Electric Bridge
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| Key | Brand: HOPE-MED |
|---|---|
| Model | 8190B |
| Origin | Tianjin, China |
| Instrument Type | TEER Measurement System |
| Measurement Frequencies | 100 Hz, 1000 Hz |
| Applied Voltage Range | 0.01–3.00 V (0.01 V step resolution) |
| Sample Capacity | 25 parallel excised skin mounts |
| Data Export | USB flash drive interface |
| Compliance Context | Designed for OECD TG 439 / ISO 10993-10 pre-screening workflows |
| Brand | ISOTECH |
|---|---|
| Origin | United Kingdom |
| Model | microK |
| Measurement Principle | Four-Terminal Resistance Ratio Metrology with Alpha-Delta ADC Architecture |
| Primary Application | Primary and Secondary Thermometry Calibration (SPRT, PRT, Thermistors, Thermocouples) |
| Channel Capacity | 3 Parallel Input Channels (Expandable to 90 via External Multiplexers) |
| Display | 6.4" TFT Color Touchscreen Running Windows CE |
| Data Export | Native Excel (.xls) Format via USB Storage |
| Terminal Interface | Gold-Plated Tellurium-Copper CablePod™ Sockets Accepting 4 mm Banana, Flat Blade, and Bare Wire |
| Thermal EMF Performance | < 0.1 µV Typical Contact EMF |
| Stability | < 3 ppm/year Voltage Drift |
| Compliance | Designed for ISO/IEC 17025 Accredited Laboratories |
| Brand | Red Sun Instrument |
|---|---|
| Origin | Hebei, China |
| Manufacturer Type | Authorized Distributor |
| Country of Origin | China |
| Model | HRDQ-37 |
| Price | USD 5,300 (FOB) |
| Compliance | GB 1409, GB 5654, GB/T 1693, ASTM D150-1998(2004) |
| Max Test Voltage | 10 kV AC (40–70 Hz) |
| Standard Capacitor | 100 pF built-in |
| Accuracy Class | Capacitance Ratio ±0.001%, tanδ ±0.5% |
| Measurement Method | Current-Comparator-Based Schering Bridge with Magnetic-Flux Balance Null Detection |
| Input/Output Terminals | HD, HS, LD, LS + Shielded Guard Pairs |
| 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 |
| 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 | 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 |