General Lab Guideline And Safety Instructions
Following proper safety practices are a must when working with electronic equipment. Not only is there the danger of electrical shock,but the components can explode if not connected properly. Many of today’s electronic components are easily damaged by improper handling.The test equipment used in the electronic service industry is expensive and easily damaged if proper operating procedures are not followed.
- Carry out the experiments in such a way that nobody will be injured or hurt.
- Carry out the experiments in such a way that the equipment will not be damaged or destroyed.
- Follow all written and verbal instructions carefully. If you do not understand the instructions, the handouts and the procedures, ask the instructor or teaching assistant.
- Never work alone! You should be accompanied by your laboratory partner and / or the instructors / teaching assistants all the time.
- Perform only those experiments you find in the instructions or authorized by the instructors.
- Unauthorized experiments are prohibited.
- The workplace has to be tidy before, during and after the experiment.
- Read the handout and procedures before starting the experiments.
- Intentional misconduct will lead to the exclusion from the lab.
- No food or drinks are allowed in the lab.
Electrical safety
The direct impact of electrical current to the human body can cause serious injuries and even death. The strength of injury depends on the amount of current flow, the frequency, the way the current takes through the body and the kind of current (AC or DC). Up to about 0.5mA current flow in the body is imperceptible. Above this a slight tickle is noticeable. Over 10mA there will be muscle contractions in the part of the body, which is flown through by the current. Also respiration problems take place. The hands will not be able to release things. In case of good health this is still not hazardous. For higher currents up to 200mA the duration of the current flow is important. If the current is switched off early enough there is still no effect on health. Rising probability currents over 200mA cause fibrillation, cardiac arrest …etc. Over 500mA the body is also poisoned by chemical effects, which also can cause death even after some days.
In general, DC current is less dangerous but also shows all the described effect at higher values! In practice it's necessary to know the maximum touch voltage, which is surely innocuous. There is no absolute value definable, because the resistance of the human body differs between 600 and about 6000 Ohm. It is dependent upon the wetness of the skin, the individual person and the voltage.With higher voltage the resistance lowers!
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safety
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