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HT64
EN - 7
4.2. DESCRIPTION OF FUNCTION KEYS
4.2.1. HOLD/REL
key
Pressing the HOLD/REL 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/REL
key again to exit the function. To save the vale on the display, see § 4.3.3.
Press and hold the HOLD/REL key for a long time in order to activate/deactivate relative
measurement. The instrument zeroes the display and saves the displayed value as a
reference value which subsequent measurements will be referred to (see § 4.3.4). The
symbol
“
”
appears on the display. This function is not active in position
. Press and
hold the HOLD/REL key again to exit the function.
4.2.2. RANGE
key
Press the RANGE key to activate the manual mode and to disable the Autorange function.
The message
“
Manual
”
appears on the upper left part of the display instead of
“
AUTO
”
. 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%,
Temp°C°F, mV
, 10A
and 4-20mA%. 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. Function keys F1, F2, F3, F4
Use keys F1, F2, F3 and F4 to manage the instrument
’
s internal functions (see § 4.3).