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Numerical multiplication of different data types


Pepe96

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Hi to all.

I am completely a newbie on this field using LabView and so on and I hope you can give me some answers.

Problem: I need to connect a Bit-error-Rate tester (in following BERT) via LabView with a computer to process the obatined BER.

The problem is, the BERT does not give the BER directly, but the number of errors.

For that I need to calculate the BER using time (used for the BER-measurement), bitrate and errors.

The problem is, that the format of two values is a string and that these two values may vary with a new measurement.

So I need to process them using Numeric operations (muliplication, Division).

I just found a converter, which converts from string to number, but it doesnt work, because anytime I try to connect both signals to the multiplier, it gives me an error and it automatically connects both with each other, instead of connecting both to the multiplier.

I hope I explained well the problem I got and I would greatly appreciate any hints.

Thanks in Advance

Pepe96

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Hi to all.

I am completely a newbie on this field using LabView and so on and I hope you can give me some answers.

Problem: I need to connect a Bit-error-Rate tester (in following BERT) via LabView with a computer to process the obatined BER.

The problem is, the BERT does not give the BER directly, but the number of errors.

For that I need to calculate the BER using time (used for the BER-measurement), bitrate and errors.

The problem is, that the format of two values is a string and that these two values may vary with a new measurement.

So I need to process them using Numeric operations (muliplication, Division).

I just found a converter, which converts from string to number, but it doesnt work, because anytime I try to connect both signals to the multiplier, it gives me an error and it automatically connects both with each other, instead of connecting both to the multiplier.

I hope I explained well the problem I got and I would greatly appreciate any hints.

Thanks in Advance

Pepe96

3714[/snapback]

The Fract/Exp string to number function should work fine for what you are doing, although you may need to adjust the format slightly, depending on how your instrument formats its output.

Use one conversion function for each string. Then wire the number outputs from each conversion function to the math function inputs. To verify what is going on, place a numeric indicator at the output of each function so you can see that it is or isnot working as you would expect.

The auto connect "feature" is probably what is causing you to connect the lines together. Go to Tools >> Options..>> Block Diagram and uncheck "Enable auto wiring." It is handy, but can be frustrating until you get used to it.

Spend some time with the tutorial. It can be very helpful to the newbie.

Lynn

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Hi Lynn,

thanks for your hints I will try them right now.

Regarding the Tutorial: I already passed through the tutorial but it was quite basic knowledge and what I need to do is a bit more complex.

I will let you know, how its going...

Thanks!

Pepe

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