Extech 382252 Earth Ground Resistance Tester Kit User Manual

1. المقدمة

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. معلومات السلامة

تحذير: 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.

• لا تتجاوز حدود الإدخال القصوى لأي وظيفة.
• Exercise extreme caution when working with live electrical circuits.
• Ensure the meter is in good working condition and free from damage before use.
• استخدم دائمًا الوظيفة والنطاق الصحيحين للقياسات.
• استبدل البطاريات عند ظهور مؤشر انخفاض مستوى البطارية لضمان دقة القراءات.
• 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. محتويات العبوة

تأكد من أن جميع العناصر موجودة وغير تالفة عند فك العبوة:

• Extech 382252 Earth Ground Resistance Tester
• Test Leads (set)
• Auxiliary Earth Bars (2 pieces)
• حقيبة الحمل
• Protective Rubber Holster
• بطاريات AA بجهد 1.5 فولت (6 قطع)

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. مواصفات المنتج

The Extech 382252 offers the following key features:

• Earth Ground Resistance measurement in three ranges: 20Ω, 200Ω, and 2000Ω.
• AC / DC Voltagقدرات القياس الإلكترونية.
• Resistance and Continuity testing functions.
• Automatic zero adjustment for accurate readings.
• شاشة LCD كبيرة الحجم وسهلة القراءة.
• Data Hold function to freeze displayed readings.
• Backlight for visibility in low-light conditions.
• Durable protective rubber holster.

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

5. الإعداد

5.1 تركيب البطارية

1. تأكد من إيقاف تشغيل العداد.
2. حدد موقع غطاء حجرة البطارية في الجزء الخلفي من العداد.
3. Use a screwdriver to remove the screw(s) securing the cover.
4. Insert six (6) 1.5V AA batteries, observing correct polarity (+/-).
5. أعد تركيب غطاء حجرة البطارية وثبته بالبرغي (البراغي).

5.2 توصيل أسلاك الاختبار

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. تعليمات التشغيل

6.1 تشغيل/إيقاف التشغيل

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 وظيفة الاحتفاظ بالبيانات

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 وظيفة الإضاءة الخلفية

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. تحضير: تأكد من فصل التيار الكهربائي عن الدائرة قيد الاختبار وعزلها بشكل آمن.
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. توصيل أسلاك الاختبار:
   • 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. اختر نطاقا: 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. إجراء الاختبار: Press the 'TEST' button. The meter will inject a current and measure the voltage drop to calculate the earth ground resistance.
6. قراءة القياس: ستظهر قيمة المقاومة على شاشة LCD.
7. التحقق من الدقة: 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 Voltagهـ القياس

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. قم بتوصيل مجسات الاختبار عبر الدائرة أو المكون المراد قياسه.
4. اقرأ المجلدtagقيمة البريد على الشاشة.

8.2 قياس المقاومة

1. تأكد من فصل التيار الكهربائي عن الدائرة أو المكون.
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. قم بتوصيل مجسات الاختبار عبر المكون.
5. اقرأ قيمة المقاومة على الشاشة.

8.3 اختبار الاستمرارية

1. تأكد من فصل التيار الكهربائي عن الدائرة أو المكون.
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. قم بتوصيل مجسات الاختبار عبر المكون أو السلك.
5. An audible beep indicates continuity (low resistance). The display will show the resistance value.

9. الصيانة

9.1 التنظيف

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 استبدال البطارية

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 التخزين

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. استكشاف الأخطاء وإصلاحها

• No Display/Meter Not Powering On: Check battery installation and ensure batteries are fresh. Verify the function dial is not in the 'OFF' position.
• قراءات غير دقيقة: 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.
• لا يوجد صوت تنبيه الاستمرارية: تأكد من أن الدائرة الكهربائية متصلة بالفعل. تأكد من أن أسلاك الاختبار متصلة بشكل جيد.
• تعرض الشاشة "OL" (حمل زائد): The measured value exceeds the selected range. Switch to a higher range.

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

11. المواصفات

12. الضمان

The Extech 382252 Earth Ground Resistance Tester Kit typically comes with a ضمان محدود لمدة سنة واحدة 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. الدعم

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 webيمكنك العثور على معلومات حول هذا الموضوع في الموقع أو في الوثائق المرفقة مع المنتج.