Differences

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--- d2:laser_controller [2018/10/16 21:07] – [Table] Michael Radunsky
+++ d2:laser_controller [2019/03/07 17:53] – 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 127: / Line 128: @@
 **Fine Current (knob)**
-The fine current adjusts the diode injection current by ½-1 % of the course control setting.  Use this control for fine positioning of the laser frequency prior to locking.
+The fine current adjusts the diode injection current by ½-1 % of the coarse control setting.  Use this control for fine positioning of the laser frequency prior to locking.
 **Course Current (Scale Dial)**
@@ Line 220: / Line 221: @@
 An 8-pin Hirose connector (see <tabref TECconnectortable> for identity of connectors) carries the signals for the temperature control of the Laser module.  The wiring diagrams are shown in the table below, where 1 (2) refer to stage 1 (2) temperature control, which stabilizes the Laser Housing (Laser Diode). Rth and Rth_Rtn are the two ends of a 10 kΩ [[http://www.analogtechnologies.com/ath10kr8.html|Analog Technologies ATH10KR8 Thermistor]].
-<WRAP round center box 230px>
+<WRAP round center box 230px><tabcaption TEC_connector_pinout| TEC connector pin out>
 |  **Pin**  |  **Signal**  |
 |  1  |  TEC1+  |
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 |  7  |  Rth2  |
 |  8  |  Rth2-RTN  |
-</WRAP>
+</tabcaption></WRAP>
 <WRAP round center box 320px>
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 ====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.