In a circuit with resistance, inductance, and capacitance, the opposition to the current flow in the circuit is referred to as impedance and is represented by Z.

(1) General Maintenance

Do not store or put the instrument under direct sunlight for a long time, especially the LCD display panel. Caution: Sprays, liquids or solvents are not allowed for the instrument or probe to avoid damage to the instrument or the probe.

(2) Cleaning

Check the instrument and probe frequently according to the operating conditions. Fellow the steps to clean the surfaces of the instrument.

Please use a soft cloth to wipe dust on the surface of the instrument and probe. When cleaning the LCD panel, be careful not to scratch the transparent protective film.

Power off the instrument first and wipe the instrument with a soft cloth.Use a mild detergent or water to clean if necessary.

Do not use any abrasive chemical cleaners as they may damage the instrument or the probe.

Warning: Make sure the instrument is completely dry before rebooting. Moisture may cause electrical short-circuit or even personal injury!

Correct settings but no waveform output

1) Check whether the BNC cable is properly connected to the channel output.

2) Check whether the key CH1 or CH2 is turned on.

3) Save the current settings of the instrument to a USB flash drive and "restore factory settings", then restart the instrument.

4) If the instrument still can't work normally, please contact your UNI-T dealer or local offices for support.

1) Check whether the USB flash drive device is working properly.

2) Make sure you are using Flash type USB flash drive device, this instrument does not support hard disk type USB flash drive device.

3) Restart the instrument and insert the USB flash drive again to see if it works properly.

4) If the USB flash drive still can not be recognized, please contact UNI-T dealer or local office and let us serve you.

If the generator still remains blank screen when power on.

1) Check whether the power supply is connected properly.

2) Check whether the power switch on the rear panel is set to "I".

3) Check whether the power switch on the front panel is connected .

4) Restart the instrument.

5) If the instrument still can't work normally, please contact your UNI-T dealer or local offices for support.

In order to reduce the non-linearity of the core material, inductors are generally measured with a large internal resistance of 100 ohms to reduce the test signal level. In order to compare the data with other competitor testers, it must ensure that they have the same internal resistance. Other modes are available as impedance options as long as this is consistent with the manufacturer's specified internal resistance test conditions.

The quality factor Q of an inductor indicates the degree to which the device approaches a pure reactance. A higher Q value indicates a larger absolute value of reactance, a smaller series resistance, and lower energy loss.

For capacitors, the purity is usually represented by the dissipation factor D, where D = 1/Q. Therefore, a smaller D value corresponds to a larger capacitive reactance and better efficiency.

The quality factor Q of an inductor indicates how close the device approaches pure reactance; the larger the quality factor, the greater the absolute value of the reactance.
For capacitor, this item indicating purity is usually expressed by the dissipation factor D, D=1/Q; therefore the smaller the D, the higher the capacitive reactance and the better the efficiency.

Has short circuit and open circuit zeroing been performed?
Confirm that short-circuit (for resistance) and open-circuit (for capacitance and inductance) compensation procedures have been correctly performed before testing.
Is the device under test a known standard source?
Ensure that the component being measured is a calibrated standard or a known reference. Using uncalibrated or damaged components as references can lead to inaccurate assumptions about error.
Is the range set to AUTO?
Check if the meter is set to AUTO range mode. In some cases, manually selecting the correct measurement range improves accuracy and stability.

DCR refers to the direct current resistance measurement mode.
It can measure the direct current impedance of electronic components such as coils and transformers.

1. There was a reverse connection during the testing of the test clip
2. The testing frequency is too high (the fundamental frequency of the electrolytic capacitor is as low as 120Hz or 1Khz)
3. Select test mode: electrolytic capacitors are suitable for parallel connection Cp