Model 42525A Version 4.0 5/05
7
Max/Min Recording
The Max/Min Recording feature offers the user to view only the highest (maximum MAX)
or the lowest (minimum MIN) reading. Press the REC button once to activate this feature
(the REC symbol will appear on the LCD). Press the REC button again to view only the
maximum reading (MAX). Press the REC button again to view only the minimum reading
(MIN). Press and hold the RECORD button again until the REC/MAX/MIN icons switch off
to return to normal operation.
Laser Pointer Operation
This 42525A is equipped with a laser pointer that is used to aim the
IR sensor more accurately. Simply press the meter trigger to activate
the laser pointer. Be extremely cautious when directing the laser
beam, shining the laser beam into someone's eye can cause serious
injury. Point the laser beam toward the device under test whose
temperature is to be measured.
Offset Adjustment
The OFFSET function allows the user to adjust the temperature readings in fine detail to
match an external calibrator, to compensate for display drift, or for other diagnostic uses.
Press and hold the HOLD and the REC buttons simultaneously. The small digits on the
lower right will match the temperature display of the larger digits when the two buttons are
held down correctly. While continuing to hold down the two keys, press the UP or DOWN
buttons to set the offset value on the larger digits. Release all keys to return to normal
operation.
Type K Thermocouple Measurement Procedure
1. Connect a Type K Thermocouple to the temperature input jack on the meter.
2. Power the meter by pressing the POWER button.
3. Use the IR / TYPE K button to select Type K mode (display will show ‘K’).
4. Set the temperature units (degrees C or F) using the C/F button.
5. Place the Thermocouple in the area where the temperature is to be measured.
6. Read the LCD display for the temperature measurement.
Type K Measurement Considerations
When a Type K Thermocouple is first connected to the meter and the thermocouple and
meter temperatures are different, several minutes should be allotted so that the
temperature of the socket matches the temperature of the thermocouple. The cold junction
compensation circuitry can then operate efficiently, allowing the meter to provide
measurements with optimum accuracy.
Auto Power Off
The meter will automatically power off after approximately 10 minutes in both IR and
Thermocouple measurement modes. To disable this feature, press the REC button.
RS-232 Serial PC Interface
This instrument includes a built-in RS-232 serial data port. This interface is intended for
use with the optional Data Acquisition Software and Cable . For more information, contact
Extech or refer to the manual with software package.
