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4 Analog Output Calibration
About This Section
This section provides information about how to calibrate a transmitter's analog output circuit.
All procedures in this manual assume the transmitter is configured for Loop Current
Mode enabled, see section 4.3.2.
Equipment Required
•
Digital Voltmeter or milli-meter with 0.02 % accuracy or better
•
250 ohm resistor with 0.01 % tolerance or better
Analog Output Signal Calibration Trim
With a transmitter in its constant current source mode, its analog output circuit can be trimmed at
its 0 (zero) % and 100 % levels. It is not necessary to remove the transmitter from service.
The user can calculate milliamperes of current from a voltage measurement as follows:
Dc milliamps = 1000 X voltage/resistance
IMPORTANT: Be sure that the accuracy of the resistor is 0.01% or better for current
measurements made by voltage drop
Revision 1
.
SLN700 Series HART
Option User's Manual
Page 25
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