CTD-N Technical Manual
page 100
EAR-Controlled Technology Subject to Restrictions Contained on the Cover Page.
Calibrating the External Sensors
CTDPro allows you to calibrate optionally installed external sensors. You must provide the means to
set up the sensor to expose it to stimuli at its low and high range of operation and, if required,
points in between. If the external sensor to be calibrated is a Seapoint turbidity or fluorometer sen-
sor, select the desired range as described in
Selecting the Range for the Turbidity Sensor
or
ing the Range for the Fluorometer Sensor
before calibrating the sensor. Note that this step is not
required for fluorometers or turbidity sensors by other manufacturers.
NOTE.
You can also select the desired range by setting the Channel 1 (turbidity sensor)
Gain_0 and Gain_1 outputs, or the Channel 2 (fluorometer sensor) Gain_0 and Gain_1
outputs. For instructions on how to make these settings, refer to
and to
Displays or sets the Gain1_0 and Gain1_1 outputs
. The
settings must conform to a specified truth table as provided in the Seapoint Turbidity Meter
or Chlorophyll Fluorometer user manual.
To calibrate an external sensor:
1. Connect the CTD-N to your computer.
2. Choose Start
➤
All Programs
➤
RD Instruments
➤
CTDPro.
CTDPro starts and the CTDPro Main window opens.
3. Choose Sensors
➤
Calibrate.
The Calibrate Sensor dialog box shown in Figure 54 opens.
Figure 54.
The Calibrate Sensor Dialog Box—Selecting the Sensor
4. In the Calibrate Sensor dialog box, select the sensor from the Sensor drop-down list box.