• Product Use

Clamp the single core when performing current measurement through clamp meter, the clamp meter calculates the current by inducing surrounding magnetic fields. If live and neutral wires are measured together, the directions of magnetic fields of both wires will be offset, so the measured current is zero constantly. Please clamp a live wire by the clamp jaw to perform current measurement.

Because the sensitivity of camp jaw is relatively poor and large error will occur when performing measurement of small current through clamp meter with large range. It is recommended to use clamp meter with small range.

For AC current measurement:
It is affected by electromagnetic field. The clamp jaw is designed with hall component (a sensitive device), sensitive with magnetism, heat and mechanical stress to some extents. When the clamp meter is interfered by the electromagnetic field in the measurement environment, the reading will be changed or can not be reset.

For DC current measurement:
After measurement of large current, there will be residual magnetism at the clamp jaw for some time, and the least significant digit will be displayed on the LCD. Please long press REL to reset the reading.

Not same.
For peak measurement: Maintain the MAX/MIN value of pulse signal automatically, the response time of logging MAX/MIN peak value is short (about 250us), a transient value can be measured accurately through this function. Peak voltage and current can be observed at the moment of startup of equipment.
For MAX measurement: It refers to the maximum value within a certain time.

The accuracy can be guaranteed at 10% of the range, for example, if the minimum range at AC current gear of UT211A is 600mA, the minimum current that UT211A can measure will be 60mA.

Low pass filter is built in clamp meter with LPF function, typically, this function is used to measure PWM output signal of frequency converter, the high frequency will be filtered during measurement so as to measure signal of fundamental wave.

For example:
1. The frequency converter will interfere the electric circuit at a high frequency for variable-frequency motor.
2. Be sure that voltage and frequency can be measured accurately for variable-frequency drive.

Due to the design of the multimeter, a reference value is needed when measuring large resistance (200M) through multimeter with old design, so a resistance value will be displayed. 1M for 1999-count multimeter, 10M for 19999-count multimeter, this value should be subtracted.

NCV refers to Non-Contact Voltage Detection.
To detect if AC voltage or electromagnetic field exists, bring the front end of the clamp meter to get close to the measured conductor, if the voltage of electric field is greater than the specified voltage (100V), the buzzer will make sounds and the LED will flash or lights up constantly.

On the condition that the measured equipment is powered off:
Firstly, clamp the measured cable through clamp meter.
Secondly, set the clamp meter to a right gear.
Thirdly, press down INRUSH button.
Last, power on the measured equipment, then the starting current of measured equipment will measured and obtained.
This function is typically used to measure starting current of motor or other inductive loads. UT216C has this function.

As a temperature compensation circuit is designed inside the meter, the ambient temperature will be displayed without the temperature probe connected.

Please note the points mentioned below when using infrared thermometer:

1. Distance Coefficient Proportion (D:S): This represents the proportion between the distance (from thermometer probe to target) to the diameter of the target. If the target is small and the test distance is long, please select thermometer with high distance coefficient. Note: The range of distance efficient for UNI-T infrared thermometers is between 10:1 to 50:1.
2. Emission Rate: This rate is the representation of material energy radiation. The emission rate and the surface characteristics of target material determines the corresponding wave length of spectrum of thermometer. The emission rate of alloy material with high reflectivity is low or variable. The emission rate of most organic materials, paintings or surface with oxidation treatment is about 0.95. As the emission rates of different objects are different, please adjust the emission rate to correct the measured temperature. Note: Please refer to the “Emission Rate Lists” in the user manual.

As we all know, it’s important to adjust the emission rate when using the infrared thermometer, but how can we know the emission rate of the target object? The recognized emission rates of materials including metal and non-metal materials can be searched on line typically, there are two methods for reference if corresponding emission rate is not found out:

1. Apply black adhesive on the measured object to change the emission rate of the target to 0.95.
2. Measure temperature through contact-type thermometer, and then adjust the emission rate of infrared thermometer so as to make it consistent with the reading of contact-type thermometer, by doing so, the emission rate of target object can be obtained.