Calibrating A Process Instrument; Generating "As Found" Test Data - Fluke 744 User Manual

744
Users Manual

Calibrating a Process Instrument

To calibrate a HART-capable transmitter
using the built-in HART interface, you use a
different procedure than the one that follows.
See the HART Mode Users Guide for
instructions.
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.)
The calibrator runs preloaded tasks (procedures) that
are developed using a host computer and compatible
application software.

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.
68
Note
As Found
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
parameters before you press
1. Connect the test leads to the instrument under
test as shown in Figure 23. The connections
simulate a thermocouple and measure the
corresponding output current.
2. If necessary, press
3. Press .
4. Press for SOURCE mode.
5. Press .
6. Use the and keys to select the
thermocouple type, then press
7. Enter a source value, for example 100 degrees,
then .
.
As Found
for MEASURE mode.
.