Pulnix TM-7EX Specifications download pdf (Page 7)

Internal Adjustments

The majority of PULNiX cameras have internal adjust-

ments to enhance the video signal for various applica-

tions. A few of our cameras have some external control

switches available such as the TM-7CN and TM-7EX

cameras.

AGC

Automatic gain control is a feature that is available on all

PULNiX cameras. The AGC adjusts the video level to

various light level conditions. This will not work in

extreme light or dark conditions. This feature can be dis-

abled for various reasons. A common example would be

a machine vision application. Typically in a machine

vision application, the processor part would not like the

video level to keep changing because the processor

would have to compensate for this change. This is not

good, it takes too much valuable processing time. It

would be best to disable the auto gain control and provide

a stable lighting environment around the vision inspection

area. The AGC is disabled internally. When specifying a

camera, make sure the mode of AGC is set to your

requirements. This will save time and money!

Gamma

Gamma is a correction for non-linearity of a picture tube.

What this means is if a camera was to provide a linear

video signal to a picture tube, the output on the picture

tube would not correspond to the linear input. To com-

pensate for this, a gamma correction is made. This is

done inside the camera. This feature can also be dis-

abled. Again, in a vision application, the video signal is

not going directly to a monitor first. The signal will be

input into the vision system which would prefer the linear

signal from the camera and not the gamma-corrected ver-

sion. Once the vision system video signal is sent to a

monitor the gamma correction is already done by the

vision system.

AWB

Auto white balance feature is available on the color cam-

eras only. The auto white balance adjusts the white or

the reference color level. White comprises all primary col-

ors (RGB). By powering up the camera, the AWB is

reset. Also a reset switch is located on the camera.

Sometimes this feature is not needed; can be disabled

and the camera will run on manual white balance. This

will relieve the user from having to reset the white balance

every time the camera is powered up.

Interline Transfer mode selection

The Interline CCD has the ability to transfer its existing

horizontal video information in two ways. This selection of

mode of operation is selectable by an internal jumper

inside the camera.

Frame Mode

The frame mode is the standard interlace mode of hori-

zontal line transfer. For each field, with the odd lines are

first transferred, then the second field when the even lines

of video are transferred. This mode is used for normal

operation and for integration applications.

Field Mode

The field mode of operation works as follows: During

each transfer, two adjacent lines are combined together

and then shifted out. This is used in applications that

involve shuttering, because during shuttering the cameras

sensitivity is reduced due to the reduction of integration

time. When shuttering, by combining the odd and even

lines it will help in the sensitivity being that the line charge

is summed together thus increasing the sensitivity by 2.

Note: From camera model to model the factory settings

may differ. Please refer to the data sheet or call your

Factory Inside Sales person for correct factory specs.

This will save time in the long run. From time to time a

customer has returned a camera for changes in the mode

settings because no one consulted the user on the oper-

ating mode that is required. This communication over-

sight can cost the user money in repair service fees,

shipping costs, and most of all trust in PULNiX and in

PULNiX Resellers.

Intensified CCD Cameras

PULNiX has a variety of intensified cameras. Basically

these cameras are used in very dark conditions. The type

of camera to use would greatly rely on the application it

would be used for. Two types of intensifier camera desig-

nation are the DN type and NV type. The DN (day/night)

cameras have the ability to operate with a MND (motor-

ized neutral density) or equivalent lens in a night to sunny

day environment unattended. The NV (night vision) cam-

eras must be supervised to manually adjust the exposure.

The intensifier tube itself is very sensitive to long expo-

sure from bright scenes. It is possible to burn in an image

and cause permanent damage to the photo sensitive part

of the intensifier. The intensifier is coupled to the camera

in two different methods. One is to use fiberoptic coupling

Picture Tube Output

Camera Face Plate Illumination

Gamma Correction From Camera

gamma= 1/2.2 = 0.4545

Effect of picture tube (non-linear)

(a = 2.2)

Desired linear output

Gamma Correction

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Pulnix TM-7EX Specifications Page 7

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