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The Tektronix 1503 is a sinusoidal TDR cable tester with a similar design to the 1502B/C step-pulse TDR's.
The 1503 transmits a 5 V half-sine pulse of selectable duration, allowing an operator to examine up to 50,000 feet of cable.
- Tektronix 1503 Manual (PDF)
- Tektronix 1503C User Manual (PDF)
- Watertight Sealing Procedures for 1502/1503 TDRs (PDF, needs OCR)