Protection Classification IP 66?

The protection classification offered by an enclosure is shown by the letter IP (Ingress Protection) and two digits.

The first digit indicates two factors:

1. Protection for persons

2. Protection for equipment

The second digit indicates the protection against water.

First digit: 6

Protection for persons: Protection against a wire touching dangerous parts.
Definition: A body 1,0 mm in diameter must not be able to enter.
Test conditions: The accessing probe is pushed against every opening of the enclosure with a standardised force or is inserted through the opening.
Conditions for acceptance: The protection is satisfactory if a sufficient distance between the accessing probe and dangerous parts is kept.
Protection for equipment: Sealed against dust
Definition: Dust must not enter at all.
Test conditions: The test is carried out in a dust chamber in which talcum powder is being kept suspended in the air by means of a dust distributor or similar device. The enclosure which is being tested is placed in the test chamber while a vacuum pump keeps the pressure in the enclosure below the atmospheric pressure of the environment according to the standard.
Conditions for acceptance: The protection is satisfactory if there is no visible dust deposit within the enclosure after completion of the test.

Second digit: 6

Protection against water : Protection against powerful water jet.
Definition: A strong water jet directed at the enclosure from any direction must not have any harmful effects.
Test conditions: A jet nozzle with an inside diameter of 12.5 mm splashes a volume flow of 100 litres per minute from a distance of 2.5 – 3 metres from all sides onto the enclosure. The test time is 3 minutes.
Conditions for acceptance: Should water have penetrated, it must not

– be present in quantities which impair the good working order of the operating material or represent a safety hazard;

– deposit on non-conducting parts where it could lead to creep currents;

– come in contact with live parts or coils which are unsuitable for operating in wet conditions;

– collect near the wire end or possibly penetrate the wire.

Important note: The protection classifications given for the enclosures refer to unmachined standard enclosures as supplied. As the tests to show protection classifications take no account of ageing, the maintenance of the protection classification throughout the lifetime of the equipment is not guaranteed.

What is “Lux” for cameras?

LUX is defined as “Relative amount of light that will produce a viewable image.” A unit measuring the intensity of light. Full moon light is about 0.1 lux whereas full daylight is about 10,000 lux. Most color cameras can produce decent images during deep twilight. Most black and white cameras need about as much light as produced by a full moon. With our new HAD and Super HAD CCD cameras, the only light you need is starlight on a dark night.

What is Automatica Gain Control(AGC)?

Most cameras come with an AGC circuit. This circuit examines brightness level of the video signal to keep it at a consistent level. For example, if the video signal is dark, it will attempt to increase the gain to bring the brightness up to a normal level.

What is an Auto Iris Lens?

An automatic iris lens is a lens with a motorized iris that automatically adjusts to only allow a specific amount of light to reach the image sensor. When there is too much light, the iris will close to reduce the amount of light let in. Auto iris lenses are primarily used in applications where light levels vary and it would be impracticable to manually adjust the lens. Automatic iris lenses are generally more efficient than the electronic shutter since they actually control the amount of light reaching the sensor as opposed to simply adjusting the shutter speed.

What is the camera format?

Refers to the size of the imaging sensor. Common formats are 1/4″, 1/2″, 1/3″, 2/3″, and 1″.

The size of the sensor directly affects the field of view obtained. When using the same size lens on different format sensors, different viewing areas are obtained. For example, using a 6 mm lens on a 1/3″ sensor will give you a 37 degree field of view. Using the same lens on a 1/2″ sensor will increase the field of view to 56 degrees and 74 degrees on a 2/3″ sensor.

It is important to make sure you have a lens that was designed for at least the size of your sensor. For instance, you can use a 1″ format sensor on a 1/3″ camera, but you cannot use a 1/3″ lens on a 1″ camera.

If you use a lens designed for a smaller format camera, the image will be vignetted. Also, by using a lens designed for a larger format sensor, the field of view will be greater than what is specified.

What is the Depth of Field?

The depth of field (DOF) is the portion of a scene that appears sharp in the image. A large DOF leads to a large area in the Field of View being in focus, while a small DOF means only a small section of the Field of View are in Focus.

What is the F Stop?

In photography, stops are also a unit used to quantify ratios of light or exposure, with one stop meaning a factor of two, or one-half. The one-stop unit is also known as the EV (exposure value) unit. On a camera, the f-number is usually adjusted in discrete steps, known as f-stops. Each “stop” is marked with its corresponding f-number, and represents a halving of the light intensity from the previous stop.