Atec ESPI Datasheet
Test Receiver R&S®ESPI
Data sheet
Version
05.03
May
2009
Excellent test receiver features
◆ Choice of 7 detectors
◆ EMI measurement bandwidths
200 Hz, 9 kHz, 120 kHz, 1 MHz
◆ Pulse weighting with quasi-peak,
average and RMS average detector
in accordance with the latest
CISPR 16-1-1 edition
◆ For all commercial EMI standards
The precompliance standard up to 7 GHz
Extremely high measurement speed
◆ Measurement times
from 100 µs to 100 s
◆ Option: preselector and
20 dB preamplifier
Spectrum analyzer
◆ IF resolution bandwidths
from 10 Hz to 10 MHz
◆ Test routines for TOI, ACP, OBW,
CCDF
Outstanding performance features
◆ Total measurement uncertainty
– Spectrum analyzer mode: 0.5 dB
(without preselection)
– Receiver mode: <1.5 dB
◆ Displayed average noise level (DANL):
–155 dBm (1 Hz), f < 1 GHz
◆ NF = 21.5 dB (12 dB with preamplifier)
◆ Programmable scan tables
◆ Limit lines
◆ Transducer tables and sets
◆ Brilliant 21 cm TFT color display
Precompliance Test Receiver/Spectrum Analyzer
R&S®ESPI...
◆ Optimized operating concept owing to
decades of experience in EMI test
receiver development
◆ Very high measurement speed
◆ High measurement accuracy
With the two ¸ESPI test receiver
models, the well-known advantages of
the ¸ESIB high-end compliance test
receivers/analyzers have been systematically implemented for the upper middleend.
Due to a common platform system, the
user has the additional benefits of the
¸FSP spectrum analyzer family which
is already in place. These benefits by far
exceed the capabilities and functions of
conventional precompliance test equipment.
The ¸ESPI defines the vital criteria,
such as functionality, measurement speed
and accuracy for middle-end equipment.
The use of innovative techniques, such as
the VLSI frontend and largely digital
signal processing, together with ASICs
developed by Rohde & Schwarz, has
resulted in a product with top-class
specifications and high reliability.
Outstanding features
TEST RECEIVER
◆ Peak, Quasi-Peak, Average, CISPR
Average, RMS and RMS Average
(max. 3 detectors simultaneously)
◆ EMI measurement bandwidths
200 Hz, 9 kHz, 120 kHz, 1 MHz
◆ Correct pulse weighting in line with
CISPR 16-1-1 from 10 Hz pulse repeti-
tion frequency
◆ For all commercial EMI standards
such as CISPR, EN, ETS, FCC, ANSI
C63.4, VCCI and VDE
◆ Option ¸ESPI-B2:
Preselector and 20 dB preamplifier
SPECTRUM ANALYZER
◆ Resolution bandwidths from 10 Hz
to 10 MHz (in 1/3/10 sequence)
◆ RMS detector for measurements on
digitally modulated signals
◆ Test routines for TOI, ACPR, OBW,
amplitude statistics
Unprecedented
measurement speed
◆ Fast detection of critical frequencies
through overview measurements:
– Measurement time 100 µs to 100 s
in receiver mode
– up to 16 000 s in analyzer mode
2 Test Receiver ¸ESPI
...the standard in the EMI precompliance class
EMC-relevant
performance features
◆ Total measurement uncertainty
– Spectrum analyzer mode: 0.5 dB
(without preselection)
– Receiver mode: <1.5 dB
◆ Displayed average noise level (DANL):
–155 dBm (1 Hz), f < 1 GHz
◆ Noise figure 21.5 dB
(12 dB with preamplifier option)
◆ Overview measurements in spectrum
analyzer mode
◆ User-programmable scan tables
◆ Display of results and comparison
with standard-conforming limit lines
◆ Correction values for cable loss,
coupling networks and antennas
included as transducer factor
◆ Data reduction and modification of a
frequency list for weighted final measurement
◆ Bargraph display for different types of
detectors
◆ Overload indication
◆ Built-in AF demodulator
◆ EMI bandwidths in line with CISPR
◆ Brilliant 21 cm TFT color display
Precompliance has a name: R&S®ESPI3 and R&S®ESPI7
Features
The ¸ESPI 3 and ¸ESPI 7,
which are suitable for all commercial EMI
standards in line with CISPR, EN, ETS,
FCC, ANSI C63.4, VCCI and VDE, have
been specially designed for precompliance measurements in development. The
aim is to perform EMC diagnostic measurements on the devices under test as
quickly as possible and as accurately as
necessary and to document the results.
9 kHz 3 GHz
The final compliance test will then be
purely a formality. The advantages of test
receiver accuracy and selectivity combined with the measurement speed of a
spectrum analyzer define the crucial performance features for a new class of test
receivers.
¸ESPI 3: 9 kHz to 3 GHz
¸ESPI 7: 9 kHz to 7 GHz
These two models make it possible to
take products through the critical stages
of development and the EMC test plan
and still be on schedule for approval and
market launch.
¸ESPI 3
¸ESPI 7
7 GHz
The precompliance measuring instruments from Rohde & Schwarz provide the
functions that are required for in-house
test sequences:
◆ Manual measurement of EMI spectra
owing to the receiver-oriented
operating concept
◆ Semi-automatic measurements with
predefined scan and sweep tables
allowing interactive interruption
◆ Individual evaluation of critical fre-
quencies using markers and additional detectors assigned to the markers
which are simultaneously displayed
◆ Fully automatic interference measure-
ments in conjunction with external
EMI software packages from
Rohde & Schwarz, including, for instance, determination of the worst
case by automatic switchover of the
phase and protective ground settings
via the USER port for remote-controlled line impedance stabilization
networks
Test Receiver ¸ESPI 3
Accuracy and reproducibility are also key
parameters for all applications of the
¸ESPI test receiver family.
The combination of test receiver and
spectrum analyzer provides an optimum
concept for precompliance measurements in development environments.
Standard-conforming EMI
measurements
Fitted with the optional preselector/preamplifier (¸ESPI-B2), all ¸ESPI
models feature an excellent dynamic
range compared with other precompliance solutions and are, therefore, able to
perform precise interference measurements with pulse repetition frequencies
(PRF) from 10 Hz in line with
CISPR 16-1-1.
¸ESPI-B2: preamplifier and preselection filters up to 3 GHz
The input stages of precompliance test equipment, which often feature
a rather poor overload capability, would be hopelessly overdriven
without a preselection unit. This is different with the ¸ESPI where,
in combination with preselection filter units, a low-noise preamplifier
comes after the filter module but before the mixer stage. It must be
possible to switch the preamplifier on/off as required, since in the case
of high signal levels, the dynamic range would be reduced by an amount
numerically equal to the gain. Where low signal levels are to be
expected, it is best to switch in the preamplifier. Since the Test
Receivers ¸ESPI operate both in the spectrum analyzer mode and in
the test receiver mode, both modes offer the choice of switching the
preamplifier on or off. In the receiver mode, the preselection filter
setting is fixed, whereas in the analyzer mode it can be selected.
Measurements to commercial EMI standards such as CISPR, EN 550xx, ETS, FCC,
ANSI C63.4, VCCI or VDE can be carried
out directly by comparing the EMI spectrum with the associated limit lines and
switching on the appropriate detectors
(PK, QP, CAV, AV, RMS-AV, RMS).
The detectors
Depending on the operating mode of the
¸ESPI 3 and ¸ESPI 7, i.e. spectrum analyzer or test receiver, the following detectors are available:
◆ Analyzer mode: MaxPeak, MinPeak,
AutoPeak, Sample, Quasi-Peak,
Average, CISPR Average, RMS,
RMS Average
◆ Receiver mode: MaxPeak, MinPeak,
Quasi-Peak, Average, CISPR Average,
RMS, RMS Average
Spectrum analyzer mode with selectable preselection filters and preamplifier switched on
Up to 3 detectors can be activated simultaneously and the results displayed.
The bargraph display, with current detector value and MaxHold display, clearly
shows the results of manual circuit
adjustment when the DUT cabling is
arranged for maximum emissions and
when the antenna is aligned relative to
the DUT for a maximum reading.
In the receiver mode, the QP detector is
coupled with the time constants, prescribed by the standard, as a function of
the frequency range. This ensures that
the correct time constants and IF bandwidth are used for signal weighting in the
CISPR bands. This means much greater
ease of operation for the user.
4 Test Receiver ¸ESPI
The measurement bandwidths
The measurement bandwidths of the
¸ESPI are designed for a large variety
of applications:
The analyzer mode provides all –3 dB
bandwidths from 10 Hz to 10 MHz
(in 1/3/10 sequence). In the receiver
mode, the –6 dB bandwidths can also be
selected by softkey: 200 Hz, 9 kHz,
120 kHz plus 1 MHz bandwidth.
Moreover, approx. 40 digital channel
filters are available.
Like the detectors, the standard-conforming CISPR bandwidths can be coupled as
a function of the frequency range. If
necessary, the coupling can be disabled.
The preselector/preamplifier option
(¸ESPI-B2) is available as a protection against overloading by pulsed, highpower signals and for ensuring the validity of signal evaluation in the linear operating range of the measuring instrument.
The advantage of this option is that, in
the analyzer mode, the preselection filters or the preamplifier can be switched
on or off as required.
SCAN table
User-selectable parameters in
up to 10 subranges
The basis for all reproducible measurements is a scan table with up to ten subranges and user-programmable frequency parameters such as START, STOP,
STEP SIZE, resolution bandwidth, measurement time per frequency as well as
RF attenuation setting at a constant value
or coupled to AUTO RANGE overload
monitoring. For sensitive measurements
(if low signal levels are expected), the
preamplifier can be switched on or off as
a function of the subrange.
Test Receiver ¸ESPI 5
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