7CT1N: Difference between revisions

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{{Plugin Sidebar 2 |
{{Plugin Sidebar
title=Tektronix 7CT1N |
|manufacturer=Tektronix
summary=Curve tracer plug-in |
|series=7000-series scopes
image=tek-7ct1n-front.jpg |  
|type=7CT1N
caption=Tektronix 7CT1N |
|summary=Curve tracer plug-in
introduced=1971 |
|image=tek-7ct1n-front.jpg
discontinued=1990 |
|caption=Tektronix 7CT1N
series=[[7000-series scopes]]|
|introduced=1971
manuals=
|discontinued=1990
* [http://bama.edebris.com/download/tek/7ct1n/tek-7ct1n.pdf Tektronix 7CT1N Manual (PDF)]
|designers=Matt Zimmerman
* [http://w140.com/smb/7ct1n_sm.pdf Tektronix 7CT1N Manual (OCR, PDF)]
|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.
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.   
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  
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.
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
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.
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 x1000 mode
 
to detect leakage currents (of typical 1970s semiconductors, anyway).
The amplifier for the current axis can be switched into a ÷1000 mode to detect leakage currents (of typical 1970s semiconductors, anyway).


{{BeginSpecs}}
{{BeginSpecs}}
{{Spec | DUT drive voltage (C-E) |  
{{Spec | DUT drive voltage (C-E) |  
* positive (NPN or N channel) or negative (PNP or P channel) half-waves
* positive (NPN or N-channel) or negative (PNP or P-channel) half-waves
* 7.5 V, 0.5 V/Div, 240 mA peak
* 7.5 V, 0.5 V/div, 240 mA peak
* 30 V, 2 V/Div, 60 mA peak
* 30 V, 2 V/div, 60 mA peak
* 75 V, 5 V/Div, 24 mA peak
* 75 V, 5 V/div, 24 mA peak
* 300 V, 20 V/Div, 6 mA peak
* 300 V, 20 V/div, 6 mA peak
* HV warning light on for > 50 V
* HV warning light on for > 50 V
* peak power 500 mW}}
* peak power 500 mW}}
{{Spec | DUT current display  |  
{{Spec | DUT current display  |  
* 10 μA/Div to 20 mA/Div, 1-2-5 steps (x 1 mode)
* 10 μA/div to 20 mA/div, 1−2−5 steps (×1 mode)
* 10 nA/Div to 20 μA/Div, 1-2-5 steps (x 1000 mode)}}  
* 10 nA/div to 20 μA/div, 1−2−5 steps (÷1000 mode)}}  
{{Spec | Base/Gate drive |  
{{Spec | Base/Gate drive |  
* 0 to at least 10 steps
* 0 to at least 10 steps
* dual polarity
* dual polarity
* variable offset, at least +/- 5 steps
* variable offset, at least +/− 5 steps
* current mode: 1 μA/Step to 1 mA/Step in 1-2-5 sequence
* 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
* 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 connection | Three 4 mm jacks / binding posts}}
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==Links==  
==Links==  
* [http://w140.com/tekscope_scans/Indiv_Issue_Scans/4-6_Nov_1972.pdf  Tekscope Vol. 4 No. 6, Nov 1972]
* [http://amplifier.cd/Test_Equipment/Tektronix/Tektronix_7000_series_special/7CT1N_curve_tracer.htm Tek 7CT1N @ amplifier.cd]
* [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]
* [http://www.barrytech.com/tektronix/tek7000/tek7ct1n.html Tek 7CT1N @ barrytech.com]
* [http://www.antiqueradios.com/forums/viewtopic.php?f=8&t=177192 A homebrew test adapter]
{{Documents|Link=7CT1N}}
{{Documents|Link=Curve tracers}}


==Common Problems==
==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,  
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.  
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.
C30 and C32 should be replaced with modern equivalents rated above 35 V.


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|-
|-
!Year
!Year
!Price
! 1971
!2015 value
! 1980
! 1990
|-
|-
| 1971
!Catalog Price
| align="right" | $400
| align="right" | $400
| align="right" | $2,320
| align="right" | $1,000
| align="right" | $2,100
|-
|-
| 1980
!In 2023 Dollars
| align="right" | $1,000  
| align="right" | $3,000
| align="right" | $2,870
| align="right" | $3,600
|-
| align="right" | $4,900
| 1990
| align="right" | $2,100
| align="right" | $3,790
|-
|-
|}
|}
Line 90: Line 93:


<gallery>
<gallery>
tek-7ct1n-front.jpg | 7CT1N front
tek-7ct1n-front.jpg           | 7CT1N front
tek-7ct1n-left.jpg | 7CT1N left side
tek-7ct1n-left.jpg             | 7CT1N left side (1979 date codes)
tek-7ct1n-right.jpg | 7CT1N right side
tek-7ct1n-right.jpg           | 7CT1N right side
7ct1n-bc337.jpg     | 7CT1N tracing a BC337
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>
 
'''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>
</gallery>


Latest revision as of 11:04, 29 January 2024

Tektronix 7CT1N
Curve tracer plug-in
Tektronix 7CT1N

Compatible with 7000-series scopes

Produced from 1971 to 1990

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

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)
  • 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 (×1 mode)
  • 10 nA/div to 20 μA/div, 1−2−5 steps (÷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/step to 1 V/step in 1−2−5 sequence (via 1 kΩ current limiting resistor)
DUT connection Three 4 mm jacks / binding posts
DUT adapters

Links

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
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 front

  • 7CT1N left side (1979 date codes)

    7CT1N left side (1979 date codes)

  • 7CT1N right side

    7CT1N right side

  • 7CT1N LHS (1984 date codes)

    7CT1N LHS (1984 date codes)

  • 7CT1N RHS '84

    7CT1N RHS '84

Measurements

  • home-made A/B adapter

    home-made A/B adapter

  • home-made A/B adapter, rear

    home-made A/B adapter, rear

  • home-made A/B adapter used to compare two transistors

    home-made A/B adapter used to compare two transistors

  • Another home-made adapter (see this thread)

    Another home-made adapter (see this thread)

  • 7CT1N tracing a no-name optocoupler

    7CT1N tracing a no-name optocoupler

  • 7CT1N tracing a BC337 NPN Si transistor

    7CT1N tracing a BC337 NPN Si transistor

  • 10 mA tunnel diode. 7A13 is set to 10 mV/div for ×10 horizontal expansion.

    10 mA tunnel diode. 7A13 is set to 10 mV/div for ×10 horizontal expansion.

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