User's Manual

CONFIDENTIAL

Appendix A : HRM3300 Placement Guideline

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The electrical noise generates from the machine could affect the reception range of 5KHZ

wireless receiver. It is better to avoid any noise frequency near 5KHZ or harmonics get near

the module.

Although not all electrical noise can be avoided, the following sources could contribute to the

interference. It is recommended to position the HR wireless module as far from these sources

as possible.

x LED display

x Electrical fan

x Audio speaker

x Magnetic field

x Piezo buzzer/beeper

x Magnetic brake (Bike)

x External/ internal CD player

x Excessive ripple noise on power supply

x Switching power supply

x Motor controller

x Sound or noise source in audio band (20HZ~20KHZ)

x Cell phone

An incorrect wireless coil orientation placement will affect the range. The orientation of the

receiving coil on the HRM wireless module should be in horizontal or parallel with the

transmitter’s coil to obtain the optimal performance.