Description Of Function Keys; Hold/Rel Key; Range Key; Function Keys F1, F2, F3, F4 - HT HT64 Manuel D'utilisation

HT64
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
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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
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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
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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%,
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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
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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).
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