User's Manual

User Manual
XC2907-A Portable Reader
34
In general condition, it is impossible to accurately predict the performance
of portable reader system performance in any given environment due to the
complexity of electrical magnetic radiation, including the frequency stability
of signal source, directional diagram and sidelobe problem of antenna,
ambient environment, etc.). But, some suggestions given below can guide the
optimization of system performance in specic environment and application
conditions.
● In consideration of RF characteristics, including the building materials,
oce hours, conguration condition of window and pipeline, RF eld mode
and read distance may be inuenced by the adjacent metal objects, such as
household appliance, equipment, metal framework, etc.
● Ensure that the objects which are to be recognized and contain electronic tag,
remain in the eective reading area of portable reader for no less than 100ms.
● The length of antenna with the best electronic tag is related to the sealed or
embedded nonconductive materials. Basic concept: For the electronic tag
embedded in non-conductors (dielectric constant is larger than that in air,
causing that the eective wavelength in medium is shorter than the eective
wavelength in air), if its eective electrical length is adjusted to the optimum
length in air (farthest from the red distance of portable reader), the electrical
length of tag antenna shall be adjusted toward the shrinkage direction when
electronic tag is put in non-conductor or on substrate in order to reach the
best eect equal to that in air. On the contrary, if the eective electrical
length of electronic tag antenna is adjusted to the best electrical length in the
non-conductor medium, the best electrical length in the air shall be adjusted
toward the direction electrical length increase.
● The exposed and unpackaged electronic tag isn't allowed to contact chemical
medicines. Some chemicals, such as ethyl alcohol, would not inuence
electronic tag at normal temperature, but will corrode electronic tag at high
temperature.
9. Daily maintenance and troubleshooting