Test pen, lamp inspection judgment

1. Correct holding method when using low-voltage measuring pen

Commonly used low - voltage measuring pen, master the test two - grip method.Pen type measuring pen, the palm touch pressure metal clip.Hold the pencil in the middle between your index and middle fingers.

Screwdriver type measuring pen, index finger press tail metal cap.The middle finger and ring finger of the thumb, pinch the middle of the plastic rod.Neon tubes have small Windows that are backlit and view toward themselves.

2. The use of low-voltage test pen should know what should be met

When using a low voltage measuring pen, you should know that there should be eight.With a ballpoint pen measuring pen, holding the rod metal hoop.Fine inspection pen assembly, resistance must be behind the neon tube.

Test resistance value must be greater than 1 megohm at regular intervals.The measuring pen of screwdriver type is covered with insulation pipe.Before use, there is electricity to predict, check whether the performance is good.

The test operation should be accurate and be careful that the nib touches the double line.The insulation cushion table should be checked for electricity, and the human body part should be grounded.Neon glow is not clear when tested in bright light.

3. Test pen to test the AC circuit in any two wires are out of phase or phase

Hold an electric pen in each hand. Keep your feet insulated from the ground. Touch one line with each pen.

4. Measuring pen difference alternating current and direct current

Electric pen test dc, AC bright DC dark.Ac neon is bright all over, dc neon is bright on one side.

5. Measuring pen difference dc positive and negative electrode

Determine the positive and negative terminals of DIRECT current.The bright front is negative, and the bright back is positive.

6. Test pen test dc system positive and negative grounding

Dc system of substation, the pen does not shine when touched.If bright near the tip of the pen, the positive pole has ground fault.If the light is near the hand end, the ground fault is at the negative pole.

7. Judge single-phase earth fault of 380/220V three-phase three-wire power supply line

Three phase wire connected by star, two bright pens touched, the remaining one weak brightness, the phase wire soft ground.If almost no light, gold attribute ground fault.

8. Judge the three-phase resistance furnace connected with star to break phase fault

Three - phase electric furnace neutral point, load balance no electrification.The pen touched the neon tube bright, and judged the fault to be a broken phase.

9. Judge the neutral line of the lamp circuit is broken

Lighting circuit switch closed, the lamp does not light the pen test.The neutral lines of the phase line are all bright and the neutral line of the power supply is broken.

10. Test the quality and polarity of hV silicon reactor

The pen string diode, the positive pole is connected to the mains phase line.Hold either end of the stack and touch the metal clamp of the piezoelectric pen.Neon inside the pen if bright, holding silicon pile negative extreme.

The neon tube inside the pen does not shine, holding the silicon heap is extreme.Hold silicon reactor end switch, positive and negative measurement to observe.Both neon tubes shine, short circuit in high - pressure silicon stack.

Both neon tubes are not bright and open inside the high pressure silicon stack.

11. Use digital display induction pen correctly

Digital display induction test pen, correct grip test method.The index finger presses the tip of the pen tail, the middle finger and the ring finger of the thumb, pinch the middle and upper part of the plastic rod, and press the electrode with both the thumb.

The digital display is backlit and viewed towards itself.Touch the bare conductor by pressing the thumb directly.Test at the induction break point and touch the sheath conductor.

Distinguish neutral line of phase line and find the broken core point of phase line.

12. Inspection lamp calibration lighting installation engineering

After the completion of a lighting project, the lamp is usually checked.Disconnect all lamp switches and pull out the phase line melt tube.Fuse upper and lower pile head, span high-power test lamp.

Power on the main switch, check the lamp series circuit.If the light is not on, there must be a short circuit.Troubleshoot and verify until there is no short circuit in the line.

Check each lamp of the branch, close the lamp switch respectively.Branch short circuit test light on, broken line failure light does not light.The lamp emits a dim light, and the lamp is normal when it is lit.

Turn off the lamp and check the second lamp.

13. Check lamp check single-phase socket

Single-phase 222 sockets, usually divided into two holes and three holes.The two holes are in the left, middle and right phases, and the left, middle and right phases are in the ground.

Single - phase 220 socket, jumper check lamp calibration.The left, right and center are connected to check the light, the light is normal is correct.The fault light is not on, and the contact light is flashing.

Three hole socket add test, right phase upper ground light also light, left middle upper ground light does not light, otherwise the wiring is incorrect.

14. Single-phase watt-hour meter is checked by hW inspection lamp

Test and calibrate the single-phase watt-hour meter and go around the 100-watt bulb.Constant removal thirty-six thousand, theoretical units of time per second.

The measured theoretical time difference has a good error of 2%.More facts, less reasoning, less words, more words.

15. Check the wiring of three-phase four-wire electricity meter by bulb nuclear phase method

Three - phase four - wire watt-hour meter, connection check nuclear phase method.Two test lamps in series, two leads across contact: voltage terminal of a component, the phase current power line.

The light shows the wrong connection line, different voltage and current phase.The lamp is not on, and the voltage and current are in phase.

16. Inspection lamp detects that phase line and neutral line of single-phase electricity meter are reversed

Domestic single - phase watt-hour meter, one - in - one - out wiring.Check the lamp two outgoing line, a line first ground, the other end to touch the table terminal, the right incoming line and outgoing line.

Wiring is correct the lamp does not turn on, the lamp appears zero line upside down.

17. Test the lamp to detect the quality of the daylight lamp

Sunlight lamp tube stand or fall, inspection lamp inspection judgment.The lamp is connected to 222 power supply by the end of the lamp.The lamp light and glow, the measured lamp end is good.

Lamp tube without glow tube end, filament electron consumption.Repeatedly touch such as not bright, pipe end filament has been broken.

18. Check the lamp check the ballast of fluorescent lamp

Fluorescent lamp is abnormal, check the ballast.Ballast series test lamp, span 222 power supply.The lights are dim red orange and the ballast is trouble-free.

Bright near normal short circuit, no bright break or off welding.

19. Test lamp test and judge that the winding of power transformer has inter-turn short circuit

Power transformer winding, turn short circuit is difficult to determine.Secondary winding break load, primary winding series test lamp.Span 222 power supply, turn between the short street light is brighter.

Filament slightly red does not shine, winding normal no short circuit.

20. Check the lamp to check the insulation of the low-voltage motor

Low voltage motor insulation, inspection lamp rough test.Control motor contactor, check lamp cross contact up and down side.The bulb doesn't work at all, and the motor is well insulated.

Filament slightly red light damage, brightness normal serious damage.

21. Test lamp detects low-voltage three-phase motor running when power supply is out of phase

When the motor is in phase break, the inspection lamp is detected phase by phase.Switch on the power contactor or fuse upper and lower sides.Test lamp cross contact lamp does not light, the measured power phase is normal.

Red filament hair dark light, contact hair fuse broken.

22. Check the lamp to monitor the resistance wire breakdown of the enclosed three-phase electric heater

Closed three-phase electric heater, resistance wire breakage monitoring.Star connection method neutral point, grounding wire indirect lamp inspection.The three-phase resistance wire is normal and the test lamp does not work at all.

The filament is red and dim and bright, and the resistance wire of one phase burns off.Bulb brightness up to normal, two - phase resistance wire burn off.

23. Check the lamp to distinguish static electricity and leakage electricity

The outer cover of the equipment is measured by a pen. The neon tube shines with voltage.Between the electrified parts of the earth, jumper check the lamp to judge.If the lamp is not on, it is static electricity. If the lamp is on, it is leakage electricity.

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