Configuration Examples; Example #1 - VTI Instruments EX1000A User Manual

C E
ONFIGURATION XAMPLES

Example #1

This example demonstrates a typical setup sequence for a static monitoring application with an
alarm. The requirements of the application are:

Input connections are five type J thermocouples connected to channels 0-4 and five type K
thermocouples connected to channels 5-9.

The temperatures to be monitored are slow-moving, such that the 4 Hz filter frequency is
suitable.

Measurement data is required to be in units of ºF.

CJC temperature reporting is desired.

Data is to be acquired at a rate of 20 readings/second whenever DIO Channel 0 is high.

Once initiated, the test should continue until aborted.

DIO Channel 1 is to be used as an alarm indication, in which it needs to transition high and
stay high if any of the 10 input channels exceeds 100 ºF.
The exact steps to be performed to satisfy this application are:
Configure the Scan List
The scan list is configured with the Scan List...Configuration page. Click the Disabled link to
clear all previously enabled channels and then check the checkboxes of channels 0 through 9. With
the appropriate radio button, set the EU conversion of channels 0 through 4 to J and channels 5
through 9 to K. Click the Apply button to accept the changes.
Configure the Filter Frequencies
The filters are configured with the Scan List...Filters page. Click the 4 Hz radio button for channels
0 through 9. Alternatively, since all enabled channels require the same filter setting, the 4 Hz link
can be used to simultaneously set all channels. Click the Apply button to accept the changes.
Configure the FIFO
The FIFO is configured with the Data...FIFO Configuration page. Select the Temperature Units
selection of F. Check the Report CJC Temperatures checkbox. Click the Apply button to accept
the changes.
Configure the Trigger Model
The trigger model is configured with the Trigger...Configuration page. Click the Default button.
Expand the Arm branch to expose the Arm source. Deselect any currently checked sources. Expand
the Digital IO branch and select Pos. Level of DIO Channel 0. Within the Trig source, select Timer.
Enter a Timer Interval of 0.05. Check the Init Continuous checkbox. Click the Apply button to
accept the changes.
Configure the Limit System
Limit conditions are configured with the Limits...Limits page. Using the Set pull-down selection,
select Set: 0. For channels 0-9, check the Manual checkbox and enter an upper limit value of 100.
Click the Apply button to accept the changes. These limit conditions are linked to the DIO channel
through the Limits...DIO Limit Events page. Using the DIO Channel pull-down selection, select
DIO Channel: 1. Check the Set 0 Upper checkboxes for Input Channels 0-9. Check the Latch
checkbox. Click the Apply button to accept the changes.
Initiate the Trigger Model
The acquisition sequence is initiated with the Trigger...Initialize page.
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