Magnet System FAT vs SAT: Acceptance Testing for Export Projects

magnet system FAT SAT acceptance testing for exported electromagnet and Helmholtz coil systems

For exported magnet systems, acceptance testing should not be treated as an afterthought.

When an electromagnet, Helmholtz coil system, three-axis field system, or large custom magnetic field platform is shipped internationally, both the supplier and buyer need a clear answer to one question:

“Where and how do we confirm that the system meets the agreed requirements?”

This is where Factory Acceptance Test (FAT) and Site Acceptance Test (SAT) become important.

FAT checks the system before shipment at the supplier’s facility.
SAT checks the system after delivery and installation at the buyer’s site.

Both are useful, but they do not test the same things. For exported magnet systems, misunderstanding this difference can lead to disputes, delays, and unclear responsibility after delivery.

1. What Is a Factory Acceptance Test?

A Factory Acceptance Test, or FAT, is performed before shipment, usually at the manufacturer’s or supplier’s facility.

The purpose is to verify that the magnet system has been built according to the agreed technical scope and can pass defined tests under factory conditions.

TÜV Rheinland describes factory acceptance testing as verification that technical and quality requirements have been met before a component leaves the factory.
Reference link: https://www.tuv.com/world/en/factory-acceptance-test.html

For Magnet Systems, FAT May Include

Visual inspection
Mechanical dimension check
Coil resistance measurement
Insulation test
Power supply operation test
Maximum current test
Magnetic field output test
Field-current relationship
Basic uniformity check
Cooling function check
Temperature rise test
Software communication test
Safety interlock check
Cable and connector inspection
Packing list verification
Factory photos or video record
FAT report

FAT is especially valuable for exported magnet systems because it reduces the risk of discovering major problems only after international shipping.

2. What Is a Site Acceptance Test?

A Site Acceptance Test, or SAT, is performed after the system arrives at the buyer’s site and is installed in the real operating environment.

The purpose is to confirm that the delivered system is installed correctly, works with the buyer’s infrastructure, and is ready for practical use.

Operations1 defines SAT as a process in which a machine or plant is tested and accepted at the customer’s site, confirming that the system has been properly installed, configured, and is ready for operation.
Reference link: https://operations1.com/en/glossary/site-acceptance-test

For Magnet Systems, SAT May Include

Unpacking inspection
Shipping damage check
Installation verification
Power connection check
Cooling connection check
Grounding and safety review
System startup
Basic field output verification
Software communication check
Integration with local equipment
Fixture or sample access check
Environmental magnetic background check
Operator training
SAT report

SAT is important because some performance issues only appear in the real installation environment.

3. FAT and SAT Are Not the Same Test

FAT and SAT are related, but they serve different purposes.

FAT Answers

Was the system built correctly before shipment?
Does it meet the agreed factory test scope?
Are the main components working?
Does the magnet produce the expected field under factory conditions?
Are the documents and accessories ready for delivery?
Is the system safe to ship?

SAT Answers

Did the system arrive without damage?
Is it installed correctly?
Does it work with local power, cooling, software, and lab infrastructure?
Is the test environment suitable?
Can the buyer operate it in the intended application?
Are there site-related issues that affect performance?

A FAT cannot fully replace a SAT.
A SAT cannot fix an unclear FAT.

For exported systems, both should be defined before the order is confirmed.

4. Why Exported Magnet Systems Need Clear Acceptance Boundaries

International delivery creates extra risk.

Exported magnet systems may involve:

Long-distance shipping
Wooden crate packing
Customs clearance
Handling by freight forwarders
Site installation by the buyer
Local power standards
Cooling water differences
Environmental magnetic interference
Existing lab equipment integration
Remote technical support

If acceptance criteria are unclear, both sides may disagree later.

For example:

Is a field deviation caused by the coil, the local environment, or nearby steel structures?
Is a software issue caused by the system, computer settings, or local network restrictions?
Is cooling performance limited by the chiller, water flow, or room temperature?
Is a damaged connector a factory issue or shipping issue?
Is a field uniformity problem caused by wrong sample position?

These questions are much easier to handle when FAT and SAT scopes are written clearly.

5. What FAT Can Confirm for an Electromagnet

For an exported electromagnet system, FAT can usually confirm the core factory-level performance.

Typical FAT Items for Electromagnets

Pole gap measurement
Pole face inspection
Yoke and frame inspection
Coil resistance
Insulation resistance
Power supply operation
Maximum current test
Magnetic field at specified gap
Field-current relationship
Cooling function
Temperature rise under defined conditions
Polarity and field direction
Basic safety protection
Cables and connectors
User manual and wiring notes

What FAT Cannot Fully Confirm

FAT usually cannot fully confirm:

Buyer’s site cooling quality
Buyer’s local power stability
Final installation vibration
Magnetic interference from nearby equipment
Integration with third-party instruments
Site-specific safety compliance
Long-term operation under buyer’s exact workflow

That is why SAT remains useful.

6. What FAT Can Confirm for a Helmholtz Coil System

For Helmholtz coil systems, FAT focuses on coil geometry, electrical performance, and field output.

Typical FAT Items for Helmholtz Coils

Coil dimensions
Axis alignment inspection
Coil resistance
Inductance, if required
Current driver test
Field-current relationship
Center field output
Basic uniformity verification
Three-axis polarity check
Driver communication
Software control
Cable labeling
Mechanical frame inspection
Packing and accessory check

A Helmholtz coil is commonly used to produce a region of nearly uniform magnetic field near the center, so geometry and test volume should be clearly defined when evaluating field performance.
Reference link: https://en.wikipedia.org/wiki/Helmholtz_coil

What FAT Should State Clearly

For Helmholtz coil FAT, the report should clarify:

Field range
Current used during test
Test position
Probe position
Uniform region, if measured
Axis tested
Driver used
Ambient conditions
Whether values are measured or calculated

Without this information, the FAT result may be hard to interpret.

7. What SAT Can Reveal After Installation

SAT often reveals issues that FAT cannot see.

Site-Related Issues

Examples include:

Nearby steel structures
Magnetic lab benches
Elevator motors or building infrastructure
Local magnetic noise
Incorrect grounding
Insufficient cooling water flow
Power supply input mismatch
Cable routing problems
Software permission restrictions
Space limitations
Installation alignment issues
Fixture or sample positioning errors

For magnetic calibration and low-field testing, the site environment can strongly affect results.

A system may pass FAT but still need careful site setup before reaching reliable measurement performance.

8. FAT Should Be Based on the Quotation Scope

FAT must match what was actually ordered.

If the order includes only a coil, FAT should not be judged like a complete turnkey system test.

If the order includes coil, power supply, cooling, fixture, software, and test report, then the FAT can cover more system-level functions.

Scope Examples

Coil-only FAT may include:

Dimensions
Resistance
Insulation
Basic field constant

Coil plus driver FAT may include:

Current output
Field-current relationship
Polarity
driver communication

Turnkey system FAT may include:

Coil
driver
software
fixture
cooling
safety functions
factory operation sequence
test report

Buyers should not assume the highest acceptance scope unless it is written in the quotation or technical agreement.

9. SAT Should Be Based on Site Conditions

SAT depends heavily on the buyer’s site readiness.

Before SAT, the buyer should prepare:

Correct power supply input
Cooling water or chiller
Installation space
Stable table or floor
Proper grounding
Computer or software access
Field probe, if required
Non-magnetic fixtures
Clear cable routing
Operator availability
Safety access
Local lifting or unpacking support

A SAT cannot succeed if the site is not ready.

For exported systems, this is especially important because the supplier may not be physically present and remote support may be used.

10. FAT Documentation: What Buyers Should Request

A good FAT report does not need to be unnecessarily long, but it should be clear and useful.

Useful FAT Documents

FAT checklist
System configuration list
Serial numbers
Visual inspection photos
Coil resistance results
Insulation test results
Field test results
Field-current curve
Uniformity data, if included
Temperature rise result, if included
Software test screenshots
Packing list
Deviation notes
Operation manual
Video record, if needed

For formal procurement projects, written documentation is not just administrative work. It helps both sides confirm what was tested before shipment.

NIST’s Quality System for Measurement Services is based on ISO/IEC 17025 and other measurement-service requirements, which reflects the importance of documented procedures, quality systems, and measurement confidence in technical work.
Reference link: https://www.nist.gov/nist-quality-system

11. SAT Documentation: What Buyers Should Prepare

SAT documentation should focus on installation and site readiness.

Useful SAT Documents

Unpacking inspection record
Shipping damage photos, if any
Installation checklist
Power connection confirmation
Cooling connection confirmation
Grounding check
Startup record
Basic field verification
Software communication confirmation
Site issue notes
Operator training record
SAT acceptance form

SAT documentation is especially useful when several parties are involved:

End user
Procurement department
Supplier
freight forwarder
installation team
university facility team
company safety team

Without documentation, responsibility becomes unclear.

12. Common Mistake: Expecting FAT to Prove Site Performance

FAT is performed under factory conditions.

It cannot fully prove performance under the buyer’s site conditions.

For example, FAT may show:

Correct coil resistance
Correct maximum field
Good power supply operation
Normal software communication
Acceptable temperature rise in factory conditions

But after installation, the buyer may still see:

Magnetic interference from the building
poor cooling flow
unstable local power
software restrictions
fixture misalignment
temperature differences
cable routing issues

These are not necessarily factory defects.

They may be site-related issues that SAT is designed to identify.

13. Common Mistake: Leaving SAT Undefined

Some buyers request SAT but do not define what it means.

This creates risk.

A meaningful SAT should state:

Who performs the test
Whether supplier presence is required
Whether remote support is acceptable
What site conditions must be ready
What performance will be checked
What instruments will be used
What acceptance criteria apply
How deviations will be recorded
What happens if site conditions are not ready

For exported systems, on-site SAT by supplier engineers may involve extra cost, visa requirements, travel schedule, and local safety rules.

If remote SAT support is acceptable, that should also be stated early.

14. Remote FAT and Remote SAT for Exported Systems

For many exported magnet systems, remote acceptance support is practical.

Remote FAT May Include

Photos
Test videos
live video call
FAT checklist
test data file
software demonstration
packing inspection

Remote SAT May Include

Video-guided unpacking
installation review
wiring confirmation
remote software setup
startup guidance
field verification support
troubleshooting

Remote acceptance does not replace all formal on-site procedures, but it can reduce risk and speed up communication.

For many university and laboratory systems, remote support is often a practical compromise.

15. Practical FAT Checklist for Exported Magnet Systems

Buyers can use the following FAT checklist as a starting point.

General Inspection

System model and configuration verified
Serial numbers recorded
Visual inspection completed
Accessories checked
Labels checked
Packing list reviewed

Electrical Test

Coil resistance measured
Insulation checked
Cable connection verified
Power supply output checked
Polarity confirmed
Protection functions checked

Magnetic Test

Field range tested
Field-current relationship recorded
Field direction confirmed
Uniformity checked, if included
Three-axis function checked, if applicable

Thermal and Cooling Test

Cooling function checked
Water flow checked, if applicable
Temperature rise tested, if included
Fan or chiller operation confirmed

Control and Software

Manual control checked
PC control checked
Communication interface verified
Basic software functions tested
Data logging tested, if included

Documentation

FAT report prepared
Manual prepared
Wiring guide included
Packing photos recorded
Deviation list included, if needed

16. Practical SAT Checklist for Exported Magnet Systems

SAT should focus on delivery condition, installation, and site readiness.

Delivery and Unpacking

Crate condition checked
Shipping damage inspected
Accessories confirmed
Photos recorded before and after unpacking

Installation

System positioned correctly
Power connected correctly
Cooling connected correctly
Grounding checked
Cable routing checked
Mechanical access confirmed

Startup

Power-on check completed
Cooling started, if required
Driver communication confirmed
Software launched
Emergency stop or protection checked, if included

Basic Performance

Low-current test performed
Field direction confirmed
Field output checked at defined point
Three-axis operation checked, if applicable
Fixture or sample access verified

Training and Handover

Operator guidance completed
Documentation reviewed
Basic maintenance explained
Site issues recorded
SAT acceptance form signed

17. How Cryomagtech Supports FAT and SAT for Exported Magnet Systems

Cryomagtech supplies electromagnets, Helmholtz coil systems, three-axis magnetic field systems, magnetic field drivers, and related accessories for research, calibration, and industrial testing applications.

For exported magnet systems, we can support:

Factory inspection
Coil resistance and insulation checks
Field-current relationship testing
Basic magnetic field verification
Power supply and driver testing
Software communication checks
Packing inspection
FAT documentation
Remote installation guidance
SAT checklist support
Operation documentation

👉 Product link placeholder: Cryomagtech Electromagnet and Helmholtz Coil Systems for Export Projects

For formal procurement projects, FAT and SAT should be discussed before order confirmation, not after shipment.

Clear acceptance boundaries protect both sides and help the system enter use faster.

References

TÜV Rheinland – Factory Acceptance Test
https://www.tuv.com/world/en/factory-acceptance-test.html
Operations1 – Site Acceptance Test Definition and Process
https://operations1.com/en/glossary/site-acceptance-test
NIST – Quality System for Measurement Services
https://www.nist.gov/nist-quality-system
Wikipedia – Helmholtz Coil
https://en.wikipedia.org/wiki/Helmholtz_coil

Key Takeaways

FAT verifies the magnet system before shipment under factory conditions.
SAT verifies the system after installation under the buyer’s site conditions.
FAT and SAT should not be treated as the same test.
For exported magnet systems, clear acceptance boundaries reduce disputes and delivery risk.
FAT should match the quotation scope; SAT should match site readiness and installation conditions.
Documentation, photos, videos, checklists, and reports are especially valuable for international projects.
Remote FAT and SAT support can be practical for many university and laboratory magnet systems.

For exported magnet systems, the right question is not only:

“Does the system work?”

The better question is:

“Where was it tested, under what conditions, against which acceptance criteria, and who is responsible for each stage?”