Tait TB8100 User Manual

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21 Audio Calibration © Tait Electronics Limited April 2006To calibrate the balanced input and output lines1. Ensure that the Calibration Kit PC is connected to the reciter.2. Select the Reciter Calibration tab, and double-click Balanced LineCalibration. The Balanced Line Calibration Wizard appears.3. Attach an AC millivoltmeter and terminate the balanced output in 600ohms (either using the load on the CTU or looping the balanced output tothe balanced input), and then click Next.4. Adjust the slider in the dialog box until the audio level on the millivoltmeterreads 1 V PP (0.354 V RMS).Note: Click Coarse to roughly adjust the audio level, and once youget within range, click Fine for more precise control over thesettings. To move up or down 10 mVPP , click either side of theslider bar.5. Click Next. The balanced output is now calibrated.6. Note the level of the AC millivoltmeter, and then turn off the 600 ohmload.7. Connect the balanced output to the balanced input. Verify that themillivoltmeter reading is substantially unchanged. (This confirms that theinput provides a 600 ohm impedance.)8. Click Finish. The balanced input is now calibrated.When you have finished calibrating the balanced lines, the icon on theReciter Calibration tab indicates that this task is complete.Calibrating the Unbalanced LinesCalibrating the unbalanced lines adjusts their gain, so that when you set linelevels using the TB8100 Service Kit software, the actual line level correctlyreflects the Service Kit settings. (Refer to the TB8100 Service Kit User’s Manualfor further information.)Equipment ■ CTU■ AC millivoltmeterSetup forUnbalanced LineOut163 4251 Reciter 3 CTU 5 Unbalanced line output2 25-way cable 4 System interface port 6 AC millivoltmeter