2205: Difference between revisions

Revision as of 01:25, 11 August 2021

Tektronix 2205
20 MHz dual trace analog scope Tek 2205 Produced from 1989 to 1993 Manuals Tektronix 2205 Service Manual (PDF) Tektronix 2205 Operators Manual (PDF) Tektronix 2205 Service Manual (PDF, OCR, bad-OCR) Tektronix 2205 Operators Manual (PDF, OCR, bad-OCR) (All manuals in PDF format unless noted otherwise)

Manuals – Specifications – Links – Pictures

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.

Key Specifications

Bandwidth	20 MHz
CRT	1.8 kV cathode voltage, no post-deflection acceleration
Weight	6.2 kg (13.7 lb)
Power	max. 40 W

please expand

Prices

1990: $695 ($1440 in 2021 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

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@@ Line 15: / Line 15: @@
 * [[Media:070-6717-00.pdf|Tektronix 2205 Operators Manual (PDF, OCR, bad-OCR)]]
 }}
-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.
-Each of the two inputs first goes through attenuators,
+{{BeginSpecs}}
-then discrete dual-JFET source-follower buffer stage,
+{{Spec | Bandwidth | 20 MHz }}
-then an Intersil CA3102 differential amplifier chip to provide
+{{Spec | CRT | 1.8 kV cathode voltage, no post-deflection acceleration }}
-some gain and convert from single-ended to a differential signal.
+{{Spec | Weight | 6.2 kg (13.7 lb) }}
+{{Spec | Power | max. 40 W }}
+{{EndSpecs}}
+''please expand''
-The vertical output amplifier driving the CRT is discrete and has
+==Prices==
-an interesting design that conserves power (and minimizes heat).
+: $695 ($1440 in 2021 dollars)
-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.
+==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.
-There is a also a 40 MHz version called the 2205-40.
+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.
-==Prices==
+The 2205 has a switch-mode power supply that produces low voltage and CRT voltages using transformer T901, which operates at about 60 kHz.
-: $695
+Interestingly, there is a also a mains-frequency step-down and isolation transformer (T901) in the power path before the SMPS.
 ==Pictures==