Pelco CC3751H-2 Benutzerhandbuch

 

C1988M-B-ML  (3/05)

7

 

Set the lens mode selector switch to AIV. Switch the ESC and AGC OFF. Refer to the lens instructions 
and adjust the lens for the optimum picture (video output level of 1V peak-to-peak). To focus, fully 
open the iris by covering the lens with a suitable neutral density (ND*) filter. If the viewed scene is    
6.5 feet (2 m) away or farther, set the lens focus to infinity (far). Use the back focus adjustment ring 
(refer to the 

 

 section) and focus on the selected scene. Remove the ND filter 

and set the lens focus as required.

 

Set the lens mode selector switch to AID. Switch the ESC ON. Use an appropriate screwdriver to turn 
the lens level potentiometer (refer to Figure 1) fully clockwise. Next, slowly adjust the potentiometer 
counterclockwise until the optimum picture is obtained (video output level of 1V peak-to-peak).            
To focus, fully open the iris by covering the lens with a suitable neutral density (ND*) filter. Select the 
scene to be viewed. If the viewed scene is 6.5 feet (2 m) away or farther, set the lens focus to infinity 
(far). Use the back focus adjustment ring (refer to the 

 

section) to focus on the 

selected scene. Remove the ND filter and set the lens focus as required.

 

To focus, set the lens focus to infinity and view an image greater than 6.5 feet (2 m) away. Focus the 
image with the back focus adjustment ring (refer to the 

 

section). Set the lens 

focus as required.

 

To focus, open the iris fully and set the lens focus to infinity. View an image greater than 6.5 feet           
(2 m) away. Focus the image with the back focus adjustment ring (refer to the 

 

 

section). Adjust the lens focus, and set the iris for the best picture quality. The largest aperture gives 
the best light sensitivity, the smallest aperture the greatest depth of field. 

 

Set the lens focus to infinity (far) and fully open the iris by covering the lens with a suitable neutral 
density (ND*) filter. Zoom out to the widest field of vision and view a distant object. Adjust the back 
focus adjustment ring until the object is in focus (refer to the 

 

 section).         

Next, zoom fully in and adjust the lens focus until the object is again focused. Repeat these steps until 
the full zoom range may be viewed with the minimum loss of focus.

 

  For best results, outdoors, use an ND3 filter.

 

The back focus adjustment is located at the front of the camera and is accessible from either side of 
the case.

To adjust the back focus:

1. Loosen the two back focus locking 

screws (one on each side). 

2. Turn the back focus ring until the object 

is in focus.

3. When the back focus adjustment is 

satisfactory, tighten the locking screws. 
Do not over tighten the locking screw or 
force the back focus adjustment ring.

 

Back Focus Adjustment

BACK FOCUS

ADJUSTMENT

LOCKING SCREW

COU

NTE

RCLO

CKW

ISE

CLOC

KWIS

E

BACK FOCUS

ADJUSTMENT

RING