VTI Instruments Corp.
94
EX10xxA Web Page Operation
Example #2
This example demonstrates a typical setup sequence for a transient monitoring application with an
alarm. The requirements of the application are:
Input connections are 48 type E thermocouples connected to channels 0 through 47.
The temperatures to be monitored are transient in nature, such that the 1 kHz filter frequency
is suitable.
Measurement data is required to be in units of ºC.
Timestamp reporting is desired, but CJC temperature reporting is not.
Data is to be acquired at a rate of 1000 readings/second for 10 seconds, triggered by a positive
edge transition on channel 0 of the trigger bus.
Once the 10 seconds of data is collected, the test is complete.
DIO Channel 7 is to be used as an alarm indication, in which it needs to transition low if any
of the 48 channels exceeds 50 ºC.
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
Enabled
link to
enable all 48 channels. Since all channels require the same EU conversion, click the
E
link. Click
the
Apply
button to accept the changes.
Configure the Filter Frequencies
The filters are configured with the
Scan List…Filters
page. Since all channels require the same
filter setting, click the
1 kHz
link. 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
C
. Uncheck the
Report CJC Temperatures
checkbox. Check the
Report Timestamps
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 VTI Trig. Bus branch and select
Pos. Edge
of VTB Channel 0. Within the Trig source, select
Timer
. Set a
TRIG Count
of
10000
. Enter a
Timer Interval
of
0.001
. Uncheck 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 0-47, check the
Manual
checkbox and enter an upper limit value of 50.
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
channel
7
. Since all channels are required in the limit evaluation, click the
Set 0 Upper
All
link.
Check the
Invert
checkbox. Uncheck 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.
Содержание EX1000A
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