LEYBOLD 157 89, Manual

Page: 12 / 40

2.3.7 Key Decrement
The decrement key (5/3) is used for setting up the trig-
gers and other instrument parameters. Each time this
key is pressed, the displayed mode is decremented by 1;
in the case of numeric values the least significant digit is
decremented by 1.
When pressing the decrement key for more than 2 s
while setting up the triggers, the range of values will pass
through rapidly.
2.3.8 Key Increment
The increment key (5/2) is used for setting up the triggers
and other instrument parameters. Each time this key is
pressed, the displayed mode is incremented by 1; in the
case of numeric values the least significant digit is incre-
mented by 1.
When pressing the increment key for more than 2 s while
setting up the triggers, the range of values will pass
through rapidly.
2.3.9 Key PARA
The „PARA“ key (5/1) is used for switching the instru-
ment to the parameter mode, where individual parame-
ters of the instrument may be checked, set up or where
the parameter settings may be locked.
Note
The preselected setting (see setting AUTO.1) for pressu-
re dependent switching of the PENNINGVAC channel
through Thermovac channel 2 is displayed at pressures
above (below) the threshold of the TM 2 channel (PM
channel). When then pressing the key PM (TM 2) the
corresponding pressure reading of the PM channel (TM
2 channel) will be displayed. After 1 minute the display
will automatically revert back to the TM 2 channel (PM
channel).
2.3.9.1 Checking and setting up of the equipment
parameters
The PARA (5/1) key is pressed when wanting to check or
change the settings of the various instrument parame-
ters. The PARA message in the status display area
comes on and the first parameter page of the currently
selected measurement channel is displayed.
Pressing the PARA key once more selects the next para-
meter page.
The currently selected parameter page number is indi-
cated by the bar graph display (2/7). The number of
active bars (starting from the right hand side) corre-
sponds to the number of the currently selected parame-
ter page. For technical reasons only parameter page
numbers starting with No. 3 are displayed in this way, i.e.:
3 bars correspond to parameter page 3,
4 bars correspond to parameter page 4 etc.
On the individual parameter pages, the parameters
themselves may be changed by the decrement key (5/3)
and the increment key (5/2). Any entries made via the
decrement (5/3) or increment (5/2) keys become imme-
diately effective.
Note
When no key is operated for approximately 1 minute the
CM 31 will automatically switch back to the measure-
ment mode, whereby the settings which were displayed
at the time of leaving the parameter page are stored.
If no changes in the display are noticeable when opera-
ting the decrement (5/3) or increment (5/2) keys, access
to the parameter entry mode has been locked before-
hand. This condition is also indicated by the LOCK mes-
sage.
The parameter mode may be left by
- operating any measurement channel selection key or
- automatically after displaying the last parameter page.
All changes will become stored and active automatically.
12
Key to fig. 5
1 Key PARA
2 Increment parameter
3 Decrement parameter
Fig. 5 Partial view of the front panel