Extech 382252 Earth Ground Resistance Tester Kit User Manual

1. Uvod

The Extech 382252 is a comprehensive Earth Ground Resistance Tester Kit designed for accurate measurement of earth ground resistance. This kit provides three selectable ranges for earth ground resistance: 20 Ohms (Ω), 200 Ohms (Ω), and 2000 Ohms (Ω). Beyond earth ground testing, the device also functions as a multimeter, capable of measuring AC/DC Voltage, Resistance, and Continuity. It features automatic zero adjustment for ease of use. This manual provides detailed instructions for the safe and effective operation, maintenance, and troubleshooting of your Extech 382252.

2. Sigurnosne informacije

Upozorenje: Improper use of this meter can cause damage, shock, injury, or death. Read and understand all safety information and operating instructions before using this instrument. Always adhere to local and national safety codes.

• Ne prekoračujte maksimalna ograničenja unosa za bilo koju funkciju.
• Budite izuzetno oprezni pri radu s električnim krugovima pod naponom.
• Ensure the meter is in good working condition and free from damage before use.
• Uvijek koristite ispravnu funkciju i raspon za mjerenja.
• Zamijenite baterije kada se pojavi indikator slabe baterije kako biste osigurali točna očitanja.
• Keep hands and fingers away from test probe tips when making measurements.
• Ne koristite mjerač u eksplozivnim atmosferama ili u prisutnosti zapaljivih plinova ili prašine.

3. Sadržaj paketa

Prilikom raspakiranja provjerite jesu li svi predmeti prisutni i neoštećeni:

• Extech 382252 Earth Ground Resistance Tester
• Test Leads (set)
• Auxiliary Earth Bars (2 pieces)
• Torba za nošenje
• Protective Rubber Holster
• 1.5V AA Batteries (6 pieces)

Image 1: The Extech 382252 Earth Ground Resistance Tester Kit, showing the main unit, test leads, two auxiliary earth bars, and the carrying case.

4. Značajke proizvoda

The Extech 382252 offers the following key features:

• Earth Ground Resistance measurement in three ranges: 20Ω, 200Ω, and 2000Ω.
• AC/DC Voltagmogućnosti mjerenja.
• Resistance and Continuity testing functions.
• Automatic zero adjustment for accurate readings.
• Veliki, lako čitljiv LCD zaslon.
• Funkcija zadržavanja podataka za zamrzavanje prikazanih očitanja.
• Pozadinsko osvjetljenje za vidljivost u uvjetima slabog osvjetljenja.
• Durable protective rubber holster.

Slika 2: Prednja strana view of the Extech 382252 Earth Ground Resistance Tester, highlighting its display, function dial, and control buttons.

5. Postavljanje

5.1 Ugradnja baterije

1. Provjerite je li mjerač isključen iz struje.
2. Pronađite poklopac odjeljka za baterije na stražnjoj strani mjerača.
3. Use a screwdriver to remove the screw(s) securing the cover.
4. Insert six (6) 1.5V AA batteries, observing correct polarity (+/-).
5. Vratite poklopac odjeljka za baterije i pričvrstite ga vijkom (vijcima).

5.2 Spajanje mjernih kabela

Connect the test leads to the appropriate input jacks on the meter for the desired measurement function. For earth ground resistance testing, specific connections involving the auxiliary earth bars will be detailed in the operating instructions.

6. Upute za rad

6.1 Uključivanje/isključivanje

Okrenite funkcijski kotačić iz položaja 'ISKLJUČENO' na bilo koju željenu funkciju mjerenja kako biste uključili mjerač. Za isključivanje, vratite kotačić u položaj 'ISKLJUČENO'.

6.2 Automatic Zero Adjustment

The meter features automatic zero adjustment. When selecting a resistance range, the meter will automatically adjust to zero, compensating for lead resistance. Ensure test leads are not shorted or open during this process for accurate zeroing.

6.3 Funkcija zadržavanja podataka

Press the 'HOLD' button to freeze the current reading on the display. Press it again to release the hold and resume live readings.

6.4 Funkcija pozadinskog osvjetljenja

Press the backlight button (often indicated by a light bulb icon) to illuminate the display for better visibility in dark environments. Press it again to turn off the backlight.

7. Earth Ground Resistance Measurement

The Extech 382252 uses the 3-wire (or Fall-of-Potential) method for earth ground resistance measurements. This method requires the use of the two auxiliary earth bars provided.

7.1 Measurement Procedure (3-Wire Method)

1. priprema: Ensure the circuit under test is de-energized and safely isolated.
2. Placement of Auxiliary Earth Bars:
   • Drive the first auxiliary earth bar (P) into the ground at a suitable distance from the earth electrode (E) being tested.
   • Drive the second auxiliary earth bar (C) into the ground at a further distance from P, ensuring all three points (E, P, C) are in a straight line. Typical distances are 5-10 meters (15-30 feet) between E and P, and P and C, but may vary based on soil conditions and electrode size.
3. Spajanje mjernih kabela:
   • Connect the 'E' terminal of the meter to the earth electrode under test.
   • Connect the 'P' terminal of the meter to the first auxiliary earth bar (P).
   • Connect the 'C' terminal of the meter to the second auxiliary earth bar (C).
4. Odaberite raspon: Rotate the function dial to the desired Earth Ground Resistance range (20Ω, 200Ω, or 2000Ω). Start with the highest range if the resistance value is unknown.
5. Izvršite test: Press the 'TEST' button. The meter will inject a current and measure the voltage drop to calculate the earth ground resistance.
6. Očitavanje mjerenja: The resistance value will be displayed on the LCD.
7. Provjerite točnost: For critical measurements, it is recommended to repeat the test with the auxiliary earth bars placed at slightly different distances to ensure the reading is stable and accurate.

8. Other Measurements

8.1 AC/DC Voltage Mjerenje

1. Connect the red test lead to the 'V' input jack and the black test lead to the 'COM' input jack.
2. Rotate the function dial to the desired ACV (750V AC) or DCV (1000V DC) range.
3. Spojite mjerne sonde preko strujnog kruga ili komponente koju treba mjeriti.
4. Pročitajte svtage vrijednost na zaslonu.

8.2 Mjerenje otpora

1. Provjerite je li strujni krug ili komponenta bez napona.
2. Connect the red test lead to the 'V' input jack and the black test lead to the 'COM' input jack.
3. Rotate the function dial to the desired Resistance range (e.g., 200Ω, 20kΩ, 200kΩ).
4. Spojite ispitne sonde preko komponente.
5. Očitajte vrijednost otpora na zaslonu.

8.3 Test kontinuiteta

1. Provjerite je li strujni krug ili komponenta bez napona.
2. Connect the red test lead to the 'V' input jack and the black test lead to the 'COM' input jack.
3. Rotate the function dial to the Continuity position (often indicated by a speaker icon).
4. Connect the test probes across the component or wire.
5. Zvučni signal označava kontinuitet (nizak otpor). Zaslon će prikazati vrijednost otpora.

9. Održavanje

9.1 Čišćenje

Wipe the meter with a dry, soft cloth. Do not use abrasives or solvents. Periodically clean the test leads and probes to ensure good electrical contact.

9.2 Zamjena baterije

Kada se na zaslonu pojavi indikator slabe baterije, odmah zamijenite baterije kako biste održali točnost mjerenja. Upute za umetanje baterija potražite u Odjeljku 5.1.

9.3 Skladištenje

If the meter is to be stored for an extended period, remove the batteries to prevent leakage and damage. Store the meter in its carrying case in a cool, dry environment, away from direct sunlight and extreme temperatures.

10. Rješavanje problema

• No Display/Meter Not Powering On: Check battery installation and ensure batteries are fresh. Verify the function dial is not in the 'OFF' position.
• Netočna očitanja: Ensure test leads are properly connected and not damaged. Check battery level. For earth ground resistance, verify proper placement and connection of auxiliary earth bars and ensure good contact with the ground.
• Nema zvučnog signala kontinuiteta: Check if the circuit is truly continuous. Ensure test leads are making good contact.
• Display Shows 'OL' (Overload): Izmjerena vrijednost prelazi odabrani raspon. Prebacite se na viši raspon.

Ako se problemi nastave i nakon što slijedite ove korake, obratite se korisničkoj podršci.

11. Specifikacije

12. Jamstvo

The Extech 382252 Earth Ground Resistance Tester Kit typically comes with a 1-godišnje ograničeno jamstvo from the date of purchase. This warranty covers defects in materials and workmanship under normal use. It does not cover damage resulting from misuse, accident, unauthorized repair, or modification. Please retain your proof of purchase for warranty claims.

13. Podrška

For technical assistance, calibration services, or further information regarding your Extech 382252, please refer to the official Extech website or contact their customer support department. Contact details can usually be found on the manufacturer's webweb-mjestu ili u dokumentaciji koja dolazi s vašim proizvodom.