2642

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The Tektronix 2642A 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 200 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.

Fast Fourier transform (FFT) is an algorithm that computes the descrete Fourier transform (DFT) of a sequence, or its inverse (IDFT). Fourier analysis converts a signal from its original domain (often time or space) to a representation in the frequency domain and vice versa..

Fourier analysis

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).

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Specifications based on 2000 published documentation, unless otherwise specified.

Key Specifications

Frequency Ranges	DC to 200 kHz
Max Real-time Bandwidth	100 kHz
Dynamic Range	75 dB, extended to 90 dB with Opt. 16 or 17
Standard Channels	2
Max Channels	4
Channel Match	±0.075 dB (DC to 50 kHz)
Transient Capture Samples	500 K, extended to 3.5 M with Opt. 6M (6 MB)
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: 12.3 kg (27 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)

Options

• Opt. 1H: Four Input Channels
• Opt. 16: Two 16-Bit Input Channels
• Opt. 17: Four 16-Bit Input Channels
• Opt. 6M: Large Data Memory (add 6 MB)

Pictures

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