Adjustment Procedure; Adjusting The Brightness; Adjusting The Contrast; Adjusting The White Balance - Ikegami HTM-1990R Operation Manual

4-6. Adjustment Procedure

The following adjustments will be more precise if
you dim the monitoring environment.

(1) Adjusting the brightness

a) Brightness
Brightness adjustment is to set the appropriate
black level.
It must be adjusted according to the brightness of
the environment in which the monitor is used so
that the black level is not too high or too low.
b) Adjustment procedure
① Input signal
Select the gray scale with pluge using the internal
TEST signal.
② Adjusting BRIGHTNESS
While taking note of the pluge portion at the center
of the signal, decrease BRIGHTNESS gradually
until the brightness of Part A (–2%) and Part B
(0%) in the figure cannot be visually differentiated.
Also make sure that Part C (+2%) is illuminated
slightly. If this cannot be confirmed, raise
BRIGHTNESS until Part C gets a little bright.
Part A Part B
-2％ 0％
Fig. 4-6-1. Pluge Portion

(2) Adjusting the contrast

a) Contrast
Contrast of the monitor is factory-adjusted to the
level optimum for monitoring images.
b) Precautions
Leaving the monitor in the bright state (where the
OVER LOAD LED is lit) for a long period of time
will shorten the life of the CRT. Therefore adjust
the PRESET data to the value shown below.
c) Adjustment procedure
① Input signal
Input a window signal (100%) or select the internal
TEST signal (window signal).
②Measure the luminance value of the window using
a luminance meter, and adjust the contrast to
120nit(cd/m 2 ) or 35fL.
Part C
+2％
25

(3) Adjusting the white balance

a) White balance
The monitor has four files to store white balance
data. The four files are set to the following color
temperatures as default.
REFERENCE :
FILE 1 :
FILE 2 :
FILE 3 :
* The white balance can be adjusted using an
analyzer or the optional ASP-80 (option) for
automatic adjustment.
* Use the FILE 3 when you want to store custom-
adjusted color temperature data.
b) Precautions
To stabilize the black level over a long period of
time, this monitor adopts the beam feedback clamp
method which detects beam currents to perform
clamping. Therefore one line (Part A in Fig. 4-6-2)
is displayed on the CRT.
Fig. 4-6-2. SETUP ON State
If the BACKGROUND is lowered so that Part B in
Fig. 4-6-2 becomes invisible, the line at Part A
disappears, disabling the detection of the beam
current.
P a y c a r e f u l a t t e n t i o n w h e n a d j u s t i n g
BACKGROUND.
c) Adjustment procedure 1 (Adjusting visually)
① Input signal
Input a color bar signal or select the internal TEST
signal (gray scale with pluge).
② Setting the file
Select the file whose white balance you want to
change.
Adjust BRIGHTNESS and CONTRAST properly
before adjusting the white balance.
③ Settings before adjusting BACKGROUND
Set the MONO switch on the front panel to ON for
color bar signals and set the black/white screen.
Set the SET UP switch in the drawer panel to ON
and set as follows.
6500k
6500k
9300k
6500k
Part A
Beam feedback line
Part B
SET UP line for reduced
vertical deflection