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"Temperatures" brings up:
   
 
The SVT Temps and ECAL Temps bring up:

Note the "SVT DAQ Heartbeat": if this reads "dead", then the values on the GUI are old and not updated. 

Check if the SVT DAQ is still running.

• If the SVT DAQ is down this is normal. Check how long it will be down and if you should power down the SVT.
• If SVT DAQ is ON and it has OK status: call the expert.
• If SVT DAQ is down and you didn't turn it off: call the expert
• Check that the temperature on the inlet and outlet of the vacuum box is normal

Pay attention as you need to determine the status of the system to avoid damaging temperature to the SVT. If unsure; call the expert.

The Ecal temperatures should be around 70F.

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You should see currents on DVDD (~250mA) and AVDD(~350mA but sometimes ~500mA). The current on V125 will often be zero until the DAQ has configured the chips. The bias should ramp up and you should see it stopping at 180V.

One special feature is that the DVDD power is coupled between two hybrids (0&1,2&3, and so on). Thus you will see DVDD current of the other hybrid ON even though that hybrid is not "ON". This is expected and normal behavior.

Turning power OFF

Make sure that the box to the right of the OFF/ON buttons are GREEN.

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You should see all low voltage currents and high voltage bias ramping down.

One special feature is that the DVDD power is coupled between two hybrids (0&1,2&3, and so on). This means that powering down always results in powering down BOTH hybrids. This is expected and normal behavior.

Turning on BIAS voltage for all modules on the SVT

Never do this without explicit instructions from an expert!

Find the GUI for the SVT voltages.

There is a box in the upper right corner "Bias Voltage Setpoints". Input your new bias voltage value and hit Enter. This will propagate this voltage to all SVT modulels.

To turn bias on individually please look at the section below.

Alarm Handler

To be filled.

What to look for:

Alarm panel

Interlock signal

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The applied voltages for the low voltage supplies are hard-coded and cannot be changed.

Nominal low voltage currents during normal operations/data taking:

High voltage bias for the SVT

High voltage should be at 180V during normal operations/data taking.

Changing high voltage bias values is an expert only action.

Expert Only

Changing voltages

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In EPICS control gui we can click the button to the right saying "Hybrid x" (x=\[0,9\]) and a new GUI pops up showing more options.

To set the voltage there are three columns to pay attention to:

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Measured V: measured voltage

Only the bias voltage can be changed; the low voltages are "hard coded".

Changing the bias voltage

This should only be done by expert!

1. Open the hybrid view of the particular hybrid you want to change.

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