4. Measurement Principles & Theory
Display Messages and Active Messages
2014-06/5.5C
81
Piranha & QABrowser Reference Manual
Low Signal
The Piranha detects a signal but it is too low to present a
reliable result.
Increase the mA and/or decrease the distance from X-ray
tube to detector or change the sensitivity for the dose
parameter to High sensitivity or even Very High
sensitivity. Also the kV sensitivity can be changed. You
find these settings if you tap the
symbol.
Reposition Detector
The radiation signal on D2 and D1 is not within 5 % (quota
not between 0.95 to 1.05). The most common reason for this
is that the detector area is only partially irradiated, the
detector is tilted, or the filtration differs between D2 and D1
(e.g. heel effect).
Change the field size or move the detector into the central
beam.
Negative Signal
The electrometer module detects a negative signal.
Most common is that the mAs-probe have been
connected in the opposite direction on the HV cable.
Change the polarity of the current probe.
Also small negative drift created from the detector source,
typically initially after reset can give this message.
Do a Reset to clear the message.
This message does not appear in the Timed and Free run update modes.
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