25
Calibration Procedure
(Two Probes Detected)
This calibration function provides for both an offset
and slope field calibration of either or both T1 and
T2. For proper calibration the following conditions
must be observed:
• The slope point must be a higher temperature than
the offset point.
• The difference must be at least 20°C.
• Use two points based on the expected high and
low temperatures. Temperatures measured out-
side of these limits may no longer meet accuracy
specifications.
Proceed as follows to calibrate the probes.
1. Place the probe at the lower known reference
temperature.
2. Offset Calibration: Momentarily press the CAL
key to enter the calibration mode, the CAL an-
nunciator will flash. The temperature is displayed
on the main display and Lo is displayed on the
lower left display. “Lo” signifies that this is the
offset point.
3. Allow the reading to stabilize. If the displayed
temperature is higher or lower than the reference
temperature, use the MAX
▲
▲
▲
▲
▲
key to increase
the displayed reading or the MIN
▼
▼
▼
▼
▼
key to de-
crease the displayed reading until the reference
temperature is displayed. The MIN
▼
▼
▼
▼
▼
or MAX
▲
▲
▲
▲
▲
key must be pressed at least once. The CAL
annunciator should be blinking during this
procedure.
4. Press the HOLD
key to lock the T1 calibra-
tion in and advance to T2 offset calibration, or
press the CAL key to skip T1 calibration. In either
case you will now be in T2 offset calibration.
