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Tektronix 5CT1N
Curve tracer plug-in
5CT1N curve tracer

Compatible with 5000-series scopes

Produced from 1972 to 1988

(All manuals in PDF format unless noted otherwise)
Manuals – Specifications – Links – Pictures

The Tektronix 5CT1N is a curve tracer plug-in for the 5000 series oscilloscopes, similar to the 7CT1N for 7000-series scopes. The 5CT1N was designed by Matt Zimmerman.

Key Specifications

DUT drive voltage (C-E)
  • positive (NPN or N channel) or negative (PNP or P channel) half-waves
  • 7.5 V, 0.5 V/Div, 240 mA peak
  • 30 V, 2 V/Div, 60 mA peak
  • 75 V, 5 V/Div, 24 mA peak
  • 300 V, 20 V/Div, 6 mA peak
  • HV warning light on for > 50 V
  • peak power 500 mW
DUT current display
  • 10 μA/Div to 20 mA/Div, 1−2−5 steps (x 1 mode)
  • 10 nA/Div to 20 μA/Div, 1−2−5 steps (x 1000 mode)
Base/Gate drive
  • 0 to at least 10 steps
  • dual polarity
  • variable offset, at least +/− 5 steps
  • current mode: 1 μA/Step to 1 mA/Step in 1−2−5 sequence
  • voltage mode: 1 mV/Div to 1 V/Div in 1−2−5 sequence, 1 kΩ current limit
DUT connection Three 4 mm jacks / binding posts
DUT adapters


Documents Referencing 5CT1N

Document Class Title Authors Year Links
Tekscope 1971 V3 N5 Sep 1971.pdf Article New Products 1971
Tekscope 1972 V4 N6 Nov 1972.pdf Article Oscilloscope to Curve Tracer with One Plug-in Matt Zimmerman 1972
48W-3346-3.pdf Brochure Making the Correct Semiconductor Measurements Time After Time 1982

Documents Referencing Curve tracers

Document Class Title Authors Year Links
062-1009-00.pdf Book Measurement Concepts: Semiconductor Device Measurements John Mulvey 1969
Tekscope 1969 V1 N1 Feb 1969.pdf Article Curve Tracing Displays 1969
Tekscope 1969 V1 N5 Oct 1969.pdf Article Troubleshooting the Sweep Ciruits Charles Phillips 1969
Tekscope 1972 V4 N3 May 1972.pdf Article Semiautomatic Testing with the Curve Tracer Jack Millay 1972
Tektronix Curve Tracers - Device Testing Techniques.pdf Book Tektronix Curve Tracers - Device Testing Techniques 1985


Common Problems

C30 and C32 (100 μF, 25 V) are under-rated and therefore have a tendency to leak or short, causing associated resistors R30 and R32 (240 Ω, 0.25 W, 5%) to overheat and fail. C30 and C32 should be replaced with modern equivalents rated above 35 V.