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Transcript
PRODUCT SPECIFICATION video transmission GIT100 Transformer GROUND LOOP ISOLATION Product Features • Passive Device • Wide Bandwidth • Attenuates Ground Loop Interference • Compatible with Coaxitron ® Control Systems • Easily Added to Existing Systems The GIT100 is a ground loop isolation transformer which reduces ground loop interference in video 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. 5.00 (12.70) 1.90 (4.83) 6.50 (16.51) 4.25 (10.80) 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 0.5 Vp-p are commonly found between two points in the same building. 5.75 (14.61) 0.19 (.48), 2X 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. NOTE: VALUES IN PARENTHESES ARE CENTIMETERS; ALL OTHERS ARE INCHES. 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. The GIT100 is especially suited for use with Coaxitron® control systems because the passive design allows for bi-directional transmission of control and video signals. C600 / REVISED 4-96 International Standards Organization Registered Firm; ISO 9001 Quality System TECHNICAL SPECIFICATIONS MODEL Table A. Common Mode Rejection (CMR) GIT100 Passive ground isolation transformer compatible with Coaxitron control systems Length of RG59/U 200 feet 400 feet 600 feet 800 feet 1,000 feet VIDEO Ground Loop Voltage Video Performance Characteristics Common Mode Rejection (CMR) Connectors Maximum CMV of 10 Vp-p at 60 Hz Equivalent in all respects to approximately 200 feet (60.96 m) of RG59/U coax Effective CMR at 60 Hz (60.96 m) (121.9 m) (182.9 m) (243.8 m) (300.8 m) 43 dB 37 dB 33 dB 31 dB 29 dB See Table A and Figure 1 BNC GENERAL Unit Weight Shipping Weight 3 lb (1.35 kg) 4 lb (1.81 kg) CERTIFICATIONS/RATINGS • UL Listed • Meets NEMA Type 1 standards 200 feet RG59/U • 40 dB • Although the GIT100 does not perform in all the manners of classical transformers, installation requirements are similar. A transformer must be placed between any two points where the cable shield is grounded and common mode voltage exists. The GIT100 may be placed anywhere in your video signal cable. This allows convenience to dictate its location. More than one unit can be utilized in situations where the CMV exceeds 10 Vp-p. 30 dB • • 50 dB • • • INSTALLATION • 60 dB • 1000 feet RG59/U • 60 100 1 kHz 10 kHz 50 kHz Figure 1. Effective Ground Loop Voltage Attenuation Table I and Figure 1 show that common mode rejection is inversely proportional to cable length and approximately proportional to the third root of frequency (rejection increases at approximately 6 dB per decade). GIT100 TYPICAL CONFIGURATION Pelco, Inc. Worldwide Headquarters: 3500 Pelco Way, Clovis, California 93612-5699 USA USA & Canada Tel: (800) 289-9100 • FAX: (800) 289-9150 International Tel: +1 (559) 292-1981 • FAX: +1 (559) 348-1120 www.pelco.com Pelco, the Pelco logo, and Coaxitron are registered trademarks of Pelco, Inc. Product specifications and availability subject to change without notice. ©Copyright 1996, Pelco, Inc. All rights reserved.