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{{Oscilloscope Sidebar | | {{Oscilloscope Sidebar | ||
|manufacturer=Tektronix | |||
summary=20 MHz dual trace analog scope | | |series=2200-series scopes | ||
image=Tek 2205 photo.jpg | | |model=2205 | ||
caption=Tek 2205 | | |summary=20 MHz dual trace analog scope | ||
introduced=1989 | | |image=Tek 2205 photo.jpg | ||
discontinued=1993 | | |caption=Tek 2205 | ||
manuals= | |introduced=1989 | ||
|discontinued=1993 | |||
|designers= | |||
|manuals= | |||
* [[Media:070-6717-00.pdf|Tektronix 2205 Operators Manual]] (bad-OCR) | |||
* [[Media:070-6716-00.pdf|Tektronix 2205 Service Manual]] (bad-OCR) | |||
* ''2205-40 manual needed [[Category:Manual needed]]'' | |||
<!-- | |||
* [http://w140.com/tek_2205.pdf Tektronix 2205 Service Manual (PDF)] | * [http://w140.com/tek_2205.pdf Tektronix 2205 Service Manual (PDF)] | ||
* [http://w140.com/tek_2205_operators.pdf Tektronix 2205 Operators Manual (PDF)] | * [http://w140.com/tek_2205_operators.pdf Tektronix 2205 Operators Manual (PDF)] | ||
--> | |||
}} | }} | ||
The '''Tektronix 2205''' is a 20 MHz dual-trace analog oscilloscope. | The '''Tektronix 2205''' is a 20 MHz dual-trace analog oscilloscope [[introduced in 1989]]. There is a also a 40 MHz version, the '''2205-40'''. | ||
{{BeginSpecs}} | |||
{{Spec | Bandwidth | 20 MHz }} | |||
{{Spec | CRT | 1.8 kV cathode voltage, no post-deflection acceleration }} | |||
{{Spec | Weight | 6.2 kg (13.7 lb) }} | |||
{{Spec | Power | max. 40 W }} | |||
{{EndSpecs}} | |||
''please expand'' | |||
==Prices== | |||
* 1990: $695 (~$1,600 in 2023 dollars) | |||
==Internals== | |||
Each of the two inputs first goes through attenuators, then discrete dual-JFET source-follower buffer stage, then an Intersil CA3102 differential amplifier chip to provide some gain and convert from single-ended to a differential signal. | |||
The vertical output amplifier driving the CRT is discrete and has an interesting design that conserves power (and minimizes heat). | |||
When the output is slewing at low rates, the output transistors have a constant, relatively low current passing through them. | |||
At higher slew rates, to provide enough current to charge and discharge the parasitic and CRT plate capacitances, the output stage operates in more of a push-pull mode. | |||
The 2205 has a switch-mode power supply that produces low voltage and CRT voltages using transformer T901, which operates at about 60 kHz. | |||
Interestingly, there is a also a mains-frequency step-down and isolation transformer (T901) in the power path before the SMPS. | |||
==Pictures== | ==Pictures== |