Voltage testers are not necessary if you already have a multimeter, but they can simplify your life if you
only want to test whether a powerline is powered or not. An other advantage is, that your expensive multimeter
can stay in its transportationbox without getting dirty. These testers are normally in a rugged case and can withstand
a use under hardest conditions and all this for real low prices. The tester we use is from Benning. The model CombiPol
solar contains a solar cell so that even simple continuity checks may be performed and is protected accordin to IP 65.
The maximum voltage is 650 volts. Voltage levels of 12, 50, 120, 230, 400, 690 volts are displayed by leds. Polarity
check for DC and phase/neutral detection for AC is possible.
Precision multimeters give you more accurate values, have an extended metering range, will give you a more comfortable
use, may normally be connected to a computer and offer in most cases other surplus. Prices for such an instrument will
start at about ten times of that you have to pay for a simple multimeter. Regular calibration of those instruments is highly
advised, as otherwise there will be not much precision left after a certain time. The periods for recalibration depend on
the usage and storage conditions of these devices.
The precision multimeter we use is a Gossen-Metrawatt MetraHit 18s. The voltage range is 300 mV to 1000 V (TRMS Crest-factor max. 5), the current range is 300 µA to 10 A (TRMS Crest-factor max. 5), resistance 300 Ohms to 30 MOhms, capacity 3 nF to 10000 µF, frequency 300 Hz to 100 kHz, temperature -200°C to +850°C (Pt 100 / Pt 1000), counter and time period, data and min/max memory, digital display ±31000 digit, analogue display ±35 scaleparts, automatic scaling. The accuracy is ±0.05% of measured value ±3 digits.
The instrument is enhanced by a 6-channel serial-bus memory interface (SI 232) which makes it possible to store measured values offline and to connect the instrument to a computer. If connected to the computer while mesurements are performed, the instrument may be partially controlled by the computer. The memory module is electicalliy insulated by an infrared interface. The software allows to use the instrument as datalogger, Yt-writer, or two instruments as XY-writer.
Installation tester for electrical installations according to DIN-VDE 0100 part 610, IEC 64-8, and HD 364-6-61.S1. This is a multipurpose
meter with some intelligence, that allows to check electrical installations for all protection measures that are necessary according to
several national codes. These measurements are prepared by internal calculations to receive the necessary values without manual
calculations. Thought for electricians to check out new, changed or enhanced installations, this instrument may also be useful in fire
investigations and (criminal) technical investigations, to find and check mainpulated circuits intended to set fire or to kill somebody, or
for the examination of accidental fatalities or injuries due to electric shock.
The instrument we use is from Gossen-Metrawatt the model ProfiTest 0100 S, enhanced by the printer/memory/interfacemodule ProfiTest PSI and enhanced by the RCD-blocker ProfiSkip, which is used to be able to perform measurements that that would otherwise trip an installed residual current device (RCD). This equipment makes it possible to perform all necessary measurements without noting anything, and to printout the results directly on location and to transfer the sampled data to a computer. The memory is grouped that way that data for every circuit, appartment and house measured can be identified afterwards. Adapters for poweroutlets in Germany, Switzerland, Great Britan, Italy and Denmark are availabe as well as adapters for tri-phase-systems with EC-poweroutlets 16A, 32A, and 63A. A good but expensive tool, which needs extensive and repeated training for correct application
Appliance checkers are used on the other side of the poweroutlet. These are instruments to check the electrical security of movable
electrical appliances after repair or change according to DIN VDE 0701 and 702.
The instrument we use is the SecuTest 0701/0702 S from Gossen-Metrawatt enhanced by the printer/memory module SecuTest PSI. Automatic recognition of protection class of the appliances as well as automated measurements are possible. An adapter for the test of single phase extension cords is available for this instrument, as well as an adapter for three phase plugs and CEE-plugs. An RS-232 interface is standard on this instrument.
Insulation meters, sometimes also called meggers, are used to check the insulation resistance at higher voltages.
Though both instruments described above (installation and appliance tester) are capable to perform standard insulation metering at 500 V, this instrument is a useful supplement as it offers insulation measurement at up to 1000 V. The instrument we choose is the Gossen-Metrawatt Metriso 1000 IR. It offer three different measurement voltages (250, 500, and 1000 V). The measurement range is 0 to 30 giga ohm. This shows that the name 'megger' is no longer correct and should now be 'gigger'...
E/M-field metering makes it possible to find out whether alternating electric and/or magnetic fields are present in the environment. This
makes it, for examlple, possible to determin, whether induction effects could have lead to an ignition.
We use the adapter FMA 1 from Gossen-Metrawatt, which may be attached to the precision multimeter MetraHit 18s. This combination offers a range from 0,0 to 30000.0 V/m with a resolution of 0.1 V/m for alternating electric fields and a range of 0.0 to 300.0 µT for alternating magnetic fields with a resolution of 0.1 µT in the frequency range from 16 Hz to 100 kHz. The basic accuracy of this adapter is ± 10 % of measured value for alternating electric fileds and ± 5 % of measured value for alternating magnetic fields.
The adapter is equipped with an IR-interface.
Detection of powered and non-powered cables in the ground or in walls is possible with the set of two tranmitters and a receiver. One of
those transmitters is battery powered, for the connection to non-powered cables, while the other, intended for the connection to powered
cables, is powered by the cable itself. The function is identical with both transmitters. The transmitter puts an RF-signal on the cable, which
can be detected via the receiver module. By selecting the transmitter signal strength and the receiver sensitivity, a wide detection range is
covered by this very useful tool.
Distances of up to two meters are no problem, as well as you may find out a single wire within a cable. The instrument set is made in the USA and distributed in Germany via Gossen-Metrawatt and ABB.
Ingenieurbüro Frank Markmann
Fax: (on request)