Pelco GIT100 Specsheet
PRODUCT SPECIFICATION
NOTE: VALUES IN PARENTHESES ARE CENTIMETERS;
ALL OTHERS ARE INCHES.
1.90
(4.83)
4.25
(10.80)
5.75
(14.61)
0.19 (.48), 2X
5.00
(12.70)
6.50
(16.51)
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
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 0.5 Vp-p are commonly found between two points in the same
building.
GIT100
provides a high degree of common
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.
The
GIT100
is especially suited for use with Coaxitron
systems because the passive design allows for bi-directional
transmission of control and video signals.
C600 / REVISED 4-96
®
control
International Standards
Organization Registered Firm;
ISO 9001 Quality System
TECHNICAL SPECIFICATIONS
MODEL
GIT100 Passive ground isolation transformer
VIDEO
Ground Loop Voltage Maximum CMV of 10 Vp-p at 60 Hz
Video Performance
Characteristics Equivalent in all respects to approximately
Common Mode
Rejection (CMR) See Table A and Figure 1
Connectors BNC
compatible with Coaxitron control systems
200 feet (60.96 m) of RG59/U coax
Table A.
Common Mode Rejection (CMR)
Length of RG59/U Effective CMR at 60 Hz
200 feet (60.96 m) 43 dB
400 feet (121.9 m) 37 dB
600 feet (182.9 m) 33 dB
800 feet (243.8 m) 31 dB
1,000 feet (300.8 m) 29 dB
GENERAL
Unit Weight 3 lb (1.35 kg)
Shipping Weight 4 lb (1.81 kg)
CERTIFICATIONS/RATINGS
• UL Listed
• Meets NEMA Type 1 standards
INSTALLATION
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.
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
60 dB
50 dB
200 feet
RG59/U
•
•
40 dB
•
•
•
30 dB
•
60 100 1 kHz 10 kHz 50 kHz
Figure 1. Effective Ground Loop Voltage Attenuation
1000 feet
RG59/U
•
•
•
•
TYPICAL CONFIGURATION
Pelco, Inc. Worldwide Headquarters:
3500 Pelco Way, Clovis, California 93612-5699 USA
USA & Canada
International
www.pelco.com
Tel: (800) 289-9100 • FAX: (800) 289-9150
Tel: +1 (559) 292-1981 • FAX: +1 (559) 348-1120
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.
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