Multimeters are tools that can measure voltage, resistance and current. In 1820, a moving-pointer current-detecting device called the galvanometer was made. Galvanometers used what is called a Wheatstone bridge to measure resistance and voltage, comparing an unknown quantity to a reference voltage or resistance. Though these devices were indeed useful, they did prove to be impractical outside of a lab setting because of their bulkiness and delicate design. Easy to break!
Back in 1882 “The D'Arsonval–Weston” meter was developed. It used a moving coil which carried a pointer and rotated on pivot. It gave proportional measurement instead of simple detection and, rather than balancing a bridge, measurements were quick and easy as they were read off a scale. This was a definite improvement, but it still left a lot to be desired. For instance:
To read alternating currents or voltages, you need a rectifier. One of the earliest usable rectifiers was a copper oxide rectifier manufactured by Union Switch & Signal Company, Swissvale, around 1927. Another tool to be lugged around!
Interestingly, the word "multimeter" is listed by the Oxford English Dictionary to have been used from 1907.
The first multimeter invented is said to have been built by British Post Office engineer, Donald Macadie. He was fed up with carrying many separate individual instruments required for maintenance of telecommunications circuits. So, Macadie invented a multimeter which could measure amps, volts and ohms. The multifunctional meter was at that time called, the “Avometer”.
These days, Multimeters are still commonly used. Many engineers and electricians are glad of Macadie’s ingenuity, though they may not know it.
CAL-DUE UK Ltd are a components servicers and suppliers of PAT Testers and other tools. CAL-DUE also supply Multimeters. Howwood based company have over 24 years’ experience in calibration, repairs and sales, so you can have complete confidence in their service. The even have a hire service. Their work turnaround is 2-3 working days and can provide an urgent 1-2 working day calibration service. If you are a business, you’ll be happy to know that CAL-DUE can send annual calibration reminders, updated calibration plant lists, any necessary parts and all the work will be done under one roof, significantly reducing work turnaround time. The team at Howwood also use the newest instruments from major reputable suppliers such as: Fluke, Kewtech, Seaword, ETI Ltd, Clare, etc.
There’s no messing about with CAL-DUE.
If you need some Multimeters, Howwood is the place that is housing one of the most reputable suppliers in the business – CAL-DUE.
Whether you work in and electrical field, or you need temperature gauge instruments/calibration, pressure meters, or even torque measuring instrumentation, CAL-DUE have it all including the practical experience to either configure or repair equipment. In the event that a component is faulty, they can also supply you with a brand-new part and fast!
There’s no reason for you to not use one of the most trusted companies in the UK – CAL-DUE UK Ltd.
Call: 01412374643 / 07709065659
Email: info@cal-due.co.uk
