Spec Limits

Purpose
This training modules steps you through "Specification Limits" and how to deal with them, including:-
Important Points
Spec Limits : Updating Values

Creating Specification Limits

Specification Limit Selection

        
Specification Limits: Important Points
Steps
Enter steps in the specification limit, at the same frequency.  Vasona works out the correct amplitudes. See the example below at 230MHz.

Number of points
Dependent how you configure Vasona, the specification limits used may be limited to the number of points which the analyser can accept, ie for the HP8546A this is 24points.

Frequency Order + Zero
Points need to be entered in frequency order, a sort facility is available, or click on the Frequency Label.  In addition, files should not contain a 0 in the frequency column, the Log of 0 is not a valid number.

Type

Vasona currently supports only Average and Quasi Peak Limits.  Note: in debug mode you can do peak measurements.

Measurement Distance
The setting of measurement and specification distances is very important, if these values are different, Vasona will apply the difference using the following formula:-

Extrapolation

= 20*LOG [measurement distance / specification distance]
for example = 20*LOG [3/10] = -10.46dB.

Vasona will take this value into account when calculating results.  

Log Frequency Scale
Only limits which change with the Logarithm of Frequency can be input.  If you require the use of linear limits, calculate the intermediate amplitude values and then enter them if they were Logarithmic.  Note this only matters if the amplitude of the limit changes with respect to frequency.   

           

Update Specification Limit
No Function Form Description
1. Select Menu + View Limits Main Menu  
Select of the Details Options Click on the View Details button.

Select the Limit TAB. You will then see a selection of limits.

Various Specification Limits

 

2. Select  Limit Main Menu
DataSET
 
Select Edit Mode

From these limits, move your mouse over the one you want to edit, right-mouse button click, select "Edit File".

The DataSET manipulation window should now be displayed.

Note: you can see from these options that you can perform other functions:-

1. View the relevant file.
2. Edit, change and update the contents.
3. Open a completely new file.
4. Rename the existing file.
5. Delete the file altogether.
6. Look at various properties of the file.

3. Save file
DataSET
DataSET

 

Save DataSET From within DataSET do the following:-

1. From the menu bar select File.
2. Select option "Save".

 

        

Creating Specification Limits
No Function Form Description
1. Select Menu +
View Limits
Main Menu  
Select of the Details Options Click on the View Details button.

Select the Limit TAB. You will then see a selection of limits.

Various Antennas

 

2. Open  DataSET Menu Main Menu
DataSET
 
Select Edit Mode

Right mouse button click within the ICON display section. Then select "Open New File".

The DataSET manipulation window should now be displayed.

3. Select File Type DataSET  

Selection of DataSET Type

Update the file type with Specification Limit- Quasi Peak.

Quasi Peak Spec Limit Note that the Quasi Peak Limit Icon will appear ! 

 

4. Update DataSET DataSET  
Title of DataSET ! Enter the title of the limit, for example "RE - EN55022".

ie Radiated Emission for the specification EN55022.
Amplitude Units


Set 'Amplitude Units' to dBuV/m.

It is important to get this correct because these labels appear on graphical / tabular output. 


            



Set level to "A".
Set Distance to "10".

If the measurement distance is set different, Vasona will automatic extrapolate the results.

              
Level of DataSET
The following example shows a measurement distance of 10m, to change, click on the 10 and enter a different value, ie 3.

Example of measurement distance

 

4. Update Values in
DataSET
DataSET  
Selection of freq Click in the frequency box, where the value .000 appears.

Enter the relevant Value
Data Entry Type in 30, hit arrow key right  '>' , then enter the relevant amplitude/level.
Data Entry Press arrow key right '>' twice, then add a further frequency...     and so on....
Full Class A Limit Continue with this process till you have added all you points.

See Important points for further information.

5. Plot from within DataSET

Upon completion of the DataSET input it may be useful to plot the points to view if you have made any mistakes.  To do this perform the following:-

1. Select Tools from the menu bar.
2. Select Plot.
3. Select Log.

A plot will now appear, see the following example.

Plot of a class A, EN55022:1998

 

6. Save file
DataSET
DataSET

 

Save DataSET From within DataSET do the following:-

1. From the menu bar select File.
2. Select option "Save".

 

         

Selecting Your Specification Limits
No

Function

Form Description

Open Vasona, and do NOT run a template, you can select a new specification limit once a test has begun but we recommend this only for experienced users !.

1. Select Menu + View Limits Main Menu  
Select of the Details Options Click on the View Details button.

Select the Limit TAB. You will then see a selection of limits.

Various Specification Limits

 

2. Drag Limit Main Menu  
Drag + Drop selection of a Quasi Peak Limit Left mouse button click on the limit icon and drag it to the Upper Limit.


Note: you drag Quasi peak limits to the Upper space/area in the spectrum analyser display and the Average limits to the lower display.
Drag + Drop selection of a Quasi Peak Limit The next time you run this template this specification  limit will be used.

If there is a Limit symbol there, this will be updated once you have dropped your new limit in !.

 

3. Verification of which limit is loaded. Main Menu  
Icon Properties of a Specification Limit in a template. Move your mouse over the Limit icon within the "Spectrum Analyser Diagram" and your limit should be displayed in the Menu details.
View File Options from the Template Main Menu To view the contents of the specification limit, do the following:-

1. Move mouse over the limit symbol.
2. Right Mouse button Click.
3. Select "View File"
4. The DataSET window should appear

You can now look at the actual values.

 

This training modules steps you through Antennas and how to deal with them, including:-
Important Points
Updating Antenna Factors

Creating Antenna Factors

Antenna Factor Selection
            
Antenna Factors: Important points
Number of points
Dependent how you configure Vasona, the antenna factors used may be limited to the number of points which the analyser can accept, ie for the HP8546A this is 80points.

Frequency Order + Zero
Points need to be entered in frequency order, a sort facility is available, or click on the Frequency Label.  In addition, files should not contain a 0 in the frequency column, the Log of 0 is not a valid number.

Overall Correction Factor
Vasona uses the frequency points in this file as a reference.  For example it will ONLY add associated cable losses, pre-amplifier gains at the frequencies contained in this reference file.  You should look at your factors carefully to ensure that all variations have been covered.

Antenna Calibration
The antenna factors used during assessment must be those supplied by a calibration laboratory.  There are many ways to calibrate antennas, we recommend using free space factors. Please note antenna factors are dependent upon the following:-

1. Antenna height
2. Polarisation
3. Measurement distance
4. Particular in vertical polarization, which way up the antenna is !

                        .......   plus the obvious type, manufacturer and geometry. 

Further advice should be sort from calibration laboratories which have experience with antennas, for example NPL in the UK, and Liberty Labs in the US.
           
Update Antenna Factors
No Function Form Description
1. Select Menu + View Antennas Main Menu  
Select of the Details Options Click on the View Details button.

Select the Antenna TAB. You will then see a selection of antennas.

Various Antennas

 

2. Select  Antenna Main Menu
DataSET
 
Select Edit Mode

From these antennas, move your mouse over the one you want to edit, right-mouse button click, select "Edit File".

The DataSET manipulation window should now be displayed.

Note: you can see from these options that you can perform other functions:-

1. View the relevant file.
2. Edit, change and update the contents.
3. Open a completely new file.
4. Rename the existing file.
5. Delete the file altogether.
6. Look at various properties of the file.

3. Save file
DataSET
DataSET

 

Save DataSET From within DataSET do the following:-

1. From the menu bar select File.
2. Select option "Save".

 

        
Creating Antenna Factors
No Function Form Description
1. Select Menu +
View Antennas
Main Menu  
Select of the Details Options Click on the View Details button.

Select the Antenna TAB. You will then see a selection of antennas.

Various Antennas

 

2. Open  DataSET Menu Main Menu
DataSET
 
Select Edit Mode

Right mouse button click within the ICON display section. Then select "Open New File".

The DataSET manipulation window should now be displayed.

3. Select File Type DataSET  

Selection of DataSET Type

Update the file type with Bilog Antenna factor.

Bilog antenna ICON Note that the Bilog Icon will appear ! 

 

4. Update DataSET DataSET  
Title of DataSET ! Enter the title of the Antenna, for example "Bilog".
Set level to "n/a".
Set Distance to "0

These are only required for Specification limits.
Level of DataSET
Amplitude Units Set 'Amplitude Units' to dB. 

 

4. Update Values in
DataSET
DataSET  
Selection of freq Click in the frequency box, where the value .000 appears.

Enter the relevant Value
Level of DataSET Type in 30, hit arrow key right  '>' , then enter the relevant amplitude/level.
Data Entry Press arrow key right '>' twice, then add a further frequency.

Continue with this process till you have added all you points.

 

5. Plot from within DataSET

Upon completion of the DataSET input it may be useful to plot the points to view if you have made any mistakes.  To do this perform the following:-

1. Select Tools from the menu bar.
2. Select Plot.
3. Select Log.

A plot will now appear, see the following example.

Plot of a typical bilog antenna factor.

 

5. Save file
DataSET
DataSET

 

Save DataSET From within DataSET do the following:-

1. From the menu bar select File.
2. Select option "Save".

 

          
Selecting Your New Antenna Factors
No Function Form Description

Open Vasona, and do NOT run a template, you can not select a new antenna factor once a test has begun.

1. Select Antenna in your template Main Menu Open Vasona and select your Radiated Emission Template.
Select of the Details Options Click on the View Details button.

Select the Antenna TAB. You will then see a selection of antennas.

Various Antennas

 

2. Drag Antenna. Main Menu  
Drag + Drop selection of an Antenna Left mouse button click on the antenna icon and drag it to the Antenna symbol. or space.

The next time you run this template this antenna factor will be used.


If there is a Antenna symbol there, this will be updated once you have dropped your new antenna in !.

 

3. Verification of which antenna is loaded. Main Menu  
Icon Properties of a transducer in a template. Move your mouse over the Antenna icon within the "Template Diagram" and your antenna should be displayed in the Menu details.
View File Options from the Template Main Menu To view the contents of the antenna factor, do the following:-

1. Move mouse over the antenna symbol.
2. Right Mouse button Click.
3. Select "View File"
4. The DataSET window should appear

You can now look at the actual values.

 

This training module covers the Final Test methodology, this is required to ensure that the worst case signal has been found with respect to detector, antenna polarity, height and turntable azimuth.
Information
Step Function Form Description
1. Copy relevant results to the Formal List Results The final test routine assesses all the peaks in the "Formal List" section of the results table.   You will need to copy all relevant signals from the debug list to formal list.

vasona24.gif (3562 bytes)

Perform the following:-

1. Right mouse button click on the "Debug list"
2. click on "select all" [This will highlight the entire list.]
3. Repeat right mouse button click and select copy.

Note: if you only want to select a limited number click on each relevant frequency whilst holding down the ctrl key, then perform the copy function..

vasona24.gif (3562 bytes)

To paste the results to the Formal table, do the following:-

1. click on the formal button.
2. right mouse button click
3. select "insert paste"
2. Begin Test Results Select - All Peak Signal Test

1. Select the 'Test' TAB  from the control panel
2. Select 'All Peak Signals'
3. Click on the "Begin Assessment" button.

The "Assessment Control" window is now opened

3. Start Testing Start Testing Click on "start" to begin testing.
4. Test process

Maximise Data

Formal Data

Vasona will now execute the 'Final Test' sequence, this measures each individual frequency in the table. The turntable, tower will be controlled..   The following window appears on completion:-

vasona11.gif (2339 bytes)
5. Store Data Results
+
Save Results Window
vasona13.gif (8415 bytes)

To re-store the current data:-

1. Click on the 'Info' Tab
2. Title of current file.
3. Click on the 'save button' this will bring up the "Save Results Window".

Update Test Results

On this form click on the "Update File" to  re-save the test data.

Note: box 2 will display the title once the data has been saved.

Congratulations, you have completed your first
vasona 'Emission Assessment !!!'

This training modules steps you through a Simple development/debug test. Showing you how to captured data from the spectrum analyser, then store test data on your hard disk.  You can then continue the process to do further measurements.

Looking for Vasona support page !
Information
Step Function Form Description
1. Open Vasona Logon Select from your Windows task bar:-
1. start
2. programs
3. EMiSoft-Vasona

This will open the main menu after first entering your password in the logon window.
2. Select relevant Template

'Radiated-Class B'
Main Menu 1. Move mouse over the "Radiated-Class B" icon
2. Right mouse button click
3. From the pull down menu choose "Select Template"

vasona4.gif (4463 bytes)

Note : Vasona automatically remembers the previous Template you were using.
3. Run Test Main Menu Click on the "Test Button" within the toolbar:-

vasona3.gif (4028 bytes)

This will begin the test process.
4. Equipment Attached Equipment This windows informs you of what equipment is selected and their IEEE addresses !  In this case the equipment connected is as follows:-

Spectrum Analyser : HP8564A, [Ieee address 18]
Tower : EMCO, [Ieee address 9]
Turntable : EMCO, [Ieee address 8]
Polarity Control : EMCO, [Ieee address 1]

The refresh button "polls" the equipment on the IEEE bus and records what is attached.
5. Begin Assessment Results vasona6.gif (5523 bytes)

1. select the "Test" TAB from the control panel
2. click on the "Begin Assessment" button

The "Assessment Control" window is now opened
6. Start Testing Start Testing Click on the "start" button to begin the testing process.
7. Test process

Capture Data
           +
Completion

Vasona will now execute the test sequence, this will capture data from the spectrum analyser, rotate the turntable etc.   The following window appears on completion:-

vasona11.gif (2339 bytes)

Vasona will now find peaks from the Data and store them in the "Debug" list.
8. Store Data Results

Save Results Window
Vasona, Save Data During Test

To store the current debug data:-
1. Click on the 'Info' Tab
2. This is the location where the filename is stored.
3. Click on the 'save button' this will bring up the "Save Results Window".
Vasona, Save Data During Test Enter the Test Results Name, ie "Test Data".

Click on
'Create File'.

Note: box 2 will display the title once the data has been saved.

The other details....
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