Because there are different types of cable constructions and termination schemes, careful consideration must be given to the test method specified as each affects the data obtained in a unique manner. The following items should be included in the specification:
- Termination Scheme.
- Frequency (if applicable).
- Test Instrument (if applicable).
- Example: Impedance.
- Example: Single End
- Example: 10 KHz
- Example: TDR
Spec: Differential Impedance @ 1 MHz
Method: Network Analyzer - Open/Short Method using a balancing transformer (balun)
Reason: This is the method used to test impedance at a certain frequency.
Spec: Single End Impedance
Method: SCSI Method termination, single end TDR, one point measurement, 2-4 ns from beginning of sample.
Reason: This is the method proposed by the SCSI Committee