DC509

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Tektronix DC509
135 MHz programmable frequency counter
Tektronix DC509

Compatible with TM500 system

Produced from 1981 to (?)

Manuals

Modifications

Manuals – Specifications – Links – Pictures

The Tektronix DC509 is a 135 MHz programmable frequency counter plug-in for the TM500 system. It is internally similar to the DC5009 to which it could be converted through an upgrade kit.

The DC509 uses reciprocal counting with an internal 100 MHz clock phase-locked to the reference oscillator. An R6504 microprocessor (28-pin variant of a 6502 with 8K addressable memory) performs the calculations.

Opt.01 is an OCXO for improved stability.

Specifications

Frequency ≤100 μHz to ≥135 MHz (Ch B in Ratio: ≥125 MHz)
Time A-B ≤15 ns to ≥3.05 hours
Single shot resolution 10 ns
Totalize 240</sup counts (1.09 × 1012)
     — Standard time base
Frequency 10 MHz ± 1 × 10-7 at cal
Error ≤ ±5 × 10-6 from 0 °C to +50 °C
Aging ≤ ±1 × 10-6 per year
     — Opt.01 OCXO time base
Frequency 10 MHz ± 2 × 10-8 at cal
Error ≤ ±2 × 10-7 from 0 °C to +50 °C (after oven warm-up)
Aging ≤ ±1 × 10-8 per day

Links

Rear interface

  • 14A − Ext Clock in (1, 5 or 10 MHz, ≥3 V into 1 kΩ)
  • 14B − Prescale; when low, counter divides readout by 16
  • 15B − 10 MHz clock out (GND return on 15A)
  • 16A − CH A input (50 Ω, ≤10 VRMS) (GND return on 17A)
  • 17B − CH B input (50 Ω, ≤10 VRMS) (GND return on 16B)
  • 22A − Trig Level CH A
  • 22B − Trig Level CH B
  • 23A − Shaped Out A (GND return on 23B)
  • 24B − Shaped Out B (GND return on 24A)
  • 26A − Reset in (active low)
  • 26B − Remote Start
  • 27A − Arming in (TTL, active high) (GND return in 28A)
  • 28B − Gate Out (TTL, active high)

Firmware (uploaded BIN files)

Photos