Latchup Status

• Check if the status on the Silicon Slow monitoring computer looks normal:

This is NORMAL

This is NOT NORMAL the currents of the -3.3V are out of range and a red button shows up

• In normal operation this button can turn red and back to green again every 5 minutes
• If it stays red then it is time to call a Silicon expert

Starting the Latchup test module

• Goto the Silicon Slow Monitoring computer
• Locate the FEC PS control panel

• Make sure N-ring is selected
• Hit on button
• After about 10 seconds all the voltage buttons should appear for N-ring
• Be patient
• All buttons should turn green
• Locate Bias Power Supplies Control
• Make sure N-ring is selected
• Set V Setting to 80
• Hit Ramp Up button
• A window should pop up saying that bias is going to be ramped up
• Hit OK
• A window should pop up showing ramping up of the bias
• Voltage/Current under N-ring should show 80V/~8mA after a while
• Be patient

Stopping the Latchup Module

• Goto the Silicon Slow Monitoring computer
• Locate Bias Power Supplies Control
• Make sure N-ring is selected
• Hit Ramp Down button
• A window should pop up showing ramping down of the bias
• Locate the FEC PS control panel
• Make sure N-ring is selected
• Hit off button
• After about 10 seconds all the voltage buttons should disappear for N-ring
• Be patient