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. Varnostne informacije

Opozorilo: 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 prekoračite največjih vhodnih omejitev za nobeno funkcijo.
• Pri delu z električnimi tokokrogi pod napetostjo bodite izjemno previdni.
• Ensure the meter is in good working condition and free from damage before use.
• Always use the correct function and range for measurements.
• Za zagotovitev natančnih odčitkov zamenjajte baterije, ko se prikaže indikator nizke temperature baterije.
• Keep hands and fingers away from test probe tips when making measurements.
• Do not operate the meter in explosive atmospheres or in the presence of flammable gases or dust.

3. Vsebina paketa

Po razpakiranju preverite, ali so vsi predmeti prisotni in nepoškodovani:

• Extech 382252 Earth Ground Resistance Tester
• Test Leads (set)
• Auxiliary Earth Bars (2 pieces)
• Torbica za prenašanje
• 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. Značilnosti izdelka

The Extech 382252 offers the following key features:

• Earth Ground Resistance measurement in three ranges: 20Ω, 200Ω, and 2000Ω.
• AC/DC Voltagzmogljivosti merjenja.
• Resistance and Continuity testing functions.
• Automatic zero adjustment for accurate readings.
• Velik, lahko berljiv LCD zaslon.
• Data Hold function to freeze displayed readings.
• Backlight for visibility in low-light conditions.
• Durable protective rubber holster.

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

5. Nastavitev

5.1 Namestitev baterije

1. Prepričajte se, da je merilnik izklopljen.
2. Poiščite pokrov predalčka za baterije na zadnji strani merilnika.
3. Use a screwdriver to remove the screw(s) securing the cover.
4. Insert six (6) 1.5V AA batteries, observing correct polarity (+/-).
5. Namestite pokrov predalčka za baterije in ga pritrdite z vijakom(-i).

5.2 Priključitev merilnih vodnikov

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. Navodila za uporabo

6.1 Vklop/izklop

Rotate the function dial from the 'OFF' position to any desired measurement function to power on the meter. To power off, rotate the dial back to the 'OFF' position.

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 zadrževanja podatkov

Pritisnite gumb »HOLD«, da zamrznete trenutno odčitavanje na zaslonu. Ponovno ga pritisnite, da sprostite zadržanje in nadaljujete z odčitavanjem v živo.

6.4 Funkcija osvetlitve ozadja

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. Priprava: 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. Priključitev merilnih vodnikov:
   • 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. Izberite obseg: 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. Perform Test: Press the 'TEST' button. The meter will inject a current and measure the voltage drop to calculate the earth ground resistance.
6. Preberite meritev: Vrednost upora bo prikazana na LCD-prikazovalniku.
7. Preverite natančnost: 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 Merjenje

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. Merilne sonde priključite na vezje ali komponento, ki jo želite izmeriti.
4. Preberite zvtage vrednost na zaslonu.

8.2 Merjenje upora

1. Prepričajte se, da je tokokrog ali komponenta brez napetosti.
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. Merilne sonde priključite na komponento.
5. Na zaslonu preberite vrednost upora.

8.3 Preizkus kontinuitete

1. Prepričajte se, da je tokokrog ali komponenta brez napetosti.
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. Merilne sonde priključite na komponento ali žico.
5. Zvočni pisk označuje prevodnost (nizek upor). Na zaslonu se bo prikazala vrednost upora.

9. Vzdrževanje

9.1 Čiščenje

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 Zamenjava baterije

When the low battery indicator appears on the display, replace the batteries promptly to maintain measurement accuracy. Refer to Section 5.1 for battery installation instructions.

9.3 Shranjevanje

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. Odpravljanje težav

• No Display/Meter Not Powering On: Check battery installation and ensure batteries are fresh. Verify the function dial is not in the 'OFF' position.
• Netočni odčitki: 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.
• Brez piska za neprekinjeno delovanje: Check if the circuit is truly continuous. Ensure test leads are making good contact.
• Display Shows 'OL' (Overload): Izmerjena vrednost presega izbrano območje. Preklopite na višje območje.

If issues persist after following these steps, contact customer support.

11. Specifikacije

12. Garancija

The Extech 382252 Earth Ground Resistance Tester Kit typically comes with a 1-letna omejena garancija 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. Podpora

For technical assistance, calibration services, or further information regarding your Extech 382252, please refer to the official Extech webspletno mesto ali se obrnite na njihov oddelek za podporo strankam. Kontaktne podatke običajno najdete na proizvajalčevem webspletnem mestu ali v dokumentaciji, ki je priložena vašemu izdelku.