china dissipation factor tan delta meter price: Specification, Ordering and Quality Notes
The core trade-off for a tan delta meter is measurement resolution at low dissipation factors versus the maximum test voltage and portable form factor. Achieving 0.01% resolution at 10 kV demands a shielded bridge circuit and temperature compensation that adds 2–3 kg and roughly 15% to the BOM compared to a 5 kV unit with 0.1% resolution. Buyers specifying a private-label unit must decide which corner of that triangle — accuracy, voltage, weight — their end users cannot compromise.
Where Cheaper Alternatives Fall Short
Low-cost meters skip the guarded bridge topology and rely on single-ended voltage dividers.
Without a guarded measurement path, leakage currents along the test leads and connector insulation become indistinguishable from the specimen’s dielectric loss, especially when tan delta drops below 0.5%. The result is a systematic positive bias that grows with humidity and cable length, making the instrument unreliable for condition monitoring of XLPE cables or transformer bushings where trending requires repeatability better than 0.05%. Our design uses a fully shielded, three-terminal bridge with active guarding driven by a low-noise amplifier, keeping the measurement error below 0.02% across the 0.1 Hz–200 Hz band even with 10 m test leads.
How It Performs in Use
The instrument applies a sinusoidal test voltage up to 12 kV RMS and measures the in-phase and quadrature current components with a 24-bit sigma-delta ADC.
A digital lock-in algorithm rejects harmonics and mains interference, delivering a tan delta reading updated every 0.5 s. Temperature correction follows IEC 60250 coefficients for oil, paper, and XLPE, selectable via the front panel or the Modbus/TCP interface. The table below compares the two standard front-end architectures we offer for private-label builds.
| Parameter | Guarded Bridge (Standard) | High-Voltage Divider (Option) |
|---|---|---|
| Max test voltage | 12 kV RMS | 30 kV RMS |
| Tan delta range | 0.001% – 50% | 0.01% – 100% |
| Accuracy at 1% | ±0.5% rdg ±0.01% | ±1% rdg ±0.02% |
| Weight (incl. battery) | 4.2 kg | 6.8 kg |
| Typical lead time (50 pcs) | 6 weeks | 8 weeks |
Where This Product Beats Standard Alternatives
Calibration traceability is maintained per unit, not per batch.
Every meter leaves our line with an individual calibration certificate referencing a 10 kV reference capacitor stable to ±10 ppm/°C. The calibration fixture is automated: a robotic arm connects the DUT to the reference standard, runs the full frequency sweep, and stores the correction coefficients in the unit’s EEPROM. That process adds 45 minutes per unit but eliminates the ±0.1% inter-unit scatter typical of manual calibration. For a private-label buyer, it means the spec sheet numbers are guaranteed for each serial number, not just the type test report.
Who Uses It and Where It Matters
Utility asset managers and high-voltage laboratory technicians.
The meter is deployed for routine condition assessment of GIS bushings, power transformers, and cable joints where a rising tan delta trend signals moisture ingress or aging. It also serves factory acceptance testing of insulation systems up to 500 kV. The customization table below shows the most requested private-label configurations.
| Customization | Options | MOQ Impact |
|---|---|---|
| Enclosure branding | Laser etch, silk screen, or molded logo | No MOQ change |
| Connector type | SHV, BNC, or custom high-voltage plug | +2 weeks if new tooling |
| Firmware language | English, Chinese, Spanish, Russian | Included at 20 pcs |
| Calibration points | Up to 10 user-defined frequencies | +1 week per extra point |
Working as a Production Partner, Not a Catalogue Supplier
We allocate a dedicated test fixture and calibration slot for each private-label project.
That fixture is amortized over the forecast volume; at 100 units per year the fixture cost adds less than 3% to the unit price, while at 20 units it adds 12%. We share the amortization schedule upfront so the buyer can model total cost of ownership. Firmware branches are maintained in a private repository with versioned releases tied to the buyer’s part number, ensuring that a field update never overwrites a custom calibration coefficient. Lead time for repeat orders drops to three weeks once the fixture is qualified because the burn-in and calibration steps run in parallel with assembly.
How Consistency Is Held Across Batches
Statistical process control on the bridge resistor network.
The four arms of the Wheatstone bridge use 0.01% foil resistors matched to ±5 ppm/°C. Each resistor lot is screened on a 10-channel automated bridge before kitting; any resistor drifting more than 2 ppm after 168 h at 85 °C / 85% RH is rejected. The ADC reference voltage is derived from a buried-zener reference with 1 ppm/°C drift, calibrated against a 7.5 V Josephson array standard quarterly. These controls keep the tan delta measurement stability within ±0.005% over a 12-month recalibration interval, which is the figure most utility calibration labs require for their uncertainty budgets.
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