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741B/743B
Users Manual
Calibrating a Process Instrument
When the calibrator is in simultaneous
MEASURE/SOURCE mode, a built-in calibration
routine is activated when you press the
softkey. (As Found data are the test results showing
the condition of a transmitter before it is calibrated.)
Additionally, the Model 743 runs tasks (procedures)
that are developed using a host computer and
compatible application software.
Caution
Calibration of pulsed or multiplexed RTD
instruments with settling times of less
than 100 ms may result in errors, and is
not recommended.
Generating "As Found" Test Data
The following example shows how to generate as
found data for a thermocouple temperature
transmitter. The way you set up the template for the
procedure is similar for Delta-P and 1 Pt. and 2 Pt.
Switch tests.
66
In this case the calibrator is simulating the output of a
thermocouple and measuring the resulting current
from the transmitter. Other transmitters use this
same method. Just go back to MEASUREMENT or
SOURCE mode and change the operating
As Found
parameters before you press
1. Connect the test leads to the instrument under
2. If necessary, press
3. Press
4. Press
5. Press
6. Use the
7. Enter a source value, for example 100 degrees,
test as shown in Figure 23. The connections
simulate a thermocouple and measure the
corresponding output current.
.
for SOURCE mode.
.
and
keys to select the
thermocouple type, then press
then
.
.
As Found
for MEASURE mode.
.
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