In the case of the electrical industry, safety is critical and the codes and regulations that determine safe practices are both diverse and complicated. Employers, electricians, electrical system designers, inspectors, engineers, and architects must all comply with safety standards listed in the National Electrical Code, OSHA and NFPA 70E.
This is an old article from Practical Electronics 1979. It shows the input circuits and digital ranging controls too. Using 7107 chip for display it is an excellent project to build even today. Try this DMM out and improve your troubleshooting skills. - delabs
From Mag - Mains operated multimeter applications in mind,'for both professional/amateur users. The component board and mechanical construction is quite straightforward, and all the components are easily available. Over the past few years,
There are many different types of temperature measurement devices, each one tailored to meet a specific need. This fact sheet provides information on the types, use, and calibration of temperature measuring devices. It also provides guidelines for the selection and proper maintenance of common thermometers and temperature sensors.
Selection and Maintenance of Temperature Measurement Devices
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.
ICL7107 DPM and DVM chip from Intersil
BC556, BC557 and BC558 PNP Amplifier Transistors are not only popular today but very ancient, it is used as a General Purpose device and a popular LED control in small products.
This Silicon device along with some others replaced Germanium Devices in Preamplifiers and Portable Transistor Radios and Portable Tape Recorders. A Complement is the BC547B NPN General Purpose Transistor. Now for Specs 45V, 100mA, 200 beta approx.
The CD4093B consists of four Schmitt-trigger circuits. Each circuit functions as a 2-input NAND gate with Schmitt-trigger action on both inputs. The gate switches at different points for positive and negative-going signals.
The difference be-tween the positive (VTa) and the negative voltage (VTb)isdefined as hysteresis voltage (VH). All outputs have equal source and sink currents and con-form to standard B-series output drive.
74HCT373 - High Speed CMOS Logic Octal Transparent Latches with 3-State Outputs. The 'HCT373 devices are octal transparent D-type latches. When the latch-enable (LE) input is high, the Q outputs follow the data (D) inputs. When LE is low, the Q outputs are latched at the logic levels of the D inputs.
What it can do ? - This is like a Byte of Memory, A Byte means 8 Bits. A Bit Means one Input or Output Pin of an IC, Which understands Logic 1 is High and Logic 0 is Low.
At a frequency of 1 GHz, a short PCB track can become an Antenna ! One of the difficult areas in Electronic Product Design is RF sub-system or Communication Products. The Basics of RF System Design, Oscillator Design and Practical RF PCB Design.
If built and tested programmer properly setup for your PC, you can program a wide range of tested chips from many different manufacturers easy, reliable and fast. With adapters dip 42, dip 40, plcc 32, tsop 32, 40, 48, psop 44 package chips are also supported, the 4.0 and 4.5 board programmers have adapters on board to make it even more convenient.
Building it with a factory made board or a kit is not difficult if you have some experience with electronics. The software is easy to use and has all the functions you need.
The SPM-3 is a broadband and heterodyne level meter whose frequency range is is designed for balanced 1 20-channel systems. It can be powered from a built-in rechargeable rechargeable battery or from the mains. Buffer operation is also possible. possible.
The unit is easily transportable and simple to operate, making it well suited for the and is therefore well suited for the maintenance service.
