1502B
The Tektronix 1502B is a Time Domain Reflectometer.
It is commonly used to test coaxial cables, although they have many other uses.
Key Specifications
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Internals and version differences
The original 1502 (1975) used a CRT and was an almost completely analog design except for some discrete digital logic used to pre-fire and fire the tunnel diode pulser. The 1502B and its successor, the 1502C, used a liquid-crystal display and a Z80 microprocessor.
The other major difference between versions is the line charging method. The 1502 uses a fast (36 ps) tunnel diode pulser, the later models used a half sine wave to charge the line. The TD pulser, with its Dirac delta edge, gives much better short range sensitivity, although it is much easier to destroy.
Replacement
MOHR Test and Measurement manufactures a direct replacement to the 1502B and 1502C using an updated version of the same pulser/sampler. Any procedures or recorded waveforms are repeatable using the MOHR TDR.CT100B TDR Cable Analyzer.
Links
Documents Referencing 1502B
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Pictures
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Components
Some Parts Used in the 1502B
| Part | Part Number(s) | Class | Description | Used in |
|---|---|---|---|---|
| SG3524 | 156-0933-00 • 156-0933-01 • 156-1585-00 • 156-1585-01 | Monolithic integrated circuit | PWM switch-mode controller | 067-1011-00 • 1502B • 1502C • 1503B • 1503C • 7A42 • DP100 |