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2205: Difference between revisions
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The Tektronix 2205 is a 20MHz 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 a T901, which operates at about 60kHz. | |||
Interestingly, there is a also a mains-frequency | |||
isolation transformer (T901) in the power path before the SMPS. | |||
The 2205 weighs 13.7 pounds and consumes a maximum of 40 watts. | |||
* [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)] | ||