Analog Output Calibration; About This Section; Equipment Required; Analog Output Signal Calibration Trim - Honeywell SLG 700 User Manual

4 Analog Output Calibration

4.1 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.

4.2 Equipment Required


Digital Voltmeter or milli-meter with 0.02% accuracy or better

250 ohm resistor with 0.01% tolerance or better

4.3 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
4.3.1

Procedure with handheld communicator

1. Connect the MC Toolkit across loop wiring, and turn it on. See Figure 2 page 4 for a
sample test equipment hookup.
2. Launch the FDC application.
3. On the Home page, select Online and establish a connection with the device as
follows;
4. Select the My Device menu, and choose from the following menus:
a. Online>Device setup>Advanced Configuration>Services>D/A Trim
b. My Device> Device setup>Advanced Configuration>Services>D/A Trim
5. The user will be prompted to remove the loop from automatic control; after removing
the loop from automatic control, press OK.
6. When a prompt appears connect reference meter in the loop to check readings, and
press OK. The following prompts will be displayed:
a. Setting fld dev to output to 4mA. Press OK
b. Enter meter value. Key in the meter value, and press ENTER.
Fld dev output 4.000 mA equal to reference meter?
c.
1 Yes
2 No
Revision 5
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SLG 700 Series HART Option User's Manual
Page 49