74X Series
Calibration Manual
30
4.
Communication to the HART transmitter has been established if step two has been
observed. The calibrator has passed the HART mode verification test.
5.
If the calibrator does not recognize the transmitter, the test has failed and the
calibrator requires repair. Contact your nearest authorized Fluke Service Center for
additional service.
6.
Disconnect and secure all test equipment.
7
8
9
4
5
6
1
2
3
0
.
V
MEAS
SOURCE
SETUP
mA
V
Hz
TC
RTD
CLEAR
( ZERO)
ENTER
TC
mA
mA
V
V
RTD
RTD
SOURCE
300V
MAX
30V
MAX
30V
MAX
30V
MAX
MEAS
CAT
DOCUMENTING PROCESS CALIBRATOR
744
S I G N A L
T E S T
+
–
Fluke 744
HART Transmiter
gb21c.eps
Figure 15. HART Mode Verification Connections
Calibration
Calibration is required only if the unit-under-test (UUT) fails verification. Always re-
verify after calibration.
All Documenting Process Calibrators referenced in this manual use the same calibration
procedure. Calibration is done using internal software. There are no physical adjustments
(except for three potentiometers used for common-mode error; explained later in this
chapter). The following instructions for calibration are minimal because of the built-in
guided procedures. The internal software routines produce displays that give step-by-step
prompts for the correct stimulus or measurement. The guided procedures also illustrate
which terminals (jacks) to use when applying a stimulus, taking a measurement, or which
terminals need to be shorted with jumpers. Follow the instructions exactly to complete
each calibration routine successfully.
Equipment Required for Calibration
The required accuracy of the source or measurement does not necessarily correspond to
the number of decimal places indicated on the UUT’s display. For example, in calibrating
Frequency Measure
, when the display requests a source value of 5.00000V at 1.00000
kHz, the required accuracies are not of that magnitude. Use the measurement and source
equipment suggested at the beginning of the Performance Verification Test.
Summary of Contents for 74X Series
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