DC508

Manuals – Specifications – Links – Pictures

The Tektronix DC508 is a 1 GHz counter plug-in for the TM500 system.

The DC508A version (1980) extended the frequency range to 1.3 GHz.

Both the DC508 and the DC508A use off-the-shelf divide-by-4 counter ICs as the prescaler. The DC508 uses a Motorola MC1697 (Tek part number 156-0923-00), which is rated to 1 GHz. The DC508A uses a Plessey SP8611B (Tek part number 156-1302-01), which is rated to 1.5 GHz.

Specifications

• 1 GHz, 9 digits
• 0-100 MHz direct (15 mV_RMS, 1 MΩ // 25 pF), gate times 1 ms to 10 s in decade steps
• 100 MHz+ via prescaler (20 mV_RMS, 50 Ω input, fused), gate times 8 ms to 8 s in decade steps
• Functions: Frequency, events

Options

• Option 1 − High accuracy time base
• Option 7 − Accepts rear panel control signals from a TR502 or SW503 to measure a marker frequency. Resolution and gating remote control circuitry is added to the DC508(A). Requires a TM503 - option 7 or an appropriately modified mainframe. This option inherently also adds option 1.

Links

• DC508 @ barrytech.com
• Tek DC508 page @ amplifier.cd

Documents Referencing DC508

Document	Class	Title	Authors	Year	Links
Tekscope 1978 V10 N3.pdf	Article	New Products		1978	SC503 • DC508 • 634

Documents Referencing DC508A

Document	Class	Title	Authors	Year	Links
Tekscope 1980 V12 N4.pdf	Article	New Products		1980	4634 • TR503 • FG507 • DC508A • 8550 • S-3275

Pictures

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  Prescaler board

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  DC508A in TM515 with other TM500 gear

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  DC508 prescaler board schematic

Components

Some Parts Used in the DC508

Part	Part Number(s)	Class	Description	Used in
Motorola MC1697	156-0923-00	Monolithic integrated circuit	1 GHz divide-by-4 prescaler	DC508

Some Parts Used in the DC508A

Part	Part Number(s)	Class	Description	Used in
155-0119-00	155-0119-00	Monolithic integrated circuit	5-digit BCD counter and multiplexer	DC508A
Plessey SP8611B	156-1302-01	Monolithic integrated circuit	1.3 GHz divide-by-4 prescaler	DC508A