Using the QA400 Tips

For those of use that use the QA400 FFT,
here are some tips that will help us use the
product and software for measurement.

Press the Ctrl key plus an Axis, Windowing, or Measurement soft switch parameter.

For example, PRESS Ctrl + .dBV brings up a
dialog box to set External Gain & Peak Display Format:


Ctrl + .dBr brings up the following:




Ctrl + .X Lin:




Ctrl + .X Log:



The Measurements soft switch parameters as follows:

Ctrl + .Pwr:



Ctrl + .THD:
OR
Ctrl + THD+N:




Ctrl + .SNR:



Ctrl + .FR:



Generators soft switch functions:
Ctrl + Gen 1:
OR
Ctrl + Gen 2:



To set some of the plot display or markers:
Right Click on the Plot then Select:



To enlarge and area of the plot that you are working with or measuring and need a close
view, Click and Drag the area.

So to zoom in on a 1kHz peak Click
above left about 900 Hz and Drag down
to the lower right about 1200 Hz.

That should give you something similar to the
following:

(Place holder)

To put markers in your plot place cursor
above the frequency(s) and Press M.

To remove only one marker, place
your cursor over it and Press M.

To Delete all your markers Press D.