How to use the ETSi4334 to Find Problem Frequencies

How to use the ETSi4334 to IDENTIFY PROBLEM FREQUENCIES

This step by step guide explains how to use the ETSi4334 to identify the frequencies at which maximum emissions are being generated.

If you already know the frequency at which you system needs investigation then see step by step guide 1 'FIND THE SOURCE OF AN EMISSION'

STEP 1
Place the PCB on to the glass platen of the ETSi4334 with the component side uppermost. Push the PCB into the top left-hand corner up against the origin guides. Make sure the ETSi4334 is plugged in and switched on.

STEP 2
Connect the PCB to a suitable power supply. The ETSi4334 provides +5v, -5v, +12v and -12vfor this purpose if suitable. The PCB should be connected to any other equipment and cables required for it to operate normally; Tests should only be carried out with the PCB operating normally. All power and signal cables should be passed through cable clamp probes so that emissions radiated form the cables can be analysed.

STEP 3
Run the ETSi software and select the 'Scan' page. A scan is a graph of the emissions over a range of frequencies. Enter the start and stop frequencies and select the signal source. The signal source can be one of the following: The XY-Plot probe, one of the 5 cable clamps connectors, or the board loop probe. Try the cable probe first especially if emissions are likely to be below 250MHz or the board loop for an overall impression of the emissions.

You can run the Plot Wizard to guide you through entering this information by clicking the 'Wizard' button.

STEP 4
Run the scan by clicking the 'Start' button. Depending on the frequency range the scan will typically take between 2 and 5 minutes. You can stop or pause the scan at any time by pressing the 'Stop' or 'Pause' buttons.

STEP 5
When the scan has finished the emissions are displayed as graph of frequency verses emission level. The peak values will be displayed in a list to the side of the graph. These peak frequencies are automatically transferred to the XY-Plot page.

Testing Tips

* To make this scan a reference, click the 'Make Scan the Reference' button. A reference scan can be used to show the difference between two scans - to highlight the changes made by a modification for instance. You must save the scan as a reference to use it as part of an automatic test.

* To save the scan to disk, click the 'Save' button.

* To print the scan, click the 'Print' button.

* If you want details of the PCB to be saved in the file or appear on printouts then you must enter the information on the EUT page.