Fluke Biomedical 8000 Victoreen - Manual (Page 72)

Victoreen 8000
Operators Manual
4-10
Radio, Mammo, Fluoro and AMSE modes
If an overrange occurs on channels A or B when using high sensitivity, switch to low sensitivity. If using
low sensitivity, switch to the next higher filter range (if the kV is within that range), decrease mA or
increase the distance between the detector and the x-ray tube.
If an ion chamber overrange occurs, decrease mA or increase the distance between the detector and the
x-ray tube.
If an mA or mAs overrange occurs, the tube current is above the measurement limit of the NERO mAx.
This overrange may also be caused by excessive voltage between the generator’s 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. Verify that the mAs leads are properly connected in the ground return of the high
voltage transformer and that the set mA is within the measurement limits of the NERO mAx (1000 mA).
Exposure, CT Exposure and HVL modes
If an ion chamber overrange occurs when using high sensitivity, switch to low sensitivity. If using low
sensitivity, the exposure rate is too high, decrease mA or increase the distance between the ion chamber
and the x-ray tube.
PRINTER ERROR
The printer may be out of paper, off line or not connected. If printing is to be used, verify that the printer
is connected to the NERO mAx, that it is turned on and is on line and that it is not out of paper then press
any key to continue. If a printer is not in use, turn printing off by going to the setup mode and turning print
off.
RAD TOO LOW
This error occurs when most of an exposure is below the NERO mAx's detectability limit. Under these
conditions, there may be a few data points above the NERO mAx's detectability limit but there is
insufficient data to accurately calculate the average, effective or maximum kV. Increasing the x-ray
intensity at the detector by increasing mA or decreasing the source to detector distance will alleviate this
error condition.
RS232 TIMED OUT
This error occurs when a device connected to the NERO mAx RS-232 port is not accepting data. This
may happen when a computer connected to the RS-232 port is off or is powering up when the NERO
mAx is preparing to take an exposure. This may also happen when using the NERO mAx Excel Add-In
with slower computers. To continue making measurements, press any key.
TABLE CHECKSUM ERROR
An error has been detected in the kV calibration coefficients that have been stored in the NERO mAx for
the filter that is presently in use. The NERO mAx cannot be used for measurements with this filter and
must be returned to Fluke Biomedical for repair. Please contact Fluke Biomedical at 440.248.9300 for
assistance.
WRONG FILTER CARD FOR THIS MODE
The incorrect filter card for the selected measurement mode has been inserted in the detector. This error
is caused by attempting to use the W/Al filter card for mammo measurements or attempting to use the
MAMMO filter card for radio, fluoro or AMSE measurements. This error message is cleared when the
correct filter card is inserted for the selected measurement mode. If this message persists after the
correct filter card has been installed, verify that the detector cable is connected at both ends and that the
connectors are fully seated.