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| Brand | Zhonghangdingli |
|---|---|
| Origin | Beijing, China |
| Model | QS87 |
| Capacitance Range | 0.1Cₙ to 1000Cₙ (7-digit resolution) |
| tanδ Range | −110% to +110% |
| tanδ Accuracy | ≤ 0.2% rdg ± 1×10⁻⁵ |
| tanδ Resolution | 1×10⁻⁶ (1×10⁻⁷ with PC interface) |
| Test Voltage | 0–1000 kV (±1%, 4-digit display) |
| Frequency Range | 35–65 Hz (±1 Hz, 4-digit display) |
| Optional capacitance range extender extends ratio from 1000 | 1 to 10⁶:1 |
| Brand | Zhonghang Dingli |
|---|---|
| Origin | Beijing, China |
| Model | QS87 / QS37 Series |
| Capacitance Range | 0.1Cₙ to 1000Cₙ (7-digit resolution) |
| tgδ Range | −110% to +110% |
| tgδ Accuracy | ≤ 0.2% rdg ± 1×10⁻⁵ |
| tgδ Resolution | 1×10⁻⁶ (1×10⁻⁷ with PC interface) |
| Test Voltage | 0–1000 kV (±1%, 4-digit display) |
| Frequency Range | 35–65 Hz (±1 Hz, 4-digit display) |
| Optional Capacitance Ratio Extender (1000 | 1 → 10⁶:1) |
| Brand | Zhonghang Dingli |
|---|---|
| Origin | Beijing, China |
| Model | QS37a |
| High-Voltage Source | 0–2500 V (50 Hz), 0–20 mA |
| Built-in Standard Capacitor | 100 pF (tanδ < 5×10⁻⁵) |
| Measurement Principle | Schering Bridge (Classical Westinghouse/Schering configuration, “direct connection” method for ground-insulated specimens) |
| Capacitance Range (Cₙ = 100 pF, R₄ = 3183.2 Ω) | 40 pF – 20,000 pF ±(0.5% Cₓ + 2 pF) |
| Dissipation Factor Range (tanδ) | 0–1 ±(1.5% tanδₓ + 1×10⁻⁴) |
| Alternate Range (R₄ = 318.3 Ω) | Cₓ = 4–2000 pF |
| Electrode System | Three-terminal guarded electrode per GB/T 1409—2006 (IEC 60250), measuring electrode Ø50 mm (19.6 cm²), guard gap adjustable 0–5 mm, null tanδ ≤ 3×10⁻⁵ at 2000 V |
| Operating Ambient | 20 ± 5 °C, RH 65 ± 5% |
| Dimensions | Ø210 × H180 mm |
| Weight | 6 kg |
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