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Tektronix DC508
1 GHz counter
Tektronix DC508

Produced from 1978 to 1980

(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.


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


  • 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.


Documents Referencing DC508

Document Class Title Authors Year Links
Tekscope 1978 V10 N3.pdf Article New Products 1978

Documents Referencing DC508A

Document Class Title Authors Year Links
Tekscope 1980 V12 N4.pdf Article New Products 1980



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