LEYBOLD UL 200 - Page 19

red values at intervals of 20 ms, provided the
most sensitive preamplifier area has been sel-
ected.
Switchover occurs at a leak rate of about
1·10
-6
mbar·l·s
-1
. This kind of averaging also
applies when determining the offset. The cali-
bration factor is calculated with normal filtering.
Note
When manual ranging has been selected (MANUAL 4/8),
the exponent „-10“ can be selected also in the „normal“
status.
The resolution limit also affects the display in the Stand-
by mode.
12: Display LR + PE Select information which is to
be displayed on the LCD (4/2)
Information is displayed on the LCD panel (4/2) during
the measurements. One may select between three diffe-
rent information modes:
LR + UNIT: Leak rate and unit are displayed.
LR + PE: Leak rate and inlet pressure are displayed.
PE + PV: Inlet pressure and forevacuum pressure are
displayed.
13: Recorder LR Select chart recorder function
(3/11)
In the extended menu it is possible to define the assign-
ment of the chart recorder outputs. Depending on what
is the selected the following assignments result:
a) Selected assignment: LR
Pin Assignment
————————————————————————
1 Leak rate mantissa
U = 0.1 to 10 V for manual ranging
U = 1 to 10 V for automatic ranging
2 GND, reference ground
3 GND, reference ground
4 Leak rate exponent (step function)
U = 1 to 10 V; 0.5 V / decade starting at
1 V = 1·10
-12
mbar·l·s
-1
/ 1·10
-12
Pa m
3
·s
-1
.
b) Selected assignment: LR + PE
Pin Assignment
————————————————————————
1 Leak rate, logarithmic
U = 1 to 10 V; 0.5 V / decade starting at
1 V = 1·10
-12
mbar·l·s
-1
/ 1·10
-12
Pa m
3
·s
-1
.
2 GND, reference ground
3 GND, reference ground
I4 nlet pressure PE, logarithmic
U = 1 to 10 V; 0.5 V / decade starting at
1 V = 1·10
-3
mbar / 1·10
-3
Pa.
c) Selected assignment: PE + PV
Pin Assignment
————————————————————————
1 Inlet pressure PE, logarithmic
1 U = 1 to 10 V; 0.5 V / decade starting at
1 V = 1·10
-3
mbar / 1·10
-3
Pa
2 GND, reference ground
3 GND, reference ground
4 Forevacuum pressure of the TMP PV,
logarithmic
U = 1 to 10 V; 0.5 V / decade starting at
1 V = 1·10
-3
mbar / 1·10
-3
Pa
19
TH 10.211/8.02 - 12/97
10
Pin 4
2 3 5 6
0
7 8 941
10 U [V]
10
-12
10
-10
10
-8
10
2
10
4
10
-6
10
-4
10
-2
10
0
mbar·l·s
-1
Pa m
3
·s
-1
10
Pin 1
2 3 5 6
0,1
7 8 941
2 3 5 6
0,1
7 8 941
Mantissa
10 U [V]
10
10
Pin 1 LR
Pin 4 PE
2 3 5 6
0
7 8 941
10 U [V]
2 3 5 6
0
7 8 941
10 U [V]
10
-12
10
-10
10
-8
10
-6
10
-4
10
-2
10
0
10
-3
10
-1
10
3
10
5
10
+1
mbar·l·s
-1
Pa m
3
·s
-1
mbar / Pa
10
10
Pin 1 PE
Pin 4 PV
2 3 5 6
0
7 8 941
10 U [V]
2 3 5 6
0
7 8 941
10 U [V]
10
-3
10
-1
10
+1
10
3
10
5
10
5
10
-3
10
-1
10
3
10
+1
mbar
Pa
mbar
Pa