DC503
The Tektronix DC503 is a 100 MHz, 7-digit frequency counter plug-in for the TM500 system. . It was introduced in 1972 at the launch of the TM500 system, and superseded by the DC503A in 1981.
Opt.01 is an OCXO for improved stability.
Key Specifications
Frequency Range | 0.1 Hz (AC coupled: 10 Hz) to 100 MHz |
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Impedance | 1 MΩ paralleled by approx. 20 pF |
Sensitivity | 300 mVp-p sinewave times attenuation to 100 MHz |
Max Input Voltage, 1× Att. | 50 V @ ≤2 kHz, derate –20 dB/decade to 10 MHz; 10 V @ 10 kHz to 25 MHz, derate –20 dB/decade to 50 MHz; 5 V @ 50 MHz to 100 MHz |
Max Input Voltage, 10×/100× Att. | 500 V @ ≤2 MHz, derate –20 dB/decade to 100 MHz |
— Standard time base — | |
Frequency | 1 MHz ± 1 × 10-7 at cal |
Error | ≤ ±1 × 10-5 from 0 °C to +50 °C |
Aging | ≤ ±1 × 10-5 per month |
— Opt.01 OCXO time base — | |
Frequency | 5 MHz ± 5 × 10-9 at cal |
Error | ≤ ±5 × 10-7 from 0 °C to +50 °C (after oven warm-up) |
Aging | ≤ ±1 × 10-7 per month |
Gerbers
Rear interface
27A – Internal scan clock disable | |
26A − Reset, in/out | |
25B − Ext scan clock in | 25A − Time slot zero (TS0) |
24B − Scan clock out | |
23B − Overflow disp.dis. in | |
22B − Overflow out | |
21B − BCD out 2 | 21A − TTL Clock Input |
20B − BCD out 8 | 20A − BCD out 4 |
19B − Latch Out (Data Good) | 19A − BCD out 1 |
17B – Ch B Input | 17A – Ch A Input GND |
16B – Ch B Input GND | 16A − Ch A Input |
14A − 1 MHz clock out |
Links
Documents Referencing DC503
Pictures
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DC503 front (older version) in operation
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DC503 front (older version)
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DC503 front (newer version)
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DC503 in operation
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DC503 rear
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DC503 top
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Components
Some Parts Used in the DC503
Part | Part Number(s) | Class | Description | Used in |
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2N4249 | 151-0342-00 | Discrete component | PNP Si low noise amp. | DC501 • DC502 • DC503 • DC503A • DC504 • DC504A • DC505 • DC505A • DC508 • DC508A • DC509 • DC510 |