76: Selection of the post amplification factor / display of
A/D converter voltage
First the second password has to be entered in service
menu 50.
Caution When switching off the automatic func-
tions, the built-in safety functions are
partly disabled. Misoperation can lead to
conditions where the leak detector may
be impaired.
off: Autoranging, Autozero as well as fault and emission
monitoring are switched off. The push-buttons CAL,
START and STOP are disabled.
on: When the automatic function is switched on, the
UL 200 will restart (warm boot).
71: Valve Supply Auto Select valve supply voltage
Auto: In order to reduce energy dissipation, valves V1,
V2a, V4, V4.1, V6 and V7 are only briefly connec-
ted to the 24 V supply voltage (t = 200 ms) when
actuated.Then the supply voltage drops to the hol-
ding level of U = 7.8 V.
High: The supply voltage remains at the 24 V level. The
voltage is not reduced.
72: 12a2b3 V 4 Display valve status
Displayed to the right of the menu item number „72:“ on
the LCD display (3/2) are those valves which are open at
the moment. With the push-buttons VALUE and ENTER
the valves may be opened and closed manually. Howe-
ver, before doing so, the automatic function must be swit-
ched off first (service menu item 70).
73: Emission On Switch emission on / off
When selecting this menu item, the current emission sta-
tus is indicated first.
It is possible to switch the emission of the ion source on
and off manually.
On: The emission is or has been switched on.
Off: The emission is switched off. The other supply vol-
tages for the ion source remain switched on.
74: Anode M4 492V 10.000V Run manual mass
alignment
Display anode voltage:
The anode voltage which corresponds to masses M2,
M3 and M4 is displayed. Valid voltage ranges are:
M2: 785 ... 995 V
M3: 510 ... 670 V
M4: 390 ... 520 V
The mass number may be selected via the VALUE push-
button.
TH 10.211/8.02 - 12/97
56: Cycles V1 0012354 Display valve cycle counter
Here the number is displayed which indicates how often
the valve has been opened. The desired valve may be
selected through the Value push-button.
57: Operat. Time 111111h Operating hours counter
Displays the number of operating hours of the UL 200.
58:Task 00.00.00 Display process status
In the UL 200 several tasks are run in parallel.This menu
item provides further servicing information.
59: Offset 00.000 V Display characteristic quantities
for leak rate calculations
Offset Value of the offset in volts. As soon as
the UL 200 has been running in the
Standby mode for more than 20 s, the
offset value is updated when changing
from Standby to Measure. This offset
value multiplied with the factor Fine pro-
duces as a result the internal helium
background of the measurement sy-
stem which is subtracted from the mea-
surement signal during subsequent
measurements. In the case of a clean
measurement system this value must
be less than 10 mV.
Factor Fine Calibration factor for vacuum leak
detection
2
)
(default: 7.265 E-13).
Factor G/F Sensitivity ratio between the vacuum
ranges GROSS and FINE
(1.000 ... 3.000). The ratio is defined in
service menu item 92.
Factor Resistor True ratio of the most sensitive pream-
plifier resistors; see menu item 92
(30.00 ... 40.00). The factor is determi-
ned in service menu item 92.
Factor SN Calibration factor for standard sniffer
leak detection
2)
(default: 7.265E-13).
Factor SQT Calibration factor for Quicktest sniffer
leak detection
2)
(default: 2.906E-10).
2)
The calibration factor is determined during an external calibration.
The smaller the factor, the more sensitive the complete detection
system of the UL 220 will be. The actual calibration factors may be
by a factor of 2 greater or lower that the default value.
70: Automatic on Switch automatic function
on / off
If changes are to be made to any of the automatically
controlled functions, the automatic functions must be
switched off first. This is required when wanting to make
changes to the following service menu items:
54: Output of the mass spectrum
72: Manual operation of the valves / display valve status
75: Display preamplifier voltage / selection of the opera-
ting resistor
24
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