View source for 7CT1N

{{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== 
* [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==
See [[7CT1N/Repairs]].

==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==

<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>

'''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:Curve tracers]]