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DESCRIPTION
The ECC Model 815 X-ray kVp Meter / Exposure Time Meter is used to measure
the maximum or peak accelerating voltage output produced by tungsten X-ray
generators. The ECC Model 815 is a solid-state, digital instrument designed
specifically for service personnel in assessing the performance of radiation
generators. This instrument not only samples the acceleration voltage of x-rays,
but measures the length of an exposure. Having both functions in an instrument
simplifies regular constancy checks of kV. The instrument is used for dental x-
ray units, radiographic and fluoroscopic x-rays.
The Model 815 is available with a low range option (Model 815L). See
specifications section for actual range of both models.
The Model 815 can be used to measure the peak acceleration voltage produced
by half-wave, full-wave rectified x-ray machines as well as DC or multiphase x-
rays. It will accurately use ratios produced by different differentially filtered x-ray
detectors to observe kV levels. When the instrument is being used to measure
the length of an exposure, the operator can also determine the characteristics of
an x-ray. After a reading is obtained, pushing the
„Mode‟ button will give the
operator a message indicating if the x-ray is:
1. half-wave, or
2. full-wave, or
3. DC / 3 Phase (constant potential, also for x-rays with more than 3 phase) and,
the exposure time.
When a measurement is being made, the Model 815 has the capability of
automatically determining the type of x-ray that is being measured. It is not
necessary for the user to program correction factors for different types of x-ray
waveforms.
The Model 815 automatically resets at the beginning of each exposure, holding
the reading until the next exposure.
The most convenient way of using the 815 is to place it directly under the x-ray
head. Step back, take the exposure and then observe the reading. Refer to the
section on Operation for information on how to obtain the most accurate
measurements.
Note: With high energy (above 70 kVp) disregard first reading after power on.
It is important that the user be thoroughly familiar with the contents of this
manual before performing any tests on radiation generating equipment
.
It
is also imperative that the user be thoroughly qualified, and familiar with
safety precautions and other practices relating to radiation generators.
