ANSI C63.15 pdf free download
ANSI C63.15 pdf free download.Recommended Practice for the Immunity Measurement of Electrical and Electronic Equipment.
Commercial testing couples voltages using coupling-decoupling networks (CDNs) on power and I/O wiring in common-mode. The use of the CDNs sets the ioop impedance so that the test voltage levels are maintained (no over-testing when using CDNs). The decoupling section helps preclude malfunctions, due to the interfering voltages, of the AE used to monitor EUT acceptance. Interfering voltages are coupled onto all wires of an interface simultaneously, in common-mode, to simulate actual use. inductive coupling or an electromagnetic (EM) clamp can also be used for commercial testing as an alternative to CDNs; this can be a preferable method if a CDN is not available, e.g., for a custom I/O cable.
Each coupling method requires a ‘level-setting” procedure to determine the required drive level for that coupling method, test level, and test setup. This “drive table” is then played back by the computer (with 80% amplitude modulation (AM) applied; 1 kHz or 400 Hz) during the test run, with an appropriate dwell time (usually 2 s) at each frequency, and the performance of the EUT is monitored by decoupled AE for failures.
5.3.2 Test procedure
5.3.2.1 General
For military testing, use the test procedure given in Method CS 114 of MIL-STD-461G-2015 from 10 kHz to 200 MHz. The procedure requires both inducing a current and measuring such current, to preclude over- testing into zero (infinitesimally small) impedance loads from occurring. Note also that during playback, the limit on induced current is not the calibration curve, but instead is defined in 5.12.2 of MIL-STD-46iG- 2015. These limits can be tailored to the EUT based on actual usage environment.
For commercial testing, IEC 6 1000-4-6 can be used over the frequency range 150 kHz to 80 MHz (typically) or as high as 230 MHz. CDNs are now available for almost every type of I/O line, including Ethernet. The use of CDNs is required if they are appropriate for the line being tested. A level-setting procedure is required for each CDN. All power and I/O wiring should have input-terminated CDNs before level-setting or testing begins on any of them. In the case of some complex lines, such as with medical products, the product may not function due to CDN impedance or use of a CDN may not be appropriate, then use of the EM clamp is appropriate.
The IEC 61000-4-6 commercial standard uses a logical decision tree to guide in the choice of coupling method. First, it asks whether CDNs are suitable. If a terminated CDN is inserted into the power or I/O lines of the EUT, and those lines continue to function, then that CDN should be used on those lines. A CDN should be used whenever possible, and the odds of passing the test are enhanced by the decoupling section of the CDN. Extra mains (M3) CDNs or other CDNs for the AE can be needed with all coupling methods.
Signal Source No. 1 should be modulated in the same manner as specified in the section pertaining to receiver sensitivity measurements of the detailed equipment specification. When the equipment specification does not define this, the following should be used:
AM receivers: The signal generator should be 80% modulated by a I kHz sine wave. SSR and FM receivers: The signal generator should be unmodulated.
Pulse receivers: The modulation pulse should be adjusted so that 80°/o of its spectral energy lies within the 3 dB bandwidth of the receiver.ANSI C63.15 pdf download.
