HT instruments HT309 - Manual (Page 7)

HT309
EN - 6
4.2.3. MEM/READ key
¾ Press the MEM/READ key to save the datum shown on the display in the internal
memory. The indication of the memory location (max. 99 locations) and the symbol “M”
appear at the bottom of the display on the left. The control is not active when the HOLD
function is activated. With activated “AVG” function, pressing the MEM/READ key
saves the average (AVG) value of the datum on the display in the memory.
¾
Pressing and holding the MEM/READ key for more than 1 second allows recalling the
data saved in the internal memory on the display. The symbols “MEM” and “R” together
with the number of the last memory location used are shown on the display. Use the
arrow keys T or S to select memory locations. The display shows the corresponding
saved value. Press the MEM/READ key to exit the function.
4.2.4. Deleting the internal memory
To delete the internal memory, proceed as follows:
1. Switch off the instrument using the ON/OFF key.
2. Press and hold the MEM/READ key while switching on the instrument with the ON/OFF
key. The messages “MEM” and “CLr” are shown on the display for a few seconds and
the number of the memory location is taken back to “01”.
4.2.5. MAX/MIN/AVG
functions
Press the arrow key S to view the Minimum, Maximum and Average values of the
measured quantity. The values are constantly updated and are displayed cyclically every
time the same key is pressed. The symbols “MIN”, “MAX” and “AVG” appear on the
display. Press and hold the S key for more than 1 second to exit the function.
4.2.6. Disabling the Auto Power OFF function
In order to preserve the instrument’s internal battery, the instrument switches automatically
off approximately 5 minutes after it was last used. The symbol “ ” appears on the display.
To disable the Auto Power Off function, proceed as follows:
• Switch on the instrument.
• Press and hold the ON/OFF key for more than 1 second. The symbol “ ” disappears
from the display.
• Switch off and then on again the instrument to automatically enable the function.
4.2.7. ZERO
key
Press the ZERO key to carry out the automatic zeroing of the value on the display in case
the indication “000” should be absent when placing the protection cover onto the
photodiode sensor.
The message “AdJ” is shown on the display during this operation. The message “CAP” is
shown on the display in case the ZERO key is pressed with the protection cover not
positioned on the sensor. Insert the cover and repeat the operation, if necessary.