Extech 382252 Earth Ground Resistance Tester Kit User Manual

1. Introduktion

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. Sikkerhedsoplysninger

Advarsel: 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.

• Overskrid ikke de maksimale inputgrænser for nogen funktion.
• Udvis ekstrem forsigtighed, når du arbejder med strømførende elektriske kredsløb.
• Ensure the meter is in good working condition and free from damage before use.
• Brug altid den korrekte funktion og det korrekte område til målinger.
• Udskift batterierne, når indikatoren for lavt batteri vises, for at sikre nøjagtige aflæsninger.
• Keep hands and fingers away from test probe tips when making measurements.
• Brug ikke måleren i eksplosive atmosfærer eller i nærheden af ​​brandfarlige gasser eller støv.

3. Pakkens indhold

Kontroller, at alle genstande er til stede og ubeskadigede ved udpakning:

• Extech 382252 Earth Ground Resistance Tester
• Test Leads (set)
• Auxiliary Earth Bars (2 pieces)
• Bæretaske
• Protective Rubber Holster
• 1.5V AA-batterier (6 stk.)

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. Produktfunktioner

The Extech 382252 offers the following key features:

• Earth Ground Resistance measurement in three ranges: 20Ω, 200Ω, and 2000Ω.
• AC/DC Voltage measurement capabilities.
• Resistance and Continuity testing functions.
• Automatic zero adjustment for accurate readings.
• Stort, letlæseligt LCD-display.
• Data Hold function to freeze displayed readings.
• Baggrundsbelysning for synlighed under svagt lys.
• Durable protective rubber holster.

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

5. Opsætning

5.1 Batteriinstallation

1. Sørg for, at måleren er slukket.
2. Find batteridækslet på bagsiden af ​​måleren.
3. Use a screwdriver to remove the screw(s) securing the cover.
4. Insert six (6) 1.5V AA batteries, observing correct polarity (+/-).
5. Sæt dækslet til batterirummet på igen, og fastgør det med skruen/skruerne.

5.2 Tilslutning af testledninger

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. Betjeningsvejledning

6.1 Tænd/sluk

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 Dataholdefunktion

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 Baggrundsbelysningsfunktion

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. Forberedelse: Sørg for, at det kredsløb, der testes, er spændingsløst og sikkert isoleret.
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. Tilslutning af testledninger:
   • 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. Vælg område: 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. Udfør testen: Press the 'TEST' button. The meter will inject a current and measure the voltage drop to calculate the earth ground resistance.
6. Læs måling: Modstandsværdien vil blive vist på LCD-skærmen.
7. Bekræft nøjagtighed: 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. Andre målinger

8.1 AC/DC Voltage Måling

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. Tilslut testproberne på tværs af det kredsløb eller den komponent, der skal måles.
4. Læs bindtage -værdi på displayet.

8.2 Modstandsmåling

1. Sørg for, at kredsløbet eller komponenten er spændingsløs.
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. Tilslut testproberne på tværs af komponenten.
5. Læs modstandsværdien på displayet.

8.3 Kontinuitetstest

1. Sørg for, at kredsløbet eller komponenten er spændingsløs.
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. Tilslut testproberne på tværs af komponenten eller ledningen.
5. En biplyd indikerer kontinuitet (lav modstand). Displayet viser modstandsværdien.

9. Vedligeholdelse

9.1 Rengøring

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 Udskiftning af batteri

Når indikatoren for lavt batteri vises på displayet, skal batterierne straks udskiftes for at opretholde målenøjagtigheden. Se afsnit 5.1 for instruktioner om batteriinstallation.

9.3 Opbevaring

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. Fejlfinding

• Intet display/måler tænder ikke: Check battery installation and ensure batteries are fresh. Verify the function dial is not in the 'OFF' position.
• Upræcise læsninger: 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.
• Ingen biplyd ved kontinuitet: Check if the circuit is truly continuous. Ensure test leads are making good contact.
• Display Shows 'OL' (Overload): The measured value exceeds the selected range. Switch to a higher range.

Hvis problemerne fortsætter efter at have fulgt disse trin, skal du kontakte kundesupport.

11. Specifikationer

12. Garanti

The Extech 382252 Earth Ground Resistance Tester Kit typically comes with a 1 års begrænset garanti 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. Support

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 webwebstedet eller i den dokumentation, der følger med dit produkt.