Large Display Temperature Meters
Instruction Manual
47
RECALIBRATION (
C
ALIB
)
The Digital Temperature Meter is precalibrated for six types of thermocouples
and two types of 100
Ω
RTD sensors. These input ranges may be recalibrated
and should be checked every 12 months.
Calibration is performed from the front panel using the
ENTER
button. The
lockout jumper JP2 must be removed to gain access to the calibration menu, see
Input Selection and Lockout Jumpers (Main PCB)
, on page 19. The only
equipment needed is a thermocouple calibrator or a 5 decade resistance box with
an accuracy of about 0.1% and a minimum resistance step of 0.01
Ω
for RTD
calibration.
Before attempting to calibrate the meter, make sure type selected and input
signal wires are correct. Using the wrong type selection or the wrong T/C wire will
cause inaccurate temperature readings.
Note
To simplify programming, write down the desired programming values
prior to attempting to program the meter. The
Programmed
Parameter Settings
form, located on page 69, provides a convenient
method to record the user settings; it also provides the factory setting
for most of the programmable parameters.
Press
ENTER,
then press it again when calibrate
(
CalIb
) function appears.
CalIb
Input 1 (
Inpt 1
) will flash. Apply the input corresponding to the low
calibration point. Here, in this example calibration points will be
32
°
F and 1000
°
F. It is recommended to set the calibration points
outside the minimum and maximum expected temperature readings.
Press
ENTER
.
Inpt 1
Set the low calibration
For instructions, see
Five Basic Digit/Display-Setting
Instructions
on page 31. After
low calibration point has been programmed, the display will flash
Inpt 2
.
00000f
final
00032f
Input 2 (
Inpt 2
) will flash. Apply the input corresponding to the high
calibration point. Press
ENTER
.
Inpt 2
Set the high calibration point
The procedure used to set the low calibration point is the same for
the high calibration point. In this example we will set it for 1000
°
F.
After high calibration point has been programmed, display moves to
the next menu function.
1000f
Calibration Error (
error
)
A meter display of
Error
during calibration indicates that the calibration process was not
successful. The meter should be recalibrated.
The
Error
message will appear if input 1 signal and input 2 signal are too close together.
The
Error
message will appear if input 1 signal is inadvertently applied for input 2
calibration signal, or
ENTER
is pressed before applying input 2.
In all cases, if an error message appears, previous calibration points will be retained in
memory.