The Technical Stuff
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Maintenance Information
Line Trim Procedure
To calibrate the analog inputs, a digital signal meter and an accurate analog reference generator with
low impedance outputs are required. To calibrate the analog outputs, a digital signal generator and an
accurate analog dB level meter with balanced inputs are required.
Analog line inputs calibration procedure:
1.
Connect the analog reference generator to the left analog input channel of the 2192.
2.
Connect the digital output of the 2192 to the digital signal meter.
3.
Set the reference generator to output a 1kHz sine wave at the desired nominal signal level.
The factory setting is +4dBu.
4.
Adjust the input trim until the desired RMS digital level is obtained. The factory setting is
-18dBFS.
5.
Repeat these steps for the right channel.
Analog line outputs calibration procedure:
1.
Connect the digital tone generator to a digital input of the 2192.
2.
Connect the left analog output channel to the analog level meter.
3.
Set the digital signal generator to output a 1kHz sine wave at the desired nominal RMS signal
level. The factory setting is -18dBFS.
4.
Adjust the output trim until the desired analog output level is obtained. The factory setting is
+4dBu.
5.
Repeat these steps for the right channel.
Before adjusting the factory calibration levels, make sure your equipment reads the
current calibration values correctly! If your equipment does not match the factory
settings, you will need to find out why before you proceed with recalibration.
