Fluke Biomedical 07-492 - Manual (Page 10)

Nuclear Associates 07-492
Operators Manual
2-2
exposure. To improve accuracy, the user should either increase distance or decrease the mA, both of
which will reduce the beam intensity.
A low mAs condition indicates that the exposure is less than the required value to make a measurement.
The user should either increase time or mA or decrease distance for the particular kVp setting. Refer to
Section 3, Battery Installation and Setup, for a discussion of minimum mAs requirements.
The auto reset on the front panel will turn on whenever the kVp meter detects an x-ray exposure. The
LED will remain lit for 0.5 seconds or for the duration of the exposure, whichever is greater. The previous
reading is cleared when the LED lights.
2.3 Switches
The power switch is located on the front panel. The power switch is used to turn the unit on or off. A
phase switch is located on the rear panel which allows selection for single phase and three phase
applications.
2.4 Top Panel
The top panel of the kVp meter contains the following information:
• A brief set of operating instructions.
• An indication as to where to center the beam, referred to as the target.
• Display guide for A, B, C, and D decimal point indications as discussed above.
2.5 Rear Panel
The battery access panel and a BNC connector are located on the rear panel. Refer to Section 3, Battery
Installation and Setup, for battery replacement procedures. The BNC connector allows the user to
connect an oscilloscope to the kVp meter to view the signal from the radiation detection diodes. The
signal can be observed on the oscilloscope for the duration of the exposure. A storage scope or camera
is necessary to view the signal for extended periods of time.
The phase selector switch is also located on the rear panel of the kVp meter. The switch has two
positions, one phase and three phase; position is determined by the type of x-ray machine being tested.