7854: Difference between revisions

Revision as of 20:06, 10 July 2019

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400 MHz waveform-processing scope

Produced from 1980 to 1990

Manuals

(All manuals in PDF format unless noted otherwise)

Manuals – Specifications – Links – Pictures

The Tektronix 7854 Waveform Processing Oscilloscope, introduced in 1980, is a 400 MHz combined analog / digital mainframe in the 7000 series that takes two vertical and two horizontal 7000-series plug-ins. In addition to a conventional analog (real time) scope, it contains an equivalent-time sampling 10-bit digitizer and a programmable waveform processor with GPIB interface. The project manager for the 7854 was Tom Rousseau.

The waveform processor can be programmed using a detachable calculator-style keyboard, using postfix operators ("reverse Polish notation" like HP calculators) that operate on entire waveforms, not just individual numbers.

Key Specifications

Bandwidth	(analog) 400 MHz
Fastest cal. sweep	500 ps
Sample rate	500 kHz (stores repetitive waveforms up to 400 MHz)
Resolution	10 bit
Acquisition depth	128, 256, 512 or 1024 points
Memory capacity	2048 waveform points in up to 16 waveforms (optional expansion to 5120 points and 40 waveforms)
Single shot	events and pretrigger up to 50 µs/div ("2.5 µs/point") with the 7B87 Time Base
CRT	154-0644-05, P-31, or 154-0893-09, P-11
Features	Signal Averaging Cursor measurements Waveform parameter measurements GPIB Interface (Standard) Waveform calculation operators - add, multiply, square root, log, abs Internal RPN programming language (Reverse Polish Notation) Keystroke Programming (Up to 2000 Keystrokes with Option 2D) programmable text display on screen

Internals

The acquisition system uses what Tektronix termed a "display-oriented random sampling digitizing technique". It simultaneously digitizes a pair of X and Y signal values at a rate of 3.5 µs/point, using Schottky diode bridge based sample/hold circuits and a single 10-bit successive-approximation ADC. The Y sample value is then written into the memory location addressed by the X value, using DMA.

The CPU in the 7854 is a Texas Instruments TMS9900 16-bit microprocessor, known from the infamous TI-99/4 home computer of the late 70s, with 32+6KByte ROM and 8KByte RAM.

Software

Prices

Year	1981	1990
Catalog price	$10,500	$17,000
2019 value	$29,360	$33,060

Links

Pictures

Tektronix 7854 with Waveform Calculator keyboard, 7A26, 7M13, 7D15, 7B87
Waveform Calculator Keyboard
Digital section in the 7854
A18 Vertical Amp Board
A17 Horizontal Amp Board
Rear
A32
A19 Vertical Channel Switch
A21 Z-Axis
A15 Signal Output
A15 Signal Output
A2 Mode Switch
A15 Signal Out Board
A28 RAM Board
A26 Control Logic Board
A26 Control Logic Board
A19 Vertical Channel Switch
A30 GPIB
A7 Aux Reg
A25 Digitizer
A11 Main Interface
A2 Mode Switch
A28 RAM Board with option 2D (RAM Expansion)
A27 MPU
A20 High Voltage

@@ Line 90: / Line 90: @@
 Tek_7854_keyboard.jpg|Waveform Calculator Keyboard
 Tek7854 digital boards.jpg | Digital section in the 7854
-Tek 7854 vertical amp.jpg|7854 Vertical Amp Board
+Tek 7854 vertical amp.jpg|A18 Vertical Amp Board
-Tek 7854 horizontal amp.jpg|7854 Horizontal Amp Board
+Tek 7854 horizontal amp.jpg|A17 Horizontal Amp Board
 Tek 7854 rear.jpg|Rear
 Tek 7854 a32.jpg|A32
-Tek 7854 a19.jpg|A19
+Tek 7854 a19.jpg|A19 Vertical Channel Switch
 Tek 7854 t1.jpg|A21 Z-Axis
-Tek 7854 a15b.jpg|A15
+Tek 7854 a15b.jpg|A15 Signal Output
-Tek 7854 a15.jpg|A15
+Tek 7854 a15.jpg|A15 Signal Output
-Tek 7854 a2.jpg|A2
+Tek 7854 a2.jpg|A2 Mode Switch
-Tek 7854 signal out board.jpg|Signal Out Board
+Tek 7854 signal out board.jpg|A15 Signal Out Board
-Tek 7854 a28.jpg|A28
+Tek 7854 a28.jpg|A28 RAM Board
 Tek 7854 a26.jpg |A26 Control Logic Board
 Tek 7854 logic.jpg|A26 Control Logic Board
-Tek 7854 vertical switching.jpg|Vertical Switching
+Tek 7854 vertical switching.jpg|A19 Vertical Channel Switch
 Tek 7854 gpib.jpg|A30 GPIB
-Tek 7854 aux reg.jpg|Aux Reg
+Tek 7854 aux reg.jpg|A7 Aux Reg
 Tek 7854 digitizer.jpg|A25 Digitizer
-Tek 7854 main interface.jpg|Main Interface
+Tek 7854 main interface.jpg|A11 Main Interface
-Tek 7854 mode switch.jpg|Mode Switch
+Tek 7854 mode switch.jpg|A2 Mode Switch
-Tek 7854 ram expansion.jpg|A28 with option 2D (RAM Expansion)
+Tek 7854 ram expansion.jpg|A28 RAM Board with option 2D (RAM Expansion)
-Tek 7854 mpu.jpg|MPU
+Tek 7854 mpu.jpg|A27 MPU
-Tek 7854 hv.jpg|HV
+Tek 7854 hv.jpg|A20 High Voltage
 Tek 7854 trace1.jpg
 Tek 7854 trace2.jpg