Hints and Tips for the MaPMT teststand

The DAQ does not run because of QDC communication error ?

You need to open up Labview (Automation and measurements shortcut) and open the communication.

  • Open the devices and drivers tab
  • Right click the VXI system 0
  • Restart device 277 - the QDC (V792QDC) and also 275 CAEN (275V2288 CAENET) controller

When I run the DAQ the firmware version is zero and the DAQ just prints ---- many times ?

  • The communication is faulty - check the crate is open and relaunch the communication as above.
  • If operating correctly 2052 should be printed for the firmware version

Visual C++ gives errors and does not build the project

  • You can only have one instance of the project running at once. If multiple instances run, Visual C++ gives strange warnings

When I run the DAQ it prints 'Buffer is not empty and not full'. Is this a problem ?

  • Good this is normal

Where is the DAQ project

  • It is in D:s1139056\first year work\QDC-code
  • Then open up the project final for visual C++ (LowReg_MSVC)

Where is the stepper motor code ?

  • It is in D:s1139056\first year work\stepper motor
  • Then open up the project final for visual C++ (LowReg_MSVC)

The setup is noisy ? What do I do ?

  • The stepper motors introduce noise. Turn them off when you take data !
  • Check the grounding of everything

The pedestal and signal are not well separated by a valley

  • Check the LED voltage is low
  • Check the gate width - a value of ~30 ns seems ok
  • Check the position of the gate relative to the signal. It should ~ 10 ns inside the gate. This seems quite critical

What voltages should be applied on the LEDs

  • The right should display should read 5 V
  • The left should be adjusted to have mainly single photon signals on the scope. ~ 3.2-3.5 V seems optimal

Example pictures from the setup

workingsetup22000.png Screenshot of gate and signal relative to gate on scope png
N_11_06_3.30_06.png Fit of the signal on a partially illuminated pixel with the gate above png

Topic attachments
I Attachment History Action Size Date Who Comment
PNGpng N_11_06_3.30_06.png r1 manage 131.0 K 2013-06-13 - 15:00 MatthewNeedham  
PNGpng workingsetup22000.png r1 manage 103.3 K 2013-06-13 - 14:49 MatthewNeedham  
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Topic revision: r4 - 2013-06-13 - MatthewNeedham
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