SMC Networks D3USG Manual De Usuario
ANSI C63.17-2006
Methods of Measurement of the Electromagnetic and Operational Compatibility of UPCS Devices
These controlled RF paths may be realized either as “radiated” (through space) or “conducted” (over
coaxial cable) paths. In the radiated case, the tests must be performed in a facility with controlled RF
propagation characteristics, so that the path loss can be controlled by varying separation between
transceiver and monitoring/source antennas. In the conducted case, the tests can be performed anywhere
there is adequate shielding to prevent external interference from affecting the test results. Signals can be
combined and distributed using passive networks (e.g., hybrids, RF attenuators, Butler matrices,
coaxial cable) paths. In the radiated case, the tests must be performed in a facility with controlled RF
propagation characteristics, so that the path loss can be controlled by varying separation between
transceiver and monitoring/source antennas. In the conducted case, the tests can be performed anywhere
there is adequate shielding to prevent external interference from affecting the test results. Signals can be
combined and distributed using passive networks (e.g., hybrids, RF attenuators, Butler matrices,
directional couplers). Path loss can be controlled with RF attenuators.
This clause provides guidance on implementation of the conducted and radiated measurements of transmit
power and monitoring threshold. Supporting derivations are given in Annex B.
Conducted tests are preferred to radiated tests, and should be used for tests not affected by antenna
selectivity if the EUT antenna can be detached for testing purposes. If the EUT antenna or antennas are
replaced by a direct connection, the connection should be made in an impedance-matched fashion so that
matching losses relative to the antenna connection are less than 2 dB.
This clause provides guidance on implementation of the conducted and radiated measurements of transmit
power and monitoring threshold. Supporting derivations are given in Annex B.
Conducted tests are preferred to radiated tests, and should be used for tests not affected by antenna
selectivity if the EUT antenna can be detached for testing purposes. If the EUT antenna or antennas are
replaced by a direct connection, the connection should be made in an impedance-matched fashion so that
matching losses relative to the antenna connection are less than 2 dB.
4.1
Test facilities and equipment
Tests should be performed at the manufacturer's recommended normal operating temperature and voltage.
Unless stated otherwise, the requirements of ANSI C63.4-2003 apply to the test facilities, including the site
design, dimensions, and validation. Additional site validation requirements above 1 GHz are currently
under development. Portions of this standard place requirements on the test facilities, in addition to the
general requirements of ANSI C63.4-2003.
When shielding facilities (shielded room, semi-anechoic chamber or anechoic chamber) are used for
operational compatibility testing, the shielding effectiveness of the room shall be such as to ensure
compliance with electromagnetic emission limits for the environment outside of the room and reduce the
ambients penetrating into the room to levels at least 10 dB below the weakest measured signal.
When the free-space test environment is simulated, the reflections from the facility confines, as well as the
reflections from any extraneous objects at the test site, must be reduced to levels at least 10 dB below the
direct (free-space) signal.
design, dimensions, and validation. Additional site validation requirements above 1 GHz are currently
under development. Portions of this standard place requirements on the test facilities, in addition to the
general requirements of ANSI C63.4-2003.
When shielding facilities (shielded room, semi-anechoic chamber or anechoic chamber) are used for
operational compatibility testing, the shielding effectiveness of the room shall be such as to ensure
compliance with electromagnetic emission limits for the environment outside of the room and reduce the
ambients penetrating into the room to levels at least 10 dB below the weakest measured signal.
When the free-space test environment is simulated, the reflections from the facility confines, as well as the
reflections from any extraneous objects at the test site, must be reduced to levels at least 10 dB below the
direct (free-space) signal.
The diagram in Figure 1 lists the types of test facilities that may be used for measurements specified in this
standard.
In all cases, the test facilities and equipment must be fit for the purpose of measuring the parameters and
operations of the EUT according to the requirements of 47CFR15, and in accordance with good
engineering practice.
7
A Butler matrix is a network of 3 dB hybrids that provides a passive combining/splitting function for coupling multiple RF inputs to
multiple RF outputs.
8
Use ambient conditions unless otherwise specified as in Table 7. Nominal mains voltage of 115 V (ac) (or fresh battery pack as
appropriate) may be used.
9
To check for reflections or other influence from nearby objects move the EUT one-quarter-wavelength relative to the structure,
repositioning the measurement antenna or probe, so as to keep the same relative spacing between the EUT and measurement antenna
or probe. Compare the results. The EUT may also be reoriented by 45° or 90° and measured.
or probe. Compare the results. The EUT may also be reoriented by 45° or 90° and measured.
The RF ambient and instrumentation noise floor shall be > 20 dB below the intended measurement limit.
If it is not practical to measure the reflection loss, then the two-wavelength spacing rule may be used. By this rule, all potentially
reflective objects are kept greater than two wavelengths away from the EUT.
reflective objects are kept greater than two wavelengths away from the EUT.
7
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