The Tektronix TDS644A 4 Channel Digitizing Oscilloscope has a real-time bandwidth of 500 MHz and a sample rate of 2 GS/s, with a record length of up to 2,000 points per channel.
The Tektronix TDS644B has a sample rate of 2.5 GS/s, with a record length of up to 15,000 points per channel.

Tektronix TDS644
500 MHz, 2 GS/s, 4-Ch digital scope
Tektronix TDS644A

Produced from 1994 to (?)

Manuals

TDS644A

TDS644B

Schematics

Common

(All manuals in PDF format unless noted otherwise)

Features include Waveform Math and Advanced Waveform DSP, Color VGA Display, 3.5" DOS Format Floppy Drive, RS-232 interface, Centronics, GPIB and VGA Connector. Inputs have Tekprobe BNC connectors.

Opt.05 adds video trigger for NTSC, PAL, HDTV.

Key Specifications

Bandwidth 500 MHz
Sampling rate 2 GS/s (TDS644A), 2.5 GS/s (TDS644B) on all 4 channels
Time base 500 ps/Div to 5 s/Div
Deflection 1 mV/Div to 10 V/Div
Resolution 8 bits
Record length 500 to 2000 points (TDS644A), 15,000 points (TDS644B)
Input impedance 1 MΩ // 10 pF, or 50 Ω
Interface GPIB standard
Options
  • Centronics interface (standard)
  • RS-232 interface (standard)
  • FFT, integration and differentiation (standard)

Software


Firmware


Options

  • 05 - Video Trigger - Oscilloscope comes with tools that allow investigation of a range of NTSC, PAL, SECAM, and high definition TV signals.
  • 1M - 4M acquisition length - Extends standard acquisition length from 50,000 points per channel to 130,000 samples on three or four channels, 250,000 samples on two channels, and 500,000 samples on one channel.
  • 13 - RS-232C and Centronics hardcopy interfaces - Add RS-232-C and Centronics interface ports.
  • 1F - Floppy disk drive - Add 3.5 inch, 1.44 MByte floppy disc drive.
  • 2F - Advanced DSP math - Add advanced DSP math features such as FFT, integration, and differentiation.

Optional Accessories

  • 1K - Add K420 scope cart
  • 1R - Rackmount kit
  • 2D - Delete standard 2 P6205 probes
  • 24 - Add 4 each P6139A passive probes
  • 25 - (TDS644A) Add 4 each P6563AS 20X SMD probes
  • 2P - Tektronix Phaser 200e Thermal Wax Transfer Color Printer
  • 4D - Delete standard 4 P6205 probes
  • 95 - TDS644A Calibration data report
  • 96 - TDS644A Calibration Certificate
  • D1 - TDS644B Calibration Data Report

TDS644A Included Accessories

  • 4x P6205 FET Probes
  • 070-8711-02 - Reference Manual
  • 070-8711-01 - User Manual
  • 200-3696-01 - Front cover
  • 161-0230-01 - US power cord

TDS644B Included Accessories

  • 4x P6243 FET Probes
  • 070-9382-00 - Quick Reference Guide
  • 063-2773-00 - Programmers Manual in MS-Help format on floppy disk
  • 070-6869-00 - User Manual
  • 070-9874-02 - Technical Reference Manual
  • 200-3696-01 - Front cover
  • 161-0230-01 - US power cord
  • 016-1268-00 - Accessory Pouch

Recommended Accessories

  • 012-0991-01 - 1m GPIB cable
  • 012-0991-00 - 2m GPIB cable
  • 012-1298-00 - RS-232 cable
  • 012-1250-00 - Centronics cable
  • 016-0909-01 - Soft-sided carrying case
  • 016-01135-00 - Transit case
  • K420 - Scope cart

Links

Pictures

Components

Some Parts Used in the TDS644A


Some Parts Used in the TDS644B

Part Part Number(s) Class Description Used in
H2462 Hybrid integrated circuit oscilloscope channel input module TDS510B TDS520B TDS524B TDS540B TDS544B TDS620B TDS640B TDS644B TDS680B TDS684B TDS714 TDS724 TDS744 TDS754 TDS782 TDS784 TDS794