DC508
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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 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
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
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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 |