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DC X-RAYS
This type of x-ray is typical of the larger x-rays and is multi-phase or 3 phase. A drawing of a typical
waveform is shown below. A very similar waveform is also produced by capacitor discharge x-rays.
These are portable, battery operated x-rays.
Switch the Model 07-453 to MILLISEC. Take the x-ray exposure. The instrument will count and display
the exposure time in milliseconds. For example if the x-ray is set for 2/10 second, the actual exposure
time should be around 200 milliseconds.
It is important to note that the 07-453 will end the count at the end of the x-ray when the intensity drops
below about 70% of the peak value. This is done to ensure an accurate count when there is a "tail" at the
end of the x-ray i.e. the x-ray intensity drops slowly.
If the Model 07-453 is in PULSE mode, and a measurement of a DC or multiphase x-ray is taken the
instrument will count and display 1. This is because the 07-453 detects what is basically one pulse.
Switch the instrument to MILLISEC and take another exposure.
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