Tag Archives: Oscilloscope

Aeroscope – a wireless oscilloscope

aeroscope_600x450

A pair of former engineers from Agilent Technologies are working on a wireless oscilloscope that will connect to an iOS device for its user interface:

The Aeroscope will be a one-channel device where the electronics are in a “pen” form factor. An SMA connector will let you attach mini-grabbers or other probe tips. Analog bandwidth is 100 MHz with 500 Msamples/s sample rate. It should store 10 ksamples of waveform data.

Aeroscope – a wireless oscilloscope – [Link]

Oscilloscope tips and tricks

image: sparkfun.com
image: sparkfun.com

Arthur Pini has compiled a list of tips and tricks for use on digital oscilloscopes. The article is separated on 3 parts. The first is “10 Tricks that extend oscilloscope usefulness” the second is “10 More tricks to extend oscilloscope usefulness” and the third on the link below.

Modern digital oscilloscopes have a great many features that are not apparent to the casual user. By using these “hidden” features, you can save time and get the results you need to get the job done. This is the third installment of useful hints for extending the effectiveness of your digital oscilloscope.

Oscilloscope tips and tricks – [Link]

High-performance scope probes top out at 20 GHz

Tektronix, Inc., the world’s leading manufacturer of oscilloscopes, introduced the P7700 series of TriMode™ probes for use with Tektronix performance oscilloscopes. Offering up to 20 GHz bandwidth, the new probes ease the challenges designers face when debugging circuits found in the latest mobile and enterprise designs by minimizing probe loading, improving access to smaller, more-densely packed test locations and lowering overall cost of ownership.

The new P7700 series of probes from Tektronix takes a completely different approach, with the input amplifier integrated into the probe tip less than 4 mm from the connection point. This minimizes signal loss as well as probe capacitance and reduces noise susceptibility.

With prices starting at $8,500, the P7700 probes are intended for professional users.

High-performance scope probes top out at 20 GHz – [Link]

An almost-GHz active differential oscilloscope probe

 

assembled-probe

Christer wanted to see how a 500MHz differential clock was behaving so he decided to build an active probe. To simulate the circuit he used TINA spice software and documented the process in three parts on his website.

What I really wanted was an active differential probe which should be able to look at a 500MHz signal at a couple of volts or so with decent fidelity. To do that I wanted a probe with about one GHz of usable bandwidth. I have an old Tektronix 11801B scope with two 20 GHz sampling heads with 50Ω single ended inputs that can handle signals which are 1.0V peak-to-peak so that’s what I wanted the probe output to be compatible with. The probe must attenuate the signal so to not overdrive the inputs and to make things easy to calculate I decided on letting the probe have a 1:10 attenuation.

An almost-GHz active differential oscilloscope probe – [Link]

Eye Diagram Basics: Reading and applying eye diagrams

295166-tmw_eye_freescale_fig3

Deepak Behera, Sumit Varshney, Sunaina Srivastava, and Swapnil Tiwari discuss about using an oscilloscope to create eye diagrams and quickly evaluate system performance and gain.

Accelerating data rates, greater design complexity, standards requirements, and shorter cycle times put greater demand on design engineers to debug complex signal integrity issues as early as possible. Because today’s serial data links operate at gigahertz transmission frequencies, a host of variables can affect the integrity of signals, including transmission-line effects, impedance mismatches, signal routing, termination schemes, and grounding schemes.

Eye Diagram Basics: Reading and applying eye diagrams – [Link]

Easily measure diode capacitance and reverse recovery

1N4002 zero Vf bias ll 120pF

Glen Chenier @ edn.com wanted to find out the characteristics of an unknown diode to be able to replace it with an equivalent one so he decided to make some measurements using his test equipment. In this article he show us how to measure the junction capacitance, Cj, and reverse recovery time Trr of a diode using a function generator and a 100Mhz oscilloscope.

Easily measure diode capacitance and reverse recovery – [Link]

Choosing $1 sound card for DC-capable low speed oscilloscope

miniscope_v4

Tomasz Ostrowski has tested some cheap USB sound cards as low speed oscilloscope interfaces/recorders. He writes:

I’ve tested some cheap ($1) USB sound cards for DC sampling capability, in particular for using as low speed oscilloscope/signal recorder. Some (http://tomeko.net/dsoundscope/c_media.php or one from this thread: http://www.elektroda.pl/rtvforum/topic3106124.html) don’t seem to work despite removing DC blocking capacitor, but this one: http://tomeko.net/dsoundscope/C_Media2/ is fine. With just 120k resistor connected it is able to measure voltage from 0-6V range (cons: its input is at 2V level, sourcing 8uA if connected to GND and it’s single channel only). For test purposes I’ve prepared DLL interface for miniscope v4 (Win32 oscilloscope GUI) calibrated for this particular setup (example traces available).

Choosing $1 sound card for DC-capable low speed oscilloscope – [Link]

DIY Oscilloscope using Arduino and Graphic LCD

Prasad Pandit @ youtube.com:

I have designed an Oscilloscope using Arduino Mega 2560 and 128×64 GLCD. It works pretty good for verification of signal the range of input frequency is upto 10-12MHz and Sampling rate is 200KSPS. It has no Attenuation so you will have to convert highvoltage signal to 5 v pTp signal. And yes for Sine wave or Cos wave or signal which is below ground voltage you will have to DC shift the signal. You can set the Time/Division for studying signal. It gives Peak to Peak voltage value of signal in Real Time till two decimals.

All the Arduino GLCD libraries used are freely available. If you have suggestions mail me on: prasadp4009@gmail.com
Code Link : https://db.tt/itk4CLwi

DIY Oscilloscope using Arduino and Graphic LCD – [Link]

Compensation of Oscilloscope Probes

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by Maurizio @ dev.emcelettronica.com:

Using simple wires to measure signals with the oscilloscope would result in unreadable plots on the scope, the main reason being the noise coupled onto the “probe” itself. The first line of defense against that would be to use a coaxial cable as a probe, which would prevent external noise coupling.

An unwanted deterioration of the measured signal is due to the capacitive loading that such a piece of cable adds to the signal. An equivalent schematic of an IC to IC signal is illustrated in figure 1.

Compensation of Oscilloscope Probes – [Link]