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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. | |||
* [http:// | 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== | |||
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. | |||
==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]] | |||