DC503

Manuals – Specifications – Links – Pictures

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 It was introduced in 1972 at the launch of the TM500 system, and superseded by the DC503A in 1981.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
Impedance	1 MΩ paralleled by approx. 20 pF
Sensitivity	300 mVp-p sinewave times attenuation to 100 MHz
Max Input Voltage	1× Atten: 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× Atten: 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

• Divide-by-5 circuit board gerbers 670-3300-00 (ZIP)

Rear interface

• 14A − 1 MHz clock out
• 16A − CH A input (GND return on 17A)
• 17B − CH B input (GND return on 16B)
• 19B − Data good
• 19A − BCD output serial-by-digit (1)
• 20A − BCD output serial-by-digit (4)
• 20B − BCD output serial-by-digit (8)
• 21B − BCD output serial-by-digit (2)
• 22B/23B − Overflow out/overflow display disable in
• 24B/25B − Internal scan clock out/external scan clock in
• 25A − Time slot zero (TS₀)
• 26A − Reset, in/out
• 27A − Internal scan clock disable

Pictures

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  DC503

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  DC503

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  DC503

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  DC503 and PG502 in a TM503

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  DC503

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  DC503

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  DC503

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  DC503