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No hay artículos en el carroEl EX655 es un medidor de pinza de CA/CC RMS verdadero de 600 A. Este medidor de pinza también mide voltaje de CA/CC, resistencia, capacitancia, frecuencia, temperatura, prueba de continuidad/diodo y cuenta con un detector de VSC. El EX655 tiene un tamaño de mandíbula de 1,18" que se adapta a conductores de hasta 350 MCM. Este medidor también incluye una pantalla LCD retroiluminada con conteo de 6.000, retención de datos, mín./máx., función relativa, filtro de paso bajo, modo de corriente de entrada, función de cero CC, gráfica de barras de tendencia LCD, apagado automático y una luz de trabajo LED conveniente.
domore
Comentado en los Estados Unidos el 9 de junio de 2021
I have owned two Extech instruments over the last few years. First was a multimeter that I returned due to the failure of the instrument to correctly measure mA. This was a failure of design, not of a particular instrument build or calibration. Extech acknowledged the failure but could not change the design.I purchased this EX655 in particular to measure the delta of the starting amperage from adding a start capacitor kit to my 5 ton HVAC compressor. All other instruments that I investigated in this price range published a sample rate of approximately 300 msec. This instrument claims that it measures(in INRUSH mode) the first 100 msec of a motor start event and then displays the RMS value over this time period. After making this claim, the literature then states that the values don't have an associated accuracy and are for reference only. This disclaimer is a key point of note.In practice, I took multiple measurements with the INRUSH mode both before and after the start cap install and the values differed by much less than I had hoped. Maximum start current(INRUSH) was 141A before the install and the range after the installation for multiple starts was 123A to 141A. So no change in starting current is confirmed. Considering that the motor is just a resistor(heater) until the back EMF becomes significant, one could argue that in the first 100 msec of the start event the compressor does not have enough speed either way to affect the current significantly and thus the two measurements may actually be the same for this time period. In this case, the instrument could be correct.So, exit the INRUSH mode, set the EX655 for AC current regular mode and apply the peak hold function. We are now back in the 300 msec update rate and the results become interesting. With the start capacitor in the system, the peak current capture is around 50A, which is far below the manufactures nameplate LRA of around 150A. So, I take the start cap out of the circuit and restart the compressor. The EX655 repeatedly displays OL for the max reading. I'm pretty sure I'm not drawing over 600A on a 60A breaker. So again, it appears Extech has a design flaw in it's autoranging function that locks the max current reading in at OL on a 60A range before the instrument switches over to it's 600A range. There is no way to set the current range manually for this instrument.So, the main reason I purchased the instrument is flawed in it's accuracy and the fallback position of using a slower sample rate fails because of the autoranging feature.In other news, the display is difficult to read and the instrument response rate is slow. You have to be patient as the autoranging feature steps through the ranges before the instrument can display a value. I have used the AC amperage, AC amperage INRUSH, resistance and capacitance features only at this time. All measurements for these functions seem reasonable, but again, the instrument is slow.I have not decided whether to keep or return.
Mehmet
Comentado en los Estados Unidos el 9 de diciembre de 2019
As described
Genci
Comentado en Canadá el 19 de abril de 2019
It's responsive and works well.Don't like so much the "off" dial setting which is not on the very bottom setting and in so many cases you miss to switch off and hear a beep after you put it on the bag.
sophijami
Comentado en los Estados Unidos el 29 de marzo de 2017
very good value. its for professionals
Karl
Comentado en los Estados Unidos el 19 de diciembre de 2016
The Extech EX655 clamp meter is a solid feeling mid-priced unit that adds several features over a basic multimeter: current measurement of AC or DC currents via the clamp (which must clamp just a single wire), non-contact AC voltage detector, min/max capability, and a temperature probe.I found the display challenging to read in all but very bright conditions because it is inset within the device so deeply as to be shadowed by the case. Pressing the light button was hit or miss if the internal light would illuminate the display and even when that did work, the light went out too soon for me to complete my measurements without having to press it again. It is convenient to have a light to illuminate the clamps if you're working in low-light conditions while aiming for a wire. But, the button is located right where my thumb would be gripping the meter to open the clamp, making it uncomfortable NOT pressing the button in normal conditions. It also seems weird to me that the clamp light does not also automatically cause the display light to illuminate, as I'd think if you can't see the wire you're clamping, you won't be able to see the display either... so the display light requires a separate/awkward press-and-hold.The temperature probe was quite inaccurate for temps below zero F, reading -1 when it should have read -15. Checking DC amperage on either negative or positive cables in my car resulted in wildly swinging numbers. I've never had a clamp meter before, so don't know if that it so be expected (vs some reasonable measurement) or if the idea is just to confirm that current is slowing.Overall, for my capability to judge, the meter seems fine, but not as readable and usable for measurements where you'd use the test leads as Extech's standard multimeters which have a better display and a kick-stand to hold the meter up at a decent viewing angle. If you don't need the clamp meter functionality, get a standard multimeter and a separate, inexpensive, non-contact AC voltage detector.
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