From TekWiki
Jump to navigation Jump to search
Tektronix 2641
100 kHz Fourier Analyzer
Tektronix 2641

Produced from 1991 to 1993

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

The Tektronix 2641 is a Fourier analyzer that links dedicated signal acquisition and analysis with a personal computer’s mass storage and graphics. It allows measurement solutions for electrical, mechanical, and electromechanical applications in the DC to 100 kHz frequency range. Typical applications are Structural Analysis, Control Systems, Machine Vibration, Audio and Acoustic Tests, and General Purpose Signal and System Analysis.

Each of the channel inputs provide simultaneous sampling of all channels utilizing 12 bit ADC standard or 16 bit ADC optionally. Signal processing includes Fourier Transform (FFT) and Spectral Lines. The signal generator has a wide variety of functions, like sine, square, sawtooth, triangle, input, random, adjustable random, chirp, and arbitrary. With the optional TurboPac Application Library and Run-Time License advanced measurement calculations and graphs can be generated from the data collected.

The PC’s monitor displays the measurements results – but that’s where the Fourier Analyzer dependence on the PC stops. All of the data acquisition, data management, signal processing and other computationally intensive operations are reserved for the Fourier Analyzer’s high-performance measurement and analysis hardware. Built-in analog and digital anti-alias filters automatically track all of the bandwidth settings. A selection of frame sizes allows the user to choose the best trade-off between acquisition time and frequency resolution. When high frequency resolution around a specific signal is needed, the option "zoom" feature can be used. It allows one to focus up to 1600 spectral line with a span as small as 10 Hz about the frequency of interest.

To learn more about FFT read Fast Fourier transform on at https://en.wikipedia.org/wiki/Fast_Fourier_transform.

Front panel inputs/outputs are: CH1, CH2, CH3, and CH4 each with a BNC connector (1 MΩ; 200 pF; ±30 V); and OUTPUT BNC connector (50Ω; ±10 V; signal general output capable of a variety of pre-defined, as well as user-defined, signals.)

Rear panel inputs/outputs are: SYSTEM INTERCONNECT DB9 connector (Male connector used for both External triggering, and External sampling inputs. All pins TTL-level except Signal ground: Pin 1 triggering signal input; pin 2 trigger sense output; pin 3 external clock input; pins 6 thru 8 signal ground; pin 9 is the external sampling input); and SERIAL PORT BNC connector (Female connector used linking to the host computer via a Tektronix supplied serial interface cable).

Specifications based on 1991 published documentation, unless otherwise specified.

Key Specifications

Frequency Ranges DC to 100 kHz
Max Real-time Bandwidth 10 kHz
Dynamic Range 75 dB
Standard Channels 2
Max Channels 4
Channel Match ±0.075 dB (DC to 50 kHz)
Transient Capture Samples 500 K
Spectral Lines 25 to 1600
Input Impedance 1 MΩ; 200 pF
Max Input Level ±30 V
Included Accessories User Guide; Instrument Program Software; System Simulator Box; Power Cord; and Serial Interface Cable (please specify)
Weight Standard accessories: 11.8 kg (26 lbs)
Power 90 − 250 VAC, 48 to 66 Hz, >120 W
Operating Atmospherics Temperatures: 0 °C to +50 °C; Humidity: 95% for five days; Altitude: Up to 4.8 km (15,000 ft)


  • Opt. 1H: Four Input Channels
  • Opt. 2H: 2-CH Zoom
  • Opt. 3H: 4-CH Zoom
  • Opt. 4H: Signal Generator