Select the channel number you want to use for the measurement using the dropdown list labeled âSelect Channelâ (Figure 3.9). âCh nâ denotes channel n where n = 1, 2, ... [[NeoScan]] Optical Bench Manager program opens up with the âCh 1â as the default working channel.
</p>
Â
<center>[[Image:neoscanfig_3_9.png|thumb|center|600px|<i><b>Figure 3.9</b>: Selecting the working channel from NeoScan Optical Bench Manager window.</i>]]</center>
</li>
<li>
</li>
</ol>
Â
<center>[[Image:neoscanfig_3_9.png|thumb|center|600px|<i><b>Figure 3.9</b>: Selecting the working channel from NeoScan Optical Bench Manager window.</i>]]</center>
If the polarization is maintained, the total return power and the polarization power will lie within the specified optimized range (the default value is ±20%). In this case, âOptimization Indicator LEDâ becomes green. Otherwise, it start blinking and the information panel indicates: âPolarization is not maintained: Optimization is required.â A user can change the threshold from the box labeled âAuto Trigger Marginâ (see Figures 3.7 and 3.8). If the power difference is greater than 20%, the polarization state is found not to be maintained, therefore, the user will be prompted with a dialog window giving an opportunity to initiates the optimization process or skip the optimization by choosing âNo.â