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--- tuning_the_s800_xdt [2015/10/22 16:43]
pereira
+++ tuning_the_s800_xdt [2015/10/22 16:48]
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@@ Line 162: / Line 162: @@
   * There are three electronic "sources" with time information for ToF calculation: Tennelec TACs, Phillips TDC, and Mesytec MTDC.
-  * Although the ToF reference ("start") in these three sources is given by the FP scintillator E1 up, the electronic path from the detector to each module is different (see {{:wiki:s800electronicstschematics-to20150907.pdf|main electronics diagram}} for more details)
+  * Although the ToF reference ("start") in all the ToF modules is given by the FP scintillator E1 up, the electronic path from the detector to each module is different (see {{:wiki:s800electronicstschematics-to20150907.pdf|main electronics diagram}} for more details)
-  * The OBJ, XFP, and E1 up signals in the MTDC come from the Mesytec MCFD
   * Before going to the ToF modules, the OBJ and XFP signals are sent to a CANBERRA CFD 454 CFD in data U6 from the data-U6 patch panel (OBJ: patch panel #54, XFP: patch panel #1)
   * MTDC:
-      * The OBJ signal into the MCFD comes directly from the detector via S3 patch panel #94 (going to the target area)
+      * Before getting into the MTDC, the OBJ, XFP, and E1 up signals in the MTDC go through a Mesytec MCFD
+      * The OBJ signal into the MCFD comes directly from the detector via S3 patch panel #94 (i.e., there is no signal to check in data U6)
       * The XFP signal into the MCFD module comes from data-U6 patch panel #70, connected to the CANBERRA 454 CFD XFP output
       * SpecTcl calculates the ToF by substracting the MTDC time from XFP (MTDC channel 2) or OBJ (MTDC channel 3) to the MTDC time from E1 up (MTDC channel 15)

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