AC/DC Clamp Meters: UNI-T

UNI-T: A clamp meter allows to measure AC/DC using simple non-contact method, with the ferrites and electromagnetic induction. An irreplaceable instrument for the autoservices, and for work with electrics and power electronics. Manufacturers: UNI-T, Mastech, Fluke, Pro'sKit.
ID: 844701
Large high-precision clamp meter designed for the measurement of AC current leakage, current and voltage. Range: 0.001 mA - 2000 A.
ID: 844698
Designed for measuring three-phase AC voltage and current, phase angles between voltages, currents or both, frequency, phase sequence, active, reactive and apparent power, power factor, sum of current vector.
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USD 379
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USD 610
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ID: 834636
The reliable True RMS digital clamp meter measures AC voltage and current, active power, apparent power, reactive power, power factor, phase angle, frequency and active energy.
ID: 834634
The reliable digital clamp meter measures AC/DC voltage and current, resistance, frequency, capacitance, duty cycle and performes diode check and continuity test.
Availability in stock:
HKEUCN
USD 220
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Availability in stock:
HKEUCN
USD 40
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ID: 833206
Measures AC voltage and current, active, apparent and reactive power, frequency, active energy. Supports PC-connection.
ID: 822358
The clamp multimeter with overload protection measures AC and DC voltage, AC current, resistance and temperature, also performing diode check and continuity test.
Availability in stock:
HKEUCN
USD 180
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Availability in stock:
HKEUCN
USD 24
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ID: 822368
The clamp multimeter measures AC/DC voltage and current, resistance, frequency, duty cycle, also performing diode check and continuity test.
ID: 822365
Digital clamp meter measures AC and DC voltage, AC current, resistance, frequency and temperature, also performing diode check and continuity test.
Availability in stock:
HKEUCN
Promotion:USD 65
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Availability in stock:
HKEUCN
USD 54
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ID: 844704
The reliable True RMS digital clamp meter for measuring AC/DC current, AC/DC voltage, resistance, frequency and performing diode check and continuity test.
ID: 822362
The reliable clamp multimeter measures AC/DC voltage and current, resistance, frequency, duty cycle and performes diode check and continuity test.
Availability in stock:
HKEUCN
USD 110
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Availability in stock:
HKEUCN
USD 35
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ID: 840025
The reliable device for measuring AC and DC voltage, AC current, resistance, frequency, duty cycle, performing diode check and continuity test.
ID: 822367
The clamp multimeter measures AC/DC voltage and current, in-rush starting current, resistance, frequency, duty cycle and temperature, also performing diode check and continuity test.
Availability in stock:
HKEUCN
USD 22
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Availability in stock:
HKEUCN
USD 82
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ID: 844695
High-precision clamp meter designed for the measurement of AC current leakage. Range: 0.001 mA - 600.0 A.
ID: 834635
Handheld digital clamp meter that can measure voltage, current, active power, apparent power, reactive power, power factor, phase angle, frequency, active energy and phase sequence.
Availability in stock:
HKEUCN
USD 140
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Availability in stock:
HKEUCN
USD 195
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ID: 822366
The clamp multimeter measures AC/DC voltage and current, resistance, frequency, duty cycle, temperature, and performes diode check and continuity test.
ID: 844703
The reliable digital clamp meter for measuring AC current, AC/DC voltage, resistance and performing diode check and continuity test.
Availability in stock:
HKEUCN
USD 64
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Availability in stock:
HKEUCN
USD 65
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ID: 838895
The reliable digital clamp meter which measures AC and DC voltage, AC current, resistance, frequency, temperature, and performs diode check and continuity test.
ID: 845327
The reliable digital clamp meter which measures AC and DC voltage, AC current, resistance and performs diode check and continuity test.
Availability in stock:
HKEUCN
USD 45
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Availability in stock:
HKEUCN
USD 13
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ID: 822378
The power meter measuring AC voltage and current, active, apparent and reactive power, temperature, frequency, active energy.Supports PC-connection.
ID: 845328
The reliable digital clamp meter which measures AC and DC voltage, AC current, resistance and performs diode check and continuity test.
Availability in stock:
HKEUCN
USD 140
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Availability in stock:
HKEUCN
USD 22
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ID: 854599
True RMS mini clamp meter for measuring AC current up to 200 A.
ID: 864110
Digital clamp meter for measuring AC/DC voltage, AC/DC current, resistance, capacitance, frequency and temperature, performing NCV test.
Availability in stock:
HKEUCN
USD 52
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Out of stock
Availability in stock:
HKEUCN
USD 54
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Out of stock
ID: 847051
Digital clamp meter for measuring AC/DC voltage and current, in-rush starting current, resistance, frequency, duty cycle and temperature, and performing diode check and continuity test.
ID: 855702
The reliable digital clamp meter which measures AC and DC voltage, AC current, resistance and performs diode check and continuity test.
Availability in stock:
HKEUCN
USD 87
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Out of stock
Availability in stock:
HKEUCN
USD 20
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Out of stock
ID: 855804
Digital clamp meter with OLED display measures AC/DC voltage, AC/DC current, resistance, capacitance, frequency and temperature, also performing diode check and continuity test.
ID: 864109
Digital clamp meter for measuring AC/DC voltage, AC/DC current, resistance, capacitance, frequency and temperature, performing NCV test.
Availability in stock:
HKEUCN
USD 130
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Out of stock
Availability in stock:
HKEUCN
USD 79
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Out of stock
ID: 863640
Clamp multimeter for measuring AC/DC voltage and current, resistance, frequency, temperature, capacitance, duty cycle, also performing diode check and continuity test.
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HKEUCN
Expected soon

Clamp Meter - an Irreplaceable Tool for Measuring Electrical Currents

Clamp meter (also referred to as tong tester or clamp-on ammeter) is a very useful and convenient measuring tool widely used by electrical engineers all over the world. The main function of a clamp meter is measuring electric current properties of conductors without the need to interrupt an electrical circuit or physically touch the wires. They may also be supplemented with additional functionality, such as measurements of voltage, resistance, capacitance, frequency, temperature etc. This device makes conducting measurements very easy and convenient, especially in uncomfortable or hard to reach places. It is very often confused with a regular multimeter or misconceived as a multimeter with clamps instead of test lead. Though quite similar, their main functionality does differ, as the main function of a multimeter is voltage measurement, which is only sometimes supplemented with the ability to measure currents.

Depending on the method of measurements clamp meters are divided into AC current and DC current measurement devices. The first type uses an electromagnetic induction principle to conduct measurements while the second type uses a Hall Effect principle for theirs. The induction method is not that accurate and is only suitable for measuring high AC currents. Hall Effect method, on the other hand, is very precise and can measure DC and AC currents of both high and low magnitude.

The main part of an AC clamp meter is a current transformer, located in its jaws. It is a well-known fact that electric current produces a magnetic field around the wire that it flows through. Because of the alternating current’s tendency to frequently reverse its polarity, dynamic fluctuations (which are proportional to the current flow) appear in the magnetic field. These fluctuations are detected by the current transformer and converted to an AC current reading.

Obviously, this method cannot be used in DC clamp meters. DC current does not change its polarity, no fluctuations of the magnetic field appear around the wire and, therefore, a current transformer is not able to detect any current flow. A Hall Effect method had to be introduced in the meter in order to make it possible to measure DC currents. The main part of such meter is a Hall Effect sensor. It is located at the edge of one of the jaws, in the place where both jaws touch. The magnetic field around the wire causes a voltage (proportional to the current) to appear across the Hall Effect sensor. It is then amplified and measured.

Just as with any other measuring equipment, clamp meters wary in both price and feature range: from a cheaper ones with only basic features to expensive specialized ones that have a wide range of features. Some of the most popular features are:

  • Data logging. Some models are supplied with a built in memory that allows recording several measurement results.
  • Connecting to PC. More and more often these devices are provided with special software and an ability to be connected to a computer (usually via a USB cable). This allows all the measurement data to be transferred to a computer where it can be manipulated, analyzed and organized.
  • Auto range. Some devices can set a measurement range automatically so that there is no need adjusting the switch to the right position to obtain accurate results.
  • True RMS (Root Mean Square). True RMS provides more accurate AC current measurements by converting AC signal to an equivalent DC current signal.

The complete list includes a lot more additional features. Therefore, it is very important to consider what will be the primary use of the device when choosing one.

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