Inside APEKS: How Our GNSS Receivers Are Made & Tested
Every APEKS device — from AP-series GNSS receivers to the APS1 handheld and AM02i total station — goes through a structured manufacturing and quality control process before shipment: precision PCB and housing assembly, functional calibration testing, environmental chamber temperature testing, and multi-tier burn-in aging tests to catch early failures before they reach the field. This process reflects APEKS' approach to reliability — not just designing accurate hardware, but verifying that accuracy holds up before a single unit leaves the factory.
1. Why Manufacturing Process Matters as Much as Specs
A surveying instrument's specification sheet can tell a buyer how accurate a receiver should theoretically be. However, what truly determines whether an instrument maintains stable, centimeter-grade performance over years of rugged field operations is manufacturing precision and the rigor of pre-shipment quality verification.
Low-quality devices and professional-grade receivers often appear similar on paper. The practical distinction lies in processes that never appear on a spec sheet: comprehensive thermal burn-in aging, multi-axis functional calibration, and environmental chamber testing. These manufacturing steps ensure that equipment performs reliably under demanding field conditions rather than failing during mission-critical surveys.
2. GNSS Receiver Production: Assembly to Aging Test
Antenna housing components and internal subassemblies are prepared and stored on dedicated subassembly racks to ensure proper organization and dust-free handling prior to final integration.
Core multi-band GNSS processing boards, battery chassis, and internal harnesses are precisely aligned and mounted into receiver lower housings on standardized workbenches.
Factory technicians assemble internal electronics, fasten structural chassis screws with calibrated torque tools, and secure environmental sealing gaskets across production batches.
Each assembled receiver is paired with a handheld field controller to verify multi-constellation satellite tracking, RTK fixed initialization, UHF/4G telemetry, and IMU sensor responsiveness.
Receivers are placed in programmable environmental test chambers to verify electronic stability, signal retention, and material integrity under extreme thermal stress.
Units undergo continuous powered operation on multi-tier aging racks, filtering out latent electronic defects and infant mortality failures before final packaging.
3. APS1 Handheld Production: Compact Doesn't Mean Less Tested
The APS1's compact 210g design doesn't mean a shortened testing process. Each unit goes through internal module installation, casing and PCB assembly, firmware flashing and testing, and batch aging charging tests to verify battery and charging circuit reliability — before being packed into its carry case for shipment.
4. AM02i Total Station Production: Optical Precision Assembly
Total station manufacturing carries an additional layer of precision requirement: optical alignment. Each AM02i unit undergoes internal circuit precision assembly, optical collimator calibration testing to verify the telescope's line-of-sight accuracy, and display assembly — critical steps for a device whose core value proposition is angular measurement accuracy.
5. What Burn-In and Environmental Testing Actually Catch
Symptom: Electronic positioning equipment failures frequently occur during the initial operational period (infant mortality failure rate) rather than after years of regular field use.
Cause: Microscopic component flaws or cold solder joints from manufacturing often pass brief, standard on/off functionality tests, but break down under sustained electrical load and thermal cycling.
Fix: Burn-in testing subjects every unit to continuous powered operation under controlled environmental stress for extended periods. This actively filters out latent component vulnerabilities at the factory level, ensuring delivered instruments arrive in the field fully stabilized.
6. FAQ
What is burn-in testing and why does it matter for GNSS equipment?
Burn-in testing is a quality control process where fully assembled GNSS receivers run continuously under powered load and controlled thermal conditions. It forces early electronic component failures (infant mortality) to surface in the factory rather than in the field during critical surveying projects.
Does every APEKS unit go through environmental chamber testing?
Yes. Production batches undergo environmental chamber testing where instruments are exposed to high and low temperature stress cycles to verify that internal circuitry, GNSS baseband tracking, and sealing gaskets maintain full performance standards under harsh climatic conditions.
How is total station optical accuracy verified during manufacturing?
Every AM02i total station is calibrated using precision multi-collimator optical test stands. Technicians verify reticle alignment, telescope line-of-sight collimation, horizontal and vertical angle reading accuracy, and EDM laser alignment against calibrated optical benchmarks.
Is the APS1 tested as thoroughly as larger GNSS receivers?
Yes. Despite its ultra-compact 210g form factor, the APS1 undergoes the same rigorous quality control regimen: multi-board assembly inspection, firmware diagnostics, charging and power circuit burn-in, and full RTK fixed functional calibration before packaging.
TESTED BEFORE IT SHIPS. NOT AFTER IT FAILS.
Every APEKS device passes functional calibration, environmental chamber testing, and multi-tier burn-in aging before leaving our factory — reliability built in, not hoped for.
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- ISO 17123-8:2015 — Field Procedures for GNSS RTK Instruments
- ISO 17123-3:2001 — Field Procedures for Testing Total Stations
- APEKS Manufacturing Quality Control Standards Manual, 2026
- APEKS AP-Series & APS1 Hardware Reliability Engineering Brief