HT65
EN - 7
4.2. DESCRIPTION OF FUNCTION KEYS
4.2.1. HOLD/
key
Pressing the HOLD/
key freezes the value of the measured quantity on the display.
After pressing this key, the message
“HOLD” appears on the display. Press the HOLD/
key again to exit the function. Press and hold the same key for longer than one second to
activate and deactivate the display
’s backlight. This function is active in any position of the
rotary switch.
4.2.2. RANGE key
Press the RANGE key to activate the manual mode and to disable the Autorange function.
The symbol
“AUTO” disappears from the upper left part of the display. In manual mode,
press the RANGE key to change measuring range: the relevant decimal point will change
its position. The RANGE key is not active in positions
, Hz% and °C°F. In
Autorange mode, the instrument selects the most appropriate ratio for carrying out
measurement. If a reading is higher than the maximum measurable value, the indication
“O.L” appears on the display. Press and hold the RANGE key for more than 1 second to
exit the manual mode and restore the Autorange mode.
4.2.3. REL key
Press the REL key to activate relative measurement. The instrument zeroes the display
and saves the displayed value as a reference value which subsequent measurements will
be referred to. The symbol
“REL” appears on the display. This function is not active in
position
, Hz% and °C°F. Press the key again to exit the function.
4.2.4. MODE key
Pressing the MODE key allows selecting a double function on the rotary switch. In
particular, it is active in position
to select diode test, continuity test, capacitance
measurement and resistance measurement, in position V
Hz%, mV , LoZV (see §
4.2.5) and
to select AC or DC measurements. In position Hz%, pressing the MODE key
activates/deactivates the frequency (Hz) or duty cycle (%) measurements of electronic
signals (different respect the same of V
Hz% position)
4.2.5. LoZ feature
This mode permits to perform the AC/DC voltage measurement with a low input
impedance in way to avoid the wrong readings due to stray voltage in capacitive coupled.
CAUTION
Inserting the instrument between phase and ground conductors, the RCDs
protection devices can be tripping out during the test. For phase-PE voltage
measurement after a RCD device preliminarily connect the test leads
between phase and neutral cables at least for 5s, then perform the phase-
PE measurement to avoid unexpected trips-out.
4.2.6. Disabling the Auto Power Off function
In order to preserve internal batteries, the instrument switches off automatically
approximately 15 minutes after it was last used. To disable the Auto Power Off function,
proceed as follows:
¾ Switch off the instrument (OFF)
¾ Press and hold the MODE key and switch on the instrument by turning the rotary
switch. The instrument emits quick sounds and the “
” symbol disappears on the
display.
¾ Switch off and then on again the instrument to enable the function.
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