Sensor Calibration; Hardware Offset Calibration; Multilogpro Automatic Zero Calibration - Fourier MultiLogPRO User Manual

6.3 Sensor Calibration

In this chapter you will learn how to increase the MultiLogPRO system accuracy
using calibration. Most of the sensors are linear, i.e. the output level of each
sensor changes according to the equation:
Where:
Y - output of the sensor (voltage level changing from 0 to 5V).
X - sensor input.
a - sensor gain.
b - sensor offset.
The calibration process allows us to control the offset, and in some cases even
the gain, of a sensor. The MultiLogPRO system offers 4 types of calibration:
 Hardware offset calibration.
 MultiLogPRO automatic zero calibration
 WeatherLab Sensor calibration
 Factory calibration (no manual calibration required)

6.3.1 Hardware Offset Calibration

On some of the sensors there is a screw controlling the sensor offset. To
calibrate the sensor, rotate this screw until the sensor shows the correct
measured value (obtain the actual "correct value" from another source that is
known to be accurate).

6.3.2 MultiLogPRO Automatic Zero Calibration

MultiLogPRO is able to automatically calibrate the sensor offset for all analog
sensors accurately, quickly, and for every new experiment conducted.
The calibration method is very simple. Whenever you plug in a sensor, the data
logger checks to see if the selected sensor measures a value within 2% of its
"zero value". If so, MultiLogPRO sets that value as zero.
1. To enable this feature, make sure that the sensors are at their "zero
values" when you plug them in. To ensure the most accurate "zero
value": Shorten the Voltage sensor plugs.
82 MultiLogPRO
 
Y aX b