Specifications

15
• The ideal EMI diagnostic tool
• Measurement software for fully automated EMI testing
• The Agilent 85685A RF preselector converts the
Agilent 8568B/85650A into a CISPR receiver
• Accessories available for making complete EMI test systems
VDE, CISPR) EMI testing. Many com-
mon EMI tests are provided in the
85864A software library on discs, and
a custom test can be implemented
within minutes for individual testing
needs. The software has a variety of
analysis features for diagnosing or
identifying the measured emissions.
You can “zoom to local” and identify
the type or source of emission, print
the peak responses of the measured
emissions above a desired threshold
level, perform a quasi-peak
measurement over a selected
portion of the measurement range,
and mark Specific responses for
identification on a report. The
858U4A also provides hardcopy
output (plotted or printed) and disc
storage capability for saving data or
new test setups.
The 85685A RF preselector converts
the 8566B and 85650A quasi-peak
adapter into an EMI receiver
conforming to CISPR (Comité
International Special Des Perturbations
Radioélectriques) publication number
16 recommendation. The preselector
provides overload protection and
improves measurement sensitivity.
EMI regulations can be divided into
two general categories: military
regulations and commercial
regulations. Commercial regulations
have been heavily influenced by the
recommendations of CISPR, a special
committee of the International
Electrotechnical Commission (IEC).
Many international groups have
adopted in part the recommendations
of CISPR, including the Federal
Communications Commission (FCC)
in the USA and the Verband Deutscher
Electrotechniker (VDE) in Germany.
There are numerous military EMI
standards, but the most widely used
of these is Military Standard 461/462
(developed by the Armed Forces of
the USA).
The procedures for making military
standard (MIL-STD) measurements are
different from the procedures required
for making CISPR measurements.
The 8568B spectrum analyzer has
the capability to meet MIL-STD
measurements and, when used
with the 85650A quasi-peak adapter,
has the capability to meet the
requirements of both CISPR and
MIL-STD measurements. The graph
shown below is a test result of an
FCC measurement and illustrates
how an 8568B-based automatic
measurement system can use the
spectrum analyzer’s custom graphics
and hard copy capabilities.
The spectrum analyzer has long burn
a useful tool in evaluating electro-
magnetic interference (EMI) spectra
for troubleshooting and preliminary
qualification testing. The 8568B
spectrum analyzer, with high
performance and full programmability,
allows difficult and time-consuming
EMI compliance tests to be completed
automatically.
The spectrum analyzer’s ability to
display wide frequency spans provides
“quick-look” capability, making it
effective for locating FMI “hot spots”
manually. Full programmability and
the graphics display capability for
log pints, limit lines and hard copies
make the 8568B a very powerful and
effective measurement tool for EMI
applications requiring automation.
The 85864A FMI Measurement
Software program, added to the
capability of the 8568B, is a powerful
combination for military standard
(MIL-STD) and commercial (FCC,
EMI Measurement Capability