Introduction

These pages describe the operation of silicon strip detectors using the GLAST controller and front-end ASICs. The data acquisition is based on the TEM-VME board.

More information about the system is found in:

• TEM board
• tkrTem software

Switching on

1. Switch on the VME crate
2. The power for the test board is provided by a HP 6629 A power supply. Three channels are needed for the front-end electronics. If the external trigger board is used a fourth channel is needed.
   

   channel	Power	V [V]	i_limit [A]	comment
   1	dvdd	3.0	0.3
   2	avdd2	2.0	0.1
   3	avdd	5.0	0.1
   4	lvdd	3.3	0.2	for trigger board

   
   

   These values are preset in memory one and are recalled by pushing:

   RCL   1   ENTER       # Set the preset values

   If setting the values by hand be very careful. It is not to hard to type 50.0 V instead of 5.0 V.
   In order to set the voltage to zero recall memory 0:

   RCL   0   ENTER       # Set all channels to zero volts

Start the software

Go to the directory where the scripts are. (cd ~/temScripts/lbd). Before doing anything the VME software has to be initialized by running the resman command. This command has to be run every time the VME crate is switch on. The next thing is to start the python interpreter:

>> python2.1

Environment Variables

The software assumes that the following environment variables are set:

TEMDAQ_TTF

Path to find the TTF files (the code to load the FPGA's).

TEMDAQ_DATA

Path where the raw data files are written to.

Scripts and modules

1. Load/initialize TEM
2. Configure test module
3. Inject charge
4. Charge injection/threshold scan

Load and Initialize TEM

1. Load the code for the data-FPGA.
2. Load the code for the L1T-FPGA.
3. Reset the TEM.
4. Create global objects that are usable by other scripts.

Configure test module

Before the detector module is can be used the TEM and the module it self has to be configured. Configuration involes the following steps:

• Enable readout cables.
• Set the address of the last controler for each cable that is enabled.
• Set if the check sum for the data readout is set.
• Configure the controller chips.

Charge injection

Charge injection, threshold and occupancy scans