|How to use the ETSi4334 to
COMPARE A PCB AGAINST A REFERENCE
This step by step guide explains how to use the ETSi4334 to compare a PCB
against a previously analysed reference. This would typically be done as a
Quality Control procedure to ensure that production units are not producing
more noise than a known compliant system.
An automatic test is a series of XY-Plots and frequency scans which are
executed sequentially. At the end of each plot or scan the levels of emission
are compared with those of the reference stored in the plot/scan file. If the
levels from the sample exceed those of the reference by more than a pre-set
tolerance then the sample fails the test.
A typical automatic test would consist of a frequency scan using the board
loop, a frequency scan of all the cables attached to the PCB, and one or more
XY-Plots at the frequencies which show peak emissions.
In order run an automatic test the test must have previously been build up from
existing XY-Plots and Scans. For help with creating an Automatic test run the
'Auto Wizard' from the Auto page of the ETSi software. For help with producing
XY-Plots and Frequency Scans see Step by Step guides 1 and 2
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.
Connect the PCB to a suitable power supply. The ETSi4334 provides +5v, -5v,
+12v and -12v for 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.
Run the ETSi software and select the 'Auto' page. Click the 'Open' button to
open an existing Auto test.
Run the test by clicking the 'Start' button. You can stop or pause the test at
any time by pressing the 'Stop' or 'Pause' buttons.
When all the plots and scans have finished the results are displayed in a table
on the Auto page of the ETSi software. The table clearly shows whether
individual plots and scans passed of failed.
* To save the test to disk, click the 'Save'
* To print the plot, click the 'Print'
* 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