7854: Difference between revisions
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'''Other Info''' | '''Other Info''' | ||
* [[Media:Tekniques 15Dec1980 vol4 no8 7854excerpt.pdf | 7854-Related Excerpt from Tekniques Vol 4 No 8 ]] | * [[Media:Tekniques 15Dec1980 vol4 no8 7854excerpt.pdf | 7854-Related Excerpt from Tekniques Vol 4 No 8 ]] | ||
* [[Media:Tek 7854 eis signature page.pdf | Tektronix 7854 Engineering Instrument Specification Signature Page ]] | * [[Media:Tek 7854 eis signature page.pdf | Tektronix 7854 Engineering Instrument Specification Signature Page ]] | ||
* [[Media:Tek_7854_42W5198_specs_orderinginfo.pdf | 7854 specifications and ordering information ]] | * [[Media:Tek_7854_42W5198_specs_orderinginfo.pdf | 7854 specifications and ordering information ]] | ||
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* [[Media:Tek 7854 board test procedures.pdf | Tektronix 7854 Board Test Procedures ]] | * [[Media:Tek 7854 board test procedures.pdf | Tektronix 7854 Board Test Procedures ]] | ||
* [[Media:Tek 7854 npi.pdf | Tektronix 7854 New Product Introduction Review ]] | * [[Media:Tek 7854 npi.pdf | Tektronix 7854 New Product Introduction Review ]] | ||
* [[Media:Dennis Tillman 7104-7854 SMPS Dummy Load.pdf | Dummy load for troubleshooting 7854 and 7104 SMPS (Dennis Tillman) ]] | |||
}} | }} | ||
The '''Tektronix 7854 Waveform Processing Oscilloscope''', introduced in 1980, is a 400 MHz combined analog / digital | The '''Tektronix 7854 Waveform Processing Oscilloscope''', introduced in 1980, is a 400 MHz combined analog / digital |
Revision as of 11:01, 29 January 2024
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. Single-shot, pretrigger acquisition is possible with the special 7B87 time base using real-time sampling. The project manager for the 7854 was Tom Rousseau. During early development, before it was given the name "7854", the product was referred to as the "Smart Scope", and the digital processing was called the "smarts".
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/Div |
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 (P31) or 154-0893-09 (P11); cathode −3 kV, anode +21 kV, distributed vertical deflection plates |
Features |
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Options |
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Power consumption | 230 W |
Weight | 42 lbs / 19 kg |
Documents
Documents Referencing 7854
Document | Class | Title | Authors | Year | Links |
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AX-4382.pdf | Application Note | WP1310 Waveform Processing System | 1980 | 7854 | |
AX-4425.pdf | Application Note | WP1310 Signal Processing System | 1980 | 7854 • 4052 • WP1310 | |
AX-4440.pdf | Application Note | 7854 On-board Digital Processing Refines Scope Measurements | Val Garuts • Jim Tallman | 1980 | 7854 |
Tek 7854-AN-SPSBasic.pdf | Article | Talking to the 7854 scope with TEK SPS BASIC. | Bob Ramirez | 1980 | 7854 |
Tekscope 1980 V12 N2.pdf | Article | New Products | 1980 | 7854 • 468 • AA501 • SG505 • CG551AP • 1900 • 7612D | |
Tekscope 1980 V12 N3.pdf | Article | Digital Waveform Processing in a High-Performance 7000-Series Oscilloscope | Tom Rousseau • Bill Cox | 1980 | 7854 |
42AX-4682.pdf | Application Note | Introduction to 7854 Oscilloscope Measurement and Programming Techniques | 1981 | 7854 | |
7854 Application Programs.pdf | Application Note | 7854 Application Programs | Mike Mraz • Gary Kirchberger • Clark Foley • Roger Loop | 1981 | 7854 |
AX-4281.pdf | Application Note | Measurement Variety. An Engineering Challenge Featuring the 7854 | 1981 | 7854 | |
AX-4864.pdf | Application Note | 7854 Waveform Calculator Keyboard Guide | 1981 | 7854 | |
42W-4416-1.pdf | Application Note | Using the 7854 in a GPIB configuration | 1982 | 7854 • GPIB | |
42W-5334.pdf | Application Note | Automated TDR Testing Made Easy with the 7854 Oscilloscope/7S12 Sampler Plug-In | 1983 | 7854 • 7S12 | |
42W-5700.pdf | Application Note | Power Supply/Device Testing | 1984 | 7854 | |
42W-5802.pdf | Application Note | Basic software programs for communicating between the 7854 and IBM PC | 1985 | 7854 | |
42W-6732.pdf | Application Note | TekMAP 7854 Time and Amplitude Measurement Software | 1987 | 7854 | |
42W-6767.pdf | Application Note | Tektronix 7854TDR and 7854MPS measurement packages | 1987 | 7854 |
Prices
Year | 1981 | 1984 | 1990 |
---|---|---|---|
Catalog price | $10,500 | $14,230 | $17,000 |
In 2023 Dollars | $35,500 | $42,000 | $39,900 |
Diagnostic Test Interfaces
- 067-0911-00 Diagnostic Test Interface
- 067-0912-00 Analog Test Card for 7854
- 067-0961-00 Diagnostic Memory Board
Extender Boards
- 067-0913-00 Extender Board 44-Pin (used with the A30-GPIB and A31-ROM Boards)
- 067-0914-00 Extender Board 80-Pin (used with the A27-MPU and A28-RAM Boards)
- 067-0915-00 Extender Board 124-Pin (used with the A26-Control Logic and A29-Display Boards)
Software
- Application Note 42W-5802, BASIC Software Programs for Communicating Between the 7854 and IBM PC, 1985 (OCR)
- 7854 software in BASIC
- FFT program
Links
- Talking to the 7854 Oscilloscope with TEK SPS BASIC in Handshake, Winter 1980/81
- Tek 7854 Design Team Note: The graduation cap on the Engineering Release cake (page 8) signifies that it is the "Smart Scope".
- Tek 7854 @ curiousmarc (with links to videos)
- Tek 7854 @ amplifier.cd
- 7854 ROMs, the whole story @ TekScopes groups.io
- Mostek ROM Repairs @ vintagetek.org
- overview of ROM repair options @ paulcarbone.com
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 sample/hold circuits based on Schottky diode bridges, 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 (direct memory access, i.e. bypassing the CPU).
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.
The firmware consists of mask ROMs, an FPLA, and patch EPROMs. These ROMs (particularly the early ones from Mostek) are a common point-of-failure. Several remedies exist, see the Repairs page.
Pictures
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7854 Rear, older version
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7854 Rear, older version, separate RAM and ROM boards, external battery backup, old-style, silent fan
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7854 Rear, newer version, combined RAM and ROM boards, internal battery backup, new-style, less silent fan
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7854 Top
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7854 Left
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7854 Right
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Waveform Calculator Keyboard
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Waveform Calculator Keyboard
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inside the Waveform Calculator Keyboard
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Digital section in the 7854
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A2 Mode Switch
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A2 Mode Switch
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The A7 / Auxiliary regulator
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A different revision of the A7 board
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A11 Main Interface
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A15 Signal Output
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A15 Signal Output
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A15 Signal Out Board
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A17 Horizontal Amp Board
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A18 Vertical Amp Board
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A19 Vertical Channel Switch
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A19 Vertical Channel Switch
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A20 High Voltage
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A21 Z-Axis
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A25 Digitizer
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A26 Control Logic Board
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A26 Control Logic Board
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A26 Control Logic Board
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A27 MPU
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A different revision of the A27 board
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A28 RAM Board
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A28 RAM Board with option 2D (RAM Expansion)
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A29 Display Board
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A30 / GPIB board
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A30 GPIB, different revision
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A31 ROM Board
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A32 Rear Panel Connector
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Picture of 7854 during development. Note the different measurement keyboard layout. Picture might date from late 1978
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Picture of designing the 7854 waveform calculator keyboard. note the different Keyboard layout.
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Alignment Pattern
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Program for generating Alignment Pattern
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Mainframe rise time measured with 067-0587-02
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7854 diagnostics system with MicroLab I
Memory Maps
Devices with separated ROM and RAM boards (SN < B100000)
Address Range | Size | ICs | Purpose | ||
---|---|---|---|---|---|
0000...3FFE | 8k | U100, U110 | ROM | ||
4000...7FFE | 8k | U200, U210 | ROM | ||
8000...8FFE | 2k | U300, U310 | PATCH ROM “for future use” | ||
9000...9FFE | 2k | U400,U410 | PATCH + ROM | ||
2k RAM | 4k RAM | 8k RAM | |||
A000...A7FE | 1k | U510,U520,U530,U540 | x | x | x |
A800...AFFE | 1k | U610,U620,U630,U640 | x | x | |
B000...B7FE | 1k | U710,U720,U730,U740 | x | ||
B800...BFFE | 1k | U810,U820,U830,U840 | x | ||
C000...C7FE | 1k | U110,U120,U130,U140 | x | ||
C800...CFFE | 1k | U210,U220,U230,U240 | x | ||
D000...D7FE | 1k | U310,U320,U330,U340 | x | x | |
D800...DFFE | 1k | U410,U420,U430,U440 | x | x | x |
E000...E37E | GPIB, Keyboards, Digitizer,... | ||||
E380...FFFE | Reserved for Diagnostic Interface |
Devices with combined RAM+ROM Board (SN >= B100000)
Address Range | Size | ICs | Purpose |
---|---|---|---|
0000...7FFE | 16k | U220,U320 | ROM |
8000...9FFE | 4k | U200,U300 | ROM for future use |
A000...DFFE | 8k | U400,U410 | RAM |
E000...E37E | 4k | GPIB, Keyboards, Digitizer,... | |
E380...FFFE | Reserved for Diagnostic Interface |
Devices with installed Diagnostic Boards (all serial numbers)
Address Range | Size | ICs | Purpose |
---|---|---|---|
0000...0FFE | 2k | U430,U330 | ROM |
1000...1FFE | 2k | U410,U310 | ROM |
2000...2FFE | 2k | U200,U100 | ROM |
3000...3FFE | 2k | U220,U120 | ROM |
4000...4FFE | 2k | U420,U320 | ROM |
5000...5FFE | 2k | U400,U300 | ROM |
6000...6FFE | 2K | U210,U110 | ROM |
7000...7FFE | 2K | ROM for future use | |
8000...7FFE | 4k | Not used | |
9800...9FFE | RAM in Microlab I, disabled when standard ROM is in 7854 | ||
A000...DFFE | 2...8k | RAM – see tables above | |
E000...E37E | GPIB, Keyboards, Digitizer,... | ||
E380...E39E | BKREGCS Breakpoint address register chip select | ||
E3A0...E3BE | CTREGCS control register chip select | ||
E3C0...E3DE | BKDATA breakpoint data latch | ||
E3E0 | F/P Display Data | ||
E3E2 | F/P Display Data | ||
E3E4 | F/P Keyboard Data | ||
E3E6 | F/P Keyboard flag reset | ||
E3E8 | Terminal I/O Control | ||
E3EA | Terminal I/O Data | ||
E3EC | Cassette I/O Control | ||
E3EE | Cassette I/O Data | ||
E3F0 | Modem I/O Control | ||
E3F2 | Modem I/O Data | ||
E3F4...E3FE | ONBDIO on board input/output to microlab I | ||
E400...E7FE | RAM in Microlab I | ||
E800...EFFE | U120,U225 | ROM - bank switched by PROMBK | |
F000...FFFE | U220,U320 | ROM - bank switched by PROMBK |
Components
Some Parts Used in the 7854
Part | Part Number(s) | Class | Description | Used in |
---|---|---|---|---|
154-0644-00 | 154-0644-00 • 154-0644-04 • 154-0644-05 • 154-0644-09 | CRT | CRT with distributed deflection plates | 7704A • 7854 • 7904 • 7904A • R7903 |
155-0009-00 | 155-0009-00 | Monolithic integrated circuit | horizontal lockout logic | 7504 • 7514 • 7704 • 7704A • R7704 • 7834 • 7844 • 7854 • 7904 • R7903 • 7904A • 7934 • 7104 |
155-0010-00 | 155-0010-00 | Monolithic integrated circuit | chop divider and blanking | 7504 • 7514 • 7704 • R7704 • 7704A • 7834 • 7854 • 7904 • R7903 • 7904A • 7934 • 7104 |
155-0011-00 | 155-0011-00 | Monolithic integrated circuit | clock and chop blanking | 485 • 7313 • 7403N • R7403N • 7503 • 7504 • 7514 • 7603 • AN/USM-281C • 7613 • 7623 • 7623A • 7633 • 7704 • R7704 • 7704A • 7834 • 7844 • 7854 • 7904 • 7904A • R7903 • R7912 • 7912AD • 7912HB • 7934 • 7104 • R7103 • AN/USM-281C |
155-0012-00 | 155-0012-00 | Monolithic integrated circuit | Z Axis Logic | 485 • 7504 • 7514 • 7704 • R7704 • 7704A • 7834 • 7844 • 7854 • 7904 • R7903 • 7904A • R7912 • 7934 • 7912AD • 7912HB • 7104 • R7103 |
155-0013-00 | 155-0013-00 • 155-0013-01 | Monolithic integrated circuit | horizontal chop and alt. binary | 7504 • 7514 • 7704 • R7704 • 7704A • 7834 • 7854 • 7904 • 7904A • R7903 • 7934 • 7104 |
155-0014-01 | 155-0014-00 • 155-0014-01 | Monolithic integrated circuit | analog-to-decimal converter | 7000 series readout system • 7854 • 7934 • 7J20 • 7L5 • P7001 |
155-0015-01 | 155-0015-00 • 155-0015-01 | Monolithic integrated circuit | analog data switch | 7000 series readout system • 7854 • 7934 |
155-0017-00 | 155-0017-00 | Monolithic integrated circuit | 5 MHz decade counter | 7000 series readout system • 7854 • 7934 |
155-0021-00 | 155-0021-00 • 155-0021-01 | Monolithic integrated circuit | timing generator | 7000 series readout system • 7854 • 7934 |
155-0022-00 | 155-0022-00 • 155-0022-01 | Monolithic integrated circuit | analog multiplexer | 147 • 148 • 149 • 335 • 468 • 1430 • 1441 • 1461 • 1900 • 1910 • 2220 • 2221 • 2230 • 5223 • 5403 • 5440 • 5441 • 5443 • 5444 • 5A38 • 7313 • 7403N • 7503 • 7504 • 7514 • 7603 • AN/USM-281C • 7613 • 7623 • 7623A • 7633 • 7704 • R7704 • 7704A • 7834 • 7844 • 7854 • R7912 • 7912AD • 7912HB • 7904 • R7903 • 7904A • 7934 • 7A12 • 7A18 • 7A18A • 7A18N • 7B52 • 7B53N • 7D10 • 7D11 • 7D12 • NT-7000 • P7001 |
155-0059-00 | 155-0059-00 | Monolithic integrated circuit | HF amplifier | 7834 • 7844 • 7854 • 7904 • R7903 • R7912 • 7912AD |
155-0064-00 | 155-0064-00 | Hybrid integrated circuit | vertical output amplifier | 7834 • 7854 • 7904 • R7903 • 7912AD • 485 • PG502 |
155-0067-02 | 155-0067-00 • 155-0067-02 • 155-0067-03 | Monolithic integrated circuit | SMPS controller | 7704A • 7834 • 7844 • 7854 • 7904 • R7903 • 7904 • 7904A • 7934 • R7912 • 7912AD • 7912HB • 7934 • 7104 • R7103 • 308 • 434 • 485 • 690 • P7001 |
155-0078-00 | 155-0078-xx • 155-0273-00 • 155-0274-00 | Monolithic integrated circuit | broadband amplifier | 464 • 465 • 466 • 468 • 475 • 475A • 475M • 485 • 7834 • 7844 • 7854 • 7904 • R7903 • R7912 • 7912AD • 7912HB • 7104 • 7A16A • 7A16P • 7A24 • 7A26 • 7A42 • 067-0587-01 • 067-0680-00 • AM503 • PG502 • PG508 • DC510 • DC5010 • FG5010 |
155-0167-01 | 155-0167-01 | Hybrid integrated circuit | 4-bit D/A converter | 7854 • ADC820T |
155-0187-00 | 155-0187-00 | Monolithic integrated circuit | ft doubler amplifier | 7854 |
155-0206-00 | 155-0206-00 | Hybrid integrated circuit | channel switch | 7854 |
MC3448 | 156-1133-02 | Monolithic integrated circuit | GPIB bus driver | 7854 |
MC68488 | 156-1246-00 | Monolithic integrated circuit | GPIB controller | 7250 • 7854 • CG551AP • CG5001 • CG5010 • CG5011 • Keithley 181 • Keithley 192 |
Mostek MK36000 | Monolithic integrated circuit | 8K×8 mask-programmable ROM | 468 • 7854 • FG5010 | |
Signetics 82S107 | Monolithic integrated circuit | field-programmable logic array | 4052 • 7854 • FG5010 | |
Texas Instruments TMS9900 | 156-0935-00 | Monolithic integrated circuit | 16-bit microprocessor | 1980 • 7854 |