BERTHOLD TECHNOLOGIES Uni-Probe LB 490 - Page 475

Uni-Probe LB 490
BERTHOLD TECHNOLOGIES GmbH & Co. KG
5 – 475
Volume 5 4 Menu Overview
5
 Enter the parameters in the text boxes of the HV SETTINGS dia-
log box and upload the settings to the Uni-Probe by clicking on
TRANSFER.
IMPORTANT
Parameter changes in this online dialog become effective immedi-
ately (no upload to the device required).
Parameters Description
HV Reading Shows the current HV.
HV Mode The auto mode controls the HV and thus compensates for sensitivity vari-
ations due to temperature and ageing of the Uni-Probe.
If the HV value = 0, the HV mode is on Auto. If you set a value between
300 and 1300 V in the HV READING text box, then the HV mode is set to
Manual.
Following a RESET (factory settings), the HV mode is set to auto.
HV Setup (Only for test purposes)
Enter a fixed HV between 300 and 1300V.
IMPORTANT
Reset the value to “0” as soon as the test is finished.
HV Default This value is defaulted by the manufacturer 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 oth-
erwise would need approx. 30 minutes for adjustment of the HV.
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 prevents 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”, the reduced HV-range is not
active, a range from 300V to 1300V is valid. In this case the start value is
always “0V”.
If you restore the factory settings, the detector code will be retained.
After replacement of the scintillator or multiplier you have to determine
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.