This thesis presents the development of a device for the input control of solenoid
valves KSV15C used in medical diagnostic devices. The device performs test procedure
to check whether they are suitabile for use in the final product and, if so,
in which product they will be incorporated. We developed a conceptual design
based on the requirements and specifications, which are largely derived from the
testing process and the shortcomings of the previous device. With the concept in
mind, we designed and assembled the printed circuit board and installed it with
other components into the case. We wrote the software for the execution of the
test procedure and the subsequent processing of the data on the computer. We
tested the operation of the device with a test sample of 30 valves (half of which
were new). We evaluated the repeatability of the measurement on each channel of
the new device, where we determined the standard deviation of each channel by
measuring one valve on the same channel 25 times. Channel 3 had the lowest -
2,59 mmHg and channel 1 the highest - 4,16 mmHg. Each valve was also tested
with the old device and on all channels of the new device. Based on the results
of the testing, we classified the valves into three categories. The channel with the
smallest standard deviation was compared to the old device. Category matched
in 80%, although the variation in mmHg is significant. On average, higher deviations
occurred in the measurement results with higher values of valve leakage (in
measurement where the valve was partially open). When comparing the channels
of the new device, 23 valves were classified in the same category on all channels,
two valves had a different classification on one channel and the other valves had a
larger deviation. All valves passed the usability test.
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