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Photometer calibration stability
| Photometer | Relative illuminance responsivity | After cleaning | ||
|---|---|---|---|---|
| Nov. 1991 | Nov. 1992 | Dec. 1994 | ||
| 1 | 1.0000 | 0.9998 | 0.9939 | 1.0032 |
| 2 | 1.0000 | 0.9996 | 0.9875 | 1.0056 |
| 3 | 1.0000 | 0.9960 | 0.9926 | |
| 4 | 1.0000 | 0.9991 | 0.9964 | |
| 5 | 1.0000 | 0.9988 | 0.9976 | |
| 6 | 1.0000 | 0.9999 | 0.9977 | |
| 7 | 1.0000 | 1.0010 | 0.9987 | |
| 8 | 1.0000 | 0.9997 | 0.9969 | |
|
| ||||
| Average | 1.0000 | 0.9992 | 0.9952 | |
