AC voltage transducer SGB-C

DCfor solar panels

Product Introduction
The SGB-C digital voltage divider is a precision instrument for AC and DC high-voltage measurement (50–300 kV range). It converts high voltage into a proportional low-voltage signal via a precision divider and digital processing, providing metrological-grade readings for field and laboratory use.

Product Characteristics

• High precision: precision HV thin-film capacitors and glass-glaze resistors deliver high input impedance and low test current; TBPU and high-performance amplifiers with dual-slope AD sampling yield a 4½-digit LCD resolution to 0.001 kV.
• Anti-interference design: multi-layer shielding with an aluminum-alloy spherical surface and fully shielded LV enclosure; high-quality coaxial connection minimizes electromagnetic interference and preserves linearity.
• Safe construction: HV divider filled/potted with DuPont dry dielectric material (oil-free) and coaxial separation between HV and LV for enhanced operational safety.
• Operator-friendly: AC/DC and high/low range toggle switches; clear 4½-digit LCD for on-site inspection.
• Portable: lightweight aluminum-alloy modular case for easy transport and field deployment.

Product Parameters
divider ratio: 1000:1
insulating medium: DuPont dry dielectric material
AC measurement: True RMS
operating conditions: temperature 0–40°C; humidity ≤85% RH

Specification Parameter
SGB-50C — AC: 50 kV / DC: 50 kV; Accuracy: AC 1.0% / DC 0.5%; Range: Low 0–20 kV, High 0–50 kV; Impedance: 600 MΩ; Signal lead: 5 m; Dimensions (mm): 180×180×620; Weight: 6 kg
SGB-100C — AC: 100 kV / DC: 100 kV; Accuracy: AC 1.0% / DC 0.5%; Range: Low 0–20 kV, High 0–100 kV; Impedance: 1200 MΩ; Signal lead: 5 m; Dimensions (mm): 180×180×900; Weight: 8 kg
SGB-150C — AC: 150 kV / DC: 150 kV; Accuracy: AC 1.0% / DC 0.5%; Range: Low 0–20 kV, High 0–150 kV; Impedance: 1800 MΩ; Signal lead: 8 m; Dimensions (mm): 250×250×1100; Weight: 15 kg
SGB-200C — AC: 200 kV / DC: 200 kV; Accuracy: AC 1.0% / DC 0.5%; Range: Low 0–20 kV, High 0–200 kV; Impedance: 2400 MΩ; Signal lead: 8 m; Dimensions (mm): 250×250×1330; Weight: 17 kg
SGB-300C — AC: 300 kV / DC: 300 kV; Accuracy: AC 1.5% / DC 1.0%; Range: Low 0–20 kV, High 0–300 kV; Impedance: 3600 MΩ; Signal lead: 10 m; Dimensions (mm): 250×250×1900; Weight: 22 kg

Application Scenarios

• Power transmission and substation acceptance testing: HV checks on transformers, switchgear and busbars.
• Periodic maintenance: insulation and operating voltage verification during overhauls.
• New energy commissioning: voltage validation for PV, ESS and HVDC systems prior to commissioning.
• Laboratory and metrology calibration: precision voltage measurement for tests and instrument calibration.
• Industrial on-site HV testing: commissioning, monitoring and fault diagnosis of large electrical equipment.

FAQ

• How is high precision achieved? — Precision HV film capacitors and glass-glaze resistors, high-input-impedance design, high-performance amplifiers and dual-slope AD sampling; display resolution 0.001 kV (4½ digits).
• Why stable long-term performance? — High-input-impedance reduces test current and self-heating; high-stability divider components minimise drift.
• Are measurements affected by HV environment interference? — Multi-layer shielding and coaxial connection reduce external electromagnetic interference to ensure stable results.

Change battery

• Turn off power to the LV display.
• Unscrew the four screws on the LV front panel and remove the panel.
• Unscrew the battery-box screw, open the cover and replace the 9V battery (observe polarity).

Notes

• Keep the measurement area free of sundries that could affect accuracy.
• Maintain a safe operating distance during HV tests.
• Verify all connections, especially ground.
• Wait until the meter returns to zero before re-entering the site.
• Discharge the instrument after DC high-voltage measurements.
• Do not exceed rated voltage; keep the surface clean and handle with care.
• Store the instrument in its case in a cool, dry place when not in use.
• Calibration recommended at least annually by an accredited metrology laboratory or factory service.

Technical specifications summary

• Series: SGB-C
• Measurement: AC and DC high voltage (50–300 kV)
• Divider ratio: 1000:1
• Display: 4½-digit LCD, resolution up to 0.001 kV
• Connection: dedicated coaxial HV–LV cable
• Signal lead lengths: model-dependent (5 m / 8 m / 10 m)
• Operating environment: 0–40°C; humidity ≤85% RH