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9 Mar 2012

embedded-lab.com writes:

An LCR meter is an extremely useful device for measuring three basic impedance elements, namely, Inductance (L), Capacitance (C), and Resistance (R). Recently, I got a TENMA 72-8155 digital LCR meter from Newark for review. I was very excited to receive it as I didn’t have a dedicated LCR meter in my home lab. Here’s my quick review of this product.

TENMA 72-8155 digital LCR meter - [Link]

1 Mar 2012

HAMEG Instruments (a Rohde&Schwarz company) complements the successful HMO Series of DSO/MSO Oscilloscopes by also covering the lower bandwidth range of 70 to 200 MHz.

Recently, we introduced you new user-friendly oscilloscopes HAMEG, reach-featured already in a base version. They offer practically everything, what you can need at a usual work in development or repair, and who wishes to add functionality like I2C decoding or measuring of AC/DC currents, can do this by optional accessories. As we notified their supposed availability to this term, we already have them in stock and they are immediately available.

All types are MSO-ready – it suffices to connect a logic probe (option HO3508) in order to analyze 8 digital channels. With the known option HOO10 two freely selectable serial protocols of the types I2C, SPI and/or UART/RS-232 can be analyzed, hardware-supported and time-synchronous. This is possible both on the analog and the digital channels.

New is the option HOO11 which enable the analysis of these serial protocols on the analog channel. Even with the 2 channel instruments 3-wire buses such as SPI can be analyzed this way by making use of the external trigger input.(additional probe recommended)

Technical parameters:

  • 2 GSa/s Real Time
  • Low Noise Flash A/D Converter (Reference Class)
  • 2 MPts Memory, Memory zoom up to 50,000:1
  • MSO (Mixed Signal Opt. HO3508) with 8 Logic Channels
  • Serial Bus Trigger and Hardware accelerated Decode, I2C, SPI, UART/RS-232 (Opt. HOO10, HOO11)
  • 8 User definable Markers for easy Navigation
  • Pass/Fail Test based on Masks
  • Vertical Sensitivity 1 mV/div.
  • Offset Control ±0.2…±20 V (HMO20xx, HMO15xx)
  • 12 div. x-Axis Display Range, 20 div. y-Axis Display Range (VirtualScreen)
  • Trigger Modes: Slope, Video, Pulsewidth, Logic, Delayed, Event
  • Component Tester, 6 Digit Counter, Automeasurement, Formula Editor, Ratiocursor, FFT for Spectral Analysis
  • Crisp 16.5 cm (6.5”) TFT VGA Display, DVI Output
  • Lowest Noise Fan
  • 3 x USB for Mass Storage, Printer and Remote Control optional IEEE-488 (GPIB) or Ethernet/USB
  • Made in Germany

The HOO11 will be delivered with each HMO7xx, 10xx, 15xx, 20xx at no cost in the year of introduction.

New DSO Oscilloscopes from HAMEG - [Link]

28 Feb 2012

Sergei Bezrukov writes:

This project is based on Sensirion SHT15 humidity and temperature sensor. The sensor communicates with microcontroller by means of an I2C-like interface. Although this is a proprietary interface and not compatible with the standard I2C, it is very clearly described in the data-sheet.

I use the default 14-bit resolution for measuring the temperature and 12-bit resolution for humidity. The prototype also shows the atmosphere pressure sensor on the board and is an extension of the barometer project. This concerns usage of the pressure sensor, its interface with PIC, and communication with the LCD. The schematics below just shows the added parts to the barometer project.

Digital humidity meter - [Link]

25 Feb 2012

Sergei Bezrukov writes:

The device is intended for measuring luminance in the range 0.025 – 99999 lux. The lower limit is determined by the used sensor MAX44007, while the upper one is slightly less than the sensor’s one because no more than 5 digits fit on the LCD screen. Calibration of the sensor is provided by the manufacturer.

Digital Lux Meter - [Link]

25 Feb 2012

If you often work with batteries and SMT transistors, then the new UT132B multimeter is the right choice for you.

Into our offer we incorporated the new UT132B multimeter – a “brother” of the UT132D, type, which we have introduced to you recently. UT132B provides practically the same functions, including possibility to measure hfe of SMT transistors , NPN and PNP types in a SOT-23 package, by means of a special adapter. The difference between these two instruments is, that UT132B features measuring of 1.5V and 9V batteries status. That´s why it is ideal for everyone, who needs to simply and quickly judge status of batteries. Measuring of 1.5V batteries is proceeded at a 15 Ohms load and measuring of 9V batteries at a 1 kOhm load. The instrument has a HOLD function and a main switch, thus it is not necessary to turn a measuring ranges switch to switch off the device. Similarly like UT132D, also UT132B is very reliably and comfortably held in a hand thanks to compact dimensions and an ergonomic shape.

The new UNI-T multimeter even for testing of batteries - [Link]

24 Feb 2012

8 Oscilloscopes under €400 – Nut & Bolt – [via]

An oscilloscope is an essential tool when trying to understand what is going on inside your electronics. It is an expensive piece of kit: even a simple model costs several hundreds of euros/dollars. While it is possible to buy great second-hand analog oscilloscopes for a lot less, they are very bulky and don’t have the digital storage capabilities of modern oscilloscopes. In this post I’ll list the sub-€400 digital storage oscilloscopes I evaluated before purchasing one for Nut & Bolt.

8 Oscilloscopes under €400 reviewed - [Link]

24 Feb 2012

Sergei Bezrukov writes:

A device for detecting toxic gases is a must in every household. This particularly concerns carbon monoxide (CO), as most private houses are equipped with furnaces burning natural gas for heat. Any blocking of the exhaust pipes (e.g. a squirrel in a pipe, or heavy snowfall in winter) might lead to poisoning with lethal outcome.

Commercial devices for detecting CO are priced about $30 – $100 and are generally much more expensive than the ones for detecting CO2. Most of them just detect some presence of CO and launch an alarm without indicating the CO level. Building a CO-meter by yourself is not much less expensive than the cheapest commercial devices of that kind if we consider just the cost of components and their shipping. This is not that bad if you are doing electronics and already have many of them, but the sensor itself costs about $14. However, you can completely control your own device, program the alarm threshold, and adjust it for your needs. It is also worth mentioning that building your own device is at least a $100 fun :)

Digital carbon monoxide (CO) meter - [Link]

21 Feb 2012

diy.viktak.com writes:

The geek inside me has always wanted a fridge that shows the inside temperature for both the freezer and the fridge compartments. However, when we recently replaced our very old fridge we ended up getting a new one without the built in thermometer. So I decided that one of my next projects would have to rectify this problem.

Dual PIC Thermometer - [Link]

21 Feb 2012

z097dsa writes:

This is a project for a Russian IN-13 bargraph Nixie tube to use it as an indoor room thermometer. It is named “NixieTherm” and is also available as a fully complete kit incl. enclosure as shown at www.Nixiekits.eu

The IN-13 is a special construct of a gas discharge Neon display and works similar to the well know Neon bulb in illuminated mains power switches or as Nixie tubes. But this bargraph has a current depending length of the glow. As all other cold discharge tubes also the IN-13 needs a “little bit more” high voltage to work; at least 120VDC. The current through the tube must be limited, normally with a resistor. In the NixieTherm this is done with a high voltage transistor, as we need a variable current from 0….4.5mA.

Analog IN-13 bargraph Nixie tube thermometer - [Link]

19 Feb 2012

Sergei Bezrukov writes:

This is a shortened translation from Russian of my article published in Радио (Radio) magazine, no. 8 (2010) pp. 21-23. The voltmeter is designed for controlling DC voltages at the output of a dual bipolar power supply. It not a universal instrument, since its input resistance does not exceed 40K, which might be too low for some measurements. However, it is perfectly fine for power supplies and does not noticeably load their output. The range of input voltages is 0 to 24V for positive supply and -24V to 0 for negative one.

The voltages are sampled every 300 msec and displayed on a 9-digit LED display. Only 8 digits are used, the middle digit slot is always off and serves a a separator between negative (on the left part of display) and positive (on the right one) readings. The unit provides a 0.01V resolution. For small negative voltages (not exceeding 10V in absolute value) a leading minus sign is displayed. For positive voltages a leading zero is suppressed.

Voltmeter for bipolar power supplies - [Link]





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