NARDA PMM L3-32, Руководство пользователя

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7-2 Operating PMM Networks
7.2 Test Set-Up
Considerations
Measurement repeatability is the main concern of standards and
regulations, that exactly define the test set-up for interference
measurements. The Artificial Mains Network complies with CISPR publ.16
(part 2), VDE 0876 and the American FCC part 15 rules and regulations.
The test SET-UPs required for various standards are largely identical; a
detailed description is given in VDE 0877 part 1. (par. 9.2 "Measurements
using LISNs").
The DUT has to be positioned on a non-metallic or conductive table (height
>80cm.), 40 cm. in front of a metallic grounded wall with dimensions of at
least 2 m. x 2 m.
The table may also be used inside a screened room.
The distance of the DUT from any metallic part may affect the measured
RFI voltage values; VDE 0877 exactly define the dimensions for the test
configurations, by means of the following drawing:
Fig. 7-1 Typical test set-up
The figure 7-1 describes the test configuration and the interconnection of a
mains operated DUT, according to the above mentioned VDE specification,
where:
1. Metallic grounded wall;
2. Device Under Test (DUT);
3. Folded mains cable fixed with strips of adhesive tape;
4. Non-metallic table;
5. RFI measuring receiver;
6. Line Impedance Stabilization Network (LISN) with:
B - connection to reference ground.
P - jack for DUT.
M - coaxial connection to measuring receiver.
All dimensions are given in centimeters.
Internal hardware checks and repairs shall be performed only by
NARDA authorized assistance and service centers.
The manufacturer, the worldwide distributors and the national
distributors shall not be responsible and kept liable for damages to
goods, to instruments or persons caused during unauthorized
operations on the instrument, or by manumitted instrument.