BERTHOLD TECHNOLOGIES LB 444, Operating Manual

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04/03
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LB 444
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The instrument is operated via six foil keys.
Three keys work as softkeys which allow user-guided definition of all instrument settings
and input of the required parameters.
Three more keys serve as function keys.
The front panel includes a RS 232 interface port . Data can be transferred to a PC using
a terminal program.
Calibration data can be uploaded and downloaded via interface using the “UNIBERT
LB 444” software. Moreover, the software offers a number of data logging functions.
The terminal strip on the instrument rear panel includes all terminals for power supply,
for the detector, and for the analog and digital output signals. The current output is iso-
lated and the built-in relays for max.-min.-indication and for error messages include an
isolated contact.
The system automatically corrects for the decrease of the source activity.
System malfunctions are signalled by error messages.
Calibration data is stored in a FLASH memory and saved, so they will not be lost if power
failure occurs.
3.4.2 Display
The instrument’s illuminated display comprises four lines; the first three lines show the
menu titles, the currently selected parameters or the current measurement value. The
bottom line shows the current function of the respective softkey button. If a measure-
ment is running, the “ run ” status is displayed.
3.4.3 Keypad Function
The Density Meter is operated via the softkeys and function keys described below; with
these keys you can select the operating level you want within a menu structure in order
to select a function or enter parameters.
3.4.4 Softkeys
Softkeys are used to select different menu groups and operating levels within the menu
structure. Depending on the current position in the menu structure, functions are as-
signed to these keys, as shown on the display above the respective key.
3.4.5 Menu Structure
The menu structure is illustrated on the following pages. Push <more> to select the va-
rious menu groups. From there you get to the respective menu by pushing <sk1> or
<sk2> . Within the menu, push <more> to go to the individual windows and at the end
of the menu push <done> to return to the menu group.