Berthold LB 442, Руководство по эксплуатации

Страница: 91 / 158

Section 11 Service Instructions
89
Section 11 Service Instructions
11.1 General Safety Precautions
Any time you are working on electrical components, you have to
observe the relevant safety regulations. Please refer to the GEN-
ERAL WARNINGS and SPECIFIC WARNINGS in the Safety Sum-
mary.
Any work in the direct vicinity of the shieldings containing
the radioactive source may be performed only following
proper training and/or professional guidance. Please see
SPECIFIC CAUTIONS in the Safety Summary.
11.2 Trouble Shooting
Problem Possible Cause Potential Solution
No display No power supply Check mains cables
Check fuses
Display unreadable Processor error Note error code
Perform total reset
Replace evaluation unit
No pulse rate
(Error code 2)
Power supply for detec-
tor interrupted
Check cable to detector
Detector is faulty Replace detector
Pulse rate too low Shielding not open or
not properly opened
Check lock and secure it in position
OPEN
Alignment of useful
beam toward detector
not correct
Correct and optimize alignment
Source has reached the
end of its service life
Renew source (Co-60 after 5 to 10
years, at the earliest)
No or incorrect re-
sult reading
Entry of calibration val-
ues incorrect
Check calibration values
Output current in-
correct
Entry of calibration val-
ues incorrect
Check calibration values
Result reading fluc-
tuates strongly
Time constant too small Increase time constant in the
Measuring Parameter menu (min
20 s)
Pulse rate too low Check age of source and irradiation
level. Replace detector
Result reading
shows drifts
Detector stabilization
faulty
Replace detector
Photomultiplier faulty Replace photomultiplier