DC503A

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Tektronix DC503A
125 MHz, 8-digit frequency counter
Tektronix DC503A

Produced from 1981 to 1993

Manuals
(All manuals in PDF format unless noted otherwise)
Manuals – Specifications – Links – Pictures

The Tektronix DC503A is a 125 MHz, 8-digit frequency counter plug-in for the TM500 system.

It replaced the DC503 in 1981.

Key Specifications

Resolution 8 digits
Frequency Range DC (AC coupled: 10 Hz) to ≥125 MHz
Impedance 1 MΩ paralleled by approx. 27 pF
Sensitivity 20 mVRMS sine to 100 MHz, 35 mVRMS sine to 125 MHz
Max Input Voltage 1× Atten: 200 Vpeak, 400 Vp-p @ DC − 50 kHz; 200 Vpeak, ≤(20/f) Vp-p @ 50 kHz − 1.33 MHz; 200 Vpeak, ≤15 Vp-p @ 1.33 – 125 MHz
Max Input Voltage 5× Atten: 200 Vpeak, 400 Vp-p @ DC − 5 MHz; 200 Vpeak, ≤(2000/f) Vp-p @ 5 − 100 MHz; 200 Vpeak, ≤20 Vp-p @ 100 – 125 MHz

Options

  • Opt. 01 — OCXO

Links

Documents Referencing DC503A

Document Class Title Authors Year Links
070-2088-04.pdf Book TM500 Series Rear Interface Data Book 1985

Rear interface

27B − Decimal point
26B – Remote Start 26A − /Reset
25A − TS1 (digit select 1, MSD)
24B − Scan clock out
23B − Overflow
22B − Ch.B Level 22A − Ch.A Level
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
15B – 10 MHz Ref Out 15A – Clock GND
14A − External Clock In

Internals

The DC503A is implemeted in a mix of ECL, TTL, and MOS ICs. uses an LS7031 6-digit counter IC, and two 74S288 PROMs that encode decimal point position and annunciators.

Pictures

Components

Some Parts Used in the DC503A

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
74S288 Monolithic integrated circuit 32×8 PROM DC503A PM110