Important CCTV Operator Interview Preparation Guide

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first a fall you use multimiter and set on contunity mode and one side (start side) wire twisted in all power cable inside 3+1 cable and go another side (End side) of wire and test with multimiter.

An AC current that can be produced in a cable. This is usually caused by parts of the system being fed from different electrical sources resulting in different earth potentials at each end. The result is interference on the signal, usually in the form of dark bands across the monitor and on occasion tearing in the top third of the image.

Prepare an answer that emphasizes the skills and requirements outlines in the job listing. Match your abilities to the company’s needs and goals, and focus your reply on what makes you stand out from the competition.

Only lighting within the visible wavelength should be used with color cameras. Tungsten Halogen is often the recommended source of lighting.

As a security guard, you’ll have to use the software associated with CCTV cameras. If you have experience using CCTV equipment, say so. Otherwise, demonstrate computer literacy and an ability and willingness to learn to use new systems.

The correct size monitor is dependent on its use e.g. the number of images to be displayed at any given time, the viewing distance and the available space.

In general the answer is yes. Most manufacturers will recommend the use of such power supplies as standard with their equipment. You should always consult the manufacturer’s specifications prior to the connection of any power supply.

The correct level is 1 volt peak to peak. This can only be accurately set either with an oscilloscope or with a video level meter.

This is usually performed by a simple plug-in connection to the rear or side of the camera. However you should always refer to the relevant camera handbook.

Lack of power, broken or damaged internal wires, corroded connectors or improperly assembled connectors can likely cause this to happen. The best recourse is to troubleshoot and find out the exact cause of the problem to repair as needed.

This can be achieved in a number of ways, the easiest of which is the installation of a Ground Loop Isolation Transformer. This is best installed at the monitor or recording end of the system.

A general rule of thumb is only to use a MI lens in an internal application. This is because you are reliant on the electronic circuitry of the camera compensating for light changes in the scene and this is not able to compensate to the same degree as that of an Auto Iris lens.

☛ An Auto Iris lens is one that automatically adjusts its iris for changes in the scene lighting levels. The motor that opens and closes the iris is driven by an Amplifier that processes a small electronic signal changing with the light level.
☛ A Direct Drive 'DD' lens does not have this Amplifier and can only operate with a camera fitted with one.
☛ A camera specification will indicate the available output options.

Turn off the ‘Auto Panning’ feature on your device and see if it solves the problem. If not, the unit itself could be at fault that will need to be replaced.

This is a commonly asked question and there is no simple answer. Some manufacturers may recommend that their cameras can be run over (X) distance with (Y) cable. This however should still be considered as a general guide. Cable conductor size and installation route must also be taken into consideration. If you are unsure, we would recommend that you contact Technical Support for guidance.

The DVR Board only capture video signal but doesn't compress it, it is the computer CPU and RAM to do this compression work. It's high cost of CPU and RAM resources. In this system the computer CPU and RAM are often overloaded. It is easier to crash than hardware compression system.

First, check if the device has a BNC connector and the CCTV uses an RCA input. If so, connect the BNC cable to the RCA jack on the monitor; otherwise, plug the RCA camera to the BNC input. Then, push the ‘Source’ button on the remote control to select the input ‘Composite’ on the TV. Finally, make sure there is power to the camera to see the video.

This is achieved by following five simple steps:

☛ Set the physical focus of the lens to infinity (clockwise from the front).
☛ Aim the camera at the subject to be viewed.
☛ Release the camera back focus mechanism.
☛ Adjust the back focus to obtain the best possible picture.
☛ Secure the cameras back focus mechanism.

Camera housings come in various shapes and sizes. With regard to the correct IP rating protection, this will range from dust and water ingress. This system is governed by a number of European and British standards.

IP55:
☛ Protected against dust - limited ingress.
☛ Protection against low-pressure jets of water from all directions - limited ingress permitted.

IP655:
☛ Protection against low pressure jets of water from all directions - limited ingress Permitted.

If you don’t have prior experience in security, talk about how you used team-based problem-solving in some other type of position.

☛ Connect the red wire to red and the white wire to the black wire of the camera.
☛ Make sure the red and white wires are positive and negative.
☛ Then, insert the solid or center copper wire of the RG59 to the unit’s yellow video line.
☛ Finally, connect the braided shield of the RG59 to the black ground wire of the camera.

When setting the back focus of a Color camera for low light conditions you should place an ND1 (Neutral Density) filter in front of the lens. When setting the back focus of a Mono camera for low light conditions you should place an ND3 (Neutral Density) filter in front of the lens. When setting the back focus of a Mono camera fitted with I/R lighting for low light conditions you should place an IRP (Infra- Red Pass) filter in front of the lens.

The choice is wide and varied dependent on the system requirements. You may require Top mount, Side mount, 230V AC or 24V DC to name just a few.

TOP MOUNT:
☛ Pro: Can fit two IR lamps on the side of the Pan/Tilt. These act as a counter balance enabling you to use a lighter duty Pan/Tilt head.
☛ Pro: Compact size.
☛ Con: Restricted tilt often -45 to 0 dependent on the housing fitted.
☛ Con: Cannot be inverted.

SIDE MOUNT:
☛ Pro: Can be inverted.
☛ Pro: Often cheaper.
☛ Pro: Large tilt often +or- 180
☛ Con: Difficult to mount IR lamps.
☛ Con: Generally large size.

This question is focused on your ability to encounter anger without becoming emotionally triggered yourself and without resorting to violence. A successful outcome in this context involves pacifying the angry person and resolving the situation. If you’ve ever worked in any kind of customer service role, you’ll have something to share. Just remember to focus on the outcome and what it says about your skills and abilities, rather than getting bogged down in telling a funny (or horrifying) story.

☛ Examine these 2 pictures of 2 different people for a couple of seconds. Then, put the photographs down, and describe those 2 people to me.
☛ Tell us about how you have worked in a team to solve a problem in a former security job?
☛ If you witness an attack, how would you handle the situation?
☛ Tell us about a time when you successfully dealt with an aggressive customer without using physical force, describe what words and gestures you used to defuse the situation?
☛ How do you feel about using computers, do you use one at home if so what for?
☛ Are you currently First Aid trained and certified?
☛ Describe a time on the job when you felt as if you were about to be physically attacked. How did you handle the situation?
☛ If you found out a fellow security officer was perusing information he/she shouldn’t be, but in your opinion the information wasn’t that important anyway, what would you do?
☛ If you are working at an event where there is a large and disorderly crowd, what measures could you take to make sure the event does not become too unruly or hazardous?
☛ Imagine you have been called to handle an emergency on the 12th floor of a building, but eight guests are waiting to be checked in at the front desk. It’s late at night and you are alone at the front desk. How would you deal with the situation?