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--- vetoshield:tubes [2011/06/16 12:02] – [Preamps to be fixed] 67.4.150.19
+++ vetoshield:tubes [2014/04/10 10:45] (current) – [Tube Repair, High and Low Voltage, Preamp cards] jeff
@@ Line 1: / Line 1: @@
 ===== Tube Repair, High and Low Voltage, Preamp cards =====
-====Preamps to be fixed====
-The attached excel file is a list of preamp cards that have tested bad but have since been looked at. With most of these cards at least one bad component or connection had been identified. Bad components have also been marked with tape. The cards are in  a box labled "PREAMPS TO BE FIXED"{{:vetoshield:broken_preamp_cards.xls|}}
+====Tube Geometrical Specs=====
+{{:vetoshield:tufts_module.pdf|}}
+\\
+====Preamp Cards====
+===Broken Cards===
+The attached excel file is a list of broken cards that have been looked at. With most of these cards at least one bad component or connection had been identified. Bad components have also been marked with tape. The cards are in  a box labled "PREAMPS TO BE FIXED"
+{{:vetoshield:broken_preamp_cards_updated_jul_28_2011_.xls|}}
+\\
+===Channel Schematic===
+The following is a schematic of a SINGLE CHANNEL on a preamp card. Each preamp has two channels. The LS221 and SN75183 chips are each dual packaged so there is only one of each per card.
+{{:vetoshield:vetoshield_preamp_schematic.jpg?900}}
+===Low Voltage Connector===
+The P ground is the applied ground from the 15 pin low voltage connector. The S ground are the traces that run to the screw holes on the outside of the card and would normally be connected to the aluminum on the shield.
+When looking at the preamp card with the 15 pin low voltage connector on the top the pinout is
+   ____card end_____
+  | SSTTTTTGGGGGG77 |
+  |                 |
+where S and T represent +5S and +5T respectively, G represents ground and 7 represents -7
+\\
+===Charge Injection Test===
+Scope screenshot below is of test with 250mV negative going pulse at 200khz repetition rate\\
+Top trace is nput to TEST pin\\
+Second trace shows signal at pin 3 of LM311\\
+Third trace is +OUT\\
+Fourth trace is -OUT\\
+{{:vetodaq:vetopreamp_130225b.png?700}}
+\\
+===Datasheets for the major components===
+{{:vetoshield:mpsh11_datasheet.pdf|}}
+{{:vetoshield:1n914_datasheet.pdf|}}
+{{:vetoshield:lm311_datasheet.pdf|}}
+{{:vetoshield:ls221_datasheet.pdf|}}
+{{:vetoshield:sn75183_datasheet.pdf|}}
+====Low Voltage Distribution System====
+Below is a schematic of the low voltage distribution system for a given crate.
+{{:vetoshield:low_voltage_distribution.jpg?1000|}}
+The original schematic file which can be edited is posted in the vetoshield ELOG https://fireplace.soudan.umn.edu:8082/Shield/ in entry # 486.
+===Breakout Box===
+Below is a more detailed representation of the breakout boxes being used
+{{:vetoshield:low_voltage_breakout_box.jpg?500|}}
+and some photos
+{{:vetoshield:bob1.jpg?500|}}{{:vetoshield:bob3.jpg?500|}}{{:vetoshield:bob4.jpg?500|}}{{:vetoshield:bob5.jpg?500|}}{{:vetoshield:bob6.jpg?500|}}

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