Page 64 ST 700 Series HART/DE Option User’s Manual Revision 4.0
1. Start the MC Toolkit application such that the DE MAIN MENU is displayed.
2. Click the Calibration button to display the CALIBRATION menu.
3. Click Trim DAC Curr. To display the TRIM DAC CURRENT box.
4. The following outlines how to trim the output current:
a. Click Set Output To 0% or 100%. You will be prompted to confirm that you want to
place the Transmitter in output mode.
b. Verify that the loop is in manual control. In output mode, output current is fixed at the
0% or 100% level as selected in the TRIM DAC CURRENT box in the previous step.
c. Click Yes, and observe the loop current level. A meter reading of 4mA corresponds to
1 volt.
d. Use the Toolkit to adjust the loop current to the Zero Percent level (4mA). If the
current is low, tap the Increment button; if the current is high, tap the Decrement
button. Note that the value on the meter changes accordingly. If the error is large,
accelerate the adjustment rate by changing the Step Size to 10 or 100.
e. After establishing the zero current level (4mA), click Set Output To 100%. A meter
reading of 20mA corresponds to 5 volts.
f. Use the Increment or Decrement button, as necessary to adjust the output current to
20mA. When the current reaches the 20mA level, click Clear Output; the button will
change to half-intensity.
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