Read JBL ON TOUR XTB (serv.man5) EMC - CB Certificate online
Nemko USA, Inc.
11696 Sorrento Valley Road, Suite F, San Diego, CA 92121
Phone (858) 755-5525 - Fax (858) 452-1810
DATE
DOCUMENT NAME
DOCUMENT #
PAGE
Error! Reference
source not
found.
Harman Multimedia - On Tour XTB - RTTE Test Report
2009 11138368 EMC
14 of 73
Template 7-09aal
4.3. Statistical Sampling Required for Continued Compliance
For quality assurance of ongoing productions to comply with RFI interference limits, CISPR 22 Clause 7
stipulates a statistical sampling procedure. In summary, this rule states that the manufacturer should ensure 80%
of the units must be in compliance with an 80% confidence level. Refer to CISPR 22, Clause 7 for a detailed
description of the sampling procedure.
4.4. Configuration and Methods of Measurements for Conducted Emissions
EN 55022 specifies the general configuration of the EUT and associated equipment, as well as the test platform
for conducted emissions testing. Tabletop
devices are placed on a non-conducting surface 80 centimeters above
the ground plane and 40 centimeters from a vertical ground plane wall. The EUT was powered via an Artificial
Mains Network (AMN). Both quasi-peak and average detector measurement modes are used. If however, the
average limit is met while using a quasi-peak detector, the test unit is deemed to meet both the limits, and
measurement with the average detector receiver is unnecessary. The quasi-peak and average emission levels are
then recorded and compared to the applicable EN 55022 limits to determine compliance.
Mains Network (AMN). Both quasi-peak and average detector measurement modes are used. If however, the
average limit is met while using a quasi-peak detector, the test unit is deemed to meet both the limits, and
measurement with the average detector receiver is unnecessary. The quasi-peak and average emission levels are
then recorded and compared to the applicable EN 55022 limits to determine compliance.
4.5. Configuration and Methods of Measurements for Frequency Identification
When performing all testing of equipment, the actual emissions of the EUT are segregated from ambient signals
present within the laboratory or the open-field test range. Preliminary testing is performed to ensure that
ambient signals are sufficiently low to allow for proper observation of the emissions from the EUT. Ambient
signals within the laboratory are compared to those noted at the nearby open-field site to discriminate between
signals produced from the EUT and ambient signals. In the event that a significant emission is produced by the
EUT at a frequency that is also demonstrating significant ambient signals, the spectrum analyzer is placed in the
peak mode, the bandwidth is narrowed and the EUT's signal is centered on the analyzer. The scan width is
expanded to 50 kHz while monitoring the audio to ensure that only the EUT signal is present, the analyzer is
switched to quasi-peak mode, and the level of the EUT signal is recorded.
Click on the first or last page to see other ON TOUR XTB (serv.man5) service manuals if exist.