ANSI SCTE 33-2016 pdf free download – Test Method for Diameter of Drop Cable.
1.1. Determine characteristics
To determine one or more of the following characteristics relating to flexible coaxial drop cables. This method is intended to make use of relatively inexpensive equipment. For more precise methods using laser micrometers and the like see ANSI/SCTE 31 2007.
• Cable jacket outside diameter
• Average core diameter over foil
• Center conductor diameter
• Ovality
1.2. Measurement methods
Measurement methods for determining any subtle differences in cables, which may affect fitting installation or performance, cable performance or to be used as a starting point for fitting design.
2. Normative References
The following documents contain provisions, which, through reference in this text, constitute provisions of the standard. At the time of Subcommittee approval, the editions indicated were valid. All standards are subject to revision; and while parties to any agreement based on this standard 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 may not be compatible with the referenced version.
• ANSI/SCTE 31 2007, Test Method for Measuring Diameter Over Core
3. Informative References
The following documents may provide valuable information to the reader but are not required when complying with this standard.
• None are applicable.
5. Equipment
5.1. Gage
Dial thickness gage Mitutoyo C125EB, Starrett 1015BZ, Spi 24-361-8 or equivalent having the dial calibrated to read in .0005 inch increments, with a 0-1.000 inch travel and a spring-loaded plunger.
5.2. Micrometer
Machinist’s outside micrometer having flat surfaces, both on the anvil and the end of the spindle and calibrated to read directly to at least .001 inches with each division of a width that facilitates estimation of each measurement to .0001 inch.
6. Test Samples
6.1. Sample cut
Cut the cable samples approximately two inches long for measurements using the dial thickness gage.
Note: If a longer sample is used, the weight of the sample may result in erroneous measurements.
6.2. Core diameter
For measurements of the core diameter refer to ANSI/SCTE 31 2007.
6.3. Center conductor
Using a sharp utility knife cut approximately /2 inch of jacket, braid and dielectric from each end of thesample for measurement of the center conductor diameter.
7.Measurements
7.1. Cable jacket
Due to the softness of the cable jacket and the uneven foil tape, these methods are somewhat subjectiveand care must be taken when making measurements of this kind.
7.2. Sample
Prepare samples per section 6.1.
7.3. Zero out gage
Make sure the dial indicator on the dial thickness gage is at zero with the anvils completely closed.
Perform the necessary adjustments to zero the gage.Hold the dial thickness gage in one hand and use thethumb lever to open the anvils. Place the center of the sample between the anvils and release the thumblever. Without your hands being on the sample,find and record the minimum diameter reading.From theminimum reading, repeat the measurements five times around the circumference of the sample also recording the maximum. Average the six recorded readings to calculate the average diameter of the cable.Messenger cables may use only five total measurements.
7.4. Diameter
The diameter over the dielectric and foil may be measured using the method described in ANSISCTE 312007.
Note: By definition, D is the diameter of the dielectric core before the application of any foil.
Calculations of braid coverage are based on D and not the diameter over the core and foil. However, forthis test procedure core diameter includes the bonded foil.This is because there is extreme difficulty inremoving the foil (which is heavily bonded to the dielectric core) which makes the normal measurementimpractical.
7.5. Outside micrometer
Prepare the samples per 6.3; then using the outside micrometer, measure and record the diameter of thecenter conductor.
8.Ovality
Ovality is defined, using the measurements of outside diameter (OD), as ODmax – ODmin.ANSI SCTE 33 pdf download.