Fourier Systems Ltd.
16 Hamelacha St., POB 11681, Rosh Ha
‘
ayin 48091,
Tel: +972-3-901-4849, Fax: +972-3-901-4999
www.FourierEdu.com
EXPERIENCE
SCIENCE!
Sensor Calibration
In this section 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 four types of calibration:
Hardware offset calibration
MultiLogPRO automatic zero calibration
MultiLab
Sensor calibration
Factory calibration (no manual calibration required)
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).
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.
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, follow these instructions for
the following sensors:
Shorten the Voltage sensor plugs
Leave the Current sensor plugs open
Cover the Light, Photo Gate, and Microphone sensors
b
aX
Y
