JVC GY-DV500 Shooting the Screen Image on a Computer Monitor, Gain Sensitivity Adjustment

Page 42

13. FEATURES OF THE CAMERA SECTION

13-3 Shooting the Screen Image on a Computer Monitor

13. FEATURES OF THE CAMERA SECTION

13-4 Gain (Sensitivity) Adjustment

Outline

The gain should be switched when the brightness is insufficient due to poor lighting conditions.

Band

Video monitor

FILTER

 

 

ALARM

 

 

MONITOR

 

GAIN OUTPUT

WHT.BAL

VTR

 

NG POWER

SHUTTER dial

- - - OPERAT

I ON - - -

SCENE

F I L E

A

SHUT TER

 

: VAR I ABL E

FAW

 

: NONE

GA I N L

 

: 0 dB

The following operation allows the alignment of the shutter speed of the camera with the variable scanning rate of a computer monitor or display.

When a computer monitor screen or display is shot with the camera, a bright horizontal line indicating excessive exposure is displayed in cases when the scanning rate of the monitor is faster than the shutter speed of the camera. A dark horizontal line indicating insufficient exposure is displayed in cases when the monitor's scanning rate is slower than the camera's shutter speed.

The scanning frequency of a monitor varies due to various reasons during the computer operation. Adjust the scanning rate to obtain a stable image while observing the image in the viewfinder.

Variable Scan [V.SCAN]

Basic operation

Set the SHUTTER item on the OPERATION MENU screen to VARIABLE. Then move the SHUTTER knob upwards or downwards to change the shutter speed.

(The speed is displayed on the viewfinder screen.)

Compatible frequencies

The variable scan function is compatible with scanning frequencies in the following range.

60.1to 2084.6 Hz (U-ver.)

50.1to 2067.8 Hz (E-ver.)

CAUTION:

GAIN SWITCHING

GAIN switch

AUTO IRIS

FULL AUTO BLACK

 

 

 

LOLUX

BACK L

 

 

 

STRETCH

 

NORMAL

 

 

 

NORMAL

 

SPOT L

 

 

 

COMPRESS

 

 

 

 

ON

E

 

B

 

L

AM

KNE

 

T

STBY

M

BARS

O

AUTO

 

PRS

H

FF

 

 

 

 

 

 

 

 

AVE

 

OUTPUT

WHT.BAL

S

GAIN

VTR

 

 

 

 

 

 

 

NG POWER

ONOFF

CAUTION:

When gain is set to "ALC", gain is boosted automatically as the illumination becomes darker. However, noise will increase a little because the screen becomes brighter as the ALC (Auto Level Control) function boosts the gain more than in the case of manual adjustment.

This switch allows the gain to be boosted when the illumination of the subject is insufficient.

Switch Position

Factory-Set Gain

L

0dB

 

 

M

9dB

 

 

H

18dB

When the GAIN switch is switched, the newly set gain is displayed for about 2 seconds on the Status 0 or Status 1 screen in the viewfinder.

Set it to L (0 dB) in normal use.

The gain set for each of the switch positions can be changed with "GAIN" on the OPERATION MENU screen.

It is also possible to use the ALC function that varies the gain automatically.

See page 73 for details.

To make the gain transition smoother, set “SMOOTH TRANS” on the OPERATION MENU to “ON”.

See page 73.

However, note that the SMOOTH TRANS function is not available if gain is set to ALC.

GA I N

M

: 9 d B

GA I N

H

: 1 8 d B

SMOOTH TRANS

: OFF

PAGE BACK

 

This function is not compatible with slow-speed computer monitors with a vertical scanning speed of 60 Hz (U-ver.)/ 50 Hz (E-ver.).

GAIN BOOST UNDER LOLUX CONDITION

LOLUX on/off button

OPERATION MENU screen

AUTO IRIS

FULL AUTO BLACK

 

 

 

LOLUX

BACK L

 

 

 

STRETCH

 

NORMAL

 

 

 

NORMAL

 

SPOT L

 

 

 

COMPRESS

 

 

L

CAM

N

KNEE

 

B

 

O

 

A

STBY

M

BARS

FF

AUTO

 

PRST

O

 

 

E

H

 

WHT.BAL

S

 

 

 

 

AV

 

OUTPUT

 

 

VTR

GAIN

 

 

 

 

 

 

 

NG POWER

ONOFF

The LOLUX button is used when the illumination is still insufficient after compensating with the GAIN switch.

Press the button to enter the LOLUX mode in which the gain is boosted by about 33 dB.

"LOLUX ON" is displayed for about 2 seconds on the Status 0 or Status 1 mode screen in the viewfinder.

Pressing the button again cancels the LOLUX mode. "LOLUX OFF" is displayed for about 2 seconds.

When the LOLUX function is in use, the image definition on the screen will degrade to increase residual images, but this is not a malfunction.

81

[Relationship between gain, iris and shutter]

0.7 Lx

8 Lx

32 Lx

2000 Lx

4200 Lx

18000 Lx

 

 

 

 

 

FULL AUTO SHOOTING

 

 

 

 

 

 

 

 

 

 

 

 

 

1/60 (U-ver.)

1/240 (U-ver.)

 

 

 

 

 

 

 

 

33 dB

12dB

0 dB

 

 

1/50 (E-ver.)

1/200 (E-ver.)

 

LOLUX

 

ALC

 

AUTOMATIC IRIS

 

 

 

EEI

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

F1.4

 

F11

F16

 

 

 

82

Image 42
Contents Precautions when writing S.S.F. data Precautions for Use of Head Cleaning TapeFor Customer Use Varning InformationRemarque VaroitusMain Features 10. S.S.F. Super Scene Finder FunctionMain Unit Configuration Precautions for Proper UseIntroduction Characteristic CCD Phenomena Routine and Periodical MaintenanceBattery Pack to be Used CondensationFront Section Front Section Cont’dCamera Setting Section Time Code Generator setting switches Audio Setting SectionVCR Setup Block Right Side Section ContdVCR Display Section Left Side Section Top SectionRear Section Rear Section ContdCounter Display Contents S14 x 7.3B12 Lens optional1.5-Inch Viewfinder optional VF-P115BIndications in Viewfinder Contd  Warning LED Indicators Inside the ViewfinderIndications in Viewfinder  Viewfinder Screen Display Alarm Message Display Indication Indication ContentsBasic System  Safety Zone Setting the Screen Display  Auto White Balance DisplayAttaching the Microphone optional Attaching the Zoom Lens optionalAttaching the Microphone provided Attaching the Viewfinder How to Install the Lithium Battery Inserting and Replacing Backup Lithium BatteriesLithium battery CR2032  How to Remove Lithium BatteriesBattery Pack Operation Power SupplyBattery Pack Operation Contd Attaching a Flat Shape Type Battery PackPrecautions for the Battery Pack Remaining Battery Power DisplayAttaching and Detaching an Anton-Bauer Battery Pack Using an Anton-Bauer Battery PackCassette Loading and Unloading Turning the Power onPreparations Loading the CassettePower on Setting the Date and TimeCamera Settings FilterViewfinder Adjustment Back Focus AdjustmentExternal Monitor Adjustment White Balance Adjustment Switch Settings of the VCR SectionWhite Balance Adjustment Audio Input Signal Selection Recording Level AdjustmentShooting Operation Monitoring Audio during RecordingBasic Recording Operation Recording from the Save mode VCR Save ModeIf Unit is Left in Record-Pause Standby Mode About the Quick REC ModePlayback Mode Playback ProcedureOperation Fast-Forward, Rewind Presetting and Recording of Time CodeTime Code Operation Displaying Time CodeTime Code Presetting Procedure for E-ver Time Code Presetting Procedure for U-verPresetting Users BIT Data SettingExplanation of the S.S.F. Function  Mark ModeReproducing Time Codes CUECUE Mode How to Use the S.S.F. FunctionResetting S.S.F. Data Mark ModeWriting S.S.F. Data to Tape Using External ComponentsConnecting a Video Component with DV Connector Outputting S.S.F. DataVCR Setup Menu Setup MenuConnecting a PC VCR Setup Menu ConfigurationVCR Setup Menu Contd Displaying and Setting VCR Setup MenusVCR Setup Menu Contents Camera Menu Screen Flow Setting Factory Group Value ContentsCamera Menu Screen Flow Time CodeHow to Select from the Camera Menu VF Display ScreenOperation Screen Process ScreenFile Manage Screen Skin Color Adjust ScreenAdvanced Process Screen Storage OperationSetup Screen Resetting of Camera Menu Setting ValuesReset Operation Adjustment of Lens Iris Features of the Camera SectionIris Brightness Adjustment Zebra Pattern Display During Manual AdjustmentShooting the Screen Image on a Computer Monitor Gain Sensitivity AdjustmentGain Switching  OutlineSwitch Functions Switch Setup According to Illumination and SubjectHow to Use Skin Detail Full Auto Shooting FAS FunctionAlarm Indications How to Use Skin Detail Cont’dTroubleshooting  Using the Skin Detail FunctionTroubleshooting Contd Alarm Indications ContdDew condensation indicator Troubles with Error Code OutputsError Code Error Details GY-DV500 Operation Remedy Alarm Tone Display GY-DV500 OperationTroubles Without Error Code Outputs Symptoms RemedyHour Meter Display Specifications Specifications ContdExternal Dimensions unit mm