Application Note

5 Fluke Corporation Abridged HART Transmitter Calibration
Calibration of a
Rosemount 3051 HART
Pressure Transmitter
Basic connections
This example assumes that
the transmitter is isolated from
the process and is not electri-
cally connected to a loop power
supply. Make basic connections
to the 3051 per the diagram in
Figure 4. A separate 250 ohm
resistor is not necessary because
the 754 incorporates a resistor
in series with the loop supply
through its mA jacks. The 3051
in this example is configured for
mbar units.
Procedure
1. Power on the Fluke 754
Calibrator. Press the red
key followed by the Loop
Power softkey and the 754
will display the basic HART
information for the 3051
(Figure 5).
Figure 5.
Figure 4.
Figure 6.
2. Press the key again and
you are prompted to select
the 754 configuration (Figure
6). Selecting MEAS mA,
SOURCE mbar will configure
the calibrator to measure
the analog mA output and
the pressure being applied
simultaneously to the trans-
mitter input and the pressure
module. (Selecting MEAS PV,
SOURCE mbar will config-
ure the 754 to evaluate the
digital PV output from the
transmitter.) Press to
select.
3. Vent the pressure line and
press
CLEAR
(ZERO )
to zero the pres-
sure module. Press the As
Found softkey, and then
press to select Instru-
ment for a linear transmitter
calibration. (If the 3051 is
configured for square root
output, select Instru-
ment.) Notice that the
calibration template is auto-
matically completed with the
exception of Tolerance. Fill in
the appropriate test tolerance
and press Done.
4. Press the Manual Test
softkey to begin calibration.
Apply the input pressures
as instructed in the SOURCE
screen. Press the Accept
Point softkey when the cor-
rect pressure is applied for
each point. When the test is
complete, the error summary
table is displayed (Figure
7). Test errors exceeding
the tolerance are high-
lighted. When done viewing
the table, press the Done
softkey. Press Done again
to accept, or to change
the tag, serial number or ID
fields.
Example 1
Figure 7.