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22 Nov 2014

In this tutorial Dave describes what AC trigger coupling is on an oscilloscope and why it can be useful. Not only on old analog CRT oscilloscopes, but modern digital scopes as well.
How and why is it different to AC channel input coupling?
Also, use of the 50% trigger control, and how the venerable DS1052E is still more usable than the new DS1054Z.

EEVblog #685 – What Is Oscilloscope AC Trigger Coupling? - [Link]

15 Nov 2014

by EEVblog @ youtube.com

Dave investigates two very serious issues with jitter on the Rigol DS1000Z series oscilloscopes, including the DS1104Z and new DS1054Z
Some sort of modulated sampling/trigger jitter problem at 5 microsecond intervals (the “5us jitter problem”). And severe jitter with the AC coupled trigger mode, a problem which is also present on the DS2000 series scopes as well.

EEVblog #683 – Rigol DS1000Z & DS2000 Oscilloscope Jitter Problems - [Link]

9 Nov 2014

by TheSignalPathBlog @ yoututbe.com:

In this world exclusive episode, Shahriar takes a close look at the all new Tektronix Real-Time USB Spectrum Analyzer. The RSA306 has an RF bandwidth from 9kHz to 6.2GHz with a real-time analysis window of 40MHz. While being entirely powered form a single USB 3.0 interface, it provides a 100% Probably of Intercept for any signal event of at least 100us in duration. The RSA306 is compact, lightweight and shock resistant. At the same time Tektronix has made its Signal-Vu PC software with 17 measurement capabilities free and significantly reduced the price of other Signal-Vu advanced applications!
The SFDR, linearity, noise floor and phase noise of the instrument are all measured and presented. The unit is then used to capture and analyze an intermittent RF interference, analyze and demodulate an RF FM signal using an antenna as well as demodulation a 256-QAM signal with -65Bm of total power.

Tektronix RSA306 USB Real-Time Spectrum Analyzer Review and Experiments - [Link]

9 Nov 2014

Using the cirrus logic CS5464 for AC current measurement by Corgi-Tronics:

Continuing the series on examining devices to measure AC current, this time we’ll try out the CS5464 from Cirrus Logic. I initially built it up on a breadboard, but I’ll skip writing up this test and instead build up a prototype and run AC line power through it.

This is a Three-channel, Single-phase Power/Energy monitoring chip, and also can use current shunts and is intended for power meters.
This device provides no direct isolation, instead the entire device (input and output) directly coupled to the AC power line. Any isolation must be provided separately.

[via]

Using the cirrus logic CS5464 for AC current measurement - [Link]


3 Nov 2014

BitScpMicro

by elektor.com:

Farnell element14 have announced that they will be stocking the BitScope BS10 measurement device which combines a 2-channel USB oscilloscope, spectrum analyzer, 8-channel logic analyzer and function generator. You can use it with a PC running Windows or Linux, an Apple Mac or even a Raspberry Pi. Sampling rate is up to 40Msample/s giving it an analog bandwidth of 20MHz. The software supports frame rates beyond 20Hz and includes a ‘digital phosphor’ display mode. Resolution is up to 12bits.

Farnell element14 and the BitScope - [Link]

29 Oct 2014

WaterSoftenerMonitor

by robotroom.com:

Many homes in the United States have water that contains higher concentrations of dissolved minerals, which is called hard water. Although there is nothing toxic about hard water, it is less desirable for cleaning, it leaves mineral deposits, and it can shorten the lifetime or efficiency of equipment such as water heaters.

A water softener is a household appliance that commonly exchanges salt for some of the dissolved minerals, resulting in softer water. The salt supply is stored in a brine tank and must be refilled every month or so. If you forget to refill the tank, the water softener is rendered temporarily ineffective.

Water Softener LED Display - [Link]

27 Oct 2014

solarcontroller

by deba168 @ instructables.com:

One year ago, I began building my own solar system to provide power for my village house.Initially I made a LM317 based charge controller and an Energy meter for monitoring the system.Finally I made PWM charge controller.In April-2014 I posted my PWM solar charge controller designs on the web,it became very popular. Lots of people all over the world have built their own. So many students have made it for their college project by taking help from me.I got several mails every day from people with questions regarding hardware and software modification for different rated solar panel and battery. A very large percentage of the emails are regarding the modification of charge controller for a 12Volt solar system.

Arduino solar charge controller and energy monitor - [Link]

25 Oct 2014

by EEVblog @ youtube.com:

In this tutorial Dave demonstrates the seldom used and often little understood mathematical integration function available on your modern digital oscilloscope. And demonstrates a practical example use for it in accurately measuring the total power consumption of a microcontroller that sleeps and then wakes up and does some processing before shutting down again. By getting the total area under the current curve.

EEVblog #662- How & Why to use Integration on an Oscilloscope - [Link]

25 Oct 2014

by EEVblog @ youtube.com:

Dave shows you how to reverse engineer a PCB to get the schematic. In this case the new Rigol DS1054Z oscilloscope.
How does the discrete transistor analog front end and the software bandwidth limiting work?
How do you decode SMD transistor codes?
How does it compare to the old Rigol DS1052E?
Dave also discusses the low voltage ohms function of a mulitmeter, how it’s useful, and how to test your multimeter to see if it will have any issues with in-circuit testing.

EEVblog #675 – How To Reverse Engineer A Rigol DS1054Z - [Link]

22 Oct 2014

DDS

by Philippe Duboisset:

This project is an open source (hardware & software) DDS generator, based on: smart TFT module, AD9834, LM7171 fast amplifier. The homemade function generator is a quite common project on the internet. We can find different ways to do it:

– The quick & dirty way based on a DDS module bought on eBay
– The analog version based on a MAX038 / XR2206
– The “clean” way based on a FPGA and a fast DAC (e.g. http://www.circuitben.net/node/14)
– The software way (e.g. Arduino + R/2R DAC)

From my side, I wanted a small one which could fits my needs without being too expensive. According to me, such generator should at least:

– Be easy to use
– Output a signal from 1Vpp to 10Vpp (+/-5V), from 0 to 1MHz
– Have a low profile
– Without electric hazard (shall work on a 12V DC)

Tiny DDS – Open source DDS generator - [Link]



 
 
 

 

 

 

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