Mace HydroMace XCi, Product Manual

Page: 217 / 270

"2-Point Calibration" function
To correctly calibrate an environmental sensor it is important to calibrate it over its useful range. For example,
if a depth sensor has a range of 0 - 2 metres but you only wish to use it to measure the range 0.0 metres to
1.25 metres, you should re-calibrate it across the reduced range.
1. Click “ 2-point calibration
” from the “
Edit channel
” dialogue box and the “
2 point calibration
”
dialogue box appears.
The “
Current value
” from the sensor (in this case a depth sensor with frequency output) is displayed
at the top of the window and is updated approximately once per second.
2. To carry out a two point calibration, prepare the measurement set up for the first calibration point
(either the sensors upper or lower range limit).
3. When the “ Current value
” has stabilised, click on the “
Set
” button in the “
1st point
” box. The
“
Current value
” is copied to the “
Measured value
” field of the “
1st point
” box and the “
Actual
value
” field is enabled.
4. Enter the sensors actual value (in this case depth) in the “ Actual value ” field.
5. Prepare the measurement set up for the second calibration point (the opposite sensor range limit from
that used in point 2 above). For example, if you used the upper range limit in point 2, now use the
lower range limit.
6. When the “ Current value ” has stabilised, click on the “ Set ” button in the “ 2nd point ” box. The
“ Current value ” is copied to the “ Measured value ” field of the “ 2nd point ” box and the “ Actual
value ” field is enabled.
MACE XCi User Manual - 217 -