ANSI SCTE 44-2018 pdf free download – Test Method for DC Loop Resistance.
This document is intended for use in determining the DC Loop Resistance of coaxial cables. Due to low resistances, a four-wire test method is used.
1.3. Benefits
This document is designed to benefit manufacturers and end users of product tested to this procedure by supplying a standardized method for determining DC Loop Resistance values of coaxial cable.
1.4. Intended Audience
This document is intended for anyone desiring to make industry standard DC Loop Resistance measurements of coaxial cable, or for anyone acquiring product purported to have been tested using this method.
1.5. Areas for Further Investigation or to be Added in Future Versions
There are none at this time.
2. Normative References
The following documents contain provisions, which, through reference in this text, constitute provisions of this document. At the time of Subcommittee approval, the editions indicated were valid. All documents are subject to revision; and while parties to any agreement based on this document are encouraged to investigate the possibility of applying the most recent editions of the documents listed below, they are reminded that newer editions of those documents might not be compatible with the referenced version.
2.1. SCTE References
• No normative references are applicable.
2.2. Standards from Other Organizations
• No normative references are applicable.
2.3. Published Materials
• No normative references are applicable.
3. Informative References
The following documents might provide valuable information to the reader but are not required when complying with this document.
3.1. SCTE References
• No informative references are applicable.
3.2. Standards from Other Organizations
• MIL-STD-202G (Table 107-II).
3.3. Published Materials
• No informative references are applicable.
5. Equipement
• Keysight 34420A Micro-Ohm Meter or equivalent.
• Four wire test leads as required.
• Thermal chamber capable of maintaining 68°F (20°C)
. Procedure
1. Strip approximately 1 inch (2.54 cm) of the insulation exposing the inner conductor on both ends of the cable under test. Also, expose enough outer conductor or braid to make a good connection with the test leads. Cables tested on a reel must be constructed with outer jacket insulation.
2. Calibrate the micro-ohm meter by connecting the leads together and performing the appropriate trim or calibration as required by the manufacturer.
3. Connect the measurement leads, see Error! Reference source not found., one lead to the center conductor on one end of the cable, and the other lead directly to the same conductor on the opposite end. Measure DC resistance. Record this value as R cc .
4. Following the same procedure connect one test lead to the outer conductor of the cable, and the other directly to the same conductor on the opposite end. Measure DC resistance. Record this value as R oc .
5. After both conductors of the cable have been measured, determine temperature of test in degrees F.
Note: Cable should stabilize in its environment for 24 hours.ANSI SCTE 44 pdf download.