Output Calibration - Honeywell MC ToolKit User Manual

Output Calibration

The Loop Test procedure is intended as a check for continuity and condition of components in the output
current loop. The procedure for Honeywell HART devices is given in Table 15, and for non-Honeywell
devices consult the manufacturer's User Manual.
The D/A Trim procedure calibrates the output of the Digital to Analog converter for minimum (0%) and
maximum (100%) values of 4 mA and 20 mA, respectively. This procedure is used for transmitters
operating on-line in analog mode, to ensure proper operation of the transmitter with all associated circuit
components (wiring, power supply, control equipment, etc). It is necessary to use precision test equipment
(a voltmeter and in-circuit resistor or an ammeter).
The procedure for Honeywell HART devices is given in Table 16, and for non-Honeywell devices consult
the manufacturer's User Manual.
The Apply Values procedure uses actual Process Variable input levels for calibrating the range of a
transmitter. To measure a liquid level for example, a sight-glass can be used to determine the minimum
(0%) and maximum (100%) level in a vessel. The PV is carefully adjusted to stable minimum and
maximum levels, and the LRV and URV values are then set by commands from the MC Toolkit.
For Honeywell HART devices, the procedure is given in Table 17, and for non-Honeywell devices consult
the manufacturer's User Manual.
Release 3
9/06
MC Toolkit Software with Honeywell HART Transmitters
34-ST-25-20 MC Toolkit User Manual 41