| | 1 | = Second Microtest Set = |
| | 2 | |
| | 3 | This data set consisted of two exposures taken with the default voltages, one with the microtest 05 voltages (SW_L = default - 1.0 V, SW_H = default - 1.0 V), and six others that vary only SW_L or SW_H (with the other set to the default value). To study the impact of these changes, I reduced the data as before, and found the best fit lines in the dx and dy offsets as a function of instrumental magnitudes. The data were binned using 0.1 magnitude bins, and the fit performed between -14 and -12 (other fits were performed using ranges (-16:-14) and (-12:-10), but are not shown here). |
| | 4 | |
| | 5 | The following images show the best fit slopes as a function of voltage in both dx and dy directions, with the dy data providing a control. These show convincingly that SW_L has little effect on the slope within this range, but SW_H values below -0.5 decrease the slope significantly. Comparing the 2-phase and 3-phase devices show that the 3-phase devices have generally acceptable slopes regardless of SW_L and SW_H. |
| | 6 | |
| | 7 | || OTA33 / 3-phase || OTA34 / 2-phase || |
| | 8 | || [[Image(SW_tests_OTA33.png)]]|| [[Image(SW_tests_OTA34.png)]] || |
| | 9 | |
| | 10 | [[Image(SW_tests_montage_big.png,1024px)]] |
| | 11 | |
| | 12 | |
| | 13 | * [wiki:GPC_BrightStarAstrometry_Microtest Return] |
