Extech Instruments IR270 User Manual page 6

Minimum Reading (MIN)
Use the M button to step to the MIN parameter, then pull and hold the trigger to start scanning
surface temperatures. The reading on the lower right represents the lowest reading recorded
during the current measurement scan. When pressing M from a powered OFF condition, the
value shown on the lower right is the lowest reading recorded during the last measurement scan
performed.
Differential Reading (DIF = MAX minus MIN)
Use the M button to step to the DIF parameter, then pull and hold the trigger to start scanning
surface temperatures. The reading on the lower right represents the difference between the
MAX and the MIN readings recorded during the current measurement scan. When pressing M
from a powered OFF condition, the value shown on the lower right represents the difference
between the MAX and the MIN readings recorded during the last measurement scan performed.
Average Reading (AVG)
Use the M button to step to the AVG parameter, then pull and hold the trigger to start scanning
surface temperatures. The reading on the lower right represents the average of all readings
recorded during the current measurement scan. When pressing M from a powered OFF
condition, the value shown on the lower right is the average of all readings recorded during the
last measurement scan performed.
High Alarm Limit (HAL)
Use the M button to step to the HAL parameter. Use the arrow buttons to set the High Alarm
limit. While measuring, the meter beeps when the displayed reading is higher than the high
alarm setting. If the backlight is on, the backlight color will turn red in a high alarm condition.
Low Alarm Limit (LAL)
Use the M button to step to the LAL parameter. Use the arrow buttons to set the Low Alarm
limit. While measuring, the meter beeps when the displayed reading is lower than the low alarm
setting. If the backlight is on, the backlight color will turn blue in a low alarm condition.
Datalog Memory (LOG)
The meter has twenty memory locations (1~20) in which to stored temperature readings.
1. From a powered ON or OFF condition, short press the M button to step to the LOG mode
(the LOG display icon is much smaller than the other mode icons)
2. Use the   arrows to select a memory location in which to store a reading
3. Pull and hold the trigger to scan surface temperatures
4. Press the
Note that you can press the
held reading into the selected memory location
5. Use the arrow buttons to step through and view the readings stored in each location.
Dashes indicate that a memory location is empty
6. A reading will remain in a memory location until the user overwrites that memory location
button at any time to store the reading in the selected memory location.
button after the trigger is released in order to store the
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