Problems often encountered in the examination of medical electrocardiogram machine

Electrocardiogram machine is a very important medical measurement tool, it can help us quickly find patients with heart diseases, in the hospital preventive physical examination and disease diagnosis work has played a very important role. We must check it regularly to ensure that its data is accurate and reliable in good operation. Many problems may be found in the check process of medical electrocardiogram ‍. Today we classify and summarize the problems often encountered in actual verification.

1. The whole machine does not work

The machine can not run is one of the common faults of electrocardiogram machine. The main manifestation is no response or normal indicator but no other response can not be used for ecg monitoring. In these two states, the electrocardiogram machine can not carry out metrological verification and verification normally. There are many reasons for not working, and we need to work on a case-by-case basis.

2. Power supply problem

According to the rules of digital electrocardiogram machine, first of all, its appearance and normal work should be examined. Ecg machine should be marked on the manufacturer's factory number model, rated voltage and frequency of power supply, and then check whether the body of the machine is not obstructed by the normal operation of mechanical damage button is normal operation, screen display is normal switch is accurate positioning accessories are complete and there are corresponding instructions. The key is to check whether the machine can run normally. Sometimes the machine indicator light is not bright, which leads to the verification work can not be opened. In this case, the general consideration is to check the power supply line.

3. Amplitudefrequency characteristics

The output amplitude of the electrocardiogram and the receiving frequency of the signal are one to one, which need to be corrected according to the standard in the verification. The verification stipulates that the amplitude values of the three frequencies of 5Hz-1Hz and 0.5Hz at the speed of 25mm/s and the waveform amplitude values of the three frequencies of 30HZ-60Hz and 75Hz at the speed of 50mm/s should be corresponding to the output amplitude. The standard error range is -10% ~ +5%. However, in the verification, it was found that the three frequency waveforms at the speed of 50mm/s gradually weakened, especially the amplitude of the 75Hz frequency waveform was seriously beyond the allowable error range.

We must also check the appearance and normal use of the medical electrocardiogram ‍ regularly, including the measurement of square wave signal amplitude, the measurement of damping adjustment voltage and a series of commonly used parameters such as sensitivity amplitudefrequency characteristics. In the verification we need to pay attention to the first cover the inner and outer layer of the shielding box to correct. All lead wires should be put into the inner shielding box and cover the shielding box.Monitor manufacturer, EEG machine, Meilun