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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 '''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://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) 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, .25W, 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.
A good preventive maintenance procedure would be to
replace these two capacitors with modern equivalents.
Three 7CT1N units purchased online had this fault,
and replacement of the capacitors and resistors restored proper operation.


==Prices==
==Prices==
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|-
|-
!Year
!Year
!Price
! 1971
!2015 value
! 1980
|-
! 1990
| 1971
| align="right" | $400
| align="right" | $2,320
|-
|-
| 1980
!Catalog Price
| align="right" | $1,000  
| align="right" | $400
| align="right" | $2,870
| align="right" | $1,000
| align="right" | $2,100
|-
|-
| 1990
!In 2023 Dollars
| align="right" | $2,100
| align="right" | $3,000
| align="right" | $3,790
| align="right" | $3,600
| align="right" | $4,900
|-
|-
|}
|}
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<gallery>
<gallery>
File:tek-7ct1n-front.jpg | 7CT1N front
tek-7ct1n-front.jpg           | 7CT1N front
File:tek-7ct1n-left.jpg | 7CT1N left side
tek-7ct1n-left.jpg             | 7CT1N left side (1979 date codes)
File:tek-7ct1n-right.jpg | 7CT1N right side
tek-7ct1n-right.jpg           | 7CT1N right side
File: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>
</gallery>


__NOTOC__
'''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:7000 series special-function plugins]]
[[Category:7000 series special-function plugins]]
[[Category:Curve tracers]]
[[Category:Curve tracers]]
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