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4.8 Measuring Power Consumption
4.9 Antenna Precautions
23
Figure 4. Hyper Terminal Hardware Test report
The board allows measuring power consumption of the ZigBit module. To perform the
measurements, simply connect ammeter to the clamps denoted as CM+ and CM- and
remove jumper J1. Make sure that the board is powered by batteries only. However,
such measurement would not be absolutely correct, because power is consumed by
the interfaces and the peripherals connected to ZigBit. To measure power
consumption correctly, all interfaces should be disconnected from ZigBit module,
excluding RF ports. Refer to the Application Note [6] for details.
Each type of antenna – namely, PCB antenna, dual chip antenna and external
antenna – were matched and tuned, with taking into account all adjacent
components, including the ZigBit module shield, battery compartment and plastic
legs. Any object approached or put closely next to antenna affects its performance.
Do not put the module into enclosure. Do not mount the board on metal surface. Do
not use metal screws over 5 mm long to fasten the board legs. These factors would
affect antenna performance.
Mount plastic legs from bottom side only, next to the battery compartment). Use
plastic screws to fasten the legs. Do not use the legs made of different plastic
composite. Omitting these plastic legs would significantly affect antenna performance.
ATZB-EVB-XXX-XXX User Manual
AVR-09-2011
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