on: This operating mode is recommended when a pas-
sed/rejected statement is to be made.
The loudspeaker will be active if the leak rate falls -
for the first time following the start procedure - below
the treshold value 1. The activation is signalled by a
short acoustic „Beep“.
As soon as the leak rate exceeds the trigger thres-
hold of trigger 1 (see menu item 1) a frequency
modulated signal is produced.
19: LCD Contrast 8 Change contrast for the LCD
text display line (4/2)
The text display (4/2) on the UL 200 is of the liquid
crystal type (LCD).This kind of display offers only a rela-
tively limited optimum viewing angle. For this reason this
menu item offers the possibility of being able to shift the
optimum angle of view in the vertical direction.
21: System BG display off Display / suppress heli-
um background during
Standby
on: In the Standby or Vent mode the internal helium
background of the UL 200 is displayed on the bar-
graph (5/4) of the hand unit and also on the control
panel (4/2) (refer also to the description of the STOP
push-button).
When running measurements for extended periods
of time on samples where the leak rates are high,
helium may accumulate in the leak detector. This
helium background may be displayed via this menu
function.
Note
The actual helium background may be up to
1.5·10
-9
mbar·l·s
-1
less than the displayed value.
off: In the Standby or Vent mode the detection limit is
displayed on the bargraph display (5/4) of the hand
unit and also on the control panel (4/2). During
Standby the reading remains steady and constant.
22: Vent Delay 1.5s Set venting delay time
The push-button (5/2) on the hand unit, or CONTROL
connection (3/12) pins 2 and 4 may be used to initiate
two functions: STOP and VENT (see description of the
STOP push-button). Through this menu item it is possi-
ble to define the delay time until the test connection is
vented when operating the push-button or in the case of
actuation via the control input.
0: The test connection of the UL 200 is vented
immediately after operation of the push-but-
ton or actuation via the control input.
1; 1.5; 2: One of three delay times may be selected.
When the push-button is pressed or the con-
trol input is actuated for a period of time which
is shorter than the delay time specified here,
the UL 200 will only change to the Standby
mode.
When the push-button is pressed or the con-
trol input is actuated for a period of time which
is longer than the delay time specified here,
the UL 200 will vent the test connection and
thus the connected sample.
No vent: No venting can be initiated by operating push-
button (5/2) or via the control input (3/12).
This setting is of particular advantage if inad-
vertent venting of the vacuum system is to be
avoided.
23: System Integration off Switch systems leak
detection mode on / off
off: This setting should be used during normal leak
detection on components. The inlet area of the UL
200 and the conncted test sample can be vented via
the hand unit or by applying external signals (SERI-
AL or CONTROL).The test port (3/2) is vented when
switching the UL 200 off.
on: When operating the UL 200 on an evacuated
system, venting can be suppressed even in the case
of a power failure or when inadvertently switching
the UL 200 off. For this you must select the alterna-
tive „System integration on“. The setting which has
been selected menu item 22 is overruled.
24: Request for CAL off Automatic request for
calibration
Through this function the operator may be reminded of a
necessary calibration.
on: The operator is reminded of the fact that a calibrati-
on has become necessary. The LCD display (4/2)
will indicate the message „Request for CAL“. It is
then left to the user to run the calibration or simply
acknowledge the message by pressing the CLEAR
push-button (4/10) and continue with the measu-
rements. A request for calibration is issued when 1/2
hour has elapsed after having switched the instru-
ment on or if the housing temperature in the pream-
plifier has changed by over 5 °C compared to the
temperature during the most recent calibration.
off: The user is not reminded of the fact that a calibrati-
on has become necessary.
25: Mass 4 Select mass
Here the mass setting may be changed between 2, 3 or
4 amu. For helium you must select mass 4.
26: Date 09.Apr.96 Set date and time
Here date and time may be entered. If a printer is
connected to the SERIAL socket, then the leak rates
may be logged together with a date and time stamp.
Moreover, date and time are used for logging of war-
nings, error messages and during the output of the sta-
tus log (see service menu item 52 and 53).
21
TH 10.211/8.02 - 12/97
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