1. Product Use

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.

Typically, the infrared thermometer makes laser point as an indication of the measured range. The principle of infrared thermometer is the average temperature within the measured circle, if there are multiple temperature points within the circle or the measured circle exceeds the measured object, the measured temperature may be inaccurate, in such case, if infrared thermometer with dual lasers is used, the range of the measured circle can be obtained accurately, to prevent over range of measured temperature, inaccurate temperature, and other issues.

Because of the design.
The test principle of earth clamp tester: The clamp jaw needs to emit a magnetic field with high power so as to generate current for measurement of earthed conductor, so the clamp jaw keeps buzzing, but it does not affect the measurement.

No, the applicable AC voltage of RCD tester is 195V~253V, the three-phase voltage is 380V.

For insulation test, the insulation resistance at a certain moment can not entirely reflect the insulation performance of tested object, as the insulation resistance absorbs and polarizes electric charges after high voltage is applied on the insulation material. For insulation tests on sites with main transformers, cables, motors and others, absorption ratio (the ratio between R60s and R15s) and polarization index (the ratio between R10min and R1min) should be measured, so as to determine the insulation performance.

This phenomenon is normal. 5.5GΩ will be displayed when the insulation resistance of measured object exceeds the specified range of the tester, it is recommended to test an object with resitance below 5GΩ.

The multimeter has relative measurement mode. Press REL button to enter relative mode. Take capacitance measurement as an example, when REL button is pressed, the displayed capacitance will be reset. To obtain the measured value, the open-circuit value will be subtracted by the displayed value.
Measured value = Displayed value – Open-circuit value
Note: It is recommended to perform measurement in REL mode if the measured capacitance is ≤1uF.

Because the air is moist and the moisture content in the vaseline applied on the PCB pad is increased. Please wipe out the vaseline on the PCB pad and apply new vaseline, or perform measurement when the air is dry.

Answer 1: DC and wave form are displayed on the screen, DC indicates the multimeter is in DC mode, and wave form indicates AC voltage measurement. Please press AUTO button to switch to AC mode.

Answer 2: Turn the rotary switch to corresponding measurement gear (AC or DC gear). If the measured signal is not known, please press AUTO button so as to detect the optimum test signal.