-power radio equipment.
• In the case that the instrument causes radio interference with portable premises radio equipment,
terminate the connection immediately and take measures to prevent further interference (e.g. connect
using an interface cable).
• In the case that the instrument causes radio interference with portable specified low-power radio
equipment, contact your local dealer.
When using Bluetooth function in proximity to IEEE802.11b/IEEE802.11g/IEEE802.11n/
IEEE802.11ax
standard wireless LAN devices, turn off all devices not being used.
• Interference may result, causing transmission speed to slow or even disrupting the connection
completely. Turn off all devices not being used and vice versa.
Do not use the RL-HV in proximity to microwaves.
• Microwave ovens can cause significant interference resulting in communication failure. Perform
communication at a distance of 3m or more from microwave ovens.
Refrain from using the RL-HV in proximity to televisions and radios.
• Televisions and radios use a different frequency band to Bluetooth communications.
However, even if the RL-HV is used within proximity to the above equipment with no adverse effects
with regard to Bluetooth communication, moving a Bluetooth compatible device (including the RL-HV)
closer to said equipment may result in electronic noise in sound or images, adversely affecting the
performance of televisions and radios.
Precautions regarding transmission
For best results
• The usable range becomes shorter when obstacles block the line of sight, or devices such as
PDAs or computers are used. Wood, glass and plastic will not impede communication but the usable
range becomes shorter. Moreover, wood, glass and plastic containing metal frames, plates, foil and
other heat shielding elements as well as coatings containing metallic powders may adversely affect
wireless communication and concrete, reinforced concrete, and metal will render it impossible.
• Use a vinyl or plastic cover to protect the instrument from rain and moisture. Metallic materials should
not be used.
• The direction of the Bluetooth antenna can have adverse effects upon usable range.
Reduced range due to atmospheric conditions
• The radio waves used by the RL-HV may be absorbed or scattered by rain, fog, and moisture from the
human body with the limit of usable range becoming lower as a result. Similarly, usable range may also
shorten when performing communication in wooded areas. Moreover, as wireless devices lose signal
strength when close to the ground, perform communication at as high a position as possible.
• TOPCON CORPORATION cannot guarantee full compatibility with all Bluetooth products on the market.
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