Galvanic Applied Sciences 943-TGX-CE, Operation Manual

Page: 145 / 151

Revision 4 145 April 2020
10. If there are any issues with the calibration discovered while performing the test
procedure in Step 9, repeat the calibration process in steps 4-8 and test again.
11. Repeat the calibration process steps 1-10 for each additional analog output that needs
to be calibrated.
12. When all analog outputs have been calibrated and tested, press
Permanent Save to
save all changes permanently to the analyzer. This process will take approximately 30
seconds to complete.
Below the calibration and test fields for each analog are three read-only fields giving information
about the analog output. The
Description field shows the analog output number (AO1
– AO4),
the Unit field shows the output measurement units (milliamps for all analog outputs), and the
Calculated Value field shows the current output current, in milliamps, being output from that
analog output. The intensity of the green indicator LED on the IO board for each analog output
is directly proportional to the magnitude of the output current. That is to say, the LED will be
brighter when outputting 20 mA than when outputting 4 mA.
12.3.2 Testing the Digital Input
The IO board has a single digital input at terminal block P5 that is used for remote initiation
of a zero calibration cycle. This digital input can be tested using the procedure below.
1. Ensure that Direct Board Control Enable is selected on the Manual Override page.
2. Switch to the Status page.
3. Connect a switch with a 12-24VDC power supply to the digital input terminal block to
create an open circuit connected to the digital input terminal block.
‘
The digital input terminal is polarity insensitive.
4. When the switch is open and the circuit is not complete, the Digital Input indicator on
the Status page will be grey (inactive).
5. When the switch is closed and the circuit is complete so that 12-24VDC is being
received at P5, the Digital Input indicator on the Status page will be red (active).
12.3.3 Testing Digital Outputs
There are four digital (relay) outputs available at P4 of the IO board, as shown in Figure 91.