1. Įvadas ir pabaigaview
The UNI-T UT273+ is a professional clamp ground resistance tester designed for accurate measurement of earth resistance and current. It features a large black screen for clear readings, a robust jaw size, and strong anti-interference capabilities, making it suitable for various industrial and scientific applications. This manual provides detailed instructions for the safe and effective use of your UT273+ device.
1.1 pav. Baigtaview of the UNI-T UT273+ with its key features highlighted, including resistance and current measurement ranges, high-definition display, and data storage capabilities.
2. Pagrindinės savybės
- Earth Resistance Test: Measures resistance from 0 to 600Ω.
- Current Test: Measures current from 0 to 20A.
- Large Black Screen: Features a 32mm display for enhanced readability.
- Large Jaw Size: Accommodates various grounding and busbar sizes (55mm*32mm).
- Stipri apsauga nuo trukdžių: Ensures stable and accurate measurements in challenging environments.
- Signalizacijos funkcija: Settable alarm for out-of-range measurements.
- Duomenų saugykla: Stores up to 500 sets of measurement data.
- USB duomenų perdavimas: Allows for easy transfer of stored data to a computer for analysis.
- Quick Self-Check Function: Provides immediate operational status.
3. Pakuotės turinys
Atidarę pakuotę, patikrinkite, ar yra visi toliau išvardyti daiktai ir ar jie yra geros būklės:
- UNI-T UT273+ Clamp Įžeminimo varžos testeris
- Kietas nešiojimo dėklas
- USB duomenų kabelis
- Vartotojo vadovas
- Calibration Loop (Inspection Ring)
- Batteries (4x 1.5V AA, included)
Figure 3.1: The complete package contents of the UNI-T UT273+ Clamp Ground Resistance Tester.
4. Sąranka
4.1 Akumuliatoriaus įdėjimas
The UT273+ requires four 1.5V AA batteries for operation. To install or replace batteries:
- Suraskite akumuliatoriaus skyrių įrenginio gale.
- Atsuktuvu atidarykite akumuliatoriaus dangtelį.
- Įdėkite keturias 1.5 V AA baterijas, užtikrindami teisingą poliškumą (+/-).
- Saugiai uždarykite akumuliatoriaus dangtelį.
4.1 pav.: galinis view of the UT273+ indicating the battery compartment. Always ensure batteries are installed with correct polarity.
4.2 Įrenginio komponentai
Familiarize yourself with the main components of the UT273+:
Figure 4.2: Labeled diagram of the UT273+ highlighting its key components such as the clamp head, LCD display, control buttons (MODE, SET, AL, MEM), data lock/storage button, and data transmission interface.
5. Naudojimo instrukcijos
5.1 Pagrindinės operacijos
- Maitinimo įjungimas/išjungimas: Paspauskite Galia mygtuką, norėdami įjungti arba išjungti įrenginį.
- Režimo pasirinkimas: Naudokite REŽIMAS key to switch between different measurement modes (e.g., Earth Resistance, Current).
- Data Lock/Storage: Paspauskite LAIKYTI button to freeze the current reading. Press the MEM button to store the current reading.
- Signalizacijos nustatymas: Naudokite AL button to set or clear alarm thresholds.
5.2 Earth Resistance Measurement Principle
Pagrindinis kl. principasamp ground resistance meter is to measure the loop resistance. The jaw part of the clamp metras sudarytas iš ttage ritė ir srovės ritė. ttage coil provides the excitation signal, and a potential V is induced in the circuit under test. Under the action of the potential V, a current I will be generated in the circuit under test. The clamp meter measures V and I, and through the formula R=V/I, the measured resistance R can be obtained.
Figure 5.1: Illustration of the measuring principle, showing the relationship between potential (V), current (I), and resistance (R).
5.3 Matavimo metodai
5.3.1 Single-Point Grounding System (Two-Point Method)
Find an independent grounding body RB with good grounding near the tested grounding body RA (such as a nearby metal water pipe, fire hydrant, or roof lightning protection belt). Connect RA and RB with a test wire. Generally, the grounding resistance of water pipes and fire hydrants is very small and can be overlooked. If the meter reading during the 2-point test is less than the required value of the tested grounding system, both RA and RB are qualified.
5.3.2 Single-Point Grounding System (Three-Point Method)
Find 2 other existing grounding points near the grounding point to be tested or hit 2 auxiliary grounding pins to match the grounding. Into 3 grounding points. The deeper the auxiliary grounding needle, the better, generally 0.7 meters deep. The 3-point method requires a test line (Generally, a wire of 1.5-2.5 square meters is sufficient, and the insulation at both ends should be removed) and 2 auxiliary grounding pins.
Figure 5.2: Visual representation of the two-point and three-point grounding measurement methods.
5.4 Duomenų perdavimas
After the measurement is completed, plug in the standard data cable and turn on the installed host computer software. The instrument will automatically connect and communicate with the computer. Click to get the data. Data can be exported from the data stored in the meter, saving time for comparative analysis.
Figure 5.3: The UT273+ connected via USB for data transfer to a computer, illustrating the software interface for data output and saving.
6. Priežiūra
To ensure the longevity and accuracy of your UNI-T UT273+:
- Valymas: Prietaisą valykite minkštu, sausu skudurėliu. Nenaudokite abrazyvinių valiklių ar tirpiklių.
- Saugykla: Store the meter in its carrying case in a cool, dry place when not in use. Avoid extreme temperatures and humidity.
- Baterijos keitimas: Replace batteries promptly when the low battery indicator appears to prevent inaccurate readings or device malfunction. Remove batteries if the device will not be used for an extended period.
- Kalibravimas: Regular calibration by qualified personnel is recommended to maintain measurement accuracy, especially for professional applications.
7. Problemų sprendimas
This section addresses common issues you might encounter with your UT273+.
| Problema | Galima priežastis | Sprendimas |
|---|---|---|
| Įrenginys neįsijungia. | Neišsikrovusios arba neteisingai įdėtos baterijos. | Patikrinkite baterijų poliškumą arba pakeiskite jas naujomis. |
| Netikslūs rodmenys. | Low battery, environmental interference, or improper measurement technique. | Replace batteries. Ensure proper grounding and minimize external interference. Refer to measurement method section. Consider professional calibration. |
| Data transfer failure. | Loose USB connection, software not running, or driver issues. | Ensure USB cable is securely connected. Verify host computer software is open and running. Install necessary drivers if prompted. |
| Ekrane rodoma „OL“ (perkrova). | Measurement exceeds the device's range. | Ensure the measurement is within the specified range of the UT273+. |
8. Specifikacijos
The following table outlines the technical specifications for the UNI-T UT273+ Clamp Ground Resistance Tester:
Figure 8.1: Detailed specifications for the UT273+ and other related models, including measurement ranges, accuracy, and general features.
- Gaminio matmenys: 6.5 x 4.33 x 4.72 colio (16.5 x 11 x 12 cm)
- Prekės svoris: 1.32 svaro (0.6 kilogramo)
- Maitinimo šaltinis: Battery Powered (4x 1.5V AA batteries)
- Spalva: Įvairiaspalvis
- Gamintojas: UNI-Trend
- Pirmoji prieinama data: 6 m. rugpjūčio 2023 d
9. Garantija ir palaikymas
UNI-T (Uni-Trend Technology) has been a developer, manufacturer, and marketer of reliable testing, measuring, and inspecting products since 1988. For specific warranty information, technical support, or service inquiries, please contact UNI-T directly through their official channels.
Oficialus Websvetainė: http://www.uni-trend.com.cn
Please refer to the product packaging or the official UNI-T website for the most up-to-date contact information and warranty terms applicable to your region.