TEST & MEASUREMENT FEATURE Electrical measurement
Testo has launched a new range of intelligent electrical measuring instruments, designed to enable users to carry out their daily measurement tasks more easily, safely and efficiently than before. Rachael Morling reports
A Right:
There are three models in the Testo 760 family of automatic multimeters
s an expert in measurement solutions, Testo’s instruments are used
in areas such as refrigeration, air conditioning and environmental technology, industrial applications, for exhaust and flue gas analysis, in the pharmaceutical and health sectors, and for monitoring indoor air and food quality. The company realised, however, that it
had a hole in its portfolio. So, following global research, and believing that there was a place in the market for ‘real innovation’, Testo introduced a new range of electrical measuring instruments. According to the company, its new
instruments – there are five product families, with 12 products available, covering the entire spectrum of electrical measurement parameters from one provider – offer beneficial features such as user-friendliness and intelligence. These, the company explains, make it possible for users to carry out their daily measurement tasks more easily, safely and efficiently than ever before. There are already many solutions
available on the market for different measurement parameters, so Testo didn’t want to launch another ‘me too’ instrument. In particular, it wanted to provide instruments that enable contractors in the fields of heating, ventilation, air conditioning and refrigeration to work more efficiently.
The 750 voltage tester
The 770 clamp meter’s have two pincer arms, one of which can be fully retracted into the
instrument, meaning that cables in tight switching cabinets can be easily grabbed
MULTIMETERS According to Mike Murley, business unit manager HVAC/R, multimeters are the flagship for every electrical instrument supplier. However, he said: “Manufacturers have accepted the limitations of the standard digital multimeter. For example, none of the existing products on the market are forgiving with users who inadvertently select the wrong test with the rotary switch, or put the test leads into the wrong sockets. At best the existing instruments blow a fuse, and at worst they blow an internal component rendering the instrument useless or cause injury to the operator. The Health and Safety Executive guidance note GS38 even mentions incorrect selection of current or voltage measurement on a multimeter as a cause of injuries.”
current and voltage area, all three instruments detect direct and alternating current and select other parameters such as resistance, continuity, diode and capacitance automatically. The Testo 770-1 model is the standard
version for daily measuring tasks, including starting current measurement. The 770-2 also has a μA range as well as an integrated temperature adapter for all type K thermocouples; while the 770-3 offers a performance measurement function and can be connected with the Testo Smart Probes App by Bluetooth.
To help, the new Testo 760 is said to be
the first automatic multimeter. This family comprises three models. With these, function keys replace the traditional dial, which means easier operation and greater reliability. Incorrect settings are now impossible, the company explains, because the measurement parameters are detected automatically via the assignment of the measuring sockets and also shown by the illumination of the appropriate function keys. When the user puts test leads in the voltage measurement ports the instrument automatically configures itself for voltage measurement. The Testo 760-1 model is the standard
version for virtually all daily measuring tasks. The 760-2 is differentiated by a larger current measurement range, the true root mean square measurement - TRMS - and a low-pass filter. The 760-3, meanwhile, is the model with the highest specification and, in addition to the features of the other two models, it has a voltage range of up to 1000V, along with higher measuring ranges for frequency and capacitance.
CLAMP METERS There are three instruments in the 770 clamp meter family, which are suitable for current measurement in switching cabinets. With this, one of the two pincer arms can be fully retracted into the instrument, meaning that cables in tight switching cabinets can be easily grabbed. The automatic measurement parameter detection also ensures reliable work: in the
CURRENT/VOLTAGE TESTING The 755 family are voltage testers which can also measure current. Each time they are used they automatically select the right settings, and both have all the important functions for determining voltage/de-energisation, for measuring current and resistance, as well as for continuity tests. Not only do these have an integrated
flashlight, but the measuring tips can be changed easily so that the whole instrument does not need to be replaced in the event of damage. The Testo 755-2 model is differentiated by the larger current range of up to 1000V and functions such as the single pole phase testing and rotating magnetic field measurement.
VOLTAGE TESTER WITH LED DISPLAY The display on the Testo 750 voltage tester family can be seen from any position. This, the company states, guarantees an ideal voltage indication thanks to its fibre optics. All three models meet the latest
voltage tester standard EN 61243- 3:2010 and have a safety specification according to CAT IV. The 750-2 is also suitable for single pole voltage testing and has a flashlight along with an RC trigger function. Vibrating load buttons ensure that trigger tests cannot be carried out accidentally. In addition, the Testo 750-3 is fitted with an LC display to show the current reading.
NON-CONTACT VOLTAGE TESTING The Testo 745 non-contact voltage tester has a voltage range of up to 1000V and is particularly well-suited to fast initial checking of any suspected fault sources. When the presence of voltage is determined, this gives a warning via a clear visual and acoustic signal. In order to increase reliability, the voltage tester has a filter for high-frequency interference signals and is also waterproof and dustproof according to IP67.
Testo
www.testolimited.com
/ INSTRUMENTATION INSTRUMENTATION | JULY/AUGUST 2016 33
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64