Berthold LB 134 - 3.5 Possible Problems during Commissioning; 5.1 Requirements for Contamination Measurements

LB 134 3. Commissioning
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3.5 Possible Problems during Commissioning
The following errors or error messages may be encountered during commissioning:
Error (message)
Cause/Remedy
No message in display
Batteries are exhausted. Replace batteries.
No power supply. Check connection cable.
Target count rate of test sources
not reached
or
Background count rate is too low.
or
Displayed count rate is "0.0 CPS"
Correct detector and possibly check tightness:
o For scint detectors: If detector foil is defective and
light enters, the high voltage turns off, count rate
is zero. Then the device must be turned off.
o For gas-filled contamination detectors: If detector
is OK, the detector foil must be smooth, tense
and plane. A slack, wrinkly foil indicates that the
counter tube is
damaged. Please call Service!
Possibly, HV unit of detector is defective. Replace the de-
tector if the HV unit is defective.
The set background is too high. To check this, push the
Info button to view the gross data.
Connection electronics <--> check probe
INV (only scint detector)
Count rate in alpha channel > 750 cps. Above this count
rate, no meaningful measurement is possible in the beta
channel.
OVF
Measured value above the measuring range
For scint detectors:
Count rate in alpha channel > 5000 cps or
Count rate in beta channel > 50 000 cps.