User Manual

HT79
EN - 7
4.2. DESCRIPTION OF THE SYMBOLS SHOWN ON THE DISPLAY
CAPTION:
1. Auto Power OFF symbol
2. AC quantities symbol
3. DC quantities symbol
4. Active HOLD function
5. Active ZERO function
6. Resistance measuring unit
7. Active continuity test
8. Voltage measuring unit
9. Current measuring unit
10. Active MAX function
11. Active MIN function
12. Low battery symbol
13. Polarity indication
Fig. 3: Display description
4.3. DESCRIPTION OF FUNCTION KEYS
4.3.1. HOLD key
Shortly pressing the HOLD while measuring current allows holding the current value
shown on the display. The symbol “HOLD” is shown on the display. Shortly pressing the
HOLD key again allows quitting the function.
4.3.2. MIN/MAX key
Pressing the MIN/MAX key once activates the detection of maximum and minimum values
of the quantity being tested. Both values are constantly saved and displayed cyclically
every time the same key is pressed again. The display shows the symbol associated with
the selected function: “MAX” for maximum value and “MIN” for minimum value. This
function is not active for resistance measurement and continuity test. Press and hold the
MIN/MAX key or turn the rotary switch to quit the function. With the rotary switch in
position
 , press the MIN/MAX key to select resistance measurement or continuity test.
4.3.3. ZERO key
Pressing the ZERO key once allows zeroing the displayed value and carrying out a relative
measurement of the quantity being tested. When pressing the ZERO key, the value of the
quantity is saved as offset for the following measurements. The message “ZERO” appears
on the display. The instrument shows the relative value obtained as current value – offset.
This function is not active for resistance measurements and continuity test and with
enabled MIN/MAX function. Press the ZERO key again or turn the rotary switch to quit the
function.
4.3.4. Key
Press the
key to activate/deactivate display backlight. This function automatically
deactivates after approximately 30 seconds after being activated, in order not to discharge
the batteries.
4.3.5. Auto Power OFF function
In order to preserve internal batteries, the instrument switches off automatically
approximately 30 minutes after it was last used. The symbol “
” indicates that the Auto
Power OFF function is activated. To disable the function, proceed as follows:
 Switch off the instrument (OFF)
 Press and hold the HOLD key and switch on the instrument by turning the rotary
switch. The symbol “
” disappears from the display
 Switch off and then on again the instrument to enable the function.