Instrumentation (Page 2)

Test and Measurement Technologies

Utility of Testing and Troubleshooting Tools : The first thing in Electrical testing is the Continuity Tester, Then we use the Neon Mains Screwdriver, Then we need an Voltmeter or an Ammeter. In electronics we need a OhmMeter and LCR meter too.

Many times we cannot carry big or expensive test instruments to the field, so we have to have a troubleshooting tool kit. Continuity testers, Logic Probes, DMM, Clamp Meters etc..

Simple Test Equipment

It also is sometimes required to build a quick jig or fixture with electronics to troubleshoot, simulate a problem or to test the reliability or aging of components and systems. Here you need to be cost effective, fast and innovative; and build a simple system with available, affordable or procurable resources. Hence a bit of circuit design, firmware and software are essential skills for production engineering.

Digital Multimeter DMM

Small Electronic Testing Tools

You can troubleshoot and repair Electronic Equipment easily with Meters and Continuity Testers.

Small Electronic Testing Tools – delabs

 

ICL7107 DPM and DVM chip from Intersil

The Intersil ICL7106 and ICL7107 are high performance, low power, 31/2 digit A/D converters. Included are seven segment decoders, display drivers, a reference, and a clock. The ICL7106 is designed to interface with a liquid crystal display (LCD) and includes a multiplexed backplane drive; the ICL7107 will directly drive an instrument size light emitting diode (LED) display.

3-1/2 digital display for +/- 199.9mV

DPM ICL7107 Digital Panel Meter

  • Guaranteed Zero Reading for 0V Input on All Scales
  • True Polarity at Zero for Precise Null Detection
  • 1pA Typical Input Current
  • True Differential Input and Reference, Direct Display Drive
  • LCD ICL7106, LED lCL7107
  • Low Power Dissipation – Typically Less Than 10mW

3-1/2 Digit DPM ICL7107 Digital Panel Meter

This is one of the first mixed CMOS IC, I used it after studying Intersil CMOS Hot Ideas Book. It is also the most widely used Display chip. Many Millions of Instruments are built using this chip both in Instrumentation and Industrial Automation. The ICL7106 was most popular in Hand Held DMM’s and Clamp Meters as it used to drive a LCD Display. ICL7109 was to interface with Digital Comparators and Microprocessors

ICL7109 12-Bit A/D Converter with 3-State Binary Outputs

Ever wanted to develop a Professional High Speed DAQ or a Storage Oscilloscope or even a High Speed Communications grade Logic Analyzer. Here is a front end Analog Mixed Chip with Eval Board.

You could make a High Speed Test Instrument and probably build a tablet app front end. How would a 200 M Hz Oscilloscope look on you 10 inch tablet. You will float in the clouds. – delabs

The DRS chip is a full custom Integrated Circuit developed at PSI, Switzerland. It contains a switched capacitor array (SCA) with 1024 cells, capable of digitizing eight analog signals with high speed (6 GSPS) and high accuracy (11.5 bit SNR) on a single chip.

DRS4 Evaluation Board - Paul Scherrer Institut
DRS4 Evaluation Board – Paul Scherrer Institut

By using channel cascading, we can configure this board with 2048 bins for each channel at the expense of a lower analog bandwidth of about 500 MHz. The on-board comparators enables the board to do a self-triggering on a programmed level of any of the input channels or logical combination of channels, much like an oscilloscope.

Highlights of Board with One DRS4 chip

  • Four 50-Ohm terminated input channels with SMA connectors
  • Active input buffers which result in an analog bandwidth of 700 MHz (-3dB).
  • One AD9245 ADC to digitize signals from the DRS4 chip
  • One Xilinx Spartan 3 FPGA for readout control
  • A 16-bit DAC to generate all on-board control voltages
  • A serial EEPROM containing serial number and calibration information
  • Internal trigger with user-defined thresholds on any of the four channes.

CheapStat: An Open-Source, “Do-It-Yourself” Potentiostat for Analytical and Educational Applications.

CheapStat – DIY Potentiostat

CheapStat, an inexpensive (<$80), open-source (software and hardware), hand-held potentiostat that can be constructed by anyone who is proficient at assembling circuits. This device supports a number of potential waveforms necessary to perform cyclic, square wave, linear sweep and anodic stripping voltammetry.

CheapStat - DIY Potentiostat

The device supports cyclic, square wave, linear sweep and stripping voltammetry over the potential range ?990to +990 mV and over frequencies from 1 to 1000 Hz. The device supports a range of environmental, food and drug quality control, and educational applications. The reverse of the circuit board supports a three-line LCD display and a joystick, which is used to select an experiment protocol, change its parameters (frequency, starting voltage, end voltage, scan rate), and initiate the experiment.

DIY Potentiostat – CheapStat – EEMetric

The device’s schematics, parts lists, circuit board layout files, sample experiments, and detailed assembly instructions are available in the supporting information and are released under an open hardware license.