Extech Instruments AN300 User Manual page 7

Data Hold Mode
1. Press the HOLD button from the normal operating mode to freeze the current measurement.
2. The 'HOLD' icon will appear at the top of the LCD display.
3. Press HOLD again to return to normal operation. The 'HOLD' icon will switch OFF and the
meter will return to displaying readings in real time.
MAX/MIN Mode
The MAX‐MIN feature records the highest (MAX) and lowest (MIN) readings captured since the
meter was switched ON.
1. Press and hold the MAX/MIN button for 2 seconds to begin displaying the lowest (minimum)
readings encountered since this mode was accessed. The 'MIN' icon will appear at the top of
the LCD display indicating that the readings shown are the lowest measured.
2. Press and hold the MAX/MIN button again for 2 seconds to display the maximum readings
encountered. The 'MAX' icon will appear on the LCD.
3. Press and hold this button again for 2 seconds to return to the normal mode of operation
(the 'MIN' and 'MAX' icons should switch OFF).
4. While viewing the MAX or MIN data, use the L/mode button to switch the display so that the
Air Volume MIN and MAX readings can be viewed also.
5. Press and hold MAX/MIN for 2 seconds to return to the normal operation mode.
Multi‐Point Average Mode
1. From the normal operating mode press the U/mode button for 2 seconds to enter Multi‐
Point Average mode (the AVG display icon and the associated black dot • will switch ON).
2. Press the HOLD button momentarily to record one reading. The upper display digits will
show the reading's memory location number and the lower display will show the measured
value. Press the HOLD button again to take and store another reading; the memory location
number will increment by one and the current reading will be stored in this new memory
location.
3. Press U/mode momentarily to see the multi‐point mean (average) for all of the readings
recorded during the session (the '•AVG' display icon will flash during this process).
4. Press L/mode to view the average reading for the other available parameters.
5. Press U/mode momentarily to return to the normal operating mode.
Timed Average Mode
1. From the normal operating mode, press and hold the U/mode button for 2 seconds to enter
the Multi‐Point Average mode first and then press U/mode one more time momentarily to
enter the Timed Average Mode (the AVG and the elapsed timer icons will switch ON).
2. Press HOLD to begin recording. The elapsed timer starts (as shown on the upper display
digits) and the clock icon flashes on and off.
3. Press U/mode to stop the clock and to calculate the timed average. The upper LCD will
display the elapsed time and the lower LCD will show the averaged readings. The LCD will
flash the 'AVG' and the elapsed timer icons.
4. Press L/mode to view the average for other available measurements.
5. Press U/mode to return to the normal operating mode.
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