User Manual

6. Precautions
6.1. Start Time
6.3. Radar biological det ection performance
Because human biological characteristics belong to ultra-low frequency and w eak reflection character
istic signals, radar processing requires a relatively long cumulat ive processing. During t he cumulat ive
process, many factors may affect the radar parameters, so occasional det ection failure is normal.
6.4. Power
The radar module requires higher power quality than conventional low frequency circuits. When
powering the module, it is required that the pow er supply has no threshold glit ches or ripples and
that it effect ively shields the power supply noise caused by accessory equipment. The radar module
needs to be w ell grounded. Due t o the ground noise brought by other circuit s, the performance of t he
radar mod ule may even be reduced or even work abnormally; the most common cause is a shorter
detection d istance or an increased false alarm rat e.
In order to ensure the normal operat ion of the VCO circuit inside the module, t he
pow er supply requir ement for this module is + 5V- + 9V pow er supply, volt age of power supply no
less t han 5V. The external p ower supply must provide sufficient current
out put capability and t ransient response capability.
When the module starts to work when it is initially powered on, it is necessary to completely reset the
internal circuit of the module and fully evaluate the environment al noise to ensure the normal operation
of the module. Therefore, when the module is initially powered on, it needs a st artup st ability time of ≥20s
to ensure the validit y of subsequent output parameters.
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