Posted by John Adams | @Articles | April 24, 2020, 12:59pm AEST
A: In short, yes. Static could damage an NVR or a DVR. Any static charge that builds up on a tech can be discharged across vulnerable circuits and will blast multiple components on a board and elsewhere. Humans don’t sense static electricity until it reaches 1500 volts, yet a microprocessor on a board can be fried by a measly 10 volts. That means you can damage hardware with static without even knowing it. HDDs are also vulnerable – you can lose everything stored on an HDD with a jolt of static.
What’s amazing is how little movement it takes for the human body to generate major static charges. Just getting up your chair is often enough. A normal static snap might reach voltages of 10kV, while the highest recorded ESD voltages are around 30kV (30,000 volts). What does the damage with ESD is the fast high current waveforms and fast magnetic (H-field) or electrostatic (E-field) disturbances. These can induce voltages or currents in nearby sensitive circuitry, corrupting stored data or causing spurious failures.
The process that causes static in the human body is called triboelectrification and it’s the result of electrons moving between 2 objects that touch. One object – a person – becomes positively charged and when they touch an object that has a neutral or a negative electrical charge, the electrons flow from the positive person to the negative object.
The safest way to handle sensitive electrical components is to wear a grounded anti-static wrist strap. Any static electrical charge that builds up on your body is then immediately transferred to ground. But experienced technicians can also use a few tricks for controlling static electricity.
One trick is to leave the circuit board laying on top of an antistatic bag or antistatic foam whenever possible. Another is to leave a device plugged into an AC outlet with the power switch turned off. This places ground on the metal case. The technician works with one hand always touching a metal part of the case. Any electrical charge that builds up on your body is then immediately transferred to ground.
Bear in mind if you are a 12-volt installer, you shouldn’t be poking around inside the casing of 240V AC hardware.
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Description of and procedure for avoidance of electrostatic discharge.
Electrostatic Discharge is the sudden discharge of static electricity to ground. Sensitive components, such as desktop or notebook disk drives or Solid State Drives, may be damaged if they are in the current path when the discharge occurs. Special precautions should always be taken when handling any device that may be damaged by static electricity.
ESD damage occurs when a charge on a hand or tool finds a path of lesser resistance for itself to a drive. As the current flows to the drive, if the maximum amount of energy that parts of the drive can dissipate is less than the energy of the charge, then damage may occur. In a desktop or notebook disk drive, the small metal foil-like paths in the circuit board, which are made to handle minute amounts of voltage, can be blown apart. If the damage is only partial, the signal which is supposed to go through the path may become intermittent, causing degradation of the signal.
ESD Prevention
Ideally, your drive is shipped in a special bag designed to prevent ESD. Keep the drive in the bag until you are ready to install it, then open the bag by hand or cut the top with a pair of scissors. Never insert a metal tool or knife into the bag and rip it open.
When the drive is installed, put the bag away and do not lose it. If you ever need to ship the drive back or transport it, the bag is your first line of protection from ESD. The bag can also be useful for packing materials. See our Warranty Services page for specific instructions about packing drives.
- Keep your drive in the ESD bag until you need to handle it.
- Always wear an ESD wrist strap (available at most computer or electrical supply stores) grounded to an unpainted surface on the chassis of your computer.
- If a wrist strap is unavailable, touch an unpainted surface on the chassis of your computer before handling your drive.
- Only touch the connector pins on your drive with the proper cabling ends or jumpers. Never use a bare finger or non-insulated tool.
- Protect your drive from sources of high voltage power such as fans or vacuum cleaners.
- Never try to plug a power or data cable into a non-hot-swappable drive unless power to the box is completely off.
At what voltage level can static electricity cause destruction of data stored on hard drives?A4,0001,5004017,000Explanation: Answer B is correct.Destruction of data stored on hard drives can be caused by 1,500 volts of static electricity.BCD
What is the most important goal of all security solutions?This task contains the radio buttons and checkboxes for options. The shortcut keys to performthis task are A to H and alt+1 to alt+9.BCD
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Which level of fences deter casual trespassers?This task contains the radio buttons and checkboxes for options. The shortcut keys to performthis task are A to H and alt+1 to alt+9.BC
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Answer C is incorrect. 6 to 7 feet high fences are too hard to climb and deter most intruders,except determined ones.What type of motion detector senses changes in the electrical or magnetic field surrounding amonitored object?
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ACapacitanceBWaveCPhotoelectricDHeatExplanation: Answer A is correct.A capacitance motion detector senses changes in the electrical or magnetic field surrounding amonitored object.Click to select the steps of the encapsulation/decapsulation process, and then drag them intothe correct order.Here, you have to arrange the options given in the list into their correct order. The shortcut keysto perform this task are. Press the Alt+down arrow key to activate the answer area. Navigate tothe item using the arrow key. Press the Enter key to copy the item. Navigate the copied item tothe desired position using the arrow keys. Press the Enter key to paste the item. If the item is atits correct position, just press the Enter key to keep that item in sequence. If you want toremove the item from its position, press the Delete key for Windows and the Fn+Delete key forMac.Correct AnswerYour AnswerSteps of the encapsulation/decapsulation process1The Application layer creates a message.2The Application layer passes the message to the Presentation layer.3The Presentation layer encapsulates the message by adding information to it.Click to select. Drag and Drop to set sequence.Explanation: Here are the steps of the encapsulation/decapsulation process:The Application layer creates a message.
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