Hameg HM8012 Handbuch Seite 30

put the instrument in one of these states at any
time.
Mode commands
Mode commands correspond to the "MODE"
key on the front panel.
DC<CR> switches the instrument to the DC
measuring mode.
AC<CR> switches the instrument to the AC
measuring mode.
AD<CR> switches the instrument to the AC +
DC measuring mode.
BY<CR> activates the continuity test beep.
DN<CR> deactivates the continuity test beep.
If the requested mode is not compatible with the
current function (e.g.: sending the AC command
while the instrument is measuring resistances),
the instrument will indicate this by a beep in the
same way as for the front panel control. In
addition, the control error indicator is set (see
command E7).
Range modification commands
These correspond to the "RANGE" keys on the
front panel.
AY<CR> switches to automatic range change
AN<CR> switches to manual range change
R+ <CR> switches to the next higher range
R- <CR> switches to the next lower range.
If it is impossible to activate or deactivate the
autoranging the current function (e.g. following
the AM command to switch to current
measurement the AY command cannot be
executed since the measurement is made in a
single range for this function) or if it is impossible
to change ranges, the instrument will send a
beep. In addition, the command error indicator is
then set (see command E?).
Display type commands
These correspond to the choice of the HOLD
OFFSET key on the front panel.
HD<CR> switches the instrument to HOLD
01 <CR> switches the instrument to OFFSET
(Single)
00<CR> switches the instrument to NORMAL
L1<CR> locks the front panel. In this case,
pressing a front panel key will cause the "rtEOn"
message to appear.
L0<CR> is a way of unlocking the front panel.
Subject change without notice
The NORMAL type corresponds to a display
without a reference (OFFSET) and without
maintaining (HOLD) the front panel state. In the
same way as for the manual control, it is
impossible to switch to the OFFSET mode
without first going to the HOLD mode. Indeed,
the maintained measurement is used as a
reference.
The possible steps are therefore:
NORMAL (HD) ® HOLD (01) ® OFFSET (HD) ®
OFFSET + HOLD (00) ® NORMAL
Unlike the manual command, it is possible to
return directly to the NORMAL mode at any time
during command 00.
Status commands
The status commands are used for recovering
the status of the instrument. The returned
information consists of ASCII character strings,
each terminating in a <CR>.
I? <CR>
Request for equipment identification which
returns:
HAMEG, HM8012,,V1.03<CR>
I.e.: manufacturer, instrument reference, void and
software version (Firmware).
F? <CR>
Requests current measurement function. The
instrument returns one of the following strings:
VOLT<CR>
AMP<CR>
MAMP<CR>
OHM<CR>
DIODE<CR>
TDGC<CR>
TDGF<CR>
DB<CR>
M? <CR>
Requests current measurement mode. The
instrument returns one of the six following
strings:
AC<CR>
DC<CR>
AC+DC<CR>
BEEP ON<CR>
BEEP OFF<CR>
The two last responses are only obtained during
resistance measurement. One indicates that the
audible continuity test signal is active and the
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