User's Manual

18 Audio Calibration © Tait Electronics Limited 2005
Audio Calibration
You should calibrate the audio outputs/inputs if the system interface has been
replaced or changed at all.
Note: The balanced and unbalanced lines can be calibrated
independently of each other.
Calibrating the Balanced Lines
Calibrating the balanced lines adjusts their gain, so that when you set line levels
using the TB8100 Service Kit software, the actual line level correctly reflects
the Service Kit settings. (Refer to the TB8100 Service Kit User’s Manual for
further information.)
Equipment ■ CTU
■ AC millivoltmeter
Important: If the reciter you are calibrating has either the product
code TBA4xxx-0A0x or TBA5xxx-0A0x, its balanced line output
is not transformer isolated. Ensure that the line meter you are using
has a differential input otherwise the balanced line output will not
be calibrated properly.
Setup for
Balanced Line Out
Setup for
Balanced Line In
1
6
3
4
2
5
1 Reciter 3 CTU 5 Line output
2 25-way cable 4 System interface port 6 AC millivoltmeter
1
3
7
5
4
2
6
1 Reciter 3 CTU 5 Line output
2 25-way cable 4 System interface port 6 AC millivoltmeter
7 Line input