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Les langues disponibles
HT77C
4.3.
DESCRIPTION OF FUNCTIONS KEYS
4.3.1.
/
key
Press and hold the
/
key for 2s allows switching on the clamp. While switching on, the
display shows the charge percentage of the power supply battery. Replace the batteries
when the 0% appears (see § 6.2). To switch off the clamp, Press and hold the
/
key
for 3s. With instrument switching on press the
/
to activate/deactivate the display
backlight.
4.3.2. HOLD/MAXMIN key
The press of HOLD/MAX/MIN key allows to activate/deactivate the frozen of value on the
display. The "HOLD" message is shown.
Press and hold the HOLD/MAXMIN key for 2s allows to activate the detection of the
parameter maximum and minimum values. Both values are stored in memory and they can
be shown cyclically when pressing "MIN MAX" key. The display shows the symbol linked
to the selected function: "MAX" for maximum value, the symbol "MIN" for minimum value
and the "MAX MIN" symbol for the
for simultaneous detection of MAX and
MIN. In this
case the instrument return to normal measurement mode. Press and hold again the
HOLD/MAXMIN key for 2s to exit from the function.
4.3.3. RANGE key
Press the RANGE key to activate the manual mode and to disable the Autorange function.
The symbol
"
Auto
"
disappears from the display. Press the RANGE key to change
measuring range: the relevant decimal point will change its position. 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
"
OL
"
appears on the
display. Press and hold the RANGE key for 2s to exit the manual mode and restore the
Autorange mode
4.3.4. HFR key
Pressing the HFR (High Frequency Rejection) key allows enabling the low-pass filter,
which has a cutting frequency of approx. 200Hz (message "50-60Hz" on the display) or a
low-pass filter, which has a cutting frequency of approx. 1kHz (message "1kHz" on the
display)
in order to eliminate the harmonic content on the measured current. Press the
HFR key a third time to return to normal measurement mode.
4.3.5.
/
key
Pressing the
/
key allows to activate/deactivate the Bluetooth connection. In this
condition is possible to connect the instrument to an external mobile device through the
dedicated HTLeakage APP (see § 5.3). Pressing the
/
key for 2s allows to
activate/deactivate the white LED torch (see Fig. 1 – part 2)
4.3.6. Disabling the Auto Power Off function
In order to preserve internal batteries, the instrument switches off automatically
approximately 20 minutes after it was last used. To disable the Auto Power Off function,
proceed as follows:
➢ Switch off the instrument (OFF)
➢ Press and hold the HFR key and switch on the instrument with
key. The "AoFF"
/
message is shown for a while and the "APO" symbol disappears on the display
➢ Switch off and then on again the instrument to enable the function
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