Fluke Biomedical 8000 Victoreen - Manual (Page 48)

Victoreen 8000
Operators Manual
2-36
183
mR
Enter Thickness: 030 mmAl EXPOSURE # 02
HVL
MODE THICKNESS REJECT
The exposure data from the second exposure is now displayed and 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. If a filter thickness is repeated, the NERO mAx will ask for confirmation that the latest
exposure data is to be accepted. When the correct filter thickness is displayed, press the ENTER key.
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.
183
mR
HVL 0.27
mmAl
Please Wait…
HVL MAMMO INTEG
HIGH
MODE CHAMBER MODE SENS
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.
183
mR
HVL 0.27
mmAl
MAKE EXPOSURE # 03
HVL MAMMO INTEG
HIGH
MODE CHAMBER MODE SENS
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.