Hameg Instruments HM8012 Mode D'emploi page 27

corresponds to the input value less the value
present on the display during initial action on the
HOLD/OFFSET key
means of a second press on the HOLD/OFFSET key.
V/Ω/T°/dB/
(safety terminal for 4 mm banana plugs)
Connection (high potential) for measurements of
voltages, resistances, temperatures and diode
junctions in conjunction with the COM input
(safety terminal).
For safety reasons, the voltage across
this terminal compared to the case
(guard wire, ground) shall be 600 V
most.
HOLD/OFFSET (pushbutton)
Pushbutton for validating the HOLD or OFFSET
functions. Pressing the key the first time will
freeze the front panel display. The HOLD indicator
then comes on. The AUTO, AC-DC, BEEP,
11 and 12 keys are inoperative.
A second press gives access to the relative mode.
The value memorized by the HOLD function is then
subtracted from each measurement before being
displayed. The OFFSET indicator
A third press will freeze the relative value. The
HOLD and OFFSET
fourth press will delete the HOLD and OFFSET
mode.
11
(pushbutton)
Pushbutton for changing to lower range. On each
press, the new range is displayed fleetingly on
the display in code form (L1 for lowest range, L2
for second range, etc.).
12
(pushbutton)
Pushbutton for changing to higher range. Each
time pressed, the new range will be displayed
fleetingly on the display in code form (L1 for
lowest range, L2 for second range, etc.).
13 RS-232 (DB9)
Female DB9 connector intended for serial com-
munication.
14 AUTO (LED)
Indicator signalling that the multimeter is in
AUTOMATIC mode. In this mode, action on keys
11 and 12 is inoperative.
. Activate this function by
at
DC
comes on.
indicators come on. A
C o n t r o l - E l e m e n t s
15 AUTO (pushbutton)
Pushbutton for switching the AUTO range
selection to the MANUAL range selection and vice
versa.
In MANUAL mode, the choice of range is left to
user initiative using the keys
16 Unit display zone (LED)
This zone contains a display of the measurement
units. It also identifies the function selected by
18 or
pressing the
17 AC-DC (pushbutton)
This key is used for selecting the measurement
mode (DC, rms AC or rms AC + DC).
Indicators below indicate the measurement
mode:
DC: measurement of DC voltages
AC: measurement of RMS AC voltages
DC + AC: measurement of RMS AC+DC voltages.
18
(pushbutton)
Pushbutton for selecting the next function.
19
(pushbutton)
Pushbutton for selecting the previous function.
On startup, the unit switches automatically to the
DC voltmeter, MANUAL mode function and 600
voltrange.
Subject to change without notice
11 and 12 .
19 key.
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