7CT1N: Difference between revisions
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The 7CT1N is a [[ | {{Plugin Sidebar | ||
|manufacturer=Tektronix | |||
|series=7000-series scopes | |||
|type=7CT1N | |||
|summary=Curve tracer plug-in | |||
|image=tek-7ct1n-front.jpg | |||
|caption=Tektronix 7CT1N | |||
|introduced=1971 | |||
|discontinued=1990 | |||
|designers=Matt Zimmerman | |||
|manuals= | |||
* [[Media:070-1247-00.pdf|Tektronix 7CT1N Manual]] (OCR) | |||
* [[Media:062-1009-00.pdf|Semiconductor Device Measurements]] (''Concepts'' series) | |||
* [[Media:7CT1N Product Modification Summary.pdf|7CT1N Product Modification Summary]] | |||
}} | |||
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). | ||
* | |||
{{BeginSpecs}} | |||
{{Spec | 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}} | |||
{{Spec | DUT current display | | |||
* 10 μA/div to 20 mA/div, 1−2−5 steps (×1 mode) | |||
* 10 nA/div to 20 μA/div, 1−2−5 steps (÷1000 mode)}} | |||
{{Spec | 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/step to 1 V/step in 1−2−5 sequence (via 1 kΩ current limiting resistor) | |||
}} | |||
{{Spec | DUT connection | Three 4 mm jacks / binding posts}} | |||
{{Spec | 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 | |||
}} | |||
{{EndSpecs}} | |||
==Links== | ==Links== | ||
* [http://amplifier.cd/Test_Equipment/Tektronix/Tektronix_7000_series_special/7CT1N_curve_tracer.htm Tek 7CT1N @ amplifier.cd] | |||
* [http://www.antiqueradios.com/forums/viewtopic.php?f=8&t=177192 A homebrew test adapter] | |||
* [[Dennis Tillman]]: ''[http://www.ke5fx.com/A_VTCT_Adapter_for_All_Tektronix_SCTs_W7PF.pdf An Inexpensive Vacuum Tube Curve Tracer Adapter for All Tektronix Semiconductor Curve Tracers]'' | |||
* [http://www.barrytech.com/tektronix/tek7000/tek7ct1n.html Tek 7CT1N @ barrytech.com] | |||
{{Documents|Link=7CT1N}} | |||
{{Documents|Link=Curve tracers}} | |||
==Common Problems== | |||
C30 and C32 (100 μF, 25 V) [http://hakanh.com/dl/docs/hardtofind/CT1N.pdf 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== | |||
{| class="wikitable" | |||
|- | |||
!Year | |||
! 1971 | |||
! 1980 | |||
! 1990 | |||
|- | |||
!Catalog Price | |||
| align="right" | $400 | |||
| align="right" | $1,000 | |||
| align="right" | $2,100 | |||
|- | |||
!In 2023 Dollars | |||
| align="right" | $3,000 | |||
| align="right" | $3,600 | |||
| align="right" | $4,900 | |||
|- | |||
|} | |||
==Pictures== | ==Pictures== | ||
<gallery> | <gallery> | ||
tek-7ct1n-front.jpg | 7CT1N front | |||
tek-7ct1n-left.jpg | 7CT1N left side (1979 date codes) | |||
tek-7ct1n-right.jpg | 7CT1N right side | |||
7CT1N LHS 670-1933-01 1984.jpg | 7CT1N LHS (1984 date codes) | |||
7CT1N RHS 670-1933-01 1984.jpg | 7CT1N RHS '84 | |||
Tek 7ct1n schematic2.png | |||
5CT1N 7CT1N Basic Measurement Reference Chart.jpg | |||
</gallery> | </gallery> | ||
'''Measurements''' | |||
<gallery> | |||
7CT1 homemade AB adapter 1.jpg | home-made A/B adapter | |||
7CT1 homemade AB adapter 2.jpg | home-made A/B adapter, rear | |||
7CT1 homemade AB adapter 3.jpg | home-made A/B adapter used to compare two transistors | |||
Home-made 3-pin curve tracer adapter.jpg | Another home-made adapter (see [http://www.antiqueradios.com/forums/viewtopic.php?f=8&t=177192 this thread]) | |||
7CT1N_optocoupler.jpg | 7CT1N tracing a no-name optocoupler | |||
7ct1n-bc337.jpg | 7CT1N tracing a BC337 NPN Si transistor | |||
Tek 7ct1n trace.jpg | |||
Tek 7ct1n td.jpg | 10 mA tunnel diode. 7A13 is set to 10 mV/div for ×10 horizontal expansion. | |||
</gallery> | |||
[[Category: | [[Category:7000 series special-function plugins]] | ||
[[Category:Curve tracers]] |
Latest revision as of 11:04, 29 January 2024
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) |
|
---|---|
DUT current display |
|
Base/Gate drive |
|
DUT connection | Three 4 mm jacks / binding posts |
DUT adapters |
|
Links
- 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
Documents Referencing 7CT1N
Document | Class | Title | Authors | Year | Links |
---|---|---|---|---|---|
Tekscope 1971 V3 N5 Sep 1971.pdf | Article | New Products | 1971 | 7L12 • 7CT1N • 5103N • 5A13N • 5A14N • 5A22N • 5CT1N • 172 • 1501 • P6056 • P6057 • 603 • 604 • 4602 • S-3160 | |
Tekscope 1972 V4 N6 Nov 1972.pdf | Article | Oscilloscope to Curve Tracer with One Plug-in | Matt Zimmerman | 1972 | 5CT1N • 7CT1N |
7000 series brochure March 1973.pdf | Brochure | 7000 series brochure, March 1973 | 1973 | 7A11 • 7A12 • 7A13 • 7A14 • 7A15A • 7A16A • 7A17 • 7A18 • 7A19 • 7A21N • 7A22 • 7B50 • 7B53A • 7B70 • 7B71 • 7B92 • 7CT1N • 7D11 • 7D13 • 7D14 • 7D15 • 7M11 • 7L12 • 7S11 • 7S12 • 7T11 • 7704A • R7704 • 7904 • R7903 • 7603 • R7603 • 7403N • R7403N • 7313 • R7313 • 7613 • R7613 • 7623 • R7623 • P7001 | |
48W-3346-3.pdf | Brochure | Making the Correct Semiconductor Measurements Time After Time | 1982 | 576 • 172 • 176 • 577 • 178 • 5CT1N • 7CT1N |
Documents Referencing Curve tracers
Document | Class | Title | Authors | Year | Links |
---|---|---|---|---|---|
062-1009-00.pdf | Book | Measurement Concepts: Semiconductor Device Measurements | John Mulvey | 1969 | Curve tracers • Tunnel diodes |
Tekscope 1969 V1 N1 Feb 1969.pdf | Article | Curve Tracing Displays | 1969 | Curve tracers • 576 | |
Tekscope 1969 V1 N5 Oct 1969.pdf | Article | Troubleshooting the Sweep Ciruits | Charles Phillips | 1969 | 575 • 576 • Curve tracers |
Tekscope 1972 V4 N3 May 1972.pdf | Article | Semiautomatic Testing with the Curve Tracer | Jack Millay | 1972 | 576 • 172 • Curve tracers |
Tektronix Curve Tracers - Device Testing Techniques.pdf | Book | Tektronix Curve Tracers - Device Testing Techniques | 1985 | Curve tracers • Tunnel diodes |
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
-
7CT1N front
-
7CT1N left side (1979 date codes)
-
7CT1N right side
-
7CT1N LHS (1984 date codes)
-
7CT1N RHS '84
-
-
Measurements
-
home-made A/B adapter
-
home-made A/B adapter, rear
-
home-made A/B adapter used to compare two transistors
-
Another home-made adapter (see this thread)
-
7CT1N tracing a no-name optocoupler
-
7CT1N tracing a BC337 NPN Si transistor
-
-
10 mA tunnel diode. 7A13 is set to 10 mV/div for ×10 horizontal expansion.