HT HT22D Manual De Instrucciones página 30

4.2. FUNCTION KEYS DESCRIPTION
HOLD/ key
Pressing the HOLD/
quantity on the display. After pressing this key, the message "H"
appears on the display. Press the HOLD/
function. Press and hold the HOLD/
'
the display s backlight. The backlight is automatically disabled
after approx. 3 minutes of idleness.
MODE key
The MODE key is used in position
measurement, continuity test, diode test and capacity test
A
"
position ", "mA
measurement.
In position " VFDHz%" press and hold (>2s)
activate/deactivate the VFD (Variable Frequency Driver) function
which allows to perform an evaluation of the AC voltage
downstream of variable frequency regulators (Inverters) eliminating
the harmonic components of disturbance at frequencies higher than
400Hz obtaining a stable value on the display. The "UFd" message
is shown for an instant with the VFD function active and the "End"
message is shown for an instant with the VFD function deactivated
RANGE key
Press the RANGE key 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%,
the instrument selects the most appropriate ratio for carrying out
measurement. If a reading is higher than the maximum measurable
value, the indication
the RANGE key (or upon switching on the instrument again) allows
quitting the manual mode and restoring the Autorange mode
Hz% key
By pressing Hz% key the selection of frequency and duty cycle
measurements on
performed. The frequency range is different in these two positions
Disabling the Auto Power OFF function
To preserve internal batteries, the instrument switches off
automatically approximately 15 minutes after it was last used. The
" "
symbol appears on the display. To disable the Auto Power Off
function, proceed as follows:
•
Switch off the instrument (OFF)
•
Press and hold the MODE key, switch on the instrument by
turning the rotary switch. The symbol
display
•
Switch off and then on again the instrument to enable the
function
30
key freezes the value of the measured
key to activate/deactivate
" 
"
" and "10A to select AC or DC c
, and
" "
O.L appears on the display. Long pressing
VFDHz% and Hz% positions of selector is
HT22D
key again to exit the
"
to select resistance
and
urrent
MODE key
. In Autorange mode,
" "
disappears from the
in
to