4
GENERAL INSTRUCTIONS
SWITCH SETTINGS
In order to keep operation easy and straightforward there are only two switches
on the front panel.
ON/OFF SWITCH
The ON/OFF Switch is used to turn on the instrument. The switch is illuminated,
and the green light will be
on
when the power is turned
on
. Remember to turn
the instrument off when not in use to conserve the batteries.
MODE SWITCH
The MODE SWITCH has two functions.
1. When initially turned on, the instrument can be switched to the
“High
Resolution” mode.
2. After a kVp reading is obtained, pushing the Mode Switch will provide
additional information.
1. High Resolution / High Speed Modes
When the instrument is first powered on, it
is in “Normal” or “High Speed Mode”
which is used for most measurements. When used in Normal Mode the Model
815 inserts a delay of about 22 milliseconds before measuring the kVp. Pushing
the button once will put the instrument into
“High Resolution Mode”. In High
Resolution Mode, the delay is approximately doubled.
When using the
instrument in High Speed Mode, the x-ray exposure time must set to at
least 40 ms (0.04 sec). When using the instrument in High Resolution
Mode, the exposure must be at least 80 ms (0.08 sec).
When the instrument is put into High Resolution Mode, it will stay in High
Resolution Mode until it is turned off. To get the instrument into High Speed or
Normal mode, turn the power off and then on. There is additional information
about using High Resolution Mode in the Operation section.
2. Additional Information Display
After a measurement, the kVp value will be displayed. Additional information can
be displayed by pushing the mode button momentarily. The instrument will then
sequence through the following information:
• Waveform Type
• Exposure Time in milliseconds
And back to kVp.
Waveform type and exposure time will each be displayed for about 1.2 seconds,
and then the display will revert back to kVp. After the Additional Information is
displayed and display returns to kVp, the meter is ready for another reading. If
the battery is low,
a „Batt Low‟ message will also appear for 1.2 seconds.
