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Pelco ground isolation transformer GIT100 -
Ground Loop Isolation Transformers
Pelco GIT-100 Passive ground isolation transformer GIT100
The GIT100 is a ground loop isolation transformer which reduces ground-loop interference in CCTV signals and can easily be added to existing systems. The GIT100 provides a high degree of common mode isolation at power line frequencies, but passes signal frequencies from DC to over 200 MHz.
The GIT100 is useful where a video signal is transmitted via cable between points with different ground potentials. Differences in ground potentials are typically caused by unbalanced power line loads, and the peak-to-peak magnitude may vary from zero to more than ten volts. The larger voltages are common for distances of a few thousand feet, not for small separations. Potentials of greater than 0.5V p-p are commonly found between two points in the same building.
Because the GIT100 is passive and weatherproof, it can be conveniently located anywhere in your coax cable where ground loop potentials exist. More than one unit can and may be needed in situations where ground loop potential exceeds 10 Vp-p.
The GIT100 was developed to minimize problems stemming from the existence of ground loop potentials (common mode voltages). In addition to providing an effective reduction of common mode voltages (CMV) at power line frequencies, it is even more effective at higher frequencies.
