Table 3
Monitor and control functions implemented in the EMIR system.
| Subsys | Function | Ch/mod | Mods | Type |
|
|
||||
| Opt. | Carousels | 1 | 2 | Step mot |
| Dichroics | 1 | 1 | Step mot | |
| Ambient Temp | 1 | 2 | Temp sens | |
|
|
||||
| Mxrs | Junction bias | 4 | 4 | D/A + A/D |
| Josephson coils | 4 | 2 | D/A + A/D | |
|
|
||||
| LO | Gunn osc tuning | 2 | 4 | DC servo |
| Attenuators | 3 | 4 | DC servo | |
| Harm mxr bias | 1 | 4 | D/A + A/D | |
| PLL IF level | 1 | 4 | A/D | |
| Gunn bias | 1 | 1 | D/A + A/D | |
| PLL err volt | 1 | 4 | A/D | |
| PLL loop gain | 1 | 4 | D/A + A/D | |
|
|
||||
| IF | Bias monitor | 4 | 4 | A/D |
| Attenuator | 4 | 4 | 4-bit I/O | |
| IF level | 4 | 4 | A/D | |
|
|
||||
| Cryo | Temp sensors | 8 | 1 | A/D |
| Vacuum gauge | 1 | 1 | A/D | |
Notes. Some abbreviations have been used because of width limitations. Step mot: stepper motor; Temp sens: temperature sensor; Mxrs: SIS mixers; D/A: digital to analogue converter (and conversely); Gunn osc: Gunn oscillator; DC servo: DC servomotor; Harm mxr: harmonic mixer; PLL: phase lock loop; err volt: error voltage. “Josephson coils” is shorthand for the coils that generate a magnetic field to suppress the Josephson effect in the superconducting junctions.
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