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The 7CT1N is a [[curve tracer]] plug-in for [[7000-series scopes]].
{{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.


==Specifications==
It can be installed in either a vertical or a horizontal compartment, a front-panel switch must be set accordingly. 
* peak DUT power 500 mW
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.


==Manuals==
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.


* [http://bama.edebris.com/download/tek/7ct1n/tek-7ct1n.pdf Tektronix 7CT1N Manual (PDF)]
The amplifier for the current axis can be switched into a ÷1000 mode to detect leakage currents (of typical 1970s semiconductors, anyway).
* [http://w140.com/smb/7ct1n_sm.pdf Tektronix 7CT1N Manual (OCR, PDF)]
 
{{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}}


* [http://amplifier.cd/Test_Equipment/Tektronix/Tektronix_7000_series_special/7CT1N_curve_tracer.htm Tek 7CT1N page at amplifier.cd]
==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,
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 (100 uF, 25V)have a tendency to leak or short, causing associated resistors R30 and R32 (240, .25W, 5%) to overheat and fail. A good preventative 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==
{| 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>
Image:7CT1N_inside.jpg
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>


__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:Specifications needed]]
[[Category:Curve tracers]]
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