Ocean Optics Jaz Install - Manual (Page 50)

5: Operating the JAZ-INDY Module
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 Four single-ended voltage inputs and the two differential inputs
 4-20mA transmitter
 4-20mA receiver
Calibrating the Voltage Outputs
The JAZ-INDY module provides four analog voltage outputs on its 26-pin connector (outputs 14 are
mapped to pins 5, 14, 23, and 4 respectively, where pins 2, 12, or 15 can be used as analog ground).
► Procedure
1. Connect an external, calibrated voltmeter (providing at least 5 total digits resolution) to each
output pin to calibrate it. No load should be connected to the output pin; it should be connected
to a voltmeter and nothing else.
2. Set the output voltage (in counts) until the voltmeter reads as close as possible to -4.5V. Record
this value to be used later.
3. Set the output voltage (in counts) until the voltmeter reads as close as possible to 0.0V. Record
this value to be used later.
4. Set the output voltage (in counts) until the voltmeter reads as close as possible to 4.5V. Record
this value to be used later.
5. 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.
6. Operating JAZ-INDY from SpectraSuite), select the voltage output to be calibrated: