THIS 22.1
Standard SAE Filter Options
Standard SAE Filter Options
Channel Filter Classes 60, 180, 600 and 1000 are Butterworth filters with the following parameters:
| Filter Class | Cut-off Frequency | Order |
| 60 | 100Hz | 2 |
| 180 | 300Hz | 2 |
| 600 | 1000Hz | 2 |
| 1000 | 1650Hz | 2 |
The gain characteristics are compared with the limits given in BS AU228 in the following four figures:
