Accuracy facts about the CHRONO-G and inertial sensors:

1.) A slow 19 second E.T. machine has an acceleration signal less than half that of a 13 second machine. Slow vehicles are much more difficult for an inertial device to accurately measure since the weak acceleration signal is more easily masked by noise and sensor drift errors which are compounded by double integration over a longer E.T. time.

2) The original CHRONO-G is the only inertial measurement device to dare and succeed in accurately matching an IHRA sanctioned 1/4 mile dragstrip timing clock to within .02 seconds at all distances, for 5 sequential runs, on a very slow 19+ second E.T. vehicle - the "most difficult case" to measure accurately.

This unprecedented achievement and the tabular matchup results against the IHRA dragstrip are viewable at - Norwalk Dragway Match Test.

3.) Expect no other manufacture to attempt this on a similarly slow vehicle and their results to be 6 to 20 times less accurate at certain distances.

WHY?

Two shortened technical explanations:

A.) Generally, measurement devices using G-force starts and not precision rollout will initially be .2 to .4 seconds slow at the start. If they are also lacking precision tilt compensation algorithms, they will be measuring much more acceleration, in error, than is actually occurring. Too slow at the start, too fast at the end, intermediate times as well as the ending 1/4 mile E.T. are totally unpredictable.

An example of a device that does not have rollout or tilt compensation is the G-Tech Pro.

B.) To compete with the original CHRONO-G, a device must possess a highly linear sensor operating at design resolutions of better than 1330+ counts per G, augmented with precision zeroing algorithm, mechanical zeroing alignment adjustment, roll-out, proprietary non-linear tilt compensation algorithm, automatic calibration, high speed 200 sample/second calculation rates, and above all be provable against the dragstrip. For performance meters not designed to these standards, the user has no way of proving whether erratic results are due to the vehicle or the measurement device itself.

An example of a lower resolution device of 256 counts/G and no mechanical zeroing alignment is the AC-AP22.

4.) See Measurements Table for accuracy statements on the CHRONO-G.