Dac Trim (4Ma And 20Ma); Loop Test - K-TEK MT5000 Installation & Operation Manua

4.5.6. DAC TRIM
The MT5000 is designed as a 2 wire loop powered device. It will generate a mA OUTPUT
over a range of 3.61 to 21.00 mA. When an MT5000 is calibrated at the factory, the output
of the unit will be set to correspond to a calibrated multi-meter. The exact output is set us-
ing the DAC TRIM function. When an MT5000 is installed and wired, the field wiring and
other loop components may affect the mA OUTPUT that is received at the point of control.
The DAC TRIM will be used to compensate for the loop components and allow the point of
control to receive a true 4 and 20 mA.
To adjust either the 4 or 20 mA DAC TRIM:
1. A means of measuring the current output must be established in the control loop.
2. Scroll to the desired function.
3. Press and hold the SELECT button for 2 seconds. (the output will change to what the
transmitter interprets as 4 or 20 mA.)
4. Using the SELECT, UP and DOWN buttons to enter the measured current value.
5. Press the SELECT button to set each digit and move to the next digit in sequence.
6. After the last digit is set, the mA OUTPUT will adjust to exactly 4 or 20 mA.
7. Scroll DOWN to END MENU.
8. Pressing the SELECT button now will return you to the main screen.

4.5.7. LOOP TEST

LOOP TEST is a function designed to simulate transmitter output at various levels and
confirm readings from a separate location. The LOOP TEST may be performed at any mA
OUTPUT between 3.61 and 21.00.
To perform a LOOP TEST:
1. Press and hold the SELECT button for 2 seconds.
2. Scroll UP or DOWN to select each digit for the desired mA OUTPUT.
3. Press the SELECT button to set the digit and move to the next digit in sequence.
4. After the last digit is set the mA OUTPUT will change to the desired level. (Another
mA OUTPUT may be selected by repeating steps 1 through 4.)
5. Scroll DOWN to END MENU. (The mA OUTPUT will return to normal operation after
pushing the DOWN arrow)
6. Pressing the SELECT button now will return you to the main screen.
MT5000-0200-1 Rev f (10-2010) DCN0528
4mA DAC TRIM
mA
LVL: XX.XX in XX.XX
20mA DAC TRIM
mA
LVL: XXXX.XX " XX.XX
LOOP TEST
mA
LVL: XXXX.XX " XX.XX
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