7704A: Difference between revisions
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==Internals== | ==Internals== | ||
The vertical amplifier in the 7704A uses the [[155-0077-00]] hybrid. | The vertical amplifier in the 7704A uses the [[155-0077-00]] hybrid. | ||
In the 7704A, the [[7000 series readout system|readout board]] is located behind a back panel carrying two [[LEMO S-series connector]]s for probe power. This placement was intended to allow easy retrofitting of a readout board into an Option 01 instrument, however, the readout board is not a plug-in card − several cables have to be attached to the board. | |||
The 7704A SMPS uses a custom Tek chip ([[155-0067-02]]) to implement the control functions. Since the SMPS is a kind of oscillator, there is the issue of how it will start when it is first powered up. Early 7704As use a diac in the starter circuit. Later 7704As use a unijunction transistor in the starter circuit. | The 7704A SMPS uses a custom Tek chip ([[155-0067-02]]) to implement the control functions. Since the SMPS is a kind of oscillator, there is the issue of how it will start when it is first powered up. Early 7704As use a diac in the starter circuit. Later 7704As use a unijunction transistor in the starter circuit. |
Revision as of 23:18, 9 April 2018
The Tektronix 7704A is a modular oscilloscope in the 7000 series that takes two 7000-series vertical plug-ins and two 7000-series horizontal plug-ins.
The 7704A followed the 7704, improving bandwidth to 200 MHz (regular model, optimized for transient response) or 250 MHz (option 9, bandwidth-optimized). The R7704 rack-mount version continued to be named just R7704.
The 7704A has a special modular construction. At the bottom is the "acquisition unit", which contains the power supply, plug-in slots, and main interface board. On top is the "display unit", which contains the CRT, HV power supply, and output amplifiers for driving the deflection plates of the CRT. These units detach. A large multi-pin connector passes signals and power from the acquisition unit to the display unit. It is important not to damage this connector when assembling or disassembling the units.
An optional component, the P7001 Processing Unit, can be added to a 7704A between the acquisition unit and the display unit. The Acquisition Unit of the 7704A, the P7001 Processor, and the Display Unit of the 7704A are connected by the Acquisition-Processor-Display (APD) Interface shown below.
Key Specifications
Fastest cal. sweep | 2 ns/Div |
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Bandwidth | 200 MHz (with 7A19) |
Calibrator | 4 mV to 40 V in decade steps, 2/20/200/400 mV into 50 Ω, 40 mA; 1 kHz |
Outputs | Vertical Signal Out (25 mV/Div, 60 MHz), +Sawtooth, +Gate, Cal, camera power, probe power |
Acceleration voltage | 24 kV |
Power | 90-132 V or 180-264 V, 48-440 Hz, 180 W max. |
Weight | 13.6 kg (30 lbs) |
Size | 34.5 cm × 30.5 cm × 57.7 cm (H×W×L) |
Options |
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Internals
The vertical amplifier in the 7704A uses the 155-0077-00 hybrid.
In the 7704A, the readout board is located behind a back panel carrying two LEMO S-series connectors for probe power. This placement was intended to allow easy retrofitting of a readout board into an Option 01 instrument, however, the readout board is not a plug-in card − several cables have to be attached to the board.
The 7704A SMPS uses a custom Tek chip (155-0067-02) to implement the control functions. Since the SMPS is a kind of oscillator, there is the issue of how it will start when it is first powered up. Early 7704As use a diac in the starter circuit. Later 7704As use a unijunction transistor in the starter circuit.
Links
Pictures
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7704A
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7704A
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7704A + 7D01 (from advertisement)
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7704A picture from manual
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APD Interface
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Interconnect plug in normal position
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Interconnect plug on storage fixture
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7704A with P7001
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7704A rear
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7704A rear
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7704A rear
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7704A Mod 9 rise time with 7A29 is 1.25 ns. Sweep was adjusted for exactly 1 ns / div using 1 GHz reference.