ANSI SCTE 103-2018 pdf free download.Test Method for DC Contact Resistance, Drop cable to “F” connectors and F 81 Barrels
1.0 SCOPE
This document is identical to SCTE 103 2012 except for informative components which may have been updated such as the title page, NOTICE text, headers and footers. No normative changes have been made to this document. The purpose of this test procedure is to measure the contact resistance or intimacy of contact between an F connector and the drop cable shield (outer conductor contact resistance) or the cable center conductor and the F81 barrel (inner conductor contact resistance.). This method is used to evaluate the tendency for unwanted high-resistance contacts. Depending on the application, high resistance contacts may cause excessive energy losses, overheating and possibly, in Cable Telecommunications systems, common path distortions. In any case however, it is most desirable to have contact resistance as close to zero as possible .
2.0 NORMATIVE REFERENCES
The following documents contain provisions, which, through reference in this text,constitute provisions of this standard. At the time of subcommittee approval, the editions indicated were valid. All standards are subject to revision, and parties to agreement based on this standard are encouraged to investigate the possibility of applying the most recent editions of the documents listed below.
2.1 ANSI/SCTE 74 2011: Specification for Braided 75 Ohm Flexible RF Coaxial Drop Cable.
2.2 ANSI/SCTE 123 2011: Specification for “F” Connector, Male, Feed-Through.
2.3 ANSI/SCTE 124 2011: Specification for “F” Connector, Male, Pin Type.
2.4 ANSI/SCTE 155 2008: Indoor “F” Female to “F” Female Inline Splice.
3.0 INFORMATIVE REFERENCES
The following documents may provide valuable information to the reader but are not required when complying with this standard.
3.1 ANSI/SCTE 44 2010: Test Method for DC Loop Resistance.
6.0 TEST SAMPLES
6.1 CONNECTOR TO SHIELD CONTACT
Cable for the test sample should be cut to 12” ± 0.125” long. The male “F” connector should be installed onto one end of the cable using the manufacturer’s recommended instructions and tools. The inline “F” female splice should be installed on the “F” Male Connector and tightened to manufacturer recommendations. 2” ± 0.125” of the jacket on the non-connectorized end shall be removed. The test sample may be pre-conditioned prior to testing, i.e., temperature cycled, humidity cycled, etc.
6.2 CONNECTOR TO CENTER CONDUCTOR CONTACT
Cable for the test sample should be two samples 12” ± 0.125” long each. The ”F Male connectors should be installed onto one end of each cable using the manufacturer’s recommended instruction and tools. Install the connectorized samples on the inline “F” female splice and tighten to manufacturers recommendations. 2” ± 0.125” of the jacket, outer shield(s) and dielectric shall be removed to cleanly expose the center conductor on each non-connectorized end. The test sample may be pre-conditioned prior to testing, i.e., temperature cycled, humidity cycled, etc.
6.3 SHIELD, CONNECTOR AND CENTER CONDUCTOR CONTACT (LOOP)
Cable for the test sample should be cut to 12” ± 0.125” long. A “F” Male connector should be installed onto one end of the cable using manufacturer recommended instruction and tools. The “F” female splice should be installed into the F-Connector and tightened to manufacturer recommendations. A jumper should be constructed to connect between the outer surface of the F Female splice and the center contact of the splice. It may be useful to use a length of 18 AWG, solid copper wire with an appropriately sized lug soldered onto one end, attached to the threaded portion of the splice and the other end inserted into the center contact.
7.0 EQUIPMENT
7.1 Ammeter – Capable of measuring 0 – 10 Amperes with a full-scale accuracy of 2% maximum, CEN-TECH Model number P37772 or equivalent.
7.2 Digital Multimeter – Capable of measuring the voltage range with an accuracy of 1% maximum, Fluke DMM Model number 5050A or equivalent.
7.3 DC Power supply capable of delivering current up to 10 Amperes, with a full- scale accuracy of 2% maximum, EPSCO DC power supply Model Number EFB 15 or equivalent.
7.4 Load tester, 500 Ampere Chicago Electric Model 91129 or equivalent
