IEEE C63.4A-2017 pdf free download – American National Standard for Methods of Measurement of Radio- Noise Emissions from Low-Voltage Electrical and Electronic Equipment in the Range of 9 kHz to 40 GHz.
Annex D is changed as shown. Some of the changes include the following:
New Table D.1 is added in D.1, and new Table D.2 is added in D.2.4.
Subheadings D.2.1 to D.2.4 are added in D.2.
In D.2.1 (formerly D.2), Equation (D.1) is updated and replaced by Equation (D.1) and Equation (D.2).
The existing Equation (D.2) is renumbered as Equation (D.3).
New subheadings D.3.1 to D.3.4 are added in D.3.
The NOTE at the end of the existing D.3 of ANSI C63.4-2014 is moved to the end of D.3.3.
The last paragraph (before the NOTE) of the existing D.3 of ANSI C63.4-2014 is updated and moved to the new D.2.5.
Insert new D.7, and renumber the existing D.7 of ANSI C63.4-2014 as D.8.
The existing Table D.1 of ANSI C63.4-2014 is split into four tables as Table D.3 through Table D.6 (see associated editing instructions in D.8).
The existing Table D.2 through Table D.7 of ANSI C63.4-2014 are renumbered (also with updates) as Table D.7 through Table D.12 (see associated editing instructions in D.8).
Footnotes are inserted, and any following this annex should be renumbered accordingly.
Annex D
(normative)
Validation of radiated emissions emission standard test sites
(30 MHz to 1 GHz)
NOTE—In this annex, for contiguous readability of body text, all tables (except Table D.1 and Table D.2) and figures are placed in their own subclause following the text subclauses, i.e., entitled D.8 Tables and figures for Annex D.
D.2 NSA measurements: Basic procedure
D.2.1 General
Two antennas are set up on the test site in an appropriate a specific geometry as shown illustrated in Figure D.1 and Figure D.2 (see D.8); Figure D.2 is an illustration for dipoles only–the actual geometry requirements are in D.2.3. The NSA procedure requires two different measurements of the voltage received V R . The first reading of V R is with the two coaxial cables, including any added impedance matching attenuators whose insertion losses are not included with the antenna factors (if used), disconnected from the two antennas and connected to each other via an adapter. The second reading of V R is taken with the coaxial cables, including any added impedance matching attenuators (if used), reconnected to their respective antennas and the maximum signal measured with the receive antenna scanned in height (Heirman [B20]). For both of these measurements, the signal source generator voltage level V I is kept constant. The first reading of V R is called V Direct and the second reading is called V Site . These voltages are used in Equation (D.1) for or Equation (D.2) to calculate the measured NSA (A N ):
where
AF T is the antenna factor of transmitting transmit antenna (dB/m)
AF R is the antenna factor of receiving receive antenna (dB/m)
∆AF TOT is the mutual impedance correction factor (dB)
GSCF is the geometry-specific correction factor (dB).IEEE C63.4A pdf download.