Metrohm 774 Oven Sample Processor - Manual (Page 34)

3 Introduction
774 Oven Sample Processor, Instructions for use 28
3.1.6 Lock keyboard functions
Particular areas of the operator dialog can be made inaccessible to un-
trained operators by locking individual dialog areas or keys. In this way the
accidental overwriting of a method or even the alteration of parameters can
be prevented.
The menu '>keyboard options' for the corresponding functions is opened
by holding down the <CONFIG> key when the Oven Sample Processor is
switched on. Alternatively this can be done by triggering a reset with
<CLEAR> and then pressing the <CONFIG> key within 0.4 seconds.
This menu can even be accessed when the complete keyboard has previ-
ously been locked.
The individual keyboard areas which can be locked are:
whole keyboard
In routine operation where only a single method is used it may be neces-
sary to prevent manual manipulation. For this reason it is possible to lock
(almost) all keyboard keys. The <START>, <STOP> and <CLEAR/ RE-
SET> keys are always accessible so that starting and interrupting methods
is always possible. If the Oven Sample Processor is operated with PC soft-
ware this may also be necessary. In this case it is possible to do without the
keyboard and to remove it completely.
'lock keyboard: on' locks all keyboard keys (exceptions: see above).
lock configuration
The basic configuration can be protected against overwriting. All settings of
the configuration menu are no longer accessible.
'lock configuration: on' locks the <CONFIG> key.
lock parameters
If operator-defined methods are normally used then it may be necessary to
ensure that the stored method parameters cannot be altered. The parame-
ter menu can therefore be made inaccessible.
'lock parameters: on' locks the <PARAM>key.
lock method memory functions
Preventing the accidental deletion of stored methods makes sense. The de-
letion of methods should only be possible after deliberately switching off the
locking function.
'>user methods' + <ENTER> opens the submenu for locking method
memory functions.
'lock method recall: on' locks method loading.
'lock method store: on' locks method saving.
'lock method delete: on' locks method deletion.