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The 8420 card is intended as a solution for situations with rotating machines where positional information and time relative to position information are required. This would classically be a very high speed shaft encoder with a fine resolution. This card is used in applications where there is a requirement to accurately measure rotational speed at several points in a drivetrain. The high speed and resolution of this card mean it is suitable for in-depth rotational machine analysis such as torsional and angular vibration. The 8420 card measures the time between pulses with a 16ns resolution.
| Description | 4ch Advanced Tacho |
| Tacho input channels | 4 |
| Tacho input range | ±28V |
| Absolute max input range | ±50V |
| Slope selection | +ve, -ve |
| Dynamic noise rejection | Yes |
| Resolution | 16.6ns |
| Connector | BNC |
| Power usage (worst case) | 1.3W |