The following diagram follows the entire path of the Scanning Interface Unit (SIU) v2.2 PHA Input circuit.

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Notes:

• Scanning Interface Rev 2.2 is printed on the card inside the SIU.
• SEII Rear Panel Connector is that of the computer card.
• The circuit shown is inside the SIU.
• The analog PHA Input pulse from the pulse processor enters the SIU rear-panel through its own BNC connector.
• The op-amp circuits add gain and offset.
• Jumper 7 can be used to invert the pulse.
• The PHA pulse enters the SEII computer card on pin 6.