Controls: Calibration Menu >> User Units >> User Line
Macro: UserMicLoad

This button is only enabled for lines with calibrated attenuators.

Click this button to load a calibration file for the current User Line. The standard Windows Open dialog will appear, showing the available .CAL files. When you have selected a file, this button will be shown depressed and the button label will change to the name of the file.

File values will be used to set Units/Volt and Units Name, and those controls will be disabled in this dialog.

To remove the .CAL file assignment for the line, either so you can replace it with another or to allow use of the Units/Volt and Units name controls, click on the filename button. You will be prompted to confirm removal. This won't affect the file itself; it will just be unloaded so it no longer applies to this line.

When no file has been loaded, the button will change between 'Load Mic Cal File' for input lines and 'Load Spkr Cal File' for output lines. If you have some other type of transducer just consider that 'Mic' means 'Input' and 'Spkr' means 'Output'.

There is a fundamental difference in how Mic and Spkr (or Input and Output) .CAL files are applied. Consider a file that shows a flat response except for a peak centered at 2 kHz. If it is a Mic .CAL file, that means that the mic puts out a larger signal at 2 kHz, so to compensate for that Daqarta will reduce the observed response accordingly; the overall system will behave as though the mic had a flat response.

Now suppose that same file is used for a Spkr. That same peak means that the speaker puts out more sound at 2 kHz. So if you are driving that speaker with the Daqarta Generator and want to see what the output of the speaker looks like, Daqarta has to boost the spectrum display of the raw output to make it match the real acoustic output.

But there is another use for a Spkr .CAL file: You can use it as above for an output, then measure a system response to that stimulus on an input line. Assuming that the system responds linearly to the stimulus, it would show a peak corresponding to the peak in the output. If you select Use Speaker Cal File on the input line, the peak will be reduced to show what the response would be with a perfect speaker.

Macro Notes:

Use the same UserMicLoad command for loading either Mic or Spkr CAL files, depending on the User Line selected.

If the relevant User Line dialog is open, UserMicLoad= without a name will pop up the File Open dialog showing all CAL files, but with no default name.

UserMicLoad="MyFile" will pop up the File Open dialog with the default name set to MyFile. (Note that quotes are needed around all filenames in macros.) If you accept this by hitting Enter or the Open button in that dialog, Daqarta will assume you want to open a file named MyFile.CAL and will fail if that file is not found.

A.UserMicLoad="MyFile" will open MyFile.CAL directly, without any File Open dialog. Note that this will replace any existing file for that line.

UserMicLoad=">Field1" will use the contents of Field1 as the default file name, and A.UserMicLoad=">Field1" will open a file of that name directly.

However, it is usually more useful for a macro to load CAL files directly, without the User Line dialog open. This requires that you specify which line the macro refers to. This is done via Uxx. prefixes before the macro command, as in A.U0L.UserMicLoad="MyFile".

Prefixes U0L. through U7R. specify Input lines 0-7 and the Left or Right channel of each.

If your card has only Master Input lines, UIL. or UIR. prefixes will specify them here.

If your card has only Master Output lines, specify them with UOL. or UOR. prefixes.

Otherwise, UWL. and UWR. prefixes specify Wave Out lines.

If a data file is open, UIL. and UIR. prefixes specify Left and Right Input lines, while UOL. and UOR. specify Output lines.

See also User Units dialog, User Line Dialog

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