VMD-1R // //

VMD-1R

VMD-1R Portable signal tester

The VMD-1R is a portable signal tester for measuring the parameters of a composite video signal for video surveillance systems.

Functional application
The VMD-1R portable diagnostic signal tester is an effective device for saving time on installing video cameras, checking video lines, and adjusting equipment for video transmission and for the recording of video signals. The VMD-1R enables the testing and locating of failures in video surveillance systems without using an oscilloscope.

Operational principle
The signal tester processes the composite video signal, divides it into components, and separately measures the range of each while indicating the results in volts on the built-in LCD.

The VMD-1R is able to operate with PAL and NTSC video signals.

Measurable parameters

Us – the amplitude of the sync pulse in the video signal.

Ub – the amplitude of colour burst signal for colour picture cameras.

Umax – the peak amplitude of the luminance signal.

Uavr – average value of the luminance signal (by half-frame).

Additional functions of VMD-1R:

The value of the measured parameter, which is indicated on the LCD display, is compared with the technical standard rate (Us = 314 = normal).

The absence of a video signal is indicated as 'No Video' on the LCD display. When the measuring mode is switched off, the value of the battery voltage 'BAT = 2.72 normal' is indicated on the LCD display. The signal tester shows the presence of the video signal by the light-emitting diode.

Where the VMD-1R is used:

- Control of video camera operation

- Adjustment of the auto- aperture control system

- Measurement of video signal losses in transmission lines and video signal presence control

- Adjustment of video amplifiers and video signal transmitters in UTP CCTV networks

- The fast black level clamping of the video signal in the output of the signal tester for LCD monitors

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Technical Characteristics of the VMD-1R

The range of video signal parameters

Parameter	Value
Us (270 mV ≤ norm ≤ 330 mV )	100 – 600 mV
Ub (280 mV ≤ norm ≤ 390 mV )	100 – 600 mV
Umax (670 mV ≤ norm ≤ 770 mV )	100 mV – 1,5 V
Uavr	100 mV – 1,5 V

Accuracy of measurements for PAL standard

Parameter	Value
Us and Ub	+/- 5 %
Umax and Uavr	+/- 10 %
Input resistance	75 Ohm
Output resistance	75 Ohm
Error in clamping level	+/- 50 mV
DC supply voltage	3 V
Supply current	150 mA
Dimensions	135 X 70 X 24 mm
Weight	160 g
Battery type	2 AA
Maximal recommended input voltage	20 V
Continuous operation time (without charging batteries 2 A 1800 mAH )	not less than 8 hrs.

Control of
video camera operation
___________________

Adjustment of
auto-aperture control
system
___________________

Measurement of video
signal losses in
transmission lines
and video signal
presence control
___________________

Adjustment of video
amplifiers and video
signal transmitters
in UTP CCTV networks
___________________

Fast black
level clamping of
the video signal
in the output of
the signal tester
for LCD monitors.