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Model 90100
Operators Manual
2-12
N
O
TE
Figure 2-18. An Absolute Rate Measurement With Air Density Corrections and the Front Panel Gain
Factors Disabled
Prior to making a dose measurement, press the RESET button to zero all ion chamber readings.
Pressing this button has no affect when performing dose rate measurements.
2.4.8.2 Percent-of-Center Measurements
The Percent-of-Center Measurement screen displays the central ion chamber's reading in absolute
measurement units and the four peripheral ion chamber's readings as a percentage of the center ion
chamber's reading.
top
center
x 100%
left
center
x 100%
right
center
x 100%
bottom
center
x 100%
center
units
Figure 2-19. A Percentage Measurement Showing How the Ratios are Calculated
Figure 2-20. A Percentage Dose Measurement With Air Density Corrections and the Front Panel Gain
Factors Enabled
Figure 2-21. A percentage rate measurement with both air density corrections and the front panel
gain factor disabled
Pressing the RESET button while performing a
dose measurement causes all percentages to
immediately change to "UNDER". This is normal
operation (see section 2.4.8.3 for more
information).