Specifying factory direct advanced earth resistivity and impedance tester factory for Wholesale and OEM Orders
What This Product Is and Where It Fits
The instrument measures soil resistivity and grounding impedance using a four‑terminal Wenner or Schlumberger array, delivering data for substation design, pipeline cathodic protection, and lightning‑risk assessments. It ships as a rugged field unit with a sealed IP67 enclosure, rechargeable lithium pack, and a built‑in GPS logger for site tagging.
Typical buyers are utility procurement teams, EPC contractors, and private‑label brands that need a ready‑to‑brand platform without investing in custom firmware or mechanical redesign.
Where Cheaper Alternatives Fall Short
The complaint that repeats across reorders is drift in measured resistance after repeated temperature cycles, caused by low‑grade reference resistors and insufficient shielding. Most quality disputes start with a consistency gap between the factory calibration certificate and the field reading after six months of service.
Inspection Standards
| Field Condition | Common Failure | Spec Limit |
|---|---|---|
| -20 °C to 50 °C ambient, 95 % RH | Reference resistor drift >0.5 %/°C | ±0.1 %/°C max, 0.05 % typical |
| High‑voltage transients (≤10 kV) | Front‑end latch‑up, data loss | IEC 61010‑1 CAT IV 600 V, surge withstand 12 kV |
| Repeated drop from 1 m onto concrete | Cracked enclosure, misaligned electrodes | IK08 impact rating, electrode alignment ±0.2 mm |
How It Performs in Use
The measurement engine runs a synchronous detection algorithm at selectable frequencies from 0.5 Hz to 10 kHz, suppressing 50/60 Hz mains interference by >120 dB. A 24‑bit sigma‑delta ADC yields a resolution of 0.001 Ω on the 0–2000 Ω range, with a typical repeatability of ±0.2 % of reading.
Battery life exceeds 30 hours of continuous logging at 1 Hz sample rate; the pack can be hot‑swapped without losing GPS timestamps. Firmware updates are delivered over USB‑C DFU, preserving calibration constants stored in protected flash.
How to Choose Before Requesting a Quote
Two configuration axes drive cost and capability: frequency span and electrode kit. The table below summarises the trade‑offs.
Standard Band (0.5 Hz–1 kHz)
- Covers 90 % of utility grounding surveys
- Lower BOM cost, shorter calibration time
- Suitable for private‑label SKU under $1,200
Extended Band (0.5 Hz–10 kHz)
- Enables soil‑layer modelling and corrosion studies
- Requires premium front‑end ASIC, adds $350–$450
- Typical for OEM partners targeting engineering firms
What Can Be Customised and What Cannot
Customisation is limited to branding, packaging, and a few firmware parameters. The mechanical envelope, electrode geometry, and calibration routine are fixed to maintain type‑test compliance.
- Logo silk‑screen on enclosure (max 2 colours, Pantone matched)
- Custom boot‑screen bitmap (320 × 240, 16‑bit)
- User‑selectable default frequency set (up to 5 presets)
- Packaging: plain brown carton, branded colour box, or reusable hard case
Changes to the ADC reference, electrode spacing, or IP rating require a new type test and are not offered under the standard OEM programme.
OEM and ODM Programme Structure
The OEM track delivers a fully tested unit with your artwork applied at the final assembly station. Lead time adds 5 business days for artwork approval and print setup. The ODM track allows firmware‑level feature gating (e.g., disabling advanced modes for a budget SKU) but requires a minimum 500‑unit commitment to amortise the validation effort.
Both programmes include a first‑article inspection report, a 12‑month warranty on electronics, and a 24‑month warranty on the enclosure seal. Spare‑part kits (battery, electrode caps, USB‑C cable) are stocked for immediate dispatch.
Request OEM/ODM programme detailsCapacity, Tooling and Scheduling
Production runs on a dedicated SMT line with a capacity of 2,000 units per month. Tooling for custom silk‑screen and packaging is amortised over the first order; subsequent orders incur only material cost.
Lead Time & MOQ
| MOQ (units) | Lead Time (weeks) | Tooling Setup (days) |
|---|---|---|
| 100 | 4 | 7 |
| 500 | 3 | 5 |
| 1,000+ | 2 | 3 |
Setup, Use and Replacement Parts
Initial setup: charge battery to 100 %, pair GPS via the on‑screen wizard, and run the built‑in self‑test (takes 90 seconds). The self‑test verifies reference resistor integrity, ADC linearity, and electrode continuity.
Maintenance rule: recalibrate the reference resistor every 12 months or after 500 hours of operation, whichever comes first. Use the factory‑supplied 0.01 % standard resistor kit; do not substitute third‑party parts or the calibration certificate becomes void.
Replacement parts list (stocked, same‑day ship): lithium pack (3.7 V, 10 Ah), electrode cap set (4 pcs), USB‑C cable (1 m), rugged carry strap. Firmware rollback is supported via the DFU utility on the support portal.
Next Steps
Submit a sample request to evaluate measurement repeatability on your test site. The sample kit includes a calibrated unit, electrode kit, and a 30‑day trial licence for the cloud data platform.
Request a sample unit
