September 30, 2009 online meeting minutes

present: Sergey Boyarinov, S.P., Ben

1. Discr:

• compensate for propagation if possible

• test with different TDC boards and low amplitude pulse, probably triangle shape

• investigate spikes in trigger output distributions (change input frequency etc)

• threshold dependence is very linear for one channel, need to check channel-to-channel dependence, typical must be +-1mv (spec has +-3mv max); slope measured as 0.263, must be 0.25 (maybe scope is not calibrated good enough, Ben will check)

• tdc output pulse width: need to have a calibration on board level to make sure it starts from zero and linear

• trg output width will have 4ns step

• delay for trg is 75-80ns, need as low as possible, will be 15ns in new revision with 4ns step

• OR output works, masks works

• test input to be implemented

• scalers (ungated and gated) to be tested, they resets on read; readout will be the same as JLAB FADCs (DMA readout); gated and ungated scalers must to be latched together - to be implemented

• temperature dependence test to be completed, probably by changing fan speed in VME crate

2. eg6 run

• BONUS electronics: assembling in Hall B under way, will try to make something working tonight; a lot of work to commission electronics and software ...