Nti Audio Fx100 Calculation Items
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Hello and welcome to this video session,
in which I want to introduce you to an outstanding feature
of the FX100 Audio test system,
the 'Calculation Items'.
In your professional life you have certainly encountered situations
where the standard functionality of your test system
does not offer the exact kind of analysis that you require.
For instance, you may want to combine different results in a single curve
or display the acquired data in a specific way.
For such cases, the FX-Control suite offers programmable objects,
called 'Calculation Items',
which allow you to customize the processing of your measurement data.
Let us for instance determine the output power of an audio amplifier.
For this purpose, we need a load resistor
that is connected to the SIH option of the FX100.
This allows us to acquire the two basic measurements,
the Voltage across the load,
and the impedance response of the load.
Now we have to create and define the Calculation Item.
Press the corresponding button in the 'Worksheets' ribbon,
then add the required parameters; they can be optionally re-named.
As soon as all parameters are available,
the calculation formula has to be established.
Finally, you can assign a unit
to the calculated result;
FX-Control therefore provides a selection
of the most frequently used units.
Place the new Calculation Item on the work area
and adjust the panel size if you like.
The graph shows the acquired result data in the correct unit, [W].
Now, as the setup has been established and adapted,
you may want to introduce tolerance limits.
They allow to verify, whether the tested amplifiers
actually meet the given specifications.
For this purpose, we have to save the nominal output power curve as a reference.
Next, we subtract for instance -0.5 W headroom from this reference,
thus getting the lower limit curve.
The limit curve can be shown in the measurement result graph.
Finally we create a special Calculation Item that compares the lower limit
versus the acquired power result,
and shows the outcome in a PASSED / FAILED panel.
The example has shown how Calculation Items assist you
in getting customized data beyond the standard range
of Audio measurements.
FX-Control actually supports a wide range of mathematical functions, such as
standard arithmetic operations
calculation with variables
unit conversion
smoothing or interpolation
statistics
or Boolean algebra.
For further information
please take a look at the FX-Control help file
or contact your nearest NTi application specialist.
Thank you for your attention and see you again soon
