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.
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 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 DC508
| Document | Class | Title | Authors | Year | Links |
|---|---|---|---|---|---|
| Tekscope 1978 V10 N3.pdf | Article | New Products | 1978 | SC503 • DC508 • 634 | |
| 070-2088-04.pdf | Book | TM500 Series Rear Interface Data Book | 1985 | AA501 • AF501 • AM501 • AM502 • AM503 • AM511 • DC501 • DC502 • DC503 • DC503A • DC504 • DC505 • DC505A • DC508 • DC508A • DC509 • DC510 • DC5009 • DC5010 • DD501 • DL502 • DM501 • DM501A • DM502 • DM502A • DM505 • DM5010 • FG501 • FG501A • FG502 • FG503 • FG504 • FG507 • FG5010 • LA501 • LA501W • WR501 • MR501 • PG501 • PG502 • PG505 • PG506 • PG507 • PG508 • PS501 • PS502 • PS503 • PS503A • PS505 • PS5010 • RG501 • SC501 • SC502 • SC503 • SC504 • SG502 • SG503 • SG504 • SG505 • SW503 • TG501 • TR501 • TR502 • MI5010 • MX5010 • SI5010 |
Internals
The DC508 uses an off-the-shelf divide-by-4 counter ICs as the prescaler, a Motorola MC1697 (Tek part number 156-0923-00), which is rated to 1 GHz.
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 |
|---|---|---|---|---|
| 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 |