After a recent avionics install, my tach time is incorrect and fluctuates while operating.
For example, on today's flight, I started with 564.4 Dynon Hobbs Time, and 487.8 Dynon Tach Time.
Midflight, the Dynon Hobbs was 566.4 (2 hrs) and the tach time fluctuated between 489.1 and 490.3 (1.3 hrs and 2.5 hrs)
The tach time does not fluctuate at startup. The fluctuation is every second or so and starts at a delta of 0.1, and grows.
In this flight, right before shutdown, I ended with 567.6 Dynon Tach Time (3.2 hrs) and the tach time fluctuated between 490.0 and 492.1, representing 2.2 hours and 4.3 hours) - neither of which is correct. This was a X/C flight at a constant 2400 RPM (with the EMS set to a cruise RPM of 2400), so the Tach time should closely match the Hobbs.
The tachometer is steady and seems fine.
What could be causing this?
Thanks,
- Ben
For example, on today's flight, I started with 564.4 Dynon Hobbs Time, and 487.8 Dynon Tach Time.
Midflight, the Dynon Hobbs was 566.4 (2 hrs) and the tach time fluctuated between 489.1 and 490.3 (1.3 hrs and 2.5 hrs)
The tach time does not fluctuate at startup. The fluctuation is every second or so and starts at a delta of 0.1, and grows.
In this flight, right before shutdown, I ended with 567.6 Dynon Tach Time (3.2 hrs) and the tach time fluctuated between 490.0 and 492.1, representing 2.2 hours and 4.3 hours) - neither of which is correct. This was a X/C flight at a constant 2400 RPM (with the EMS set to a cruise RPM of 2400), so the Tach time should closely match the Hobbs.
The tachometer is steady and seems fine.
What could be causing this?
Thanks,
- Ben
