Fluke Biomedical 07-492 - Manual (Page 9)

Indicators and Controls
Front Panel
2
2-1
Section 2
Indicators and Controls
2.1 Front Panel
See Figure 2-1 for front panel control and indicator location.
2.2 Numeric Readout
The front panel 3 ½ numeric digit LCD readout displays the measurement data. Also indicated on the
display are low battery, overrange kVp, underrange kVp, high mAs, and low mAs conditions as listed in
Table 2-1.
Table 2-1. Displayed Indications
Condition Indication
Low Battery LO BAT in the upper left corner of the display.
Overrange kVp Flashing decimal point directly above A.
Underrange kVp Flashing decimal point directly above B.
High mAs Flashing decimal point directly above C/D and a non-zero numeric display.
Low mAs
Flashing decimal point directly above C/D and a display numerically equal to
zero.
Figure 1-1. Front Panel Indicators and Controls
An overrange kVp condition indicates that the measured kVp is above the calibrated range. An
underrange kVp condition indicates that the measured kVp is below the calibrated range.
A high mAs condition indicates that the beam intensity is too high and the measurement is completed with
less than 50 ms of the radiation waveform. The resulting measurements may be less accurate than those
obtained with longer sample times. This is especially true in the case of single-phase x-ray machines
where the radiation spectrum changes dramatically throughout the duration of a pulse. For example, if
the measured waveform contains less than six pulses of single-phase rectification, then a partial pulse
can have a significant contribution to the value of the average of the pulses. The effect is not as great for
three phase machines because the radiation spectrum remains relatively constant throughout the