Meriam M4 Series Precision Calibrator Data Logger Manual - Manual (Page 37)

ZM4 Instruction Manual 9R87-B June 2012
37
Applications
The M4 is designed to power up a transmitter to calibrate the pressure
channel and channel and mA output. The unit under test should be isolated
from the process and taken out of the loop before starting the calibration.
Please make sure you have the proper sensor and range before starting the
calibration. The Full Scale range of the sensor is displayed next to the sensor
location in the current engineering units.
To calibrate the transmitter under test, insert test leads into the bottom of the
M4. Observe loop polarity using the color coded standard banana jacks (Red
+) and (Black -). If the loop requires power, the M4 will source 24V and
measure the mA in the loop. The 24V source mode is located under the VMA
setup menu. Field devices with compliance voltage about 19V may not be
able to be calibrated. See the load line curve under specifications.