ZC29B-1\ZC29B-2 Earth Resistance Tester, Earth Resistance Meter, Insulation Tester, Lightning Protection Testing, Lightning Protection
Model: ZC29B-1 Range: 0–10,000
Model: ZC29B-2 Range: 0–1,000
2. Operating Temperature and Humidity: Temperature (-20–40)°C; Relative Humidity ≤80%
3. Calibration Temperature and Humidity: Temperature (23±5)°C; Relative Humidity ≤75%
4. Handle Rated Speed: 150 r/min
5. Effect of Tilt: When the instrument is tilted 5° in any direction, the change in the indicated value for that variable does not exceed 50% of the accuracy. 6. Effect of External Magnetic Field: When the external magnetic field strength is 0.4 kA/m, the change in the instrument’s indicated value does not exceed 100% of the accuracy. 7. Insulation Resistance: Not less than 30 MΩ at normal temperature and humidity.
8. Insulation strength: The insulation between the circuitry and the housing can withstand a 1 kV 50 Hz sinusoidal AC voltage for 1 minute
9. Dimensions: 172 × 116 × 135 mm
10. Weight: Approx. 1.5 kg (including accessories)
Gross weight: Approx. 3.5 kg
Note: 1. Do not perform measurements during thunderstorms or when the test object is energized.
2. Before measurement, remove paint and rust from the grounding wire to reduce contact resistance at the E-E’ terminals.
3. Place the instrument on a stable surface without shaking it to ensure the meter pointer settles steadily at “0”.
4. Handle the instrument with care and avoid violent shocks.
Overview:
The ZC29B Ground Resistance Tester is suitable for measuring ground resistance in various power systems, electrical equipment, communication towers, high-rise buildings, and more. It can also measure the resistance of low-resistance conductors and the resistivity of soil.
Structural Features and Working Principle:
The instrument consists of a hand-crank generator, current transformers, a sliding-contact potentiometer, and a galvanometer. The entire assembly is housed in a plastic case, while auxiliary probes and cables are stored in a backpack, making it extremely portable.
Its working principle employs a reference voltage comparison method.
Working Principle:
When the generator handle is rotated at a speed of 150 revolutions per minute, it generates an alternating current of 105–115 Hz. The two E terminals of the tester are connected to the test object via a 5-meter lead, and the P terminal is connected to the corresponding two grounding rods. Current I flows from the generator through the R5 current probe C to ground, and from the test object and the primary winding of the current transformer CT back to the generator. The secondary winding of the current transformer induces a current (2) through the potentiometer RS; by adjusting RS, the galvanometer reading can be set to zero. Therefore, when the dial is set to 10 and the reading is N:
K = Current ratio of the CT ZC29B-2k = 1/4
Thus, RX is the measured ground resistance value ZC29B-1k = 4
Model: ZC29B-1 Range: 0–10,000
Model: ZC29B-2 Range: 0–1,000
2. Operating Temperature and Humidity: Temperature (-20–40)°C; Relative Humidity ≤80%
3. Calibration Temperature and Humidity: Temperature (23±5)°C; Relative Humidity ≤75%
4. Handle Rated Speed: 150 r/min
5. Effect of Tilt: When the instrument is tilted 5° in any direction, the change in the indicated value for that variable does not exceed 50% of the accuracy. 6. Effect of External Magnetic Field: When the external magnetic field strength is 0.4 kA/m, the change in the instrument’s indicated value does not exceed 100% of the accuracy. 7. Insulation Resistance: Not less than 30 MΩ at normal temperature and humidity.
8. Insulation strength: The insulation between the circuitry and the housing can withstand a 1 kV 50 Hz sinusoidal AC voltage for 1 minute
9. Dimensions: 172 × 116 × 135 mm
10. Weight: Approx. 1.5 kg (including accessories)
Gross weight: Approx. 3.5 kg
Note: 1. Do not perform measurements during thunderstorms or when the test object is energized.
2. Before measurement, remove paint and rust from the grounding wire to reduce contact resistance at the E-E’ terminals.
3. Place the instrument on a stable surface without shaking it to ensure the meter pointer settles steadily at “0”.
4. Handle the instrument with care and avoid violent shocks.
Overview:
The ZC29B Ground Resistance Tester is suitable for measuring ground resistance in various power systems, electrical equipment, communication towers, high-rise buildings, and more. It can also measure the resistance of low-resistance conductors and the resistivity of soil.
Structural Features and Working Principle:
The instrument consists of a hand-crank generator, current transformers, a sliding-contact potentiometer, and a galvanometer. The entire assembly is housed in a plastic case, while auxiliary probes and cables are stored in a backpack, making it extremely portable.
Its working principle employs a reference voltage comparison method.
Working Principle:
When the generator handle is rotated at a speed of 150 revolutions per minute, it generates an alternating current of 105–115 Hz. The two E terminals of the tester are connected to the test object via a 5-meter lead, and the P terminal is connected to the corresponding two grounding rods. Current I flows from the generator through the R5 current probe C to ground, and from the test object and the primary winding of the current transformer CT back to the generator. The secondary winding of the current transformer induces a current (2) through the potentiometer RS; by adjusting RS, the galvanometer reading can be set to zero. Therefore, when the dial is set to 10 and the reading is N:
K = Current ratio of the CT ZC29B-2k = 1/4
Thus, RX is the measured ground resistance value ZC29B-1k = 4
