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Product Description
The HP 84125A/B microwave EMI measurement test system is
designed to measure the radiated energy from an unintentional
or intentional radiator such as a transmitter or transceiver. It
provides a system level solution to make measurements above
1 GHz. The HP 84125A/B system is designed to test products for EMI
compliance to current FCC regulations governing emissions and has
the performance necessary for measuring to current ETSI and CISPR
regulations in the same frequency band.
The system is integrated into a portable instrument cart for easy
transport to and from the test location. There are two major
components of the system: a hand-held, tripod-mountable or antenna
mast-mountable test set and the EMC analyzer mounted on an
instrument cart. The test set contains two low noise ampliers,
high-pass lters, antenna, and interconnecting cables. A three-meter
RF cable assembly connects the test set to the EMC analyzer
and allows the test set to be moved around without moving the
instrument cart. The RF cable assembly contains a rugged, low loss,
high frequency cable and two DC power cables for the ampliers.
The calibration data is stored on a RAM card during factory
calibration of the HP 84125A/B microwave EMI measurement test
system and is shipped with each HP 84125A/B system. The calibration
data is specic to that system. The RAM card contains amplitude
correction factors for the test set and the antenna.
To combine the functionality of the HP 8593EM EMC analyzer and
the test set, a downloadable program (DLP) has been provided. The
DLP provides the system softkeys that set the parameters for making
an EMI measurement. Frequency ranges can be selected enabling
you to test the harmonic frequencies of your equipment under test
(EUT) while ltering out the fundamental frequencies. Correction
data is used to sum out losses due to the antenna, cables, ampliers,
and lters. The values displayed by the HP 84125A/B system are
the actual eld strength of the emission (in dB V/m), corrected
for all system gains and losses including the antenna transducer
factors. A limit line is provided to assist you in identifying problem
emissions. The EMC analyzer is automatically setup for optimum
signal identication.
Each system is calibrated by Hewlett-Packard before shipment. The
calibration data consists of amplier gain, cable loss, lter response,
and antenna factors. The data is then stored into data correction
tables which are loaded into the HP 8593EM EMC analyzer's RAM
card for easy recall during each measurement band.
Product Description 1-1
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