Information

754
DOCUMENTING PROCESS CALIBRATOR
TEST DC PWR
++
– –
754
DOCUMENTING PROCESS CALIBRATOR
TEST DC PWR
++
– –
C-2
C-1
S-3
S-2
S-4
S-1
Simulating Thermocouples and RTDs for calibration and testing
TC transmitter calibration connection
©2015 Fluke Corporation. Specifications subject to change without notice. 07/2015 6005865a-en
RTD transmitter calibration connection
754
DOCUMENTING PROCESS CALIBRATOR
TEST DC PWR
++
– –
754
DOCUMENTING PROCESS CALIBRATOR
TEST DC PWR
++
– –
C-2
C-1
S-3
S-2
S-4
S-1
Simulating Thermocouples and RTDs for calibration and testing
TC transmitter calibration connection
©2015 Fluke Corporation. Specifications subject to change without notice. 07/2015 6005865a-en
RTD transmitter calibration connection
9
Additional resources
For more in depth information
about this application check out
these videos and application notes
from Fluke.
Testing, troubleshooting,
calibrating process temperature
devices webinar
Temperature calibration
application note
Hart Transmitter Calibration
Understanding specifications
for process calibrators
Multifunction calibration
using the 7526A Precision
Process Calibrator
• When simulating a ther-
mocouple signal from a
simulator, always use the
correct thermocouple wire
for the test, either the
exact same TC wire type
or a compatible extension
wire type.
• When simulating tempera-
ture with a calibrator with
active reference junction
compensation, remember
that the calibrator actively
compensates for tempera-
ture changes. Changes in
ambient temperature
should be compensated for
automatically.
• Smart transmitters with
multiple input sensors
likely deploy pulsed
excitation current when
measuring RTD resistance.
In this instance, select an
active calibrator with a fast
response time like the 754
that responds in 1 mS.
• If it is necessary to verify
the sensor and transmitter
electronics together, refer
to the application detailed
on page 5.
To perform the test:
To use a calibrator with integrated HART communication to
perform a calibration on a HART smart temperature transmitter:
Disconnect the process measurement sensor.
Connect the mini-connector from the test wires to the TC source connec-
tion of the calibrator if a TC transmitter; if an RTD, make connections to all
three RTD input connections (assuming a 3-wire RTD).
Connect the measurement tool to the tested devices mA output.
Verify the devices range or span. This can be done by performing a HART
query of the device by the calibrator.
Use the HART device configuration to configure the calibrator for the test
(this is automatic if using the Fluke 754).
Enter the test tolerance and select the test strategy (number of points to
test).
Use the calibrator to apply the input temperatures, measure mA values
and, if a documenting calibrator is used, calculate and record measure-
ment errors for the pre-adjustment As-Found test.
If the test passes within limits, you are done. Otherwise, adjust the trans-
mitter (HART input trim and mA output trim).
After adjustment repeat the test As-Left and verify that the measured mA
values are within expected limits.
STEP
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STEP
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STEP
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STEP
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STEP
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STEP
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STEP
7
STEP
9
STEP
5
TECH
TIPS
9