Description Of Inputs And Outputs; Composite Video Output (Bnc); Modulated Rf Output; Audio Inputs And Outputs - Promax GV-798+ Instruction Manual

Colour pattern generator GV-798+

5 DESCRIPTION OF INPUTS AND OUTPUTS

5.1 Composite video output (BNC)

The composite video output is achieved through the VIDEO connector
on the front panel. The polarity of the signal is positive, the black level being 0 V. The
output level is fixed to 1 Vpp. This signal is very useful in testing B/W and colour video
monitors, linear amplifiers, VCR or any other equipment which operates with a
composite video signal.
CAUTION This signal must not be connected to any live point in a circuit, but
only to normalized video inputs of 75 Ω impedance. Any damage
produced in the equipment due to non-observation of this precaution
is not covered by the guarantee.

5.2 Modulated RF output

The modulated RF output is achieved througt the RF connector
front panel.
The possibility of attenuating the RF output has been foreseen for testing the
automatic gain control circuits and the sensitivity of television sets: permitting a total
maximum attenuation of 60 dB in steps of 1 dB.

5.3 Audio inputs and outputs

The BNC connectors R [30] and L [31] permit the entry of external audio signals
(right and left channel respectively) which can be used to modulate the TV signal audio
carriers. Besides, the R [32] and L [33] connectors provide a low frequency output for
the right and left channels respectively.

5.4 Video input and Blackburst output

The external video entry can be achieved through the VIDEO [34] BNC
connector, on the rear panel.
The BLACKBURST [35] output provides a Blackburst signal which comprises
a black image with complete frame and line synchronism and Burst and Chrominance
signals. It acts as a standard synchronism generator for the synchronisation of all the
equipment forming part of a production chain.
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