Berthold LB 444 - Evaluation Unit LB 444; General Description; Figure 8: Front Panel LB 444

Density Meter LB 444 SECTION 2. SYSTEM DESCRIPTION
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Evaluation Unit LB 444
2.4.1.3 General Description
The evaluation electronics is designed as a 19" module in the format 3 HE, 21
TE. It includes the microprocessor-controlled evaluation electronics and the
power supply. A 32-bit microprocessor with menu-structured software specially
designed for density measurements is used for signal processing.
The six foil keys on the front panel are used to operate the instrument.
• Three keys work as soft-keys which allow user-guided definition of all in-
strument settings and input of the required parameters.
• Three more keys serve as function keys.
The illuminated display field on the front panel shows the relevant instrument
function on four lines. The front panel also includes an RS 232 interface.
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BERTHOLD
Softkeys
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EG&G Berthold
LB 444 V 1.00
Density - Meter
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Figure 8: Front Panel LB 444
The terminal strip on the instrument rear panel includes all terminals for power
for the detector and for the analog and digital output signals. The current output
is isolated 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 source activity with age.
System malfunctions are signaled by error messages.
The calibration data is stored in a FLASH memory and saved during loss of
power.