Fluke Biomedical 8000 Victoreen - Manual (Page 54)

Victoreen 8000
Operators Manual
2-42
The NERO mAx is now ready to take the next exposure. Position an aluminum absorber in the beam and
make the exposure. If the previously measured exposure is not acceptable, press the reject softkey to
retake the exposure. If an overrange occurs, an error message is displayed and the exposure must be
taken over.
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R
ENTER THICKNESS: 5.00 mmAl EXPOSURE # 02
HVL
MODE THICKNESS REJECT
While the exposure rate from the second exposure is displayed, the user is prompted to enter the
thickness of the aluminum filter. To enter the filter thickness, press the THICKNESS softkey to
increment the filter thickness or use the UP and DOWN keys to increment and decrement the filter
thickness. When the correct filter thickness is displayed, press the ENTER key. If a filter thickness is
repeated, the NERO mAx will ask for confirmation that the latest exposure data is to be accepted.
Pressing the enter key accepts the HVL exposure data after the absorber thickness has been entered.
Pressing the reject key rejects the exposure data and the user is prompted to make the exposure over.
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R
HVL 5.27
mmAl
Please Wait…
HVL CT HIGH 10 mm
MODE CHAMBER SENS BEAM
The HVL is calculated and displayed after the new exposure data has been entered and a “Please wait…”
message is displayed while the NERO mAx prepares for the next exposure. If the NERO mAx displays
“LOW” above the calculated HVL, the average of the added filtration is more than 10% less than the
calculated HVL and more aluminum filtration is needed. If the NERO mAx displays “HIGH” above the
calculated HVL, the added filtration is more than 10% above the calculated HVL and some of the
aluminum filtration should be removed. When more than two exposures have been made, the NERO
mAx checks the HVL data for goodness of fit by calculating its correlation coefficient (“r”), if the fit is poor
(r< 0.98), the “r” value will flash.
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R
HVL 5.27
mmAl
MAKE EXPOSURE # 03
HVL CT HIGH 10 mm
MODE CHAMBER SENS BEAM
The NERO mAx is now ready to take the next exposure. The NERO mAx stays in this measurement
loop until ten exposures have been made or the mode key is pressed, which exits to the mode selection
screen.
As a power saving feature, the NERO mAx’s display backlight turns off after one minute of no activity.
The backlight turns back on when any button is pressed or an exposure is made. In addition, after five
minutes of no activity, the NERO mAx exits from any measurement mode and returns to the mode
selection screen.