1. New Discriminator Board Test
1. Leading Edge Timing
2. Width of Pulse
Eric Oberla & Heejong Kim

2. New & Slow vs. Old & Fast outputs outputs Input Input Input
New board with slow comparator
Old board with fast comparator

3. New disc. board Features Test Method
Equipped with cheaper comparators.
Physically 1 card contains 2 separate units of disc. board.
Test Method
Use a pulse generator
square pulse: 600 mV height.
~10 ns width.
~2 ns rise time.
2. Split into two and fed to each input of 2 boards.
3. Read-out 8 outputs using HPTDC.
3. Time offset : ch1-ch2, ch1-ch3, ….., ch1-ch8.
Expect small spread.
4. Width of leading and trailing edge.
Expect ~ 10ns width for all 8 channels.

4. Time offset between channels
From New board
RMS : ~300ps
From Old board
RMS : ~25ps
Cf. Distribution for other channels can be found in separate pdf files.

5. Width of output Input pulse width : ~10ns.
From New board
RMS : 2.44ns
From old board
RMS: ~107ps
Input pulse width : ~10ns.
Unstable output width can be seen easily using a oscilloscope.
Need to investigate possible reason.