Fluke TRACKERTM 90100 - Manual (Page 21)

Operation
Operation Instructions
2
2-9
Figure 2-9. Test/Detector Screen 2 - Ion Chamber Calibration Factors
Figure 2-10. Test/Detector Screen 3 - Bias and Battery Voltages Plus an Option Text Line
In Figure 2-10, the battery current, "+0.1 A", is displayed to the right of the battery voltage, "6.8 V". A
positive current value of up to 2.5 amperes indicates that the battery is being charged from the AC line.
As the battery approaches full charge, this current will decrease to near zero. A negative current value
will be shown when the instrument is operated from battery power, and indicates the actual current
consumption of the instrument.
The battery voltage number displayed is the terminal voltage of the battery. During a charging cycle, the
voltage can be anywhere from 5.5 volts to 8.5 volts. After the battery reaches its full charge, the charging
circuit switches to trickle charge mode with a corresponding terminal voltage of approximately 7 volts.
The unit will remain in this trickle charge mode as long as the instrument is attached to an AC line. When
the instrument is operated with battery power, the voltage will read between 6.5 volts (battery fully
charged) and 5.4 volts (low battery shutdown voltage).
2.4.5 Using the UNITS SELECT Button
Pressing the UNITS SELECT button displays the Units Select screen, see Figure 2-11. The "X" cursor
points to the currently selected measurement unit. Press the UNITS SELECT button to toggle the "X"
cursor between the dose and dose rate measurement units.
Figure 2-11. The Units Select Screen with Dose Measurement Units Selected
The Display Units Conversion Factor (DUCF) is displayed at the bottom of the Units Select screen. The
35360A TRACKER Display uses the DUCF to convert from the detector calibration units to the display
units selected during the customization process (see Section 5).