Fluke Biomedical 8000 Victoreen - Manual (Page 34)

Victoreen 8000
Operators Manual
2-22
“Low” is displayed instead of kV (see Section 4.3--Error Messages--for more information). After the
exposure data is displayed, the NERO mAx displays a "Please wait..." message as it prepares for the
next exposure.
89.6
kVp Avg
87.8
kV Eff
4.34
R/min
91.9
kV Peak
4.1
mA
FLUORO CONT HIGH MAKE
MODE TYPE SENS EXPOSURE
The NERO mAx is now ready to take another exposure. Pressing the mode key at any time exits from
this measurement mode and returns to the mode selection screen.
NOTE
The exposure rate displayed after the SAVE key
has been pressed may be slightly different from the
rate displayed before the stop key was pressed.
This is because the exposure rate is calculated
based upon correction factors that are based upon
the measured kVp. In the fluoro mode, kVp is not
measured until after the SAVE key is pressed, so a
constant is used to calculate exposure and rate.
The constant that is used is based upon the
calibration factors corresponding to a kVp average
of the mid point of the selected filter range. After
the SAVE key is pressed, the NERO mAx
calculates the fluoro kVp and applies an exposure
correction factor based upon the calculated kVp.
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.
To make a pulsed fluoro measurement
Make sure that the NERO mAx is turned off. Plug one end of the NERO mAx’s detector cable into the
NERO mAx detector. Plug the other end of the detector cable into the NERO mAx’s detector connector.
Insert the W/Al filter card into the detector and place the filter card in the correct position for the kV range
to be measured. Place the NERO mAx detector on the x-ray table with the top of the detector facing the
x-ray tube. Position the detector so that the detector is centered in the beam and is aligned with the x-ray
tube axis. If mAs measurements are to be made, plug the mAs cable into the NERO mAx detector’s mAs
input and connect the mAs leads to the generators mAs terminals. For more information on positioning
the NERO mAx detector, see section "Positioning the Detector". For mA limits vs. kV, refer to Appendix
B.