Ocean Optics Jaz Install - Manual (Page 51)

5: Operating the JAZ-INDY Module
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a. Select Minimum, then change the voltage to -4.5 and set the counts to the value you
measured in Step 2.
b. Select Zero and enter the counts measured in Step 3.
c. Select Maximum, then change the voltage to 4.5 and set the counts to the value you measured
in Step 4.
7. Repeat this procedure for each of the output channels.
Calibrating the Voltage Inputs
Once the voltage outputs are calibrated, they can be used to calibrate the voltage inputs. These can be
found on pins 3, 13, 22, and 21. Note that the output voltage may sag slightly when connected to the
voltage inputs, so it is necessary to keep the voltmeter connected to the joined input and output pins to
compensate.
► Procedure
1. Set the output voltage (in counts) until the voltmeter reads as close as possible to -4.5V.
2. Using the Jaz menu or SpectraSuite software (see Calibrating the 4-20mA Transmitter
The JAZ-INDY module provides a 4-20mA current controller that must be calibrated. There are only two
setpoints for this controller: 4mA and 20mA. The controller can be calibrated by passing the current
directly through a digital multimeter (ensure first that the meter is rated to withstand at least 30mA to
prevent damage). JAZ-INDY provides an excitation source that can be used to power the current
transmitter (pin 19). If you use this internal source, set it to 20V (this can be done in SpectraSuite) and
ground the output of the current loop (after passing through the multimeter) back to the JAZ-INDY
module (using any of the ground pins).
Calibrating the 4-20mA Receiver
Once the 4-20mA transmitter has been calibrated, it can be used to calibrate the receiver.
► Procedure
1. Move the ground connection from the current loop used in calibrating the 4-20mA transmitter so
that it is instead connected to pin 11 (4-20 Sense).
2. Vary the current output of the 4-20mA transmitter until 4mA is reached.
3. In the Jaz menu, select Calibrate | 4-20 mA Rx | Minimum. Set the mA value, if needed, to 4.0
and then select Sample 4.0mA.
4. Select Calibrate | 4-20 mA Rx | Maximum, then repeat this process for the 20mA setpoint.
Operating JAZ-INDY from SpectraSuite), select the voltage input to be calibrated:
a. Select Minimum, and change the voltage to -4.5V. Then select Sample at -4.50V. This will
update the counts automatically.
b. Set the output voltage (in counts) until the voltmeter reads 0.0V. Then select Calibrate |
Voltage In | #Zero | #Sample at 0.00V from the Jaz menu.