User`s manual

REPORT NO. :E940705(A)
Page 9 of 24
NVLAP LAB CODE: 200097-0-
PEP Testing Laboratory
12-3Fl, No. 27-1, Lane 169, Kang-Ning St., Hsi-Chih,
Taipei Hsien, Taiwan, R. O. C.
TEL: [phone] FAX: [phone]
7. Description of Conducted Emissions Test
7.1 Conducted Emissions
A 1m x1.5m wooden table 80 cm high is placed 40cm away from the vertical wall. Two AMN
are bonded to the grounding plane. The EUT is powered from the designated AMN and the
support equipment is powered from another designated AMN. Powers to the AMN are filtered
by a high-current high insertion loss power line filters. All electrical cables are shielded by
braided tinned copper zipper tubing with inner diameter of 1/2”. All interconnecting cables
more than 1 meter were shortened by non-inductive bundling (serpentine fashion) to a 1-meter
length.
Sufficient time for the EUT, support equipment, and test equipment was allowed in order for
them to warm up to their normal operating condition. The RF output of the AMN was
connected to the spectrum analyzer to determine the frequency producing the maximum EME
from the EUT.
The spectrum was scanned from 150kHz to 30 MHz with1.5 sec sweep time. The frequency
producing the maximum level was re-examined using Quasi-Peak adapter. The detector
function was set to CISPR quasi-peak mode. The bandwidth of the receiver was set to 10kHz.
The EUT, support equipment, and interconnecting cables were re-arranged and manipulated to
maximize each EME emission. Each emission was maximized by: switching power lines;
varying the mode of operation or resolution; clock or data exchange speed; scrolling H pattern
to the EUT and/or support equipment, and powering the monitor from the floor mounted outlet
box and the computer aux AC outlet, if applicable; whichever determined the worst-case
emission.
7.2 Conducted Emissions Limits
Frequency Maximum RF Line Voltage dB(uV)
Class A Class B
MHz QUASI-PEAK AVERAGE QUASI-PEAK AVERAGE
0.15 - 0.50 79 66 66-56 56-46
0.50 - 5.0 73 60 56 46
5.0 - 30 73 60 60 50
Remarks : In the above table, the tighter limit applies at the band edges.