HT instruments HT157 - Manual (Page 10)

HT155 - HT157
EN - 8
4.4. DISPLAY CONTRAST ADJUSTMENT
The instrument allows adjusting the display contract, proceeding as follows:
1. Turn on the instrument by pressing the key. The display shows the following
screen:
Fig. 4: Display contrast adjustment
2. Within 5s, press the arrow keys “
” and “ ” respectively to decrease or increase the
contrast level of the display. This parameter is shown in the upper right-hand part of the
box “Realtime Analyzer”. Up to 30 contrast levels are possible
4.5.
TURNING ON/OFF THE INSTRUMENT
Respect the following instructions when turning on and off the instrument
 Press the
key to turn on the instrument. The main screen in which the possible
measuring modes are listed is shown on the display. Use the keys “ ” and “ ” for
selecting and confirm with “ ”. If no key is pressed within 5s, the instrument
automatically sets itself to the last mode used
 Pressing
the key when measuring automatically resets the system and brings the
instrument back to the initial selection menu
 Press the
key to turn off the instrument. With the instrument turned off, the
instrument’s clock does not stop working thanks to the internal back-up battery. This
battery is continuously recharged when the instrument is measuring and at least 24
hours are necessary for a complete charge. With fully charged back-up battery, the
internal clock is maintained for over 3 months
 The measurement results are saved in an internal flash memory and are always
maintained even with no external power supply or with the instrument turned off