5CT1N

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	013-0072-00 Axial diodes 013-0069-00 Devices with long leads 013-0070-01 Transistors in TO-3 or TO-66 cases 013-0074-00 Transistors with stud leads 013-0110-00 Diodes with stud leads 013-0112-00 Transistors in TO-36 cases 013-0128-00 Transistors in TO-5 or TO-18

Links

• Matt Zimmerman, Oscilloscope to Curve Tracer with one Plug-in. Tekscope Vol. 4 No. 6, Nov 1972, p.7
• Dennis Tillman: An Inexpensive Vacuum Tube Curve Tracer Adapter for All Tektronix Semiconductor Curve Tracers

Pictures

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  5CT1N in 5440 mainframe vertical bay, X output connected to time base X input

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  Displaying transistor curves

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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.