Wndsn Quadrant Telemeter Tutorials
Making the most out of our graphical telemetry computers.
Like with many complex instruments, there are multiple ways to solve certain problems and to measure the required inputs. Combining the various functions leads to a multitude of advanced uses. See also the printed manual.
Powers of 10 and Scale Jumps
For measurements that are off the scales or to make use of the finer ranges of the logarithmic center scale, it is sometimes necessary to shift decimal points or 'jump' the scales for more precise measurements.
Rules of thumb
- Jump the scales in such a way that the string crosses the center scale as perpendicular as possible, at a range where the resolution is highest.
- Moving up on either the degree scale or the dimension scale means we have to multiply the result by that factor, or combination of factors.
- Moving down on either the degree scale or the dimension scale means we have to divide the result by that factor or combination of factors.
Sample inputs
- 0.3° measured angular size
- 12 m known object size
If the input is off the scale: shift power of 10
12 m isn’t part of the scale, so we have to use 1.2 m (12/10) to read the result:
- Connect 0.3° and 1.2 m (12/10) to get 200-250 m on the center scale.
- Hence, we have to add one zero to the result
- = 2000-2500 m
If the input is too low or high on a scale: shift power of 10
0.3° is too low to read since the string is almost parallel to the scale, so we use 3° (0.3×10):
- Connect 3° (0.3×10) and 1.2 m (12/10) to get 23 m on the center scale.
- Hence, we have to add two zeros to the result
- = 2300 m
If powers of 10 are impractical: divide or multiply by an arbitrary factor to jump scales
Should the input numbers be impractical to shift by powers of 10, it’s possible to multiply or divide a scale value by an arbitrary factor that shifts the values on that scale.
We take the 1.2 and multiply it by 2 to move down and further to the center of the scale:
- Connect 3° (0.3×10) and 2.4 m (12/10×2) to get 46 m on the center scale.
- Hence, we have to add two zeros to the result and divide by 2
- = 2300 m
If powers of 10 are impractical: divide or multiply by an equal factor on both sides
Should the input numbers be impractical to shift by powers of 10, it’s possible to multiply or divide the values by equal factors on both scales.
Now we also take the 3 and multiply it by 2 to move up and further to the center of the scale:
- Connect 6° (0.3×10×2) and 2.4 m (12/10×2) to get 23 m on the center scale.
- Equal factors on both sides can be ignored but we still add two zeros to the result
- = 2300 m