Application Notes
Getting Started
Downloading and Executing Packaged Programs and Tcl/Tk Source Code
This paper describes how to download and run both compiled executables and source code for the Open Instrumentation Project and Syscomp USB Instruments. Instructions for compiling or “wrapping’ the source code are also included.
Applications & Educational Papers
Measuring Crystal and Narrow-band Repsonses
This article demonstrates how to use the CircuitGear to measure the amplitude and phase response of a crystal or narrow-band filter. The vector network analysis functionality of the CircuitGear is used to plot the response over a narrow range of frequencies for both two terminal devices, such as crystals, and four terminal devices such as a transformer with a tuned secondary.
Measuring Impedance and Frequency Response of Guitar Pickups
The CircuitGear oscilloscope/signal-generator has a number of capabilities that make it useful for measuring impedance and frequency response. In this note we show how those features are used to measure the impedance and frequency response of guitar pickups.
CircuitGear Measurements on a Tube Radio
New technology and old technology come together, when the Syscomp CGR-101 CircuitGear is used to check out the health and operation of a classic 5-tube AM rable radio from the 1950’s. This paper shows how to work safely on tube-type equipment, including isolating from the AC line and dealing with high voltages. The paper shows how the modern techniques of spectrum analysis and vector network analysis yield useful insights into radio operation.
A GPS Data Display
There are many applications where one wishes to acquire geographic position data from a GPS receiver. In this particular instance, Peter needed to acquire a series of street light level readings and tag each one with its location. This paper describes a stand-alone program written in Tcl/Tk which communicates to a GPS receiver through a USB-serial port and displays the GPS data.
Measuring Camera Shutter Speed
The digital camera is a useful instrument for the measurement of light pollution. It can be used to simultaneously create a photographic record of a scene and perform the function of a light meter. If the camera is properly calibrated, the numerical value of a pixel in the image can be related to luminance (brightness) in the image. Then a digital camera becomes a low-costmeasuring instrument, replacing specialized instruments of much higher cost.
A Laplace Transform Cookbook
The Laplace transform is a very useful tool in electronic circuit analysis. With an emphasis on practical applications, the Laplace Cookbook shows how to use the Laplace transform to determine the sine-wave frequency response and transient pulse response of an electrical network. The paper includes measurement results that confirm the mathematics, using the Syscomp WGM-101 waveform generator, DSO-101 oscilloscope and Bode Plot software.
Project-Based Learning: Outcomes, Descriptors and Design
This paper contains three sections on project-based learning. First, we provide a rationale and a high-level view of projects and their organization. Second, we present some examples from Ryerson University and show how these project descriptors apply. Finally, we describe the Open Instrumentation Project, a new system of electronic instrumentation that support independent and project-based learning.
Pulse Oximeter Project Exercise
This paper outlines a senior level Electrical Engineering project where the student can measure blood oxygen level and heart rate using some simple circuitry and Syscomp USB lab instruments. In this paper, we identify key design decisions and intermediate steps towards a final design.
Design & Measurement Techniques
Low-Cost Curve Tracer Uses PC-Based Scope
Curve tracers are available from various manufacturers as an integrated instrument which includes power supplies, switches, and an XY display. This paper describes how to create a curve tracer using the XY plotting facility of Syscomp USB instruments and some simple external circuitry.
High Speed Time Domain Measurements: Practical Tips for Improvement
John Ardizzoni
Analog Dialog, Vol. 41, March 2007, pp. 1-6
This paper is a very thorough explanation of oscilloscope probe theory and operation, including calibration techniques. It also demonstrates how to use scope probes in high speed measurements.
High Speed Amplifier Techniques
Jim Williams
Linear Technology Application Note 47, August 1991, pp. 1-132
This paper is a must-read for anyone interested in high-speed analog circuit design. It is divided into two sections. The first section gives an overview of the practical aspects of high-speed circuit design. The second section is a tutorial on measurement technique – using oscilloscope probes – in high-speed circuitry.
Installation/Troubleshooting
Installing the DSO-101 Oscilloscope in Ubuntu Linux
The application note describes how to install the DSO-101 oscilloscope software on a Ubuntu Linux system. This procedure was tested on an Edubuntu system, Hardy Heron, April 2008. Similar instructions apply to installation of other Syscomp USB instruments.
Test Equipment and Instrumentation
Avoiding Battery Brownout
These days, many amateur astronomers use a GOTO telescope mount – a mount that uses GPS to determine the location, and a computer to aim the telescope. The telescope mount is usually powered by a lead-acid battery. This application note was originally written for these astronomers, but it will be of interest to anyone using a lead-acid battery
The application note shows methods of charging and discharging the battery that prolongs its life. We also show how to measure battery capacity using the Syscomp DVM-101 recording multimeter. And we include design and construction information for an expanded scale voltmeter that can be used as a a ‘gas gauge’ for a lead acid battery.
How to Buy and Oscilloscope
For anyone doing electronics – as a job, studies, or a hobby – the oscilloscope in an indispensable tool. You’ll spend a lot of time with your scope, so it’s important to get something that does what you need. In this paper, we discuss oscilloscope features and specifications, things that are useful to know before buying and oscilloscope.
Customer Applications & Circuits
Putting the Mac In-Touch with the Physical World
In an article published in AUSOM, Miles dicusses his experience with the DSO-101 running on a Mac.
Copyright AUSOM Inc.
Article originally published in AUSOM News, April 2010. Reproduced with permission. For further details about AUSOM Inc. visit www.ausom.net.au
Current and Power Waveform Measurement Technique
Ron Pugh (8 pages, updated 3/09)
Oscilloscope inputs generally accept voltage signals with respect to a common ground. In many power control applications, it’s useful to measure circuit current and/or differential voltage across some component. This application note shows the circuits and construction of a current sensor and a differential voltage amplifier for such applications.
Device Specific
DSO-101: Single-Shot Capture Using the Oscilloscope: Measurements on a Relay
This paper highlights the usefulness of the single-shot trigger functions of the DSO-101 oscilloscope. Step-by-step instructions are included explaining how to set up the scope to capture the unique characteristics of relays switching.
A Software-Based Network Analyzer
The purpose of a network analyzer is to demonstrate the amplitude and phase response or transfer function of an electrical network. For example, a network analyzer is useful in measuring the amplitude response of an audio tone control. It is possible to make this type of measurement by hand, using the WGM-101 waveform generator and the DSO-101 oscilloscope. The software described in this paper does the job automatically, and plots the amplitude and phase response against frequency.
This paper describes the theory behind the network analyzer. A similar version of the paper appears in the September 2006 issue of Circuit Cellar Magazine.
Hands-On Exercises
Signal Generator Basics
In these exercises we introduce the use of the electronic signal generator. The signal generator is a kind of power supply that can produce a time-varying voltage. One can adjust the maximum amplitude of this voltage, the frequency and the shape of the waveform – that is, the way the voltage changes with time.
Scope Probes: Compensation and Loading
For much work with the oscilloscope, one can make a direct, wired connection into the BNC connectors – using an alligator-clip to BNC test lead, or a Binding-Post BNC adaptor. However, when you are observing high frequencies or your signal has abrupt transitions – like a square wave – then you should use the oscilloscope probe.
Capacitor: Time Domain
In this exercise we examine the electrical properties of the capacitor. The capacitor is a device for storage of electronic charge (electrons). A battery is used for long-term storage of electronic charge. A capacitor is usually used for short-term storage. Furthermore, storing charge in a battery is inherently much less efficient than storing charge in a capacitor. Most of the charge into a capacitor is available on discharge, even at a very high discharge rate.
Microphone and Oscilloscope
A microphone can be used with an oscilloscope to see the waveforms of various sounds. The oscilloscope may be used to view the shape of the waveform, the spectrum or the frequency response of a loudspeaker or microphone. The speaker and microphone can be used to explore acoustic resonance in an air column.
In this lab exercise, we show the connections for two types of microphones, and an amplifier for these microphones.
Spectrum Analyzer Basics
In a previous exercise, we studied the operation of the oscilloscope (scope). The scope shows a plot of waveform voltage vs time.
In this exercise we introduce the use of the electronic spectrum analyser. The spectrum analyser is a softwarebased feature of the oscilloscope that displays the characteristics of a signal in the frequency domain, that is, a plot of amplitude vs frequency.