The manual for the Wisdom 2 computer says this on page 30:
Calculations within the Wisdom change based upon the Pressure Sensor's measurement of Barometric Pressure. Changes are made when a Pressure is sensed that is equivalent to 1 foot above or below each increment of 1,000 feet. Due to the +/- 1 foot (+/- 1,000 feet altitude) Tolerance of the Sensor, it is possible at any Altitude for the Wisdom to 'display' a LEVEL and perform calculations based upon a measured Pressure value that differs from the true vertical altitude.
What, exactly, does that mean?
I understand the part about other variables possibly affecting the calculation at a particular altitude because the instrument is sensing PRESSURE, not really measuring vertical altitude.
But I don't understand the relationship between the 1 foot and 1,000 feet. What does that mean?
What I really want to know is this: What is the level of accuracy that the instrument measures altitude? Is it one foot, or is it 1,000 feet?
The LEVELS that it displays are in 2,000 foot increments, but in the Altitude NDL chart on page 108, the increments are 1,000 feet.
I'm fine if it rounds to the closest 1,000 feet, but what is this +/- 1 foot statement all about? Is the barometric pressure sensitivity really so good that it can sense the equivalent of a 1 foot change in altitude, but that it doesn't change a computation or LEVEL display until it crosses a 1,000 foot line?
Calculations within the Wisdom change based upon the Pressure Sensor's measurement of Barometric Pressure. Changes are made when a Pressure is sensed that is equivalent to 1 foot above or below each increment of 1,000 feet. Due to the +/- 1 foot (+/- 1,000 feet altitude) Tolerance of the Sensor, it is possible at any Altitude for the Wisdom to 'display' a LEVEL and perform calculations based upon a measured Pressure value that differs from the true vertical altitude.
What, exactly, does that mean?
I understand the part about other variables possibly affecting the calculation at a particular altitude because the instrument is sensing PRESSURE, not really measuring vertical altitude.
But I don't understand the relationship between the 1 foot and 1,000 feet. What does that mean?
What I really want to know is this: What is the level of accuracy that the instrument measures altitude? Is it one foot, or is it 1,000 feet?
The LEVELS that it displays are in 2,000 foot increments, but in the Altitude NDL chart on page 108, the increments are 1,000 feet.
I'm fine if it rounds to the closest 1,000 feet, but what is this +/- 1 foot statement all about? Is the barometric pressure sensitivity really so good that it can sense the equivalent of a 1 foot change in altitude, but that it doesn't change a computation or LEVEL display until it crosses a 1,000 foot line?