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13

Oct

2022

Inspection method and precautions for low voltage test pen

In the communication circuit, the wire that can make the neon tube glow after being touched by the electroscope is the phase wire, and the wire that does not shine is the zero wire
13

Oct

2022

Electricians need to be familiar with application formulas--smart use of low-...

(1) Judging AC and DC Formulas The electric pen determines AC and DC, AC is bright and DC is dark, the AC neon tube is bright, and the DC neon tube is bright at one end. Note: Firs
13

Oct

2022

New AC Voltage Test Pen

one. performance: 1. With a bright LED light, not only the power consumption is small, but also the brightness is high. 2. It has 30V-1000V AC voltage electromagnetic field inducti
13

Oct

2022

Introduction to the design process of multi-purpose electric test pen

1. Making materials 1. 3 npn type low-power transistors, 2 button batteries, 1 100Ω resistor, 1 light-emitting diode, and 1 common test pen. 2. Tools, soldering iron, tweezers, dia
13

Oct

2022

Several Measuring Methods of Digital Display Electric Test Pen

(1) Direct measurement method The direct measurement method refers to the measurement method in which the probe of the electric test pen directly contacts the measured object to ju
13

Oct

2022

The 5 major functions of the test pen

(1) Determine the presence or absence of voltage. When testing the object under test, if the neon tube of the test pen is on, it means that the object under test has a voltage, and
13

Oct

2022

The working principle of light-emitting diode test pen

As we all know, the test current allowed by the test pen is generally microampere. Such a small current cannot directly drive the light-emitting tube to emit light and piezoelectri
13

Oct

2022

How to judge the polarity of a crystal diode with a test pen

Estimate small capacitors. A test pen can roughly estimate capacitors from a dozen picofarads to a few tenths of a microfarad, as shown in Figure 14. At the beginning, you can see
13

Oct

2022

Measuring small-capacity capacitors with a test pen

Estimate small capacitors. The test pen can roughly estimate the capacitors from a dozen picofarads to a few tenths of a microfarad. At first, you can see the capacitor charging pr
13

Oct

2022

Measuring 220V AC Current by Induction Method with Electric Pen

Check whether the electrical appliance is connected to the protective grounding wire. For electrical appliances with good insulation performance between the metal casing and the po
13

Oct

2022

A few tricks you don't know about the electric test pen

① Before checking whether the electrical appliances and lines are electrified, you should first test them in a place with electricity to see if the test pen is intact, so as to pre
13

Oct

2022

Several detection methods of electric test pen

Direct detection: a. The last number is the measured voltage value; b. When 70% of the high-break display value is not reached, the low-break value is displayed; c. When measuring
13

Oct

2022

How to use an electric pen skillfully?

①Determine the formula of alternating current and direct current The electric pen judges AC and DC, AC is bright and DC is dark, The AC neon tube is bright through the whole body,
13

Oct

2022

The function and usage skills of the electric test pen

Function 1: Measure whether there is voltage in the line This is one of the most commonly used functions of a test pen, which is to hold the pen in the correct position and touch t
13

Oct

2022

Use a test pen to test the positive and negative poles of the DC power supply

The commonly used test pen is shown in Figure 7-33. When in use, hold the cap of the pen and let your fingers touch the metal pen, and let the tip of the pen contact the charged bo
13

Oct

2022

How to confirm the zero line of the ground wire with the electric test pen

The method of measuring the zero line of the live wire with the electric pen is: hold the electric pen with the big finger and the middle finger, press the index finger on the pen
13

Oct

2022

What does the test pen show 12 36 55 mean?

The digital electric pen has the function of measuring the voltage value, which is normally divided into 12 36 55 110 220 files. If only 12 is displayed, it means that the voltage
13

Oct

2022

What is the meaning of test pen induction breakpoint test?

The inductive electric pen breakpoint test and the direct test each have a button. When measuring the voltage, press and hold the direct test button, and then touch the live wire w
13

Oct

2022

What are the requirements and matters needing attention during the electricit...

1) The operator must wear insulating gloves for high-voltage electricity inspection. 2) When conducting electricity inspection, an electroscope that has passed the test, is within
13

Oct

2022

There are several special cases when using the test pen:

1. The test pen has been verified to be good. The neon tube does not emit light when the device is tested, which does not mean that the device has no electricity. For example, when

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