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The Tektronix 2205 is a | {{Oscilloscope Sidebar | | ||
title=Tektronix 2205 | | |||
summary=20 MHz dual trace analog scope | | |||
image=Tek 2205 photo.jpg | | |||
caption=Tek 2205 | | |||
introduced=1988 | | |||
discontinued=(?) | | |||
manuals= | |||
* [http://w140.com/tek_2205.pdf Tektronix 2205 Service 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. | |||
Each of the two inputs first goes through attenuators, | Each of the two inputs first goes through attenuators, | ||
| Line 5: | Line 16: | ||
then an Intersil CA3102 differential amplifier chip to provide | then an Intersil CA3102 differential amplifier chip to provide | ||
some gain and convert from single-ended to a differential signal. | some gain and convert from single-ended to a differential signal. | ||
The vertical output amplifier driving the CRT is discrete and has | The vertical output amplifier driving the CRT is discrete and has | ||
an interesting design that conserves power (and minimizes heat). | an interesting design that conserves power (and minimizes heat). | ||
| Line 18: | Line 30: | ||
step-down and isolation transformer (T901) in the power path before the SMPS. | step-down and isolation transformer (T901) in the power path before the SMPS. | ||
The 2205 has 1.8 kV on the cathode and does not use post-deflection | |||
The 2205 has 1. | |||
acceleration of the CRT electron beam. | acceleration of the CRT electron beam. | ||
The 2205 weighs 13.7 pounds and consumes a maximum of 40 watts. | The 2205 weighs 13.7 pounds and consumes a maximum of 40 watts. | ||
==Pictures== | |||
<gallery> | <gallery> | ||
File:Tek 2205 photo.jpg | File:Tek 2205 photo.jpg | ||
Revision as of 08:12, 25 August 2014
The Tektronix 2205 is a 20 MHz dual-trace analog oscilloscope.
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 60kHz. Interestingly, there is a also a mains-frequency step-down and isolation transformer (T901) in the power path before the SMPS.
The 2205 has 1.8 kV on the cathode and does not use post-deflection acceleration of the CRT electron beam.
The 2205 weighs 13.7 pounds and consumes a maximum of 40 watts.