R&S®TS9975 EMI Test System Family
EMI measurements in line with wireless, commercial, military and automotive standards
Wireless tests
Standards
The system can cover all requirements of the following wireless standards
- AMPS
- CDMA, TDMA
- GSM450/850/900/1800/1900
- GPRS, EDGE
- UMTS
- Bluetooth®2.0 + EDR
- WLAN 802.11a, b, g
- WiMAX 802.16
Configurations for other standards are available on request. Customer-specific adaptations to other standards or different regulations can be integrated into
System Configuration
The system features a highly modular hardware and software concept. Customized systems can be configured from a variety of instruments. The system is a complete package of hardware and userfriendly software as well as system services so that the user will be familiar with the system within the shortest possible time.
The main difference between spurious emission measurements and EMI measurements is that bandwidths matching the useful signal instead of the typical EMC bandwidths (e.g. 200 Hz, 9 kHz, 120 kHz) have to be set on the receiver.
It should also be noted that EMC bandwidths are refered to the 6 dB points of the IF filters, whereas the bandwidths for spurious emission measurements are refered to the 3 dB points. In spurious emission measurements, the peak detector takes the place of the quasi-peak detector.
All these differences call for a test receiver with spectrum analyzer functionality rather than a pure test receiver. In addition to EMI and spurious emission, the
- Anechoic chamber
- Hardware
- Test receiver
- Test antennas
- Filter unit
- Communications tester
- Software
Radiated emissions and susceptibility are measured in an anechoic chamber. This requires a remote-controlled turntable and an automatic antenna mast with a control unit. These optional components can be supplied with the system and controlled by the system software. For development and quality assurance purposes, smaller test cells that easily fit into the lab are available, especially for spurious emission measurements.
A process controller (PC) controls the complete measurement system via its IEC/IEEE bus interface. Depending on the frequency range to be covered and the special test requirements, measurements are carried out by one or several test receivers.
The test receiver forms the core of the system. It evaluates and displays emissions in line with the relevant standards. In addition, it offers spectrum analyzer functionality for spurious emission measurements. If only spurious emissions are to be measured and if precompliance measurements are sufficient for EMC testing, a spectrum analyzer can be used instead of the test receiver.
The upper frequency limit of the test system can be 3/7/18/26 GHz or 40 GHz. This depends on the type of DUT and the applied standard.
Suitable test antennas (usually log-periodic or horn antennas) and artificial mains networks are used for picking up emissions.
To measure spurious emissions (for example of mobile phones) in line with standards at a sufficiently wide dynamic range while the DUT is transmitting, the useful signals emitted by the DUT must be suppressed at the receiver input by means of bandstop or highpass filters.
To do this, Rohde & Schwarz has developed a special filter unit whose flexible design allows customers to choose from the common radio standards. These filters are specially designed to enable measurements in line with the standards. Because modern DUTs use more than one wireless service simultaneously, two filters (e.g. GSM and Bluetooth®; GSM and WLAN) can be active at the same time. Customer-specific requirements can also be met.
A communication tester is integrated in the test system to switch and control the link to the DUT in a defined operating state.
The
