Operation - Extech Instruments EA15 User Manual

Operation

Connecting thermocouples
Turn Power ON
Selecting thermocouple type
Selecting °C, °F or °K units of measure
Selecting T1, T2, and T1-T2 Displays
Data Hold
MIN, MAX, AVG Recording Function and Timer
Backlight
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1. This meter accepts two thermocouples with spade plugs (sub-miniature type K with one spade
wider than the other).
2. Plug the thermocouple(s) into the meter's T1 and/or T2 thermocouple input jack(s).
3. Always check the LCD display for the proper thermocouple type selection.
Press the button to turn power on. The meter will perform a short self-test. When a
thermocouple is not plugged into the selected input, or if a thermocouple is "open", the display will
show "- - - - -". The default thermocouple type, units and display configuration are determined from
the parameters selected when the meter was last used.
Press the TYPE button to select the type of thermocouple.
Press the C/F/K button to select the unit of measure.
Press the T1 T2 T1-T2 button to step through and select from the following displays:
a. T1 (thermocouple 1) is the primary display; T2 (thermocouple 2) is the lower display
b. T2 is the primary display and T1 is the lower display
c. T1-T2 (difference between T1 and T2) is the primary display and T1 the lower display
d. T1-T2 is the primary display and T2 is the lower display
Notes:
 To avoid electrical shock or personal injury, do not apply more than 20Vrms, between the
thermocouples, or between any thermocouple and earth ground.
 If voltage on the measurement surface results in potentials of more than 1V, measurement errors
may occur.
 If a potential exists between the thermocouples, use electrically insulated thermocouples.
Press the HOLD button to freeze the displayed reading. The 'H' HOLD icon will appear on the
display. Press the HOLD button again to return to normal operation.
Press the MX/MN button to begin capturing the Minimum (MN), Maximum
(MX), and Average (AVG) temperature values. The Elapsed Time clock
will appear on the lower left of the display. The primary display shows the
current temperature. The lower display will indicate the MX, MN or AVG
value (depending on which is selected) captured since the MX/MN button
was pressed.
1. Press the MX/MN button to step through the MX, MN or AVG display Each reading will be
accompanied by a Timer value indicating the time the reading was recorded

2. Press and hold the ' ' button to change the elapsed time format from min:sec to hour:min
3. Press and Hold the MX/MN button to exit the MX/MN function.
Press the backlight button to switch on the LCD display backlight. The backlight will
automatically switch off after one minute (press button again to turn the light off manually).
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