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Menu Structure Volume 3
2.38 HV SETTINGS
1 HV SETUP (only for test purposes)
Enter a fixed HV between 300 and 1300V.
Reset the value to “0” as soon as the test is finished. Otherwise,
false measured value may be displayed.
2 HV DEFAULT
This value is defaulted by BERTHOLD TECHNOLOGIES and has to
be set new only after replacement of the detector or the multiplier.
After power failure, the Uni-Probe starts with this HV. Thus, the
Uni-Probe quickly adjusts to the operating point. This is important
especially for rod detectors, which otherwise would need approx.
30 minutes for adjustment of the HV.
Explanations The HV default value also reduces the available HV range in the HV
auto mode from -20% to +40% of the HV default values. This pre-
vents the HV from deviating too far from the plateau even if the
control should fail.
Example HV Default is set to 700V.
In this case the HV does not exceed 980V and does not drop below
560V.
If you have entered a HV default value of “0”, th e r e duced H V-
range is not active, a range from 300V to 1300V is valid. In this
case the start value is always “0V”.
Following a
RESET (factory settings), the HV default value will be
used.
After replacement of the scintillator or multiplier you have to deter-
mine the new value. This is done by transferring the self-adjusted
HV value to the HV Default. A rod detector needs 30 minutes to
adjust and a point detector 5 minutes after power on.
3 HV READING
Shows the current HV.
4 HV MODE
Shows the current HV operating mode.
The auto mode controls the HV and thus compensates for sensitiv-
ity variations due to temperature and ageing of the Uni-Probe.
If the value in HV Setup = “0”, the HV mode is on auto.
If you set a value between 300 and 1300V in the HV Setup, the HV
modes is set to manual.
Following a RESET (factory settings), the HV mode is set to Auto.
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