TH 10.211/8.02 - 12/97
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CLEAR push-button
The CLEAR push-button (4/10) is used to cancel pro-
cesses and functions which have been started. Moreo-
ver, this push-button may be used to acknowledge war-
nings and error messages.
Also this push-button may be used to reset a value which
has been changed through VALUE in a menu.
ENTER push-button
The ENTER push-button (4/8) is used to acknowledge
and accept parameters which have been set up on the
UL 200.
If several parameters can be changed in a single menu
line, pressing of this push-button advances to the next
parameter.
When the parameter is being accepted, the message
„Updating Parameter“ is displayed briefly or the next
parameter is indicated.
MENU push-button
The MENU push-button (4/7) permits many entries
though which instrument settings can be made or for
running of special instrument functions. For this also
refer to Chapter 2.5.
Pressing the MENU push-button (4/7) lets the instrument
enter the menu mode and this mode can be exited by
pressing the MENU push-button once more.
After pressing the MENU push-button, that menu line
which was active upon leaving the menu mode before is
displayed.The desired menu line is selected by pressing
the SCROLL push-button (4/5).
Within a menu line, the settings or values are changed
by pressing the VALUE push-button (4/6).
Each change which is made within a menu line must be
acknowledged by pressing the ENTER push-button
(4/8). Otherwise the changed value will not be accepted
by the UL 200.
LED is the push-button is on: menu mode is active.
LED in the push-button is off: menu mode is inactive.
SCROLL push-button
The SCROLL push-button (4/5) permits the selection of
a menu items. Also refer to Chapter 2.5.1.
VALUE push-button
With the aid of the VALUE push-button (4/6) it is possi-
ble to change settings or values. Only the parameters
which flash can be changed by operating the VALUE
push-button. Also refer to Chapter 2.5.1.
2.4.4 Controls on the Hand Unit
An overview of the controls on the hand unit is given in
Fig. 5.
START push-button
Based on the operating modes Standby or Vent of the UL
200, the START push-button (5/3) is used to start the
measurement mode by evacuating the connected test
sample. Here the UL 200 will operate either with auto-
matic ranging or it will only display the measured values
within a fixed range which has been selected by the ope-
rator (Manual).
The status of measurement readiness is indicated to the
operator by a green LED at the START push-button.
During the pumpdown phase this LED flashes. As soon
as the status of measurement readiness has been rea-
ched, this LED stays on continuously.
When pressing the START push-button in the Standby
mode, the internal Zero level is taken over anew, provi-
ded the UL 200 has been running in the Standby or Vent
status for at least 10 s.
STOP / VENT push-button
The STOP / VENT push-button (5/2) has two different
functions, depending on how long it is pressed:
STOP function
Based on the measurement mode of the UL 200, a
brief press of the STOP push-button (5/2) interrupts
the evacuation process of the test sample and the
measurement mode is interrupted.The duration of this
key press must be no longer than the time which is
defined in menu item 22 (see Chapter 2.5.4). The
default time is 1.5 s. The UL 200 will return to the
Standby mode, i.e. all valves except valve V2a (2/3)
are closed. This condition is indicated to the operator
by the green LED in the START push-button (5/3)
which is turned off.
After pressing the STOP / VENT push-button (5/2) the
LCD display (4/2) will indicate the message „Standby“.
VENT function
When pressing the STOP / VENT push-button (5/2) for
a period of time which exceeds the time as defined in
menu item 22 (1.5 s default), the connected test sam-
ple is vented as soon as this time has elapsed.This is
done by opening of the venting valve V3 (2/10). This
operating mode is indicated to the operator by the
green LED in the STOP / VENT push-button which
comes on.
The venting valve may be closed again by pressing
the STOP / VENT push-button briefly once more. The
UL 200 will then return to the Standby mode. The
„VENT“ display is turned off.
In the Standby mode and after a transitional period of
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