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4. Connect an ammeter to the input (IN) and output (OUT) terminals of the current loop
module and turn on the ammeter.
5. Click on the
NEXT>
command button.
The next Current Loop Calibration screen (Step 2 of 5) is displayed.
6. To perform a coarse calibration of the 4 mA (minimum) set point, enter the exact value
of the current loop output that is presently displayed on the ammeter.
7. Click on the
NEXT>
command button.
The next Current Loop Calibration screen (Step 3 of 5) is displayed.
8. To perform a coarse calibration of the 20 mA (full scale) set point, enter the exact value
of the current loop output that is presently displayed on the ammeter.
9. Click on the
NEXT>
command button.
TimeGATE
™
now performs a coarse calibration of the 4 mA and 20 mA set points. The
following Current Loop Calibration screen (Step 4 of 5) is displayed to allow a fine
calibration (Figure F-19):
Figure F-19 Current Loop Calibration Screen (Step 4 of 5)
10. Click on the
4 mA
radio button:
After the current loop output stabilizes, the ammeter should now read exactly 4.00 mA.
If not, the 4 mA set point should be finely adjusted.
11. If fine adjustment is not required, skip this step. If fine adjustment is required, click on
the up arrow button to increase the value of the output or the down arrow button to
decrease the value. (Every two clicks on a button adjusts the calibration by
approximately .01 mA.)
12. Adjust the calibration of the 20 mA set point in a manner similar to adjusting the 4 mA
set point (steps 10 through 11).
13. Click on the
NEXT>
command button.
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