BERTHOLD TECHNOLOGIES LB 444 - 10. Service Instructions; 10.1 General Safety Precautions; 10.2 Evaluation Unit LB 444

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10. Service Instructions
10.1 General Safety Precautions
Any time you are working on electrical components, you have to observe the relevant
safety regulations. Please refer to the Safety Summary at the beginning of this operating
manual.
Any work in the direct vicinity of the shielding containing the radioactive source may be
performed only following proper training and/or professional guidance.
10.2 Evaluation Unit LB 444
The evaluation unit is provided with an error control which also monitors the detector
functions. An error code appears on the display if an error is detected. For information
about the error and possible causes please refer to the error code list. In case of hard-
ware errors the evaluation unit has to be replaced.
If no error code is displayed, the electronics is working properly and all measured values
and parameters lie in the normal possible range. Possible function problems must then
have another cause.
“Total Reset” should be performed only in exceptional cases and after consultation with
Berthold.
To perform a “Total Reset”, turn the instrument off; then push the Clear button while
you turn the instrument on.
All entered date will be deleted and the default values restored.
Error code list
No. Problem Cause
1 Rate Overflow Count rate > 520000cps
2 No Detector Rate Error in detector or during transmission
3 Wrong HV HV < 500V or > 1500V, outside control range
6 Detector temperature
> 65°C
Detector temperature has exceeded > 65°C
7 Trouble with detector
communication
Data transfer between detector and evaluation unit faulty
8 Measurement stopped Measurement stopped by closed contact 22 a/c
9 Detector temperature
> 80°C
Detector temperature has exceeded > 80°C
10 Missing calibration Calibration has to be terminated with <enter> and
<more>
11 Power fail > 1 month Instrument has been turned off for more than one
month. Enter new date.
12 No input allowed Device locked by password or wrong password entered
33 Wrong password Wrong password entered
36 Not enough points Not enough calibration points available
37 Not steady Calibration not steady
39 Measuring path not
defined
Measuring path not yet entered
46 Radiating interference New start with <run> or via input 3 (22a/22c)