Differences

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

--- photon_counter [2025/01/23 11:16] – temp reno
+++ photon_counter [2025/09/16 11:49] (current) – reno
@@ Line 1: / Line 1: @@
 ====== Photon Counter Board ======
 The photon counter board is used to count the intensity count coming from the [[pmt|PMT]].
+<hidden Schematic>{{:boards:photon_counter_schematic.jpg?600|photon counter board schematic}}</hidden>
+<hidden Board Assembly>{{:boards:photon_counter_pcb.jpg?600|photon counter board assembly}}</hidden>
+<hidden Wiring Harness>{{:boards:photon_counter_wiring_harness.jpg?600|photon counter board wiring harness}}</hidden>
 ===== DB9 Connector =====
 The DB9 Connector going from the PMT to the photon counter board
@@ Line 18: / Line 20: @@
 |NC|8|Ground|
 |NC|9|-8V|
+{{ :boards:photon_counter_db9.jpg?600 |Photon Counter Board DB9 Pin numbers}}
+**Note:**
+  * Pin 1/6 a twisted pair
+  * Pin 2/3 is a twisted pair
+  * Pin 2/3 twisted pair is the only signal wire that is actually used for counting, Pin 1/6 is not used
+===== Testing The Board =====
+==== Materials Required ====
+  * Oscilloscope
+  * Signal Generator
+  * Testing Jig (Optional, but see below)
+**Test Jig**\\
+The test jig can be made with a male to female DB9 connector with pin 1, 2, 3, 5 and 6 connected (1/6, 2/3 should be a twisted pair). Pin 2 and 3 should be easily disconnected with something like a wago or a terminal strip.\\
+Example of test jig
+{{ :pictures:photon_counter_jig.jpg?600 |}}
+==== Testing ====
+=== Photon Counter Clock ===
+  - Turn off the brewer
+  - Disconnect the DB9 connector from the photon counter board
+  - Hook up one of your oscilloscope lead to pin 5 of the DB9 connector
+  - Turn on the brewer
+  - Wait for the instrument to start up with the shutter click (It it does not, you may have to start up dosbox on the computer)
+  - The signal coming out of  pin 5 of the harness which sets the clock for the PMT should be about 7.6Hgz at 87% positive duty cycle.{{ :pictures:pcb_maingate_op.jpeg?600 |Photon counter main gate signal output}}
-===== Headline =====
+=== Photon Counter Counting ===
+  - Turn off the brewer
+  - Remove the db9 connector from the photon counter board
+  - Connect a signal generator to pin 1
+  - Inject 3.8VDC square wave at 10Khz
+  - In dosbox, enter [[mm|MM]]
+  - run <key>R,0,7,1;o</key>. You should be getting about 13,000 counts across all 7 slits.
+<konsole Dosbox>R,0,7,1;O  #With no lamps on and with the DB connector disconnected
+,      0,      0,      0,      0,      0,      0,      0
+R,0,7,1;O  #with injecting a 3.8VDC square wave at 10KHz onto pin 3
+,     2726,     2715,     2661,     2708,     2581,     2630,     2756
+</konsole>
+=== PMT Output ===
+  - Turn off the brewer
+  - Connect the test jig between the PMT and the Photon Counter board
+  - Turn on the brewer
+  - With your oscilloscope, measure pin 2 and pin 3.
+  - Run [[ze|ZE]][[b2|B2]]
+  - The output of the oscilloscope should look something like the following {{ :pictures:pmt_lamps_on_scope.jpeg?600 |Oscilloscope output from Pin 3 and pin 2 of the PMT db9 harness with lamps on}}