HT701
EN - 9
4.3. INTERNAL MODES OF THE INSTRUMENT
4.3.1. Deactivation of the Autobacklight function
The instrument has a display backlighting function (see Fig.1 – part 1) which activates
automatically in conditions of poor visibility. The function deactivates automatically after a
few seconds. To manually disable the function, proceed as follows:
1. Switch off the instrument (OFF).
2. Turn the rotary switch in any position, keeping the MAX/MIN key pressed until the
display has completely turned on.
3. Switch off and then on again the instrument to enable the function.
4.3.2. Deactivation of the Auto power off function
In order to preserve internal batteries, the instrument switches automatically off 20 minutes
after it was last used. The symbol “APO” appears on the display when this function is
active. When the instrument must be used for long periods of time, it may be useful to
deactivate the Auto Power Off function as follows:
1. Switch off the instrument (OFF).
2. Turn the rotary switch in any position, keeping the MODE key pressed until the display
has completely turned on. The symbol “APO” disappears.
3. Switch off and then on again the instrument to enable the function.
4.3.3. AutoTest and Manual Test mode
In measuring functions “V”, “mV” and “mA” it is possible to use the following two modes:
AutoTest
it allows the automatic detection of AC or DC measurement of voltage or
current. The message “AUTOTEST” is shown on the display. This is the mode set
whenever the instrument is switched on.
Manual Test
it allows manually setting the AC or DC measurement of voltage or
current.
Press the MODE key to switch from AutoTest mode to Manual mode. The message
“AUTOTEST” disappears from the display and the modes “DC” or “AC” can be selected by
pressing the MODE key again. Press and hold the MODE key for 2 seconds to go back to
the AutoTest mode, or switch off and then on again the instrument.
4.3.4. HFR
mode
In measuring function “V
”, when pressing the MODE key in Manual mode, it is possible to
select “HFR” (High Frequency Reject) measurement. In this case, the AC voltage
measurement is carried out considering a maximum signal frequency of 500Hz, and this
allows eliminating different harmonic components from it.
Press the MODE key to exit the “HFR” mode.
4.3.5. SMOOTH
mode
In insulation resistance measuring mode, by pressing the MODE key it is possible to select
the “SMOOTH” mode, which enables a greater stability of the result displayed. Press the
MODE key to exit the “SMOOTH” mode.
4.3.6. Integrity test on internal fuse
The instrument allows testing the status of the internal fuse as follows:
1 Insert a test lead into input terminal Hz°CV
.
2 Turn the rotary switch to
. Press the MODE key to select diode test (symbol
“
” on the display).
3 Insert the test lead into input mA. With indication of a result typically <2V
Fuse OK.
With indication “OL”
the fuse must be replaced.
