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
Tekscope 1972 V4 N6 Nov 1972.pdf Article Oscilloscope to Curve Tracer with One Plug-in Matt Zimmerman 1972
7000 series brochure March 1973.pdf Brochure 7000 series brochure, March 1973 1973
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.

Prices

Year 1971 1980 1990
Catalog Price $400 $1,000 $2,100
In 2023 Dollars $3,000 $3,600 $4,900

Pictures

Measurements