Science Requirements Document
Section 4 of 4
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The nominal gain and discriminator values are given below. Actual values should be requested from Thomas L. Garrard.
| Table 12 -- Gain and Discriminator Values | ||
|---|---|---|
| detector name |
normal full scale (MEV) |
normal discriminator (MEV) |
| LE1 | 307 | 9.6 |
| LE2 | 307 | 2.0 |
| LE3 | 2048 | 26. |
| LE4 | 6144 | 120. |
| LE5 | 6144 | 120. |
| LB1 | 307 | 0.5 |
| LB2 | 307 | 0.4 |
| LB3 | 2048 | 4.0 |
| LB4 | 50* | 2.0 |
| * Pre-amp full scale; not connected to an analyzer. | ||
| LET E -- Slant SB: | ||
| low gain -> LE1 + LE2/2 + LE3/10 + (LE4+LE5)/25 = 9.6 MeV | ||
| LET B -- Slant SLB: | ||
| LB1 + 0.42*L2 + 0.20*L3 = 9.6 MeV | ||
Both events and rates go though one stage of buffering in the instrument and another in the GAB. Study the cal stim printouts to see the 2 minor frame delay in the readout here. More buffering must be done in the CDS (spacecraft); this is almost certainly one minor frame. This must be understood so that correlation or rate readout and angle from the AACS can be done.
Figure 9 shows accumulation time and readout time of rate data. It also shows two extreme possibilities for event time and event readout; one event readout with minimal buffering delay and one with a maximum delay due to all six event polling buffers being full. The AACS is readout with no delay as shown in the figure.
