HT instruments HT8100 - Manual (Page 8)

HT8100
EN - 7
4.2. DESCRIPTION OF FUNCTION KEYS
The following § describes the functions of the different keys. When pressing a key, the
display shows the symbol of the activated function and the buzzer sounds.
4.2.1. A-HOLD and REL
 keys
 Pressing the A-HOLD key in any function, except for the current generation function
and diode test function, keeps the value of the measured quantity shown on the
display. The message “HOLD” appears on the display. The Auto HOLD function allows
the instrument to provide a steady result on the display even with variable input signal
(> 50dgt). For readings less than 0.1V (V measure), 1mV (mV measure), no limit (other
measures) the A-HOLD feature is not active. Press the HOLD key again, the MODE
key or turn the rotary switch to exit the function.
 Pressing the REL  key in any function, except for ,
, measurements and the
current generation function, allows carrying out the relative measurement of the
quantity to be tested. The symbol “
” appears on the display, initially steady. When
pressing the key, the symbol “
” flashes and the value of the quantity being tested is
saved as offset for the following measurements. The display shows the relative value,
obtained as: relative value (displayed) = current value – offset. Press and hold the
REL
 key for more than 1 second, the MODE key, the RANGE key or turn the rotary
switch to exit the function.
4.2.2. ENTER and CANCEL keys
 Pressing the ENTER key allows activating a function flashing on the display, selected
by means of the 4-arrow selector located on the front panel of the instrument.
 Pressing the CANCEL key allows exiting a function flashing on the display, selected by
means of the 4-arrow selector located on the front panel of the instrument, thus going
back to real time measurement.
4.2.3. HFR and Hz keys
 Pressing the HFR key, which can be used in positions V
, mV and A, allows
activating AC voltage or current measurement in “HFR” mode (see § 4.3.4). Press the
HFR key or turn the rotary switch to exit the function.
 Pressing the Hz key, which can be used in positions V , mV and A, allows
displaying the AC voltage or current frequency measure. The symbol “Hz” is shown on
the display. Press the Hz key, the MODE key or turn the rotary switch to exit the
function.
4.2.4. RANGE and MODE keys
 Pressing the RANGE key allows manually selecting the measuring range of functions
V , mV and
. The symbol “AUTO RANGE” disappears from the display and the
cyclic pressure of the key modifies the position of the decimal point on the display.
Press and hold the RANGE key for more than 1 second or turn the rotary switch to exit
the function and restore the symbol “AUTO RANGE” on the display.
 The MODE key allows:
 Selecting the functions on the rotary switch, highlighted in orange
 Quitting sub-functions selected on the instrument
 Switching from AutoTest mode to Manual mode (see § 4.3.2).
 Disabling the Auto Power OFF function (see § 4.3.6).