4.4.2 Analog Output Calibration Procedure
Voltage Calibration
1. Navigate to the Communications→Analogue Output Menu.
2. Ensure that Output Type is set to Voltage.
3. Connect a volt meter (using an appropriate adaptor or probes on the volt meter) to the ground
(pin 24) and the relevant output pin (pin 10).
4. Adjust the 0.5V Calibration value until the volt meter reads 0.500 +/ .002.
5. Adjust the 5.0V Calibration value until the volt meter reads 5.00 +/ .002.
Current Calibration
1. Navigate to the Communications→Analogue Output Menu.
2. Ensure that Output Type is set to Current.
3. Connect a current meter (using an appropriate adaptor or probes on the current meter) to the
ground (pin 24) and the relevant output pin (pin 10).
4. Adjust the 4mA Calibration value until the volt meter reads 4mA +/ .01.
5. Adjust the 20mA Calibration value until the volt meter reads 4mA +/ .01.
4.4.3 Analog Inputs
The analyser is also equipped with three analog inputs with resolution of 15 bits plus polarity,
accepting a voltage between 0-5 V. These go directly to the microprocessor and should be protected
to ensure static/high voltage does not damage the main board (instrument warranty does not cover
damage from external inputs).
4.4.4 Digital Status Inputs
The analyser is equipped with 8 logic level inputs for the external control of the analyser such as
Zero/Span sequences. Each input has a terminating resistor which can be either PULL UP or PULL
DOWN. This is set using the Jumper JP1 on the back panel printed circuit board (refer to Figure 10).
4.4.5 Digital Status Outputs
The analyser is equipped with 8 open collector outputs which will convey instrument status condition
warning alarms such as no flow, sample mode, etc. Two of the digital outputs can be set so that
there is +5V or +12V available on the 25 pin connector for control purposes, instead of digital outputs
0 and 1.
In the default jumper locations (refer to Figure 10) these two outputs will function normally as open
collector outputs. If moved to the position closer to the 25 pin connector then DO 0 will supply +12V
and DO 1 will supply +5V. These supplies are limited to about 100mA.
To Next Page
Loading...
