DC508

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Tektronix DC508
1 GHz counter Tektronix DC508 Produced from 1978 to 1980 Manuals DC508 Manual (OCR) DC508A Manual (OCR) (All manuals in PDF format unless noted otherwise)

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

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

Prescaler board
DC508A in TM515 with other TM500 gear
DC508 prescaler board schematic

Components

Some Parts Used in the DC508

Part	Part Number(s)	Class	Description	Used in
2N4249	151-0342-00	Discrete component	PNP Si low noise amp.	DC501 • DC502 • DC503 • DC503A • DC504 • DC504A • DC505 • DC505A • DC508 • DC508A • DC509 • DC510
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
2N4249	151-0342-00	Discrete component	PNP Si low noise amp.	DC501 • DC502 • DC503 • DC503A • DC504 • DC504A • DC505 • DC505A • DC508 • DC508A • DC509 • DC510
Plessey SP8611B	156-1302-01	Monolithic integrated circuit	1.3 GHz divide-by-4 prescaler	DC508A