7088-8000
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F.4.8 4-20 mA CURRENT LOOP OPTION GROUP
The
4-20 mA
option group is accessed by clicking on
4-20 mA
in the Options Column.
This group contains the options for calibrating and testing the current loop and setting the
current loop span. The present value of the current loop output is displayed in milliamperes
above the test/calibration slide bar.
NOTE:
Refer to the following sections for more information on the current loop:
!
Section 2.4.5 - connecting wiring to the current loop module
!
Section 2.6.1 - replacing the current loop module
!
Section 2.6.2 - selecting the current loop powering option
IMPORTANT:
The current loop and relay functions on the DCT1088 are mutually
exclusive. Only one of these functions can be enabled at a time. When
calibrating, testing, or operating the current loop on a DCT1088, the relay
function must be disabled. (The relay mode selection must be
OFF
.)
Calibrating and Testing the Current Loop
The 4 to 20 mA current loop can be calibrated. In addition, the calibration of the current
loop and/or the devices connected to it can be tested. The current loop is factory calibrated
and should not require field calibration prior to initial use. However, if calibration and
testing should become necessary, complete the following steps:
1. From the
4-20 mA
options group, click on the
4-20 mA
check box to enable the current
loop function.
2. Click on the
TEST/CALIBRATION
check box.
3. Click on the
CALIBRATE
command button.
The first Current Loop Calibration screen (Step 1 of 5) is displayed (Figure F-18):
Figure F-18 Current Loop Calibration Screen (Step 1 of 5)
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