by mjlorton @ youtube.com:
A catch for some new folks – Performance (waveform updates per second) drops off if you have a large enough horizontal offset / delay – this happens on most scopes.
The Keysight / Agilent struggles to Auto trigger on less frequent pulses. This is due to their Auto trigger rearm timer being very short…because the scope is fast.
The Keysight has a set of 5 GSa/s ADC’s and MegaZoom IV ASIC’s paired and hardwired behind channels 1 & 2 , 3 & 4 respectively.
This means that if you are only using two channels and you select 1 & 2…the sample rate is halved to 2.5 GSa/s and so is the waveform update rate. You need to select channels 1 & 3 to maintain the higher performance and sampling rate.
The Tektronix MDO3000 series allow you to select any two channels and maintain the higher sampling rate.
The new time correlated FFT (frequency domain) feature (FFT Gating) with a time domain signal suffers from a harware problem. If too much data is being parsed in the zoomed mode with FFT Gating, the FFT funcion will stop / hang / freeze.
Keysight MSO-X 3000T – Tips, Quirks and a Bug! - [Link]
In this world exclusive episode, Shahriar visits Teledyne LeCroy to take a close look at the operation, teardown and experiments with the LabMaster 10-100zi, 100GHz simultaneous bandwidth, 240GS/s real-time oscilloscope. This instrument provides either a single 100GHz channel, or two 33GHz and one 65GHz digitizing channels. The instrument uses a frequency interleaving technique invented and implemented at LeCroy.
The block diagram and the theory of operation of the scope is presented. This includes the architecture of the 4x80GS/s ADCs and the triple frequency interleaving system. The teardown of the scope includes a close look at the ADC platform, the dual frequency interleaving (65GHz operation) and the triple frequency interleaving (100GHz operation). The experiments with the scope demonstrate the instrument’s capability to digitize signals up 100GHz using the beat frequency of two non-coherent lasers. The scope is also used to capture a 4pS rise time pulse from a femtosecond laser pulse system and a high-speed photo detector.
A complete factory tour is also presented where Teledyne LeCroy assembles all their oscilloscope products right here in the USA.
Experiments and Teardown of the Teledyne LeCroy LabMaster 10-100zi 100GHz, 240GS/s Oscilloscope - [Link]
Back to basics introduction to the differential amplifier, aka the diff-pair, long-tailed pair, emitter coupled pair, etc. The basic operation of the circuit is presented, along with a simple mechanical simulation. Also, how the addition of current sources and mirrors can be used to address some of the performance issues, and begin to form the rudimentary beginnings of an op amp. This is the follow-up video from “teaser” video published earlier.
Back to Basics: the differential amplifier, aka long-tailed pair, diff-pair - [Link]
In this episode Shahriar does an extensive review and teardown of the Keysight (Agilent) MSO-S Series 10-bit 20GS/s Oscilloscope. This scope supports bandwidths up to 8GHz and 400M points of memory per channel. With hardware 10-bit ADCs as well as an ultra low-noise front-end, this scope offers an impressive dynamic range on all four channels. All scope features are software upgradable.
The teardown consists of a close look at the acquisition board and the system blocks diagram. Various elements such as the ADC structure, FPGAs, memory and the time-base are all examines. The scope offers a +/-12ppb time-base with a 100fs jitter noise floor. Some basic performance measurements are also presented such as noise and SFDR.
The wireless experiment shows the performance of the scope in demodulating very low-power signals on an RF carrier. A -75dBm 2.5GHs QPSK signal can be demodulated by the scope. The instrument can also demodulate a 16QAM signal in presence of an interfering signal which is 44dB higher in signal power. All demodulation experiments are performed using the Keysight VSA.
The backplane experiments demonstrate the scope’s capability to perform jitter and noise analysis on multi-gigabit serial links. The built-in equalization software suites are used to find the FFE coefficients and those coefficients are used to perform hardware equalization in an FPGA communication link.
Review, Teardown and Experiments with a Keysight MSO-S Series 10-bit 20GS/s Oscilloscope - [Link]
by mjlorton @ youtube.com
In this video I explain how a spectrum analyser (Tektronix MDO3000) can be used to view signals in the frequency domain vs an oscilloscope’s time domain.
I give an overview of the logarithmic scale and its benefits vs a linear scale.
I explain how compound wave forms like square and triangle are made up of harmonics.
I do a practical demonstration of how the spectrum analyser works with some example signals. I then show how this can also be done on an oscilloscope using the FFT (fast Fourier transform) maths function.
Spectrum Analyzer, Scope and FFT looking at Signals - [Link]
Dave reviews the new Rigol DS1054Z Oscilloscope. Is this US$399 marvel really the best value budget oscilloscope on the market?
EEVblog #703 – Rigol DS1054Z Oscilloscope Review Summary - [Link]
The new Keysight/Agilent 3000T Oscilloscope is released today, and Dave has a world first review of it.
It’s a replacement for the existing 3000A X-Series, and is essentially the same in many ways, so only the differences are
covered in this video.
A lot of features from the 4000 X-Series have filtered down, and some things are now standard.
How does it compare to the Tektronix MDO3000?
EEVblog #701 – Keysight 3000T Oscilloscope Review - [Link]
A simplified explanation of how a capacitive MEMS accelerometer works.
How an accelerometer works! - [Link]
by EEVblog @ youtube.com:
Want to include a small Lithium Ion or Lithium Ion Polymer battery into your next project? It’s easy! Dave gives you the low down on how they work and how to charge them and select a suitable charging IC.
NOTE: For safety you should always use circuit protected cells as per the larger cell I was holding up. It protects against over-discharge, over-voltage, shorts etc.
(BTW, the reference to Lithium Ion Polymer being the same as Lithium Ion is in terms of charging, if that was not clear. The Ion Polymer type have polymer anode material and hence a different construction that allows the small pouch type cells shown in the video, and other thin odd shapes shown toward the end)
EEVblog #176 – Lithium Ion/Polymer Battery Charging Tutorial - [Link]