Differences

This shows you the differences between two versions of the page.

--- d2:laser_controller [2018/11/26 19:53] – Michael Radunsky
+++ d2:laser_controller [2019/03/20 01:01] – Michael Radunsky
@@ Line 32: / Line 32: @@
 </WRAP>
+=====Purchase Includes:=====
 <WRAP group>
 <WRAP half column>
-=====Purchase Includes:=====
   * D2-105 Laser Controller
   * D2-007 Laser Controller Breakout Board (See <imgref 007>.)
@@ Line 46: / Line 47: @@
 </WRAP>
 <WRAP half column>
 <WRAP round box 250px><imgcaption 007|D2-007 Breakout board.>{{ :d2:d2-105:d2-007.jpg?200}}</imgcaption>
-</WRAP>
+</WRAP></WRAP>
-</WRAP>
 ===== Absolute Maximum Ratings =====
@@ Line 328: / Line 326: @@
 To reset the temperature loop parameters to the approximate settings for a Photodigm TOSA DBR Laser:
   - The T1 loop is not used as the TOSA only has one TEC.
-  - Set the dip switches to the configuration shown in <tabref factory_set2_post6987_TOSA>.
+  - Set the T2 dip switches to the configuration shown in <tabref factory_set2_post6987_TOSA>.
   - Measure the resistance across GND5 and probe point GAIN2. Set this resistance to between 1.01 kΩ and 1.03 kΩ by adjusting trimpot PROPGAIN2.
@@ Line 387: / Line 385: @@
 ====User Control of the Poles and Gain====
-If you remove the right side panel on the Laser Controller, for each stage of temperature control, you will see the panel shown in <imgref side_adjustb>. The set of click switches labeled "Integral" controls the PI (ω<sub>1</sub>) pole. Clicking the first switch, labeled "proportional," into the on position removes the integral gain. If the "proportional" switch is in the off position, then the sum of the times for all switches in the on position gives the RC time-constant for the PI pole. For example, if the 2<sup>nd</sup> (0.47s) switch and the 4<sup>th</sup> (2.2s) switch are in the on position (and the rest off), then the time constant is 2.7s and ω<sub>1</sub> = 1/2.7s = 0.37 Hz.
+If you remove the right side panel on the Laser Controller, for each stage of temperature control, you will see the panel shown in <imgref side_adjustb>. The set of click switches labeled "Integral" controls the PI (ω<sub>1</sub>) pole. Clicking the first switch, labeled "proportional," into the on position removes the integral gain (but not the differential gain). If the "proportional" switch is in the off position (integral gain is now on), then the sum of the times for all switches in the on position gives the RC time-constant for the PI pole. For example, if the 2<sup>nd</sup> (0.47s) switch and the 4<sup>th</sup> (2.2s) switch are in the on position (and the rest off), then the time constant is 2.7s and ω<sub>1</sub> = 1/2.7s = 0.37 Hz.
 Similarly, the switches labeled "Differential" control the D (ω<sub>2</sub>) pole. If the first switch, labeled "Diff On" is in the off position, then there is no differential pole. If the "Diff On" switch is on, then the D pole has an RC time-constant given by the sum of the times of all the switches in the on position, same as with the Integral bank of switches.