308

Tektronix 308

The Sony/Tektronix 308 is a portable 8-channel, 20 MHz "data analyzer" (logic analyzer) with parallel timing, parallel state, serial (up to 9600 bps) and signature analysis modes.

The 308 uses two probes, the standard P6451 8-channel + clock data acquisition probe, and the optional 16-channel P6406 word recognizer probe. Both use 012-0747-00 cable harnesses to attach to the data source.

Manuals

• Tektronix 308 Operator's Manual (PDF)
• Service manual / schematics needed

Key Specifications

	— Inputs —
Data	Eight data channels + 1 clock channel (P6451 probe), impedance 1 MΩ // 5 pF, max. ±40 V nondestructive, logic threshold fixed 1.4 V (TTL) or variable from -12 V to +12 V
Word recognizer	Sixteen TTL inputs (+40/-400 μA max.), max. +15/-1 V
Serial	BNC connector, 1 MΩ // 40 pF, max. ±250 V on BNC; used with P6107 probe, 10 MΩ // 13 pF, max. ±500 V
Qualifier	BNC connector, 10 kΩ, max. +10/-5 V
	— Acquisition —
Clock	50 ns to 200 ms per sample (1-2-5 sequence) or external down to 50 ns
Timing	Data setup time min. 25 ns, hold time min. 0 ns
Memory	2 × 252 eight-bit words (acquisition + reference)
Trigger mode	PRE (trigger at memory location 240) or POST (location 13)
Trigger delay	0-65535 clock periods
Serial data	5, 6, 7 or 8 bits per character, asynchronous (50, 75, 110, 134.5, 150, 200, 300, 600, 1200, 1900, 2400, 4800 or 9600 bits/s or external up to 9600 bits/s) or synchronous up to 9600 bits/s
	— Display —
CRT	6.8 cm × 5.4 cm, P4 phosphor (white)
	— General —
Power	90-132 V or 180-250 V, 48-440 Hz
Weight	3.7 kg (8.16 lb)

Links

• Tekscope Vol. 12 No. 2, Apr 1980, Ed Averill, John Huber: Portable Data Analyzer Speeds Test and Service of Microprocessor-Based Systems
• Tek 308 @ radiomuseum.org
• Tek 308 @ barrytech.com

Internals

The 308 is built around an Intel 8085A microprocessor. The display is a magnetically deflected raster-scan CRT. The only Tek-specific IC in the 308 is a 155-0067-02 SMPS controller.

Pictures

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  308 display, timing mode (binary counter example)

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  308 display, state mode (binary counter example)

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  P6451 probe

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  P6451 probe

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  P6451 probe internal, PCB front

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  P6451 probe internal, PCB back

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