User Manual

SGD-SB2025NT-TUM, Part 2
Jan 12 Page 43 SOLAR COMMISSIONING
5.2.1.3 Out Audio Level
The audio output level is set using a coarse level control (left slider) and fine level control (right
slider) (see Figure 32 ). The current settings are shown by the marker to the right of the slider and
the value at the bottom.
Figure 32. Audio Output Level adjustment.
When a level change is applied, the marker alongside the slider will turn Blue until the change is
confirmed, whereupon the position of the marker will match that of the slider control pointer and
turn Grey again.
5.2.1.4 Audio Output Setup Process
The audio output level is set using the Test Tone facility, which is described in more detail in
Section 5.2.3.3 – Test Tone .
The following process is used to setup the audio output level:
1. Connect an audio level measuring device to the output port ensuring that a 600 Ω termination
is applied.
2. Invoke the internal ‘Test Tone’ to ‘External’ route ensuring that the test tone level is set to
maximum (0 dB).
3. Adjust the output gain control and fine slider to achieve PSL. (Adjusting the coarse gain
control may cause a momentary effect on the PLL status.)
4. The coarse gain settings are in 3 dB steps from 0 dB down to −24 dB
5. The fine slider gives a 6 dB range of control and each “click” nominally corresponds to a
change of 0.05 dB.
Whilst the preferred method is to set peak levels, it is possible to set the audio output for levels
less than peak as long as the Test Tone output level is set to match. For example, to set a 60%
system level of −10 dBm, set the Test Tone output level to −4.4 dB (60% of peak) and adjust the
output level controls to give −10 dBm.