SMC Networks D3USG Manual De Usuario
ANSI C63.17-2006
Methods of Measurement of the Electromagnetic and Operational Compatibility of UPCS Devices
Annex B
B.1
B.1.1
B.1.2
B.1.3
(informative)
Radiated and conducted measurement of power output and monitoring
thresholds
This appendix contains background material to support the procedures in Clause 4 of this standard.
General
To measure relative values of the electromagnetic compatibility (EMC) and operational compatibility (OC)
test signals, or to sample the signal for further relative analysis, measurements can be performed at
noncalibrated test facilities.
test signals, or to sample the signal for further relative analysis, measurements can be performed at
noncalibrated test facilities.
Detachable antennas
If sample EUTs can be tested with connections provided by the manufacturer in place of antennas or if the
EUT has detachable antenna(s),
EUT has detachable antenna(s),
then conducted measurements are preferred. Conducted measurements do
not require a facility that complies with the requirements of ANSI C63.4-2003. In addition to the conducted
measurements of emissions power and monitoring threshold, radiated tests of the EUT transmit antenna
gain and the EUT transmit and monitoring system coverage equivalency may be necessary. If so, the EUT
antenna-related parameters should be tested as recommended by IEEE Std 149-1979, or equivalent
documents. As a rule, the radiated measurements must be performed at a test facility that meets the free-
space requirements as set forth in Clause 6. To measure absolute values of conducted test signals,
noncalibrated signals can be used. To measure absolute values of radiated signals, calibrated test facilities
must be used.
measurements of emissions power and monitoring threshold, radiated tests of the EUT transmit antenna
gain and the EUT transmit and monitoring system coverage equivalency may be necessary. If so, the EUT
antenna-related parameters should be tested as recommended by IEEE Std 149-1979, or equivalent
documents. As a rule, the radiated measurements must be performed at a test facility that meets the free-
space requirements as set forth in Clause 6. To measure absolute values of conducted test signals,
noncalibrated signals can be used. To measure absolute values of radiated signals, calibrated test facilities
must be used.
Nondetachable antennas
Radiated measurements of the EMC and OC characteristics must be performed on equipment with
nondetachable antennas even when the EMC and OC performance limits are specified in terms of
conducted units, if sample EUTs cannot be tested with connections provided by the manufacturer in place
of antennas. In this case, the radiated test results obtained must be correlated with specified conducted
limits. When necessary, the EUT antenna-related parameters should be tested as recommended by
IEEE Std 149-1979, or equivalent documents. As a rule, the radiated measurements must be performed at a
test facility that meets the free-space requirements as set forth in Clause 4.
nondetachable antennas even when the EMC and OC performance limits are specified in terms of
conducted units, if sample EUTs cannot be tested with connections provided by the manufacturer in place
of antennas. In this case, the radiated test results obtained must be correlated with specified conducted
limits. When necessary, the EUT antenna-related parameters should be tested as recommended by
IEEE Std 149-1979, or equivalent documents. As a rule, the radiated measurements must be performed at a
test facility that meets the free-space requirements as set forth in Clause 4.
Alternative test facilities, measurement techniques, and test site validation
The preferred radiated test environment is free space. In a simulated free-space environment, there are no
requirements for the ground plane of the facility. Alternative test environments and techniques are also
permitted, provided their correlation with the preferred methods can be demonstrated. If the test methods
are not given in this standard, the procedures recommended by ANSI C63.4-2003 and other applicable
standards shall be used. When TEM cell-based test facilities are used (e.g., a wideband
requirements for the ground plane of the facility. Alternative test environments and techniques are also
permitted, provided their correlation with the preferred methods can be demonstrated. If the test methods
are not given in this standard, the procedures recommended by ANSI C63.4-2003 and other applicable
standards shall be used. When TEM cell-based test facilities are used (e.g., a wideband
TEM cell), the measured quantity is not field strength but rather radiated power. In this case, the
computation of radiated parameters must be performed according to the facility manufacturer’s instructions
and correlated with free-space measurements. Test site validation documentation must be provided in the
test report, demonstrating the required ratio of direct and reflected signal components for approximating the
free-space environment or correlation with recommended methods for alternative techniques (e.g.,
a wideband TEM cell).
computation of radiated parameters must be performed according to the facility manufacturer’s instructions
and correlated with free-space measurements. Test site validation documentation must be provided in the
test report, demonstrating the required ratio of direct and reflected signal components for approximating the
free-space environment or correlation with recommended methods for alternative techniques (e.g.,
a wideband TEM cell).
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Detachable antenna(s), if provided as a standard configuration, shall be in conformance with the requirements of 47CFR15.203.
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