Gwyddion is a modular program for SPM (scanning probe microscopy) data visualization and analysis. Primarily it is intended for analysis of height fields obtained by means of scanning probe microscopy techniques (AFM, MFM, STM, SNOM/NSOM), however it can be generally used for any other height field and image analysis It aims to provide multiplatform modular program for 2D data analysis that could be easily extended by modules and plug-ins. Moreover, the status of free software (Gwyddion is Free and Open Source software, covered by license GNU GPL) enables to provide source codes to developers and users, which makes the further program improvement easier. Gwyddion currently supports only a limited set of data file formats, but there are many data formats used in the field of Scanning Probe Microsopy.
 

           

Gxsm is a free software (under license GNU GPL) and is a complete interface for the acquisition and analysis of two dimensional (2D) or three dimensional (3D, multilayered 2D mode) data. It is a multi-channel image and vector-probe data acquisition and visualisation system primarily designed for surface analysis techniques as scanning probe microscopy, aka SPM (STM/AFM...) and spot profile analysis low energy electron diffraction (SPA-LEED), SARLS and even more (CCD) but not limited to them. The plug-in interface allows easy customization for extra math and specific hardware and instrument support; it can interface to a variety of commercial and open hardware for data acquisition (e.g. Signal Ranger card DSP/FPGA based with the tool/utility Srange). It can also be used in stand-alone mode for the visualisation and analysis of data. The GXSM core can handle different data types, e.g., integer and floating point numbers. An easily extendable plug-in architecture provides many image analysis and manipulation functions. A digital signal processor subsystem runs the feedback loop, generates the scanning signals, and acquires the data during SPM measurements. In addition it performs sophisticated spectroscopy tasks such as scanning tunneling spectroscopy. For more information about Gxsm click here.

             

The DSO-2150 USB is a portable oscilloscope with two channels and 150MS/s Real Sampling and a 60MHz (-3dB) Bandwidth designed for general signal testing with the characteristics of small size, low power consumption and high reliability. Powered by the USB interface, no need for external power supply, which offers high rate of transmission, high interference free performance and high unfailing performance without external power source, so it works well with a battery-powered laptop or notebook PC. You can print and save your data and reload saved data for further analysis. Some specifications are;

• Single shot bandwidth: 60MHz;
• Buffer size: 32K samples;
• 2 channels;
• Measurements: Vp-p, Vmax, Vmin, Vmeans, Vrms, Vamp, Vhigh, Vlow, positive overshoot, negative overshoot, cycle mean, cycle rms, period, frequency, positive pulse width, negative pulse width, rise time (10% ~ 90%) fall time (10% ~ 90%), positive duty cycle, negative duty cycle;
• Cursor: Time/frequency difference, voltage difference;
• Math: Addition, Subtraction, multiplication, Division;
• FFT: Rectangular, Hanning, Hamming, Blackman Window.

There are many models produced by Hantek and a number of them are used under GNU / Linux thanks to some open source software developed. Software applications for Hantek USB digital oscilloscopes are:

KJWaves is a frontend for SPICE3, NGSpice and GnuCAP simulators written to be a cross-platform tool in pure Java using NetBeans and runs on any platform where you can install a release of Java virtual machine. KJWaves can be used as a simple plotting program to display the content of a spice RAW file or as a complete frontend to the simulator. You can use KJWaves to load and edit a spice netlist, spawn a spice process and display the results, modify it and resimulate and it aids in viewing, modifying, and simulating circuit files (cir file) through an interactive GUI. It supports waveform math, copying to clipboard, and saving. Output graphs can be saved or printed. For more information about KJWaves, click here.