DC504
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The Tektronix DC504 is a 80 MHz, 5-digit frequency counter plug-in for the TM500 system.
It was superseded by the DC504A in 1984.
Key Specifications
| Frequency Range | DC (AC coupled: 10 Hz) to at least 80 MHz |
|---|---|
| Sensitivity | 20 mVRMS sine wave below 15 MHz, 35 mVRMS to 50 MHz, derated down to 175 mVRMS at 80 MHz |
| Input impedance | 1 MΩ // 20 pF |
| Trigger Level Range | −1.5 V to +1.5 V |
| Frequency Resolution | kHz ranges: 0.1 Hz; 1 Hz and 10 Hz (7 digit resolution possible in overflow kHz position); MHz ranges: 100 Hz, 1 kHz (9 digit resolution possible in overflow kHz position) |
| Period resolution | ms ranges: 1 µs, 10 µs; s ranges: 10 ms, 1 ms, 0.1 ms |
| Display Time | Variable ~0.1 s ... ~10 s and HOLD mode |
| Standard Time Base | 1 MHz, ±1×10-5 from 0°C to +50°C, ±1×10-5 per month, Adjustable to within 1×10-7 |
| Opt. 1 Time Base | 5 MHz, ±1×10-7 from 0°C to +50°C, ±1×10-7 per month, Adjustable to within 1×10-9 |
An internal "RPM" mode switch stretches gate times sixfold, giving a longest gate time of 1 minute with a display scaled in revolutions per minute.
Links
Documents Referencing DC504
Patents that may apply to DC504
| Page | Title | Inventors | Filing date | Grant date | Links |
|---|---|---|---|---|---|
| Patent US 3562464A | Cam actuated switch having movable and fixed contacts on circuit board | Howard Vollum • Willem H Verhoef • Tony Sprando | 1968-10-07 | 1971-02-09 | Cam switches • 2101 • 2701 • 2703 • 432 • 434 • 465 • 475 • 5A15N • 5A18N • 5A20N • 5A21N • 5A38 • 5A45 • 5B10N • 5B12N • 7A15 • 7A16A • 7A18 • 7A19 • 7A24 • 7A26 • 7B10 • 7B15 • 7B50 • 7B51 • 7B52 • 7B53A • 7B50A • 7B70 • 7B71 • 7B80 • 7B85 • 7B87 • 7B92 • 7B92A • 7D01 • 7D12 • 7D15 • 7J20 • 7S12 • 7T11 • 7T11A • AF501 • AM502 • AM503 • DC502 • DC503 • DC504 • DC505 • DM501 • DM502 • FG501 • FG501A • FG502 • FG503 • FG504 • FG507 • PG501 • PG502 • PG505 • PG506 • PG506A • PG508 • TG501 • SC502 • SC503 • SC504 |
Rear Interface
| 28B − Gate Out, Totalize Start/Stop | 28A − Hold |
| 27B − Decimal point | |
| 26A − /Reset | |
| 25A − TS1 (digit select 1, MSD) | |
| 24B − Scan clock out | 24A − TS2 (digit select 2) |
| 23B − Overflow | 23A − TS3 (digit select 3) |
| 22A − TS4 (digit select 4) | |
| 21B − BCD out 2 | 21A − TS5 (digit select 5, LSD) |
| 20B − BCD out 8 | 20A − BCD out 4 |
| 19B − Latch Out (Data Good) | 19A − BCD out 1 |
| 17A – Signal Input GND | |
| 16A − Signal input | |
| 15A – External Clock GND | |
| 14A − External Clock (GND on 15A) |
Internals
The DC504 uses a Mostek MK5009P PMOS oscillator/counter IC to control gate times. The first counter stage is a Signetics 82S90 85(100) MHz decade counter, followed by four 7490 decade counters, 7475 latches, and 7401s to multiplex the output/display.
Pictures
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DC504
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DC504
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DC504
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DC504
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DC504
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DC504
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DC504 inside; component side
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DC504 inside; copper side
Components
Some Parts Used in the DC504
| 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 |
| Mostek MK5009 | 156-0410-00 | Monolithic integrated circuit | oscillator/counter | DC504 |
| Signetics 82S90 | 156-0482-01 | Monolithic integrated circuit | 85(100) MHz decade counter | DC504 |