Hologic QDR 4500 - Technical Specifications: HVL, Voltage, Current, and Deviation

Section 1 - Introduction
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Measured Half Value Layer (HVL) At Different Operating Potentials
Measured operating potential Measured Half Value Layer
QDR4500A/SL
80kV 3.7mm Al equivalent
100kV 4.7mm Al equivalent
140kV 7.2mm Al equivalent
QDR4500C/W
80kV 3.7mm Al equivalent
100kV 5.0mm Al equivalent
140kV 6.5mm Al equivalent
Line Voltage and Maximum Line Current
Power
Requirements:
All
100VAC 16A 50/60Hz, Max apparent resistance = 0.32 ohm
120VAC 14A 50/60Hz, Max apparent resistance = 0.32 ohm
230VAC 8A 50/60Hz, Max apparent resistance = 1.28 ohm
Technique Factors for Maximum Line Current
Peak Potential 140kVp
Tube Current 10mA peak, 50% duty factor or 5mA average.
Maximum Deviation
The maximum deviation from the preindication given by labeled technique factor control settings
or indicators are as follows:
Peak Potential: +/- 15%
Current: +/- 40%
Time : +/- 10%
Measurement Criteria for Technique Factors
The measurement criteria of the technique factors is as follows:
Peak Potential: The voltage peak is measured with an oscilloscope. Voltage is a square pulse.
Peak is defined as the peak voltage of the 4 millisecond pulse shape, not
counting any initial overshoot.
Current: Current is measured with an oscilloscope on the last millisecond of the 4
millisecond pulse.
Time: Time of each pulse is measured with an oscilloscope and defined as the time
between 50% rise and fall times of the peak potential pulse. Time of the scan
is measured by counting the number of AC line pulses from the start to the
end. X-ray pulses are synchronous with the AC line.