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Calibrating a process instrument, Generating fias foundfl test data, Generating “as found” test data – Martel Electronics MasterCAL User Manual

Page 81

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Calibrator

Calibrating a Process Instrument

71

Calibrating a Process Instrument

Note

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

As Found

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.

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

As Found

.

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

M

for MEASURE mode.

3.

Press

m

.

4.

Press

M

for SOURCE mode.

5.

Press

t

.

6.

Use the

u

and

d

keys to select the

thermocouple type, then press

e

.

7.

Enter a source value, for example 100 degrees,
then

e

.