DC508A

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Tektronix DC508A
1.3 GHz counter
Tektronix DC508A

Produced from 1980 to 1983

Manuals
(All manuals in PDF format unless noted otherwise)
Manuals – Specifications – Links – Pictures

The Tektronix DC508A is a 1.3 GHz counter plug-in for the TM500 system.

It replaced the previous DC508 version (1978), extending the frequency range to 1.3 GHz.

Key Specifications

Frequency Range 0–100 MHz direct (15 mVRMS, 1 MΩ // 25 pF), gate times 1 ms to 10 s in decade steps; 100 MHz – 1.3  GHz via prescaler (20 mVRMS, 50 Ω input, fused), gate times 8 ms to 8 s in decade steps
Resolution 9 digits
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 DC508A

Document Class Title Authors Year Links
Tekscope 1980 V12 N4.pdf Article New Products 1980
070-2088-04.pdf Book TM500 Series Rear Interface Data Book 1985

Internals

The DC508A uses an off-the-shelf divide-by-4 counter ICs as the prescaler, a Plessey SP8611B (Tek part number 156-1302-01), which is rated to 1.5 GHz.

Pictures

Better pictures needed - please contribute

Components

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