User Manual

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thisinterfaceyoucanviewmoreHARTProcessVariablesincludingprimaryvariable(PV),rang(%),PVcurrentvalue(AO),
loopcurrent(CA),thesecondaryvariable,thethirdvariable,andthefourthvariable,andtheirvaluesarecontinuously
updated. PV, %,AO, and CA are selectable; you canchoose a process
variableandreturntothe
CommunicationInterface(Figure11.4).
11.4HART Diagnostics and Service
WhenthemeasurementisactiveinHARTCommunicationInterface,
youcanpressServicetodisplaytheHARTdiagnosticandserviceinterface
(Figure 11.6). The calibrator provides Loop Test, PV (Primary Variable)
ZeroTrim,PVCalibration,OutputTrimandSpecialCalibrationoperations
to calibrate a transmitter.Note that Loop Test 
and Output Trim are not
availableifthetransmitterisinmulti‐dropmode.
11.4.1 Loop Test
TheLoopTestoperationwillsendacommandtothetransmitterto
set its analog output to the specified value. To perform a Loop Test
operation,proceedasfollows:
1. IntheHARTdiagnosticandservice
interface,chooseLoopTestfrom
list, and then you can press Enter or Select to show Loop Test
interface(Figure11.7);
2. Inthisinterface,youcanusenumerickeystoinputvalueofthetest
current. Its range is 4 to 20mA. Then pressEnter or Done to start

Figure11.6HARTDiagnostics&Service