Fluke Biomedical 8000 Victoreen - Manual (Page 71)

Troubleshooting
Error Messages
4
4-9
LOW kVp
The measured kVp (average, effective, or maximum) is more than 10% below the filter’s kV range and the
kV cannot be calculated. To remedy this situation, switch to the next lower filter range. This error
message is automatically cleared when an exposure is made that is within the selected kVp range.
OFFSET ERROR…# nnnn
A high offset has been measured while preparing for an exposure. The offset error message is followed
by a number that identifies the offset error. Offset errors are listed below:
Offset Error # 0010 - High Ion Chamber Offset
Offset Error # 0020 - High mAs Offset
Offset Error # 0080 - High Channel A Offset
Offset Error # 0100 - High Channel A Offset
Offset Error # 0200 - High Channel B Offset
These offset error messages may be combined to provide multiple offset error messages. For example,
offset error #0030 indicates that excessive offsets exist from both the ion chamber and mAs inputs.
Offset errors will result if the x-ray beam is on while the NERO mAx is preparing to take an exposure.
Make sure that the beam is off when the NERO mAx is preparing to take an exposure.
Offset errors may also occur when the NERO mAx detector is not fully connected to the NERO mAx
readout unit. Verify that the detector cable is connected at both ends and that the connectors are fully
seated.
In the Radio, Mammo, Fluoro and AMSE modes mAs offset errors may be caused by current flowing in
the NERO mAx mAs measurement circuit when no exposure is being made. This occurs when a voltage
exists between the mAs terminals and ground. This may be caused by a ground loop between the mAs
terminals of the generator and another line powered device connected to the NERO mAx such as a
computer, printer or oscilloscope. To remedy this situation, disconnect any line-powered devices from the
NERO mAx or unplug the line-powered devices.
In the exposure, CT exposure and HVL modes, offset error #0010 may be caused by defective external
ion chambers which may be connected to the NERO mAx. If the offset error message goes away when
the external chamber is disconnected from the NERO mAx, the chamber is defective and should be
repaired.
If an offset error message persists, contact Fluke Biomedical at 440248.9300 for assistance.
OVERRANGE ERROR…# nnnn
The NERO mAx has received a signal from its detector that is above its measurement range and
therefore cannot be accurately measured. The overrange error message is followed by a number that
identifies the overrange error. Overrange errors are listed below:
Overrange Error # 0001 - Ion Chamber Overrange
Overrange Error # 0004 - mAs Overrange
Overrange Error # 0010 - Channel A Overrange
Overrange Error # 0020 - Channel B Overrange
These overrange error messages may be combined to provide multiple overrange error messages. For
example, overrange error #0005 indicates that both the ion chamber and mAs inputs experienced an
overrange.