ST-HDoC / ST-HDoC-MM
3
PTZ control: Pan, tilt & zoom, focus adjustment, IRIS Open/Close and set preset
positions.
12VDC 1A output power for cameras.
Audio input and output tests. Outputs an audio signal.
Digital multimeter (ST-HDoC-MM)
Lithium Ion Polymer Battery. Remaining battery charge indicator, Lithium Ion Polymer
battery can last up to 11 hours of normal use after charging for 4 -5 hours.
2.3 Function
2.3.1 Video signal test
The new ST-HDoC tester with 3.5 inch LCD-TFT, 480（RGB）x320 resolution, allows the user to view
the images from sufficient angles. The display is suitable for outdoor installation and maintenance
work.
2.3.2 Video level meter (CVBS)
Performs NTSC and PAL video amplitude signal measurements for PEAK to PEAK, SYNC level,
COLOR BURST, and CHROMA level
Video signal PEAK to PEAK level:
For NTSC format, the video signal level is 140±15IRE
For PAL format, the video signal level is 1000±200mV
If the level is too low, it will cause the image to lose quality and limit the distance it will travel over a
coaxial cable. If the level is too high, it will lead to a washed out image.
SYNC level: Testing the amplitude of the video sync pulse to verify if the video level is correct.
For NTSC format, the SYNC level is 40 ± 5IRE
For PAL format, the SYNC level is 300 ± 35mV
If the level is too low, it will cause the image to not frame out properly. If the level is too high, it will
lead to poor video quality.
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