I have tried the latest version ( 26 ) of the FEE64 code and carried out some measurements of the Fast Trigger delay from the Pulser signal ( not the Pulser Trigger out ) and observed the following.
The pulser gives a centroid of 28217 in the histogram.
| Threshold setting |
Delay observed at MACB Fast Trigger output (nS) |
| 0x40 |
no Trigger |
| 0x38 |
no Trigger |
| 0x30 |
no Trigger |
| 0x28 |
1200 to 1800 |
| 0x20 |
690 to 860 |
| 0x18 |
505 to 600 |
| 0x10 |
320 to 385 |
| 0x8 |
210 to 270 |
This seems to me to be sensible as the discriminator is only a very simple comparator.
The OR64 ( 0xE ) signal works as True Fast NIM Logic. The OR16s ( 0xC ) logic works as inverse Fast NIM.
The OR64 is derived from the individual masked discriminator outputs. By default the Mask is not set.
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