How to use the resistance tester and the calibration procedure
How to use the resistance tester and the calibration procedure
The resistance tester is an indispensable electronic equipment tool for electrical safety inspection and grounding engineering completion acceptance. Including grounding resistance tester, insulation resistance tester, grounding resistance tester, DC resistance measuring instrument, surface resistance tester and loop resistance tester.
Scope of application
It is used to test DC resistance of transformers, motors, transformers and other equipment (test speed is fast, test results are printed intuitively).
Instructions
The grounding resistance tester refers to the earthing body resistance and the soil stray resistance buried in the ground. It is usually measured by a grounding resistance measuring instrument (or grounding resistance meter). The shape measuring instrument has the same shape as the ordinary insulated rocking watch, and is also called a grounding resistance shaking table according to custom. The shape of the shaker varies slightly depending on the model, but the method of use is basically the same. The type grounding resistance measuring instrument is provided with two grounding probes and three wires. The method of use and measurement steps are as follows:
(a) Grounding resistance tester (b) connecting wire (c) measuring grounding bar
1. Disconnect the connection point between the grounding trunk and the grounding body, or disconnect the connecting points of all grounding branches on the grounding trunk.
2. Insert the two grounding rods into the ground 400mm deep, one far from the grounding body 40m, and the other 20m away from the grounding body.
3. Place the shaker in a flat place near the grounding body and wire it.
(1) Connect the terminal block E on the watch and the grounding body E' of the grounding device with a connecting wire.
(2) Connect the terminal block C on the watch to the grounding rod C' which is 40m away from the grounding body with a connecting wire.
(3) Connect the terminal block P on the watch and the ground bar P' 20m away from the grounding body with a connecting wire.
4. Adjust the coarse adjustment knob according to the grounding resistance requirement of the grounding body to be tested (there are three adjustable ranges on the top).
5. Shake the watch evenly at a speed of about 120 rpm. When the hands are deflected, the fine adjustment dial is adjusted until the hands are centered. After adjusting the reading of the fine dial, multiply by the coarse adjustment multiple, which is the grounding resistance of the grounded body to be tested. For example, if the fine-tuning reading is 0.6 and the coarse tuning resistance is 10, the measured grounding resistance is 6Ω.
6. In order to ensure the reliability of the measured grounding resistance value, the orientation should be changed and the retesting should be performed. Take the average of several measured values ​​as the grounding resistance of the grounding body.
Operation Manual
Before measuring, first ensure that the surface to be tested is clean and free from contamination.
Surface impedance
1, Parallel Probe Resistivity Method (Parallel Probe ResistivityMethod)
The parallel probe impedance measurement method is a measurement method conforming to the EOS/ESD-S11.11-1993 standard, which is a rapid method for measuring the resistance value of a planar uniform material. This method is also suitable for the measurement of multilayer materials, but the temperature and humidity conditions at the time of measurement must be indicated in the impedance value report. A. Place the watch on the surface of the object to be measured.
B. Adjust the switch to the desired voltage position (10 volts or 100 volts)
C. Press and hold the measurement button with a pressure of approximately 5 lbs. The LCD screen will display the measured surface impedance, temperature and relative humidity values. The entire measurement process is approximately fifteen seconds.
·The surface impedance unit is ohm / □
·The temperature unit is the camera
· Relative humidity unit is a percentage
In each measurement, after pressing the measurement button, the tester will continuously display the trim measurement value. Within about forty-five seconds after the button is released, the last measurement value is displayed.
2, Concentric Ring Probe Resistivity method (concentric ring probe is optional)
Plug the cable plug into the two 3.5 mm jacks on the meter and connect the banana plug to the concentric ring probe (optional). After placing the probe on the surface of the object to be tested, press the button for about 15 seconds, the correct temperature and relative humidity will be displayed on the LCD. The correct surface impedance value is multiplied by 10 on the LCD. The unit is ohm / â–¡. E.g:
Is displayed on the LCD screen of 3.5 × 10 4 ohm / □; actual impedance value of 3.5 × 10 5 ohm / □
Calibration step
1. Range 10 3 to 10 12 Impedance bridge with 1% accuracy. High-precision relative humidity meter (Relative Humidity Hygrometer) High accuracy Thermometer
2. Open the cover and be careful not to damage the two wires connecting the power switch on the board.
3. Find the three calibration regulators at the bottom right of the board (Calibration Pots)
4. Make the watch at least 1/2 hour under this environmental condition, and then start self-balancing before starting the test.
5. Connect one end of the connecting cable of the tester to the alligator clip and the other end to the banana plug.
6. Insert the 3.5 mm long plug into the socket of the meter.
7. Connect the ends of the resistor with an alligator clip.
8. Three calibration regulators, the uppermost is the "humidity" measurement, the middle is the "impedance", and the bottom is the "temperature adjustment with a small screwdriver." The clockwise direction is the increase value adjustment, and the counterclockwise direction is the decrease value adjustment.
9. Press the power switch and compare the "temperature", "humidity" and "resistance" values.
10. Release the power switch and slowly adjust the corresponding calibration regulator.
11. Press the power switch again to observe the LCD display.
12. If you need to recalibrate, press the power switch and adjust the corrector.
13. Cover the cover and tighten the four fixing screws.
14. Press the power switch to determine if the meter is working properly.
Resistance tester usage
1) Read the operating instructions of the grounding resistance measuring instrument, and fully understand the structure, performance and usage of the instrument.
2) Prepare the necessary tools and all instrument accessories for the measurement, and wipe the instrument and grounding probe cleanly. Especially for the grounding probe, be sure to clean the dirt and rust stains whose surface affects the conductivity.
Selection of grounding resistance tester
Why is the grounding resistance still a problem that everyone has neglected? The main reason is that it is not suitable for the ideal measuring instrument. Because of the well-known reasons, the grounding table is very poor in accuracy. Sometimes the same connecting resistor becomes an abstract physical quantity, so that People are hard to find. With the development of scientific instruments, the advanced grounding resistance tester completely controls the essentials of the ground resistance test, and the test value can be correct. The intelligent grounding resistance meter is powerful but can cope with various complicated situations in the field, such as effectively eliminating interference, automatically tracking the most suitable test strips, and presenting various problems, such as intelligent prompts, etc. Some ground resistance meters can also Direct measurement of interference frequency, interference voltage, automatic zero calibration and other characteristics. If you need to test the accuracy a little higher, and it is convenient and easy, you can use the double-clamp grounding resistance tester, such as the output grounding tower, microwave tower, lightning rod and other grounding device grounding resistance measurement and good grounding conditions auxiliary device (faucet, In the case of a water pipe device, the grounding resistance can be measured using this double-clamp grounding resistance meter. For large-scale system grounding, network grounding, and soil resistivity testing, it is better to choose a grounding resistance meter. The three-wire and four-wire measuring methods are used. Due to the unique function of the instrument, the repeatability and stability of the measured value of the ground resistance are ensured. The grounding resistance measurement accuracy is up to 3%, and its test current is <3A
The company's main stainless steel water collector, tank bottom weld vacuum test box, reading instrument, eight-stage air microbial sampler, relay comprehensive tester, dual-wavelength scanner, coating thickness gauge, soil mill, tempered glass surface Flatness tester, sound sensor, portable electric water level gauge, network mouth flow meter, corrosion rate meter, portable scratch tester, freezing point tester, water quality tester, online ammonia tester, coating thickness gauge, coating Thickness gauge, soil pulverizer, digital thermometer, gas sampling pump, ceramic impact tester, automatic crystallization point tester, drug freezing point tester, reed switch tester, constant temperature water bath, gasoline root turn, gas Sampling pump, tempered glass tester, water quality tester, PM2.5 tester, inhalable particulate matter detector, high frequency heat sealing machine, strain control triaxial instrument, milk somatic cell detector, helium gas concentration detector, soil moisture conductance Rate tester, field strength meter, collection box, color ratio tester, capillary water absorption time measuring instrument, redox potentiometer vibrometer, carbon monoxide carbon dioxide detection , CO2 analyzer, oscillopolarograph, slime content tester, car starter power supply, automatic potentiometric titrator, portable thermometer, zirconia analyzer, reed switch tester, precision conductivity meter, TOC water quality analysis Instrument, microcomputer plasticity tester, wind direction station, automatic spotting instrument, soil oxidation reduction potentiometer, digital thermometer, portable total phosphorus tester, corrosion rate meter, constant temperature water bath, residual chlorine detector, free expansion rate meter , centrifuge cup, concrete saturated vapor pressure device, particle strength tester, Gauss meter, automatic film coating machine, safety valve grinding tool, weather station, kinesthetic orientation instrument, dark adaptation instrument, smell collector, rain gauge, four in one Gas analyzer, emulsion concentration meter, dissolved oxygen meter, temperature measuring instrument, thin layer planking device, temperature recorder, aging meter, noise detector, constant temperature and humidity chamber, split resistivity tester, initial viscosity and holding viscosity Tester, infrared carbon dioxide analyzer, hydrogen lamp, kinesthetic orientation instrument, constant temperature animal operating table, cooling fan, grease acid value detector, viscosity meter, colony counter, Weather station, rain gauge, Kjeldahl nitrogen analyzer, fluorescent whitening agent, the company adhering to the "customer first, forge ahead" business philosophy, adhere to the "customer first" principle to provide our clients with quality services. Welcome patrons!
Pets Products,Pet Supplies,Dog Supplies,Cat Supplies,Pet Store Supplies,Pet Shop Products
Ningbo Yinzhou Hengxi Winbate Household Product Manufacturer , https://www.winbate.com