DESCRIPTION
The ECC Model 870 mA Meter / mAs/ exposure time meter is specifically designed
to measure x-ray tube current. The ECC Model 870 is a solid-state, digital
instrument designed specifically for service personnel in assessing the performance
of radiation generators. This instrument measures and displays mA, mAs and
exposure time for each x-ray exposure. The instrument is used for dental x-ray
units, radiographic and fluoroscopic x-rays. The operator switches from 2A to 200
mA amp operation simply by switching the switch from left to right.
mA / mAs Measurment Overview
Connect the leads in series with the
ground side of the tube current
Switch the switch to which range
you wish to obtain.
Take an exposure
870 will display and hold mA, mAs,
and exposure time reading
870 is ready for next reading, no
reset is required
When a measurement is being made, the Model 870 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 870 automatically resets at the beginning of each exposure, holding the
reading until the next exposure. There is no need to reset the meter before each
measurement.
This is a new state of the art instrument with many advanced features. For example,
when taking ma / mAs readings, the mA reading is stored and displayed. It is not
necessary to have exposure times long enough to display a reading. This minimizes
unnecessary exposure to test personnel and minimizes heating as well as wear and
tear on the x-ray tube. The Model 870 will display mA, mAs and exposure time for
each x-ray exposure further minimizing the number of x-ray exposures.
The most convenient way of using the 870 for mA, mAs and exposure time
measurements is to plug leads into front of unit and attach the other end, which is
designed to be connected in the ground return line of the high voltage transformer
and must be in the actual current path of the x-ray tube. 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.
