RF Exposure Info

FCC ID: I28RFID-R170XI-02

RF Exposure Info

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FCCID_441526

RF Exposure Exhibit for Zebra I28RFID-170XI-02 Printer

Since the EUT only transmits when it receives a signal from the computer, normal
operation during transmission would have the user sitting at the computer, not touching
the printer. There are no buttons on the device to make it transmit. This means a
distance of at least 20 centimeters is normally maintained between the transmitter’s
radiating structure and the body of the user or nearby persons. Therefore, this device is
classified under section 2.1091 as a “mobile” device.

Although this device is categorically excluded from RF exposure evaluation under Part
2, it can be shown that the device meets the limits used for evaluating other devices
(those which are not excluded) under this section. Section 2.1091 for mobile devices
states that the limits are given in 1.1310. The limit given in 1.1310 for general
population at 902 MHz is a Maximum Permissible Exposure (MPE) limit of (f/1500)
mW/cm2.

For 902 MHz this limit is 0.601 mW/cm2.

The FCC OET Bulletin 65 Section 2 can be used to determine compliance with
guidelines for human exposure to RF radiation. We will use equation 3 of that section
for predicting RF fields.

The highest power measurement for this device is 25.81 dBm.
For this prediction we will use a worst-case power of 26 dBm or 400 mW.
Since the device is “mobile”, we will use a worst-case distance of 20 cm.
For worst-case antenna gain, we will use a gain of one.

Using equation 3 of OET Bulletin 65 Section 2, the power density is calculated to be
0.08 mW/cm2. This is well within the limit given in 1.1310.

Document Created: 2004-06-17 08:47:42
Document Modified: 2004-06-17 08:47:42

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