Fluke 90100 manual Using the Measure Select Button Normal Mode, Absolute Measurements

Operation

Operation Instructions 2

NOTE

The FPGF for the center ion chamber is displayed on the bottom line of the VFD.

Use the UP and DOWN buttons to toggle the FPG annunciator on or off. The FPG annunciator in the upper right-hand corner of the display signifies that FPG corrections are enabled, see Figure 2-15. When the FPG annunciator appears, the 35360A TRACKER Display multiplies each ion chamber's exposure value by its FPGF before displaying the reading. See section 2.4.10 for information on how to set the front panel gain factors.

2.4.8 Using the MEASURE SELECT Button (Normal Mode)

Press the MEASURE SELECT to display the Measurement screen. The 35360A TRACKER Display can present the measurement data in an absolute form, or as a percentage of the center ion chamber. While the Measurement screen is displayed, press the MEASURE SELECT button to toggle the display mode between the percentage-of-center and absolute presentations.

2.4.8.1 Absolute Measurements

Figure 2-15 shows the ion chamber layout for the Measurement screen in the absolute display mode. The 35360A TRACKER Display displays the four outside ion chamber readings in a diamond pattern above the center channel. All five readings are in the selected units ("rads" in this case).

	top
left	right
	bottom
	center units
Figure 2-16.	Measurement Screen Showing the Ion Chamber Layout
		NOTE
	The measurement value corresponding to the
	central ion chamber is always displayed on the
	bottom line of the VFD.

Figure 2-17. An Absolute Dose Measurement With Air Density Corrections and the Front Panel Gain Factors Enabled

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