4-11
Chapter 4 Maintenance and Troubleshooting of this Device
4-2-2 Output Signal Calibration
(1) Preparation
In normal circumstances, output signal calibration (D/A converter adjustment) is not necessary
and should not be done. If performing this operation cannot be avoided, have the following devices
on hand.
(2) Required Equipment
• Precision ammeter: 0.03% FS
• Precision resistor: 250 Ω ± 0.005%
• Communicator: CommStaff, HART communicator
(3) Wiring for Calibration
When wiring, refer to the following diagram. In order to check that connections are correct and
that the device and communicator are communicating, do the connection testing described in
Section 3-1-1.
Communication Cable
M-/CHK+
S-/CHK- S+
250 Ω
Red Wire
Black Wire
Precision
Ammeter
+
−
DC Power
Supply
24V
Figure 4-4. Wiring
(4) Output Signal Calibration Procedure
See the operation manuals for the respective communicators.
CommStaff Instruction Manual (HART5) Section 4-1 / (HART7) Section 3-1
HART Communicator Operation Manual (HART5) Section 3-2-8 / (HART7) Section 3-3-2
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