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Ihr Warenkorb ist leerDie professionelle Fehlerstromzange HT79 ermöglicht komfortable und genaue Messungen von kleinen Strömen (Ableit-, Differenz- und Fehlerströme ab 0,1mA AC/DC) und eignet sich besonders aufgrund der DC Empfindlichkeit zur Fehlersuche bei der KFZ-Elektrik und Messung von 4-20mA Prozess-Signalen ohne die Stromschleife unterbrechen zu müssen. Die HT79 verfügt zusätzlich über zahlreiche Multimeterfunktionen wie z.B. eine AC und DC Spannungsmessung sowie eine Widerstands- und Durchgangsprüfung mit akustischem Summer.
Daniel Ardelian
Bewertet in Deutschland am 28. Mai 2024
Pros:It has very good accuracy. I have compared it with a Fluke 87-V set up for direct measurement.It has high sensitivity, currents as low as 1 mA can be measured (both AC and DC).DC measurements work very well, it is stable after ZERO-ing. It can also measure pulsed DC (half wave rectified DC from 50 Hz sine AC passed through a resistor) and it shows the same AC and DC value as the Fluke 87-V direct measurement.It really is True RMS, I have tested it with non-sinusoidal waveforms and it showed the same value as the Fluke 87-V direct measurement.The manual states that AC bandwidth is 50 - 60 Hz, but I have tested it from 10 Hz up to 20 KHz with sine / square / triangle waveform.10 Hz sine wave: 20 mA Fluke 87-V, 19.5 mA HT7915 KHz sine wave: 20 mA Fluke 87-V, 19.8 mA HT7920 KHz sine wave: 20 mA Fluke 87-V, 18.2 mA HT79The build quality is very good, it feels solid.After testing it a bit more, I have accidentally discovered that it has an undocumented feature to select a manual range if you press the HOLD button for more than 2 seconds. This is not shown in the manual but it is very useful because if you measure a current that is unstable and just on the threshold of switching from one range to the next (e.g. around 300 mA), you will not be able to see a stable reading with the default AUTORANGE setting because it keeps changing the range up and down.Cons:It would be good to have a Low-Pass filter option to exclude higher frequency harmonics from the measurement, because typically Type AC and Type A RCDs do not respond to high frequency leakage current (although it is known that 150 Hz harmonics increase the sensitivity of Type A RCDs to 50 Hz leakage).
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