1. Uvod i krajview
The UNI-T UT520 Series Digital Earth Testers are designed for precise 3-wire and simple 2-wire earth resistance measurements. These instruments are essential for evaluating power and electrical systems, lightning protection equipment, and the ground systems of various electrical installations. The UT521 model offers high economic value and a lightweight design, making it convenient for field work.
2. Značajke proizvoda
The UT520 series earth resistance testers are equipped with a range of features to ensure accurate and convenient measurements:
- Ručni raspon: Allows for precise selection of measurement ranges.
- Indikacija slabe baterije: Obavještava korisnika kada je baterija niska.
- Zadržavanje podataka: Zamrzava prikazano mjerenje radi lakšeg očitavanja.
- LCD pozadinsko osvetljenje: Provides illumination for clear readings in low-light conditions.
- Automatsko isključivanje: Conserves battery life by automatically shutting down after approximately 10 minutes of inactivity.
- Prikaz svih ikona: Intuitive icons on the LCD for easy understanding of modes and status.
- Double Insulation Protection: Enhances user safety during operation.
- Poor Contact Display: Indicates poor contact with the electrodes using “…Ω”.
- Prikaz prekoračenja dometa: Shows “OL” when the measured value exceeds the selected range.
- Simple 2-wire Testing: For basic earth resistance measurements.
- Precise 3-wire Testing: For more accurate earth resistance measurements.
3. Components and Panel Introduction
Familiarize yourself with the main components and controls of the UT521 Digital Earth Tester:
- Input Terminals (V, E, P, C): Connect test leads for various measurements.
- LCD ekran: Prikazuje očitanja mjerenja, status baterije i druge indikatore.
- LIGHT/LOAD Button: Activates the display backlight or initiates a load test.
- Dugme ZADRŽI/SAČUVAJ: Zamrzava trenutno očitavanje ili sprema podatke.
- TEST dugme: Initiates the measurement process.
- Okretni prekidač: Selects the desired measurement function (OFF, 2000Ω, 200Ω, 20Ω, EARTH VOLTAGE, OFF).
4. Podešavanje
Before operating the UT521, ensure proper setup:
- Instalacija baterije: The UT521 requires 6 x 1.5V LR6 (AA) batteries. Open the battery compartment on the back of the device and insert the batteries, observing correct polarity.
- Provjera dodatne opreme: Verify that all standard accessories are present, including batteries, simple test leads with alligator clips, standard test leads with alligator clips, earth spike, and gallus.
- Prvi pregled: Visually inspect the device and test leads for any signs of damage. Do not use the device if it appears damaged.
5. Uputstvo za upotrebu
This section details the procedures for performing earth resistance and AC earth voltage mjerenja.
5.1 Mjerenje otpora uzemljenja (3-žična metoda)
The 3-wire method provides a more precise measurement of earth resistance. This method requires the use of two auxiliary earth stakes.
- Insert the two auxiliary earth stakes (P and C) into the ground at appropriate distances (typically 5-10m from the earthing electrode under test).
- Connect the test leads from the UT521 to the earthing electrode (E), and the auxiliary stakes (P and C) as shown in Figure 5.1.
- Turn the rotary switch to the desired earth resistance range (20Ω, 200Ω, or 2000Ω).
- Press the TEST button to initiate the measurement. The reading will be displayed on the LCD.
Watch the video below for a demonstration of 3-wire earth resistance testing:
5.2 Mjerenje otpora uzemljenja (2-žična metoda)
The 2-wire method is a simpler approach, often used when auxiliary stakes cannot be driven into the ground. It requires a known reference earthing electrode.
- Connect the test leads from the UT521 to the earthing electrode under test (Rx) and a known reference earthing electrode (re) as shown in Figure 5.2.
- Turn the rotary switch to the desired earth resistance range (20Ω, 200Ω, or 2000Ω).
- Press the TEST button to initiate the measurement. The reading will be displayed on the LCD.
5.3 AC Uzemljenje Voltage Measurement
To measure the AC earth voltage, slijedite ove korake:
- Connect the test leads to the appropriate terminals for voltage measurement (V and E+).
- Turn the rotary switch to the “EARTH VOLTAGE” pozicija.
- The AC earth voltage će biti prikazano na LCD-u.
Watch the video below for a demonstration of AC earth voltage testing:
6. Specifikacije
The following table provides detailed specifications for the UT521 and UT522 models:
| Kategorija | Specifikacija |
|---|---|
| Broj modela | HY-UT521 |
| Earth Resistance Range | 0-20Ω, 0-200Ω, 0-2000Ω |
| AC Earth Voltage domet | 0-200V |
| Frekvencija | 50Hz/60Hz |
| Prikaz broja | 2000 |
| Automatsko isključivanje | Oko 10 minuta |
| Skladištenje podataka | 20 seta |
| Izvor napajanja | 6 x 1.5V Battery (LR6) |
| Dimenzije prikaza | 70.6mm x 34mm |
| Boja proizvoda | Crvena i siva |
| Neto težina | 0.6 kilograma (560 g) |
| Dimenzije proizvoda | 160 mm x 100 mm x 70.5 mm (6.5 x 4.33 x 4.72 inča) |
| Prvi raspoloživi datum | 6. avgusta 2023 |
| Proizvođač | UNI-Trend |
| Zemlja porijekla | Kina |
7. Održavanje
To ensure the longevity and accuracy of your UNI-T UT521 Digital Earth Tester, follow these maintenance guidelines:
- čišćenje: Obrišite uređaj mekom, suhom krpom. Ne koristite abrazivna sredstva za čišćenje ili rastvarače.
- Zamjena baterije: Replace batteries promptly when the low battery indicator appears. Ensure to use 6 x 1.5V LR6 (AA) batteries. Remove batteries if the device will not be used for an extended period to prevent leakage.
- Skladištenje: Store the tester in a cool, dry place, away from direct sunlight and extreme temperatures. Use the provided carrying bag for protection.
- Test kablovi: Regularly inspect test leads for any cuts, cracks, or damage. Replace damaged leads immediately to ensure safety and accurate measurements.
8. Otkrivanje problema
Ako naiđete na probleme s vašim UT521, pogledajte sljedeće uobičajene probleme i rješenja:
| Problem | Mogući uzrok | Rješenje |
|---|---|---|
| Displej prikazuje “OL” | Over-range measurement | Select a higher measurement range using the rotary switch. |
| Display shows “…Ω” | Loš kontakt s elektrodama ili mjernim kablovima | Ensure all connections are secure and the earth stakes are firmly inserted into the ground. Clean the contact points if necessary. |
| Nema prikaza ili je prikaz slab | Low battery or no batteries installed | Replace the batteries with new 1.5V LR6 (AA) batteries. Check battery polarity. |
| Netačna očitavanja | Incorrect measurement method, faulty test leads, or environmental factors | Verify the correct 2-wire or 3-wire setup. Inspect test leads for damage. Ensure proper environmental conditions for testing. |
9. Šta se nalazi u kutiji
The UNI-T UT521 Digital Earth Tester package typically includes the following items:
- UNI-T UT521 Digital Earth Tester Unit
- Batteries (1.5V LR6 x 6)
- Jednostavni mjerni kablovi s krokodil štipaljkama
- Standardni mjerni kablovi s krokodil štipaljkama
- Earth Spikes
- Gallus (remen za rame)
- Torba za nošenje
- English User Manual
10. Sigurnosne informacije
Always adhere to safety precautions when operating the UNI-T UT521 Digital Earth Tester to prevent electric shock and damage to the instrument.
- Opća sigurnost: Read and understand the operating manual before use.
- Opasnost od strujnog udara: To avoid electric shock, remove test leads before opening the case.
- Kategorija mjerenja: This device is rated for IEC 61010-1 CAT III 600V.
- inspekcija: Do not use the device if it or its test leads appear damaged.
- Okruženje: Do not operate in wet environments or in the presence of explosive gases or vapors.
11. Garancija i podrška
For warranty information, technical support, or service inquiries, please contact UNI-T customer service. Refer to the contact details provided in your product packaging or on the official UNI-T website. You may also find support information via the customer service hotline: 400-876-7822.
