All DSI EMC receivers have powerful EMC software integrated into them.  The software provides a suite of standard tests which are used to configure the device automatically.  This includes the ability to set up the following parameters for multiple segments of a sweep:

• Measurement bandwidth
• Step sizes
• Detectors
• Attenuator settings
• Pre-amplification
• Sample time
• Sample count
• Pre-selector status
• Transducer correction factor
• Cable correction factor
• Turntable position
• Antenna mast position.

An example of the spectrum analyser mode is shown above.  Click here for a larger image. Correction figures from the input device and cables are used in the calculation of the spectrum.

Click here for an example of the setup screen used to configure the sweep and limit lines for various common tests.  FCC, CISPR, MIL-STD and user defined tests are all available.

An example set of sweep parameters and a limit line is shown here.  The sweep from 150kHz to 1GHz is broken into 3 segments.  Each segment is fully configurable; including measurement bandwidth, step size and detector type.

Input devices are defined using a dedicated editor shown here.  Various correction factors can be added or removed.  The transducer type and bandwidth are defined so that they can be checked against the sweep parameters.  A signal generator can be used as a calibration source or act as a tracking generator.

An example sweep is shown here, showing the limit line, sweep results and the correction factor.  We have shown a step change in the correction factor to demonstrate the effect.  In normal use, this would be correcting the response of the transducer resulting in a flat sweep.

All results are configured in to a report with full details of the sweep.  Any signals that approach or breach the limit line are listed.

Once a set of measurements has been saved from the sweep, limit line crossings, harmonics of a users supplied frequency of interest or the largest N signals in the sweep.  In this example we have selected 10 harmonics of 50MHz for further scrutiny.

In the measure screen you can choose the detectors to be used at each frequency of interest.  The measurement bandwidth can be defined here also.  The receiver steps through each frequency taking the measurements required.  This builds up a datalog of measurements at particular points, using specific detectors.

The plots and datalog can be output in a report format including the narrowband and broadband determination.

Frequently Asked Questions about Dynamic Sciences products