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| − | The Q-Weak Amplifier Discriminator, termed as QWAD has 48 channels on each electronic board. We would be using 2 QWAD boards per plane. One QWAD will process the signal from all odd strips of the detector, while another processing the signals from all even strips.
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| − | Though functionally the board is capable of operation in both positive as well as negative polarity. We shall be using it in negative polarity with the jumpers on the inner side of each channel ([[Media:QWAD.png| diagram elaborating jumper placement]])
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| − | The QWAD (version-2) being used requires +5,-5 and two GND connections for its power input. We are using two Agilent 3633A LV power supplies to provide the same. The QWAD boards would be attached to the vacuum - can in the tunnel whereas the power supply needs to be behind the Green Wall (2nd rack allocated), which adds a long cable of ~120 feet between the power supply and the consumer QWAD boards. We are using a terminal block ([[Media:Terminal_block_QWAD.pdf|data sheet]]). The terminal block is rated for wires from 10-24 AWG. We are using a 5 conductor 12 AWG cable for carrying 8 x 1.6A (~13A) from one power supply unit delivering +5V and 8 x 0.37A (~3A) from another unit delivering -5V. We use a 22 AWG cable for sense wire.
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| − | == Current Status of QWAD version-2 boards ==
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| − | We have received the following QWAD boards on-site after being mended at TRIUMF.
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| − | * QWAD3: all channels giving digital output, noise rate as seen with and without calibration input was a maximum of 2kHz.
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| − | * QWAD4: ''not tested yet''
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| − | * QWAD6: ch#1,38 have no digital output, noise rate as seen with and without calibration input was a maximum of 2kHz.
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| − | * QWAD8: all channels giving digital output, noise rate as seen with and without calibration input was a maximum of 2kHz.
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| − | * QWAD10: ch# 7,8,11,34,38,45 either do not have a digital output or has a flaky output.
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| − | * QWAD11: ''not tested yet''
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| − | Two more QWADs have been received in Jlab but have not been tested yet.
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