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.
The 7704A SMPS uses a custom Tek chip 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.
|Fastest cal. sweep||2 ns/Div|
|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)|
7704A + 7D01 (from advertisement)