> A couple of months ago, there was a discussion in this forum about how to
> test for EU conducted emssions and immunity on a 24 Vac CCTV camera. The
> consensus was that the the manufacturer was required to perform the tests
> before he could issue a Declaration of Conformity. This problem has come
> back to haunt me. I have been asked to cite the sections of the standards
> that support this position. My citations are listed below. Your comments
> would be appreciated.
>
> CONDUCTED EMISSIONS TESTING
>
> Based upon the following citations, it is clear that the FCC rules for
> digital devices requires that an EUT operating from the AC mains via an AC
> adapter or similar power source be tested for conducted emissions.
>
> Part 15.107(f) of the FCC rules states,
>
> Measurements to demonstrate compliance with the conducted limits are
> not required for devices which only employ battery power for operation and
> which do not operate from the AC power lines or contain provisions for
> operation while connected to the AC power lines. Devices that include, or
> make provision for, the use of battery chargers which permit operating
> while charging, AC adapters or battery eliminators or that connect to the
> AC power lines indirectly, obtaining their power through another device
> which is connected to the AC power mains, shall be tested to demonstrate
> compliance with the conducted limits.
>
> Part 15.31(a)(6) of the FCC rules states,
>
> NOTE: Digital devices tested to show compliance with the provisions
> of 15.107(e) and 15.109(g) must be tested following the ANSI C63.4
> procedure . . .
>
> ANSI C63.4-1992 Section 7 states,
>
> If the EUT normally receives power from another device that connects
> to the public untility ac powerlines, measurements shall be made on that
> device with the EUT in operation to ensure that the device continues to
> comply with the appropriate limits while providing the EUT with power. If
> the EUT is operated only from internal or dedicated batteries, with no
> provision for connection to the public utility ac powerlines (600 Vac or
> less) to operate the EUT (such as an adapter), ac powerline conducted
> measurements are not required.
>
> Based upon the following two citations, it is unclear if or how non-mains
> power ports are to be tested for CE compliance.
>
> EN55022 contains no guidance on the test setup of an EUT that is not mains
> operated except that Clause 2 makes a normative reference to CISPR 16-2:
> 1987 (methods of measurement).
>
> CISPR 16-2 contains no guidance on the test setup of an EUT that is not
> mains operated.
>
>
> CONDUCTED IMMUNITY TESTING
>
> Based upon the following two citations, it is clear that fast transient
> testing is required on AC power ports.
>
> EN 50082-1:1992 specifies in Table 4 that the "AC power ports" shall be
> subjected to the fast transients tests specified by IEC 801-4:1988.
>
> IEC 801-4:1998 specifies in clause 7.2.1 that "The EUT shall be arranged
> and connected according to its normal installation requirements." Clause
> 7.2.2 specifies that test equipment be coupled directly to the power
> supply lines of the EUT. There are no restrictions that the power ports
> must be directly connected to the AC mains.
>
> Richard Woods
> Sensormatic Electronics
> [email protected]
> Views expressed by the author do not necessarily represent those of
> Sensormatic.
>
>
>
