Siemens 7MC3040-..., Руководство по эксплуатации, Страница: 40 / 116

s
Operating manual PA
32

Exposure control only applies to the measurement area. (
C.TBC
=
on)

Exposure control applies to the entire field of view. (
C.TBC
= off)
As a standard, the target brightness control feature works in the target
area to show bright objects against a dark background or dark objects
against a bright background with an ideal brightness.
White Balance
White balance basically means colour balance. It is a function which
gives the camera a reference to "true white"
— it tells the video camera
what the colour white looks like, so the camera will record it correctly.
Since white light is the sum of all other colours, the camera will then dis-
play all colours correctly. If the video camera does not find a neutral ref-
erence, it might produce an image with a colour imbalance. (setting
C.COL
=
„Automatic“).
The video camera can compensate for ambient illumination conditions.
The camera’s light sensitivity adapts dynamically to the brightness of the
actual target object captured within the rectangular measurement area.
The user can manually select the colour temperature of the light source.
In that case the video camera will not perform automatic white balance
(
C.COL
=
DAYL
daylight).
Superimposed Temperature Reading
The current temperature reading can be superimposed on the video
camera’s image. Use the setting
C.OVL.
to select or deselect this func-
tion.
7.4 Simulate current signals for analogue output Ao1 and Ao2
(configuration layer:
C 100
)
PA pyrometer features a function to simulate a temperature reading. This
is especially useful after initial setup to verify that temperature data is
correctly transmitted to the controller. Use the push-buttons on the py-
rometer rear panel to simulate a temperature reading, which is applied
as an output current signal scaled to the selected current range. The ap-
propriate parameter can be accessed via configuration layer
C100
. If
the pyrometer is set up correctly, the downstream controller should indi-
cate the values you have entered (only within the scaled range). If there
is a discrepancy, please check the current range scale or the cable con-