7CT1N: Difference between revisions
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!Year | !Year | ||
! | ! 1971 | ||
! | ! 1980 | ||
! 1990 | |||
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| | !Catalog Price | ||
| align="right" | $ | | align="right" | $400 | ||
| align="right" | $2, | | align="right" | $1,000 | ||
| align="right" | $2,100 | |||
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!In 2023 Dollars | |||
| align="right" | $ | | align="right" | $3,000 | ||
| align="right" | $3, | | align="right" | $3,600 | ||
| align="right" | $4,900 | |||
| align="right" | $4, | |||
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|} | |} |
Revision as of 02:39, 6 October 2023
The Tektronix 7CT1N is a curve tracer plug-in for 7000-series scopes. The 5CT1N plug-in for 5000-series scopes is very similar.
It can be installed in either a vertical or a horizontal compartment, a front-panel switch must be set accordingly. A pull-out cable with a plastic BNC plug connects to the input of a module installed in the corresponding plugin for the other axis, with a fixed 100 mV/Div scaling compatible with time base X inputs.
Internally, a variable-amplitude 55 Hz triangle-wave source supplies a transformer to step up the drive voltage and decouple it from ground (Emitter terminal). A step source supplies base current or gate voltage to the DUT.
The amplifier for the current axis can be switched into a ÷1000 mode to detect leakage currents (of typical 1970s semiconductors, anyway).
Key Specifications
DUT drive voltage (C-E) |
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DUT current display |
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Base/Gate drive |
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DUT connection | Three 4 mm jacks / binding posts |
DUT adapters |
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Links
- Matt Zimmerman, Oscilloscope to Curve Tracer with one Plug-in. In Tekscope Vol. 4 No. 6, Nov 1972.
- Tek 7CT1N @ amplifier.cd
- A homebrew test adapter
- Dennis Tillman: An Inexpensive Vacuum Tube Curve Tracer Adapter for All Tektronix Semiconductor Curve Tracers
- Tek 7CT1N @ barrytech.com
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.
Prices
Year | 1971 | 1980 | 1990 |
---|---|---|---|
Catalog Price | $400 | $1,000 | $2,100 |
In 2023 Dollars | $3,000 | $3,600 | $4,900 |
Pictures
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7CT1N front
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7CT1N left side (1979 date codes)
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7CT1N right side
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7CT1N LHS (1984 date codes)
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7CT1N RHS '84
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7CT1N tracing a BC337 NPN Si transistor
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10 mA tunnel diode. 7A13 is set to 10 mV/div for ×10 horizontal expansion.
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