The test bench described in this
note has been used to verify the ITB
board before the installation in BaBar, and to debug broken boards.
With this test is possible to verify:
The fan-OUT board has been designed to pulse all 96 channels together. Each channel can be selected by switches and 3 different input channels can be used.
The LSA generates the input command
according the BaBar protocol, and reads back the output data.
An external pulse generator is
used to synchronize the LSA and to generate the input command to the ITB
board.
A second pulse generator is used
to produce input data at different rates, and to produce an external trigger
to the LSA.
The input data frequency has been
varied up to 300KHz, which is the maximum rate supported by the TDC chip
with 12 ms latency.
To check the good performance of
the board, the right format of the
output data is read on the LSA
screen.
To connect the LSA 3 different pods are used:
10460A TTL clock pod to input the 59.5MHz clock and the trigger.For the cable length, check the above fig.
10462A TTL/CMOS data pod to send the command to the ITB.
16517-63202 master pod to receive the data from the ITB.