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RadiMation Application Note 123
RadiMation Application Note 123


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Implementing Switch Matrix design in RadiMation®[edit]
This application note describes how to implement a switch matrix design into RadiMation®. It's purpose is to help to make a translation from the design on paper to implementing that design in RadiMation®


= Implementing switch matrix design in [[RadiMation|{{RadiMation}}]] =
This application note describes how to implement a switch matrix design into [[RadiMation|{{RadiMation}}]]


When making a test setup it can be needed to switch to different equipment for different settings or frequency ranges. This is supported in [[RadiMation|{{RadiMation}}]] by being able to make a specific driver for a switch matrix to be used in a specific test-site. Later in this text this will hopefully become more clear.


A switch matrix design is normally a drawing or something like a excel sheet. It will tell you what is connected when the relays are in a certain state. The relays normally can be in two modes. Normally open and Normally closed.


Open means that the switch is off and closed means that the switch is on. When we have the switch matrix design we know the signal flow and which switches need to be set to create the desired signal path.


Pre Wait Time
Wait time before starting the measurement-loop. Can be used to wait for a signal generator, and or amplifier to stabalize.
Measure
The minimum ammount of measurements in the measure loop. Continues to loop even if power level is stable.
Wait Time
The wait time before each measurement is taken, during the measurement-loop.
Max. Difference
If the measured power between each measurement in the measurement-loop, is less than this value. The measured power is stable. The loop will stop.
Max. Measure
The maximum ammount of measure times, for the measurement-loop


As can be seen on the screenshot. Both leveling, and monitoring settings can be set. The leveling is used, whenever RadiMation is measuring the power, to regulate the signal generator. For example, if you have a immunity power closed loop method. This will regulate the signal generator until certain power is measured. In this case, the leveling settings are used. If the powermeter is used as input. For example in the immunity multiband test, in the inputs table. Then the monitoring settings are used.
== How to use the switch matrix ==
The leveling settings (for regulating the signal generator) should in general be set to measure quickly. This is because: If the measurement is slow, then this delay is multiplied by the amount of measure times the signal power regulation is needing. The monitoring settings on the other hand, can be in general set to a "slower"/"more accurate" measurement. Since that delay is not multiplied.


Example[edit]
 
See the measured power graphs above. From left to right: Turning carrier on, change carrier up from -30 to -10, change carrier down from -10 to -20 dBm. We will use this information to determine the powermeter settings. The graphs are related to the output level of the signal generator, therefor we set the Leveling measurement settings.
Pre Wait Time:
From the 3 graphs, it takes at least 15ms before any of the output levels is stable. We therefor set the value of 15 ms as pre wait time.
Measure:
We measure 2 times. We check 2 measurements to be within the stable tolerance.
Wait Time:
In the graphs, it can take up to 30+15 ms before the output level is stabilized. To be safe, we will use 80ms maximum time to stabilize the output level. See Max Measure times: We should measure 8 times maximum. We then divide this 80 milliseconds over 8 times. Which means 10 miliseconds wait time per measurement.
Max. Difference:
When the output level is stable, the power is very less fluctuating. We could set the "Max difference" to 0.1 dB.
Max. Measure:
We should measure a maximum of 80ms. We take 10ms for each measurement. We should therefor measure 8 times maximum.
If during a leveling, the carrier going up and down a lot. Then the measure-loop is going to fast, and should be slowed down.
If measurement is slow, you can reduce the delays between measurement, or allow a lesser stable output. Make sure (see first point) its not too fast.


Once the settings have been configured, you may test these settings using the RadiMation free powermeter window. In the logging tab, and Main sub tab, testing output can be found. Here you will find the actual required measure times, time, and allowed difference.  
To use a switch matrix you need to add them with the needed settings to the test site.


Below we will explain an example use-case scenario. We have chosen to show how to implement a specific scenario instead of explaining all the different steps in the process. This is because it is very case specific how you would set it up.




Warning:
By explaining a scenario you get an idea why it is set-up in a specific way
With the available settings, you can make measurements very slow. In some cases, you can end up in measuring noise. Then the maximum measure times will be used, since the power level in noice, is not stable. You may need to decrease the Max. Measure value in that case.
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You have a RI test that you need to set up. The path and devices needed in the different bands need to be different, also we want to use the same measurement equipment for both paths. This means that you need to make two test sites.
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One for the low range and one for the high range. In this way you can select the right test-site for the frequency range you are working on. If the test-site is properly set up it will automatically set all the relays need to create the path requested.


This page was last edited on 20 March 2019, at 11:43.Privacy policyAbout RadiWikiDisclaimers
 
Let us further specify the scenario:
 
 
We have two ranges with the following equipment:
 
 
80 MHz-1 GHz
 
AMP 200w 80 MHz - 1 GHz
 
Coupler 80 MHz - 1 GHz
 
Antenna 80 Mhz- 1 Ghz
 
1 GHz - 3 GHz
 
AMP 200w 80 MHz - 1 GHz
 
Coupler 80 MHz - 1 GHz
 
Antenna 80 Mhz- 1 Ghz

Revision as of 15:16, 7 June 2019

RadiMation Application Note 123


Implementing switch matrix design in RadiMation®[edit]

This application note describes how to implement a switch matrix design into RadiMation®

When making a test setup it can be needed to switch to different equipment for different settings or frequency ranges. This is supported in RadiMation® by being able to make a specific driver for a switch matrix to be used in a specific test-site. Later in this text this will hopefully become more clear.

A switch matrix design is normally a drawing or something like a excel sheet. It will tell you what is connected when the relays are in a certain state. The relays normally can be in two modes. Normally open and Normally closed.

Open means that the switch is off and closed means that the switch is on. When we have the switch matrix design we know the signal flow and which switches need to be set to create the desired signal path.


How to use the switch matrix[edit]

To use a switch matrix you need to add them with the needed settings to the test site.

Below we will explain an example use-case scenario. We have chosen to show how to implement a specific scenario instead of explaining all the different steps in the process. This is because it is very case specific how you would set it up.


By explaining a scenario you get an idea why it is set-up in a specific way

Scenario:

You have a RI test that you need to set up. The path and devices needed in the different bands need to be different, also we want to use the same measurement equipment for both paths. This means that you need to make two test sites.

One for the low range and one for the high range. In this way you can select the right test-site for the frequency range you are working on. If the test-site is properly set up it will automatically set all the relays need to create the path requested.


Let us further specify the scenario:


We have two ranges with the following equipment:


80 MHz-1 GHz

AMP 200w 80 MHz - 1 GHz

Coupler 80 MHz - 1 GHz

Antenna 80 Mhz- 1 Ghz

1 GHz - 3 GHz

AMP 200w 80 MHz - 1 GHz

Coupler 80 MHz - 1 GHz

Antenna 80 Mhz- 1 Ghz