CALIBRATION (
(ALIb
)
The PD750 is pre-calibrated for 6 types of thermocouples and 2 types of 100 Ω RTD
sensors. The PD751 is pre-calibrated for 10 Ω copper RTD sensors and the PD752
is pre-calibrated for 120 Ω nickel RTD sensors.
These input ranges may be re-calibrated and should be checked every 12 months.
Calibration is performed from the front panel using the
ENTER
button. It does not
require any tools or disassembly of the meter. The only equipment needed is a ther-
mocouple calibrator or a 5 decade resistance box with an accuracy of about 0.1%
and a minimum resistance of 0.01 Ω for RTDs.
Go to
INPUT TYPE
on page 11 if calibration is not necessary.
Input 1 Calibration
1. Press
ENTER
, when
[ALIb
appears press
ENTER
again.
2. Meter flashes
iNPT1
. Apply input 1 (low signal) using a calibrator, THEN press
ENTER
.
3. All digits flash for 3 seconds.
If this is the desired display for input 1, press
ENTER
before
entire display stops flashing, (meter will then flash InPt 2). Go
to step 9 below.
If this is not the desired display, (or if
ENTER
was not pressed
in time to accept the display) wait for the first digit to flash.
First digit flashes for 3 seconds before it scrolls.
4. When digit is OK, press
ENTER
, next digit will flash for 3 seconds before it scrolls.
5. When flashing digit is OK, press
ENTER
, next digit will flash for 3 seconds before
it scrolls.
6. Repeat step 4 for each remaining digits.
7. When last digit is OK, press
ENTER
.
8. Entire display will flash for 3 seconds. Press
ENTER
within the 3 seconds if OK to
complete input 1 calibration. If not OK, wait for first digit to flash and go to step 3
above.
9. Meter flashes
iNPT 2
. Apply input 2 (high signal) using a calibrator, THEN press
ENTER
.
10. GO TO STEP 3 ABOVE.
C
Caalliibbrraattiioonn EErrrroorr
An
Error
message during calibration indicates that the calibration process was not
successful. The meter should be recalibrated.
An
Error
message will appear if input 1 and input 2 signals are within 4 millivolts.
An
Error
message will appear if input 1 signal is inadvertently also applied for
input 2 calibration, or
ENTER
is pressed before applying input 2.
10
Model PD750, PD751, PD752 Universal Temperature Meters
Instruction Manual
