Digital megohmmeter HZ-3251

portablehigh-voltagebattery-powered

Product Overview
An insulation resistance tester, often referred to as a megohmmeter or simply a "megger," is a specialized instrument used to measure the resistance offered by electrical insulation materials. The primary purpose of this device is to assess the quality and effectiveness of insulation in electrical equipment, cables, transformers, motors, and other electrical components.

Technical (summary table)
Insulation resistance measurement test voltage: 10kV
Resistance ranges (examples extracted from table): 0 ~ 9.99kΩ; 10.0 ~ 99.9kΩ; 100 ~ 999kΩ; 1.00 ~ 9.99MΩ; 10.0 ~ 99.9MΩ; 100 ~ 999MΩ; 1.00 ~ 9.99GΩ; 10.0 ~ 99.9GΩ; 100 ~ 999GΩ; 1.00 ~ 9.99TΩ; 10.0 ~ 99.9TΩ; 100 ~ ~999TΩ; full-scale top indicated up to ~20TΩ
Resolution examples: 0.01kΩ, 0.1kΩ, 1kΩ, 10kΩ, 100kΩ, 1MΩ, 10MΩ, 100MΩ, 1GΩ, 10GΩ, 100GΩ etc.
Accuracy / precision mapping (examples): for some ranges ±5% full scale; for other (higher) ranges ±20% indicated in table cells

Test voltages / corresponding full-scale resistance values (from table)
100V → Full scale ≈ 200 GΩ
250V → Full scale ≈ 500 GΩ
500V → Full scale ≈ 1.00 TΩ
1000V → Full scale ≈ 2.00 TΩ
2500V → Full scale ≈ 5.00 TΩ
5000V → Full scale ≈ 10.0 TΩ
10000V → Full scale ≈ 20.0 TΩ

Additional technical parameters
Testing time: adjustable from 10 seconds to 99 minutes (adjustable)
Fixed test voltages provided: 100V, 250V, 500V, 1000V, 2500V, 5000V, 10000V
Custom test voltage range: 50V ~ 10000V (minimum step 10V; single-button shuttle control cycles steps between 10V, 100V and 200V depending on shuttle speed)
Voltage output accuracy: 0% ~ +10%
Short-circuit current: 1 mA ~ 6 mA, adjustable in 1 mA steps (short-circuit current accuracy ±5%)
Continuous output power: 5W
Voltmeter measuring range: AC/DC 10V ~ 660V, accuracy ±(2% + 3 digits)
AC voltage frequency measurement: 25Hz ~ 85Hz, resolution 0.1Hz, accuracy ±0.2Hz
Output voltage measurement precision: ±(2% + 3 words/characters) as indicated in table
Capacitance measurement range: 10 nF ~ 25 μF (test voltage ≥ 100V); capacitance accuracy ±10% ±5 nF
Capacitance discharge rate: from 10 kV down to 50V ≤ 0.47 s/μF

Power / Battery / Charger / Electrical
AC power: 85 ~ 264 Vrms, 50/60 Hz, 65 VA
Built-in battery: 16.8V, 4400 mAh lithium battery
Built-in charger: 16.8V, 2.3A
Battery life example: 5 kV @ 100 MΩ load, about 6 hours

Mechanical & Environmental
Dimensions: 320 mm (length) × 270 mm (width) × 150 mm (height)
Weight: 3.9 kg
Operating temperature: -10 °C ~ 50 °C
Relative humidity: < 90% (no condensation)

Notes
Data in the product page table include ranges, resolutions, full-scale correspondences and accuracies for multiple test voltages; the tester supports fixed and custom voltages up to 10,000 V and provides insulation resistance ranges up to the terohm/tens-of-terohm scale. The product also supports capacitance measurement and controlled discharge characteristics.

Caractéristiques / spécifications techniques

• Brand: Huazheng
• Test voltages (fixed): 100V, 250V, 500V, 1000V, 2500V, 5000V, 10000V
• Custom test voltage: 50V ~ 10000V (step 10V minimum)
• Insulation resistance measurement range: from ohm/kΩ up to TΩ (see detailed table mapping ranges to full-scale values)
• Short-circuit current: 1 mA ~ 6 mA (adjustable), accuracy ±5%
• Test time: adjustable 10 s ~ 99 min
• Continuous output power: 5 W
• Voltmeter: AC/DC 10 V ~ 660 V, accuracy ±(2%+3)
• AC frequency measurement: 25 Hz ~ 85 Hz, resolution 0.1 Hz
• Capacitance range: 10 nF ~ 25 μF, accuracy ±10% ±5 nF; discharge ≤0.47 s/μF from 10 kV to 50 V
• Power input: 85 ~ 264 Vrms, 50/60 Hz, 65 VA
• Battery: 16.8 V, 4400 mAh (internal); charger 16.8V 2.3A; battery life example ~6 hours at 5kV/100MΩ load
• Dimensions: 320 × 270 × 150 mm; Weight: 3.9 kg
• Operating conditions: -10 °C ~ 50 °C; RH <90% (no condensation)