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David Herres

Review: Working with the Tektronix MDO3104

June 10, 2022 By David Herres Leave a Comment

MDO3104

The model number on the Tektronix MDO3104 oscilloscope denotes that it is a 3000-Series Mixed-Domain Oscilloscope. The mixed domain moniker means it is capable of displaying a waveform simultaneously in the time domain and in the frequency domain. The time domain is more familiar, the way we envision a sine wave when amplitude is plotted […]

Filed Under: Digital Oscilloscope, FAQ, Featured, New Articles, Oscilloscope Descriptions, Oscilloscopes Tagged With: FAQ, Tektronix

Is there such a thing as a catenary antenna?

June 3, 2022 By David Herres Leave a Comment

parabolic antennas

A conic section is formed by the intersection of a plane that cuts though a cone, usually with the circle at the top and the hyperbola at the bottom. Between them lie the ellipse and the parabola. The parabola has distinctive properties when rotated in space to make a concave surface. The parabola can be […]

Filed Under: FAQ, Featured, New Articles, Test and Measurement News, wireless Tagged With: FAQ

The ups and downs of bad DACs

May 27, 2022 By David Herres Leave a Comment

DACs

A digital-to-analog converter (DAC) is more prone than an analog/digital converter to signal degradation. DACs are complex devices requiring precisely matched components. For this reason, with notable exceptions, DACs are implemented as mixed-signal ICs based on MOSFET technology. Discrete component DACs are found in radar systems and high-speed test equipment including digital sampling oscilloscopes. Digital […]

Filed Under: FAQ, Featured, oscilloscope measurements Tagged With: analogdevices, FAQ, texasinstruments

The up side of under sampling

May 20, 2022 By David Herres Leave a Comment

A digital signal can be derived from the original time-varying, continuous analog signal by creating a sampled sequence of quantized values. It is intuitively evident that the fidelity and resolution of this quantized signal is based upon the number of samples taken per unit of time. Harry Nyquist published an early version, later further formalized […]

Filed Under: FAQ, Featured, New Articles, Test and Measurement News Tagged With: FAQ, texasinstruments

Measuring and using static electricity

May 12, 2022 By David Herres Leave a Comment

static electricity

Many moons ago, a future member of our editorial staff was playing with his very first multimeter. He was a farm kid. One of his first experiments was to put the negative lead of the meter on a ground rod and the positive lead on one of the metal bands used to reinforce the interlocking […]

Filed Under: FAQ, Featured, Meters & Testers, Test and Measurement News Tagged With: FAQ

Coaxial cable myths and misunderstandings

May 6, 2022 By David Herres Leave a Comment

coax myths

In this age of misinformation, you can add coaxial cable to the list of items for which it is easy to get steered wrong based on internet searches. Much of the bogus online commentary about coax relates to cable loss, cable impedance, and standing waves. Here are a few basics that may help sort the […]

Filed Under: FAQ, Featured, New Articles, Test and Measurement News Tagged With: FAQ

Can something consume energy without emitting a field?

April 29, 2022 By David Herres Leave a Comment

em fields

The editorial offices of Testandmeasurementtips.com recently received a letter from an individual who headed up a group of investigators of paranormal phenomenon. It was a serious letter. To summarize, the group had concluded there was no legitimate method to record the activity of an alleged haunting. But the writer did have a question for us, […]

Filed Under: FAQ, Featured, New Articles, Test Equipment Tagged With: FAQ

How big is the band gap? A heated discussion

April 22, 2022 By David Herres Leave a Comment

There’s a trick with a soldering iron that can be used to determine whether an unidentified semiconductor is n-type or p-type. In essence, it determines whether the majority carriers are holes (p-type) or electrons (n-type). Just as heat makes a gas expand (PV=nRT), the hot tip of a soldering iron makes carriers expand away from […]

Filed Under: FAQ, Featured, New Articles, Test Equipment Tagged With: FAQ

The difference between signal under-sampling, aliasing, and folding

April 15, 2022 By David Herres Leave a Comment

aliasing and folding

Most engineers today are sensitive to problems that arise when digital measurement instruments try to capture signals containing frequencies that are too high for the sampling circuitry to handle. Nevertheless, there are terms associated with sampling problems that sometimes get confused. Probably the three concepts most likely to cause issues are under-sampling, aliasing, and folding. […]

Filed Under: data acquisition, FAQ, Featured, New Articles, Oscilloscopes Tagged With: FAQ, Tektronix

Difference between a waveguide and transmission line

April 11, 2022 By David Herres Leave a Comment

featured

As electronics migrates to higher and higher frequencies, the media routing electronic signals to their intended destinations grow increasingly exotic. This is particularly true as communication technology moves to 5G frequencies which are characterized by millimeter wave transmissions. In this frequency range, engineers are more likely to encounter waveguides and transmission lines rather than ordinary […]

Filed Under: FAQ, Featured, New Articles Tagged With: FAQ

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