Pelco GIT100 User Manual

®

Installation/Operation

GIT100
Ground Transformer

C600M-B (4/00)

Pelco • 3500 Pelco Way • Clovis, CA 93612-5699 USA • www.pelco.com

In North America and Canada: Tel [phone] • FAX [phone]

PelcoEurope BV • Dillenburg Center, Dillenburgstraat 5F • 5652 Eindhoven • The Netherlands

International Customers: Tel [phone] • FAX [phone]

Tel [phone] • FAX [phone]

IMPORTANT SAFEGUARDS AND WARNINGS

Prior to installation and use of this product, the following WARNINGS should be observed.

1. Installation and servicing should only be done by qualified service personnel and conform to all local
codes.

2. Unless the unit is specifically marked as a NEMA Type 3, 3R, 3S, 4, 4X ,6 or 6P enclosure, it is de­signed for indoor use only and it must not be installed where exposed to rain and moisture.

3. Only use replacement parts recommended by Pelco.

DESCRIPTION

The GIT100 Ground Loop Isolation Transformer reduces interference with CCTV signals caused by
ground loop potentials.

A ground loop is an electrical problem that happens when an AC current interferes with the ground refer­ence level of the video signal. It occurs on the conductive path formed by the shield of the coaxial video
cable and the chassis of the video equipment. A loop results from the difference between the voltage po­tential of the shield at one end of the cable, versus the voltage potential of the shield at the other end.

The electrical level of the shield is usually zero volts. When a ground loop is present, this level fluctuates
above and below zero volts. The greater the difference, the more severe the video distortion or tearing.
If the potential is too great, it can destroy the equipment.

Larger voltages are common for distances of a few thousand feet, not for small separations. Potentials of
greater than 0.5 are commonly found between two points in the same building.

INSTALLATION

For best results place the transformer near the monitor. Refer to Figure 1.

The shorter the coaxial cable the greater the performance of the GIT100. Use more than one ground loop
isolation transformer when the ground loop potential exceeds 10 Vp-p; typically, place one transformer at
each end of the coaxial cable.

GTI100

Figure 1. Basic Installation of the GIT100 Transformer

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Pelco Manual C600M-B (4/00)

SPECIFICATIONS

VIDEO

Ground Loop Voltage: Maximum rejection of 10 Vp-p at 60 Hz

Video Performance
Characteristics: Equivalent in all respects to approximately 200 feet (60.96 m) of RG-59/U

Connectors: BNC

GENERAL

Dimensions: 1.90 (H) x 4.25 (W) x 6.50 (L) inches (4.83 x 10.80 x 16.51 cm)

Weight: 3 lb (1.35 kg)

Rating: NEMA 1

(Design and product specifications subject to change without notice.)

coaxial cable

Table A. Common Mode Rejection

Length of RG59U 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

60 dB

50 dB

40 dB

30 dB

200 feet

RG59U

1000 feet

RG59U

60 100 1 kHz 10 kHz 50 kHz

Figure 2. Effective Ground Loop Voltage Attenuation

Pelco Manual C600M-B (4/00)

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PRODUCT WARRANTY AND RETURN INFORMATION

WARRANTY

Pelco will repair or replace, without charge, any merchandise proved defective in material or workmanship for a period of one year after the date of
shipment.

Exceptions to this warranty are as noted below:

• Five years on FT/FR8000 Series fiber optic products.

• Three years on Genex

• Three years on Camclosure
MC3651H-2X camera models, which have a five-year warranty.

•Two years on standard motorized or fixed focal length lenses.

•Two years on Legacy

•Two years on Spectra

•Two years on Esprit

• Eighteen months on DX Series digital video recorders, NVR300 Series network video recorders, and Endura
products.

• One year (except video heads) on video cassette recorders (VCRs). Video heads will be covered for a period of six months.

• Six months on all pan and tilts, scanners or preset lenses used in continuous motion applications (that is, preset scan, tour and auto scan modes).

Pelco will warrant all replacement parts and repairs for 90 days from the date of Pelco shipment. All goods requiring warranty repair shall be sent freight
prepaid to Pelco, Clovis, California. Repairs made necessary by reason of misuse, alteration, normal wear, or accident are not covered under this
warranty.

Pelco assumes no risk and shall be subject to no liability for damages or loss resulting from the specific use or application made of the Products. Pelco’s
liability for any claim, whether based on breach of contract, negligence, infringement of any rights of any party or product liability, relating to the Products
shall not exceed the price paid by the Dealer to Pelco for such Products. In no event will Pelco be liable for any special, incidental or consequential
damages (including loss of use, loss of profit and claims of third parties) however caused, whether by the negligence of Pelco or otherwise.

The above warranty provides the Dealer with specific legal rights. The Dealer may also have additional rights, which are subject to variation from state
to state.

If a warranty repair is required, the Dealer must contact Pelco at [phone] or [phone] to obtain a Repair Authorization number (RA), and
provide the following information:

1. Model and serial number

2. Date of shipment, P.O. number, Sales Order number, or Pelco invoice number

3. Details of the defect or problem

If there is a dispute regarding the warranty of a product which does not fall under the warranty conditions stated above, please include a written
explanation with the product when returned.

Method of return shipment shall be the same or equal to the method by which the item was received by Pelco.

RETURNS

In order to expedite parts returned to the factory for repair or credit, please call the factory at [phone] or [phone] to obtain an authorization
number (CA number if returned for credit, and RA number if returned for repair).

All merchandise returned for credit may be subject to a 20% restocking and refurbishing charge.

Goods returned for repair or credit should be clearly identified with the assigned CA or RA number and freight should be prepaid. Ship to the appropriate
address below.

If you are located within the continental U.S., Alaska, Hawaii or Puerto Rico, send goods to:

Service Department
Pelco
3500 Pelco Way
Clovis, CA 93612-5699

If you are located outside the continental U.S., Alaska, Hawaii or Puerto Rico and are instructed to return goods to the USA, you may do one of the
following:

If the goods are to be sent by a COURIER SERVICE, send the goods to:

Pelco
3500 Pelco Way
Clovis, CA 93612-5699 USA

®

Series products (multiplexers, server, and keyboard).

®

and fixed camera models, except the CC3701H-2, CC3701H-2X, CC3751H-2, CC3651H-2X, MC3651H-2, and

®

, CM6700/CM6800/CM9700 Series matrix, and DF5/DF8 Series fixed dome products.

®

, Esprit®, ExSite™, and PS20 scanners, including when used in continuous motion applications.

®

and WW5700 Series window wiper (excluding wiper blades).

If the goods are to be sent by a FREIGHT FORWARDER, send the goods to:

Pelco c/o Expeditors
473 Eccles Avenue
South San Francisco, CA 94080 USA
Phone: [phone]
Fax: [phone]

™

Series distributed network-based video

REVISION HISTORY

Manual # Date Comments

C600M-A 9/90 Rev. A.
C600M-B 3/00 Updated manual to new format.

Pelco, the Pelco logo, Spectra, Genex, Legacy, and PelcoVision are registered trademarks of Pelco. © Copyright 2000, Pelco.
Endura, Esprit and Camclosure are trademarks of Pelco. All rights reserved.

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Pelco Manual C600M-B (4/00)