品 牌：德国罗德与施瓦茨 | R&S | Rohde&Schwarz

 

Rohde & Schwarz ESVD EMI Test Receiver, 20 MHz - 1 GHz （2 GHz）

 

The R&S ESVD Test Receiver is equally suitable for the measurement of signal strength ａnd interference.

 

For planning ａnd operation of mobile radio networks it is important to know the propagation conditions in the area to be covered. The ESVD Test Receiver features optimal bandwidths for mobile radio services as well as a high measurement rate so that it is ideal for fixed ａnd mobile coverage measurements.

 

The number of measurements required to ensure electromagnetic compatibility is continuously increasing in the field of RFI measurements. Thanks to the built-in intelligence of Test Receiver ESVD, the time required for such measurements is reduced considerably. Being also a specialist for EMI measurements to CISPR, CENELEC, ETSI, FCC, VCCI ａnd VDE standards, the ESVD can furnish results more rapidly ａnd accurately than has been possible up to now.

 

The R&S ESVD Test Receiver for digital mobile radio networks is a triple-conversion heterodyne receiver covering the frequency range from 20 to 1000 MHz （2050 MHz optionally）. Its main features ａnd facilities are:

 

* RF attenuator switchable in 10-dB steps in the range 0 to 120 dB

* One preselector with fixed tuning ａnd five tracking preselectors, option ESVD-B2 with four additional filters with fixed tuning

* Preamplifier with wide dynamic range, can be switched between preselector ａnd 1st mixer

* Crystal-stabilized synthesizer as 1st LO, variable in 100-Hz steps, sweep mode for fast frequency scans; frequency accuracy complying with GSM recommendations

* High-level mixer ensuring high isolation of 1st LO for converting the input frequency to the first IF （1354.7 MHz or 394.7 MHz）

* High-level mixers for conversion to the second （74.7 MHz） ａnd third （10.7 MHz） IF

* IF filters （10 kHz, 120 kHz, 300 kHz ａnd 1 MHz） in the third IF stage with group-delay optimization

* Precise I/Q demodulator

* Highly linear envelope detector with more than 70 dB dynamic range

* Peak, average ａnd quasi-peak detectors operating in parallel, which enables simultaneous measurements in different weighting modes

* Peak indication with IF bandwidth correction factors for measuring broadband interference （PK/MHz） automatically taken into account

* Measurement monitoring by means of automatic overload detection in the relevant ESVD stages ａnd by the permanently activated peak detector

* Logarithmic amplifier with more than 70 dB dynamic range

* 12-bit A/D converter with short conversion time

* Measurement time selectable between 1 ms ａnd 100 s

* Flash EPROMs allowing convenient ａnd fast firmware updating with the aid of a PC

* Digital level indication on LC display ａnd analog level indication on moving-coil meter taking into account transducer factors ａnd their units

* Automatic calibration at a key-stroke with the aid of a high-precision built-in generator

* Demodulator circuits for FM, AM ａnd A0; built-in loudspeaker ａnd headphones connector

* Automatic monitoring of all synthesizer loops ａnd supply voltages during operation

* Detection of faulty modules by built-in selftest facilities

 

Design

The service-friendly modular design of ESVD ensures excellent results regarding RFI emission ａnd immunity. A quiet, temperature-controlled blower minimizes self-heating of ESVD. Comprehensive built-in test functions allow any module requiring servicing to be easily identified ａnd replaced independently of other modules.

 

Functions

ESVD combines three classes of instruments in one:

 

* the system-compatible test receiver for GSM field-strength ａnd EMI measurements

* the compact, manually tunable ａnd battery-operated test receiver

* the automatic test receiver which performs EMI measurements ａnd reports the results is equally suitable for the measurement of signal strength ａnd interference.

 

For planning ａnd operation of mobile radio networks it is essential to know the propagation conditions in the area to be covered. Test Receiver ESVD features optimal bandwidths for mobile radio services as well as a high measurement rate so that it is ideal for fixed ａnd mobile coverage measurements.

 

The number of measurements required to ensure electromagnetic compatibility is continuously increasing in the field of RFI measurements. Thanks to the built-in intelligence of Test Receiver ESVD, the time required for such measurements is reduced considerably. Being also a specialist for EMI measurements to CISPR, CENELEC, ETSI, FCC, VCCI ａnd VDE standards, the &S ESVD can furnish results very rapidly ａnd accurately.

 

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ADVANTEST（爱德万）、Anrilsu（安立）、R／S（罗德&施瓦茨）、Panasonic（松下）、

LEADER（利达）、KlKUSUI（菊水）、MlNOLTA（美能达）等世界著名品牌。

 

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