Fluke Biomedical 8000 Victoreen - Manual (Page 70)

Victoreen 8000
Operators Manual
4-8
This error message is displayed if the exposure time, including any measurement delay, is longer than 60
seconds. The fluoro mode may be used for kV measurements when exposure time exceeds 60 seconds.
To measure exposure when exposure time exceeds 60 seconds, the exposure mode should be used.
FILTER CARD IS NOT INSTALLED
The filter card is not installed. This error message is cleared when a filter card is inserted. If this
message persists after the filter card has been installed, verify that the detector cable is connected at
both ends and that the connectors are fully seated.
FILTER CARD IS NOT SEATED
The filter card is not in a valid position. This error message is cleared when the filter card is seated in a
valid position. If this message persists after the filter card has been installed, verify that the detector cable
is connected at both ends and that the connectors are fully seated.
Flashing ‘r’ value in HVL mode
A flashing ‘r’ value in the HVL mode indicates a poor correlation coefficient (r < 0.98) for the data used in
the HVL calculation. The NERO mAx calculates HVL via linear regression of the natural log of the
normalized exposure (normalized to the first exposure) versus absorber thickness in millimeters of
aluminum. To provide an indication of how well the exposure data fits the natural log of the normalized
exposure the NERO mAx calculates the correlation coefficient (‘r’) of the data whenever it calculates HVL.
Poor x-ray exposure reproducibility or errors in absorber thickness will result in a low correlation
coefficient.
HIGH HVL
This message indicates that the average thickness of the HVL absorbers is more than 10% higher than
the calculated HVL. If only two exposures have been made, the added filtration of the second exposure
is more than 10% higher than the calculated HVL. When this message appears, decrease the filtration
used for subsequent exposures until the message disappears. This message is provided to assist in
establishing the optimum HVL filter thickness for a given x-ray beam.
HIGH kVp
The measured kVp (average, effective, or maximum) is more than 10% above the filter’s kV range and
the kV cannot be calculated. To remedy this situation, switch to the next higher filter range. This error
message is automatically cleared when an exposure is made that is within the selected kVp range.
ILLEGAL FILTER SELECTION
The filter card is in the wrong position for the selected measurement mode. This error occurs in the fluoro
or AMSE modes when the filter card is in the CHECK position. This error occurs in the MAMMO mode
when the filter card is in the Moly Target position and the Rhodium target measurement mode has been
selected or when the filter card is in the Rhodium Target position and the Moly target measurement mode
has been selected. This error message is cleared when the filter card is in the correct position for the
selected measurement mode. Verify that the detector cable is connected at both ends and that the
connectors are fully seated.
LOW HVL
This message indicates that the average thickness of the HVL absorbers is less than 90% of the
calculated HVL. If only two exposures have been made, the added filtration of the second exposure is
less than 90% of the calculated HVL. When this message appears, increase the filtration used for
subsequent exposures until the message disappears. This message is provided to assist in establishing
the optimum HVL filter thickness for a given x-ray beam.