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Length Deflection Compensation Banner

Larson System's Testers Come With Length Deflection Compensation Standard!

Our testers have built in length deflection compensation. Our pre-programmed calculations will measure the load cell compression and correct the length. We do the measuring and the math for you, creating greater accuracy in testing results.

LSI's STAR Series testers are motorized compression and extension force and length testing systems. With their numerous load range capacities and load cell interchangeability, these testers will test a wide variety of springs or other test material. The RoboSTAR comes standard with a high performance 1,000 lb servo motor / ball screw drive; 2,000 or 3,000 lb drive and super precision capabilities are optional.

This tester has solid machined aluminum construction with a heavy steel support riser as a backbone to build on, making it the most rigid workbench machine built by LSI. This C-frame style has high rigidity and low deflection characteristics that are commonly found in bridge style frames. Linear guideways make for smooth and precise motion and a servo motor and ball screw drive offers reliable and responsive testing. Unseen features like load cell and frame deflection compensation, length linearization, and smart load cell recognition make accurate and consistent testing easy by any operator.

These testers have software and mechanical overloads that protect from load cell stress damage – use our testers with confidence. Switching load cells is fast – it takes just minutes to change each load cell. Each smart interchangeable load cell has a signature that is read by the tester on power up and requires no special steps by the user. Change it and forget it!

Part Testing CapacityUse LSI accessories to easily test difficult parts. A wide variety of load buttons, support platforms and hooks make the tester very versatile and convenient to use. The STAR series comes standard with 5/16-18 tapped holes in the center of the platforms for accessories or special fixtures.

These testers have a fast learn cycle. A new operator can make or modify test programs within minutes. Full use of all of the features can be learned in only an hour or two. The STAR system will be in use the same day it arrives and will be indispensable within a short time.

Each machine comes standard with NIST traceable calibration and is very insensitive to temperature variations for accurate testing over a wide range of conditions. In less than five minutes, accuracy can be verified by the user to comply with ISO 9000 standards, with built in shunt calibration or by using our Master Calibrated Spring.

Flexibility is the key to the STAR Series testing systems. These stand-alone systems are excellent for use in an inspection room or test lab yet are rugged enough for use right on the factory floor. They have incredible flexibility, allowing the operator to test a huge variety of test points and test configurations; from a simple one point F@L test to more complex 99 point tests, the STAR will get the job done.

Two load cell mounting
spots increase the
maximum range by 4"

Automated Operation
Computer controlled, motorized compression/extension for the same test every time.

Operator Independent Repeatable Testing
Your setup person, operator and inspector all get the same answers every time with simple programming, standardized setup, automatic testing and no button printing. The STAR is capable of good gage R&R's on tight tolerance springs.

The STAR is an excellent tool for the inspection lab. The user can perform many tests, from springs to tensile testing and other various materials testing.

Typical test cycles range from 3.5 to 10 seconds. Send samples and test requirements to LSI for a specific rate quotation. Production monitor screens to setup and measure testing productivity.

Test Flexibility
Test one or two points, preset, measure free length, initial tension, rate or multiple rate and compare to specifications all in a single test cycle.

Having interchangeable load cells means that the same tester can be used to test from 0.5 g to 3,000 lb. Stretch your spring extension testing capability with the modular extension bridge assembly.

Standard Features

  • Standard 15" range (11" + 4" load cell offset)
  • Standard 11" stroke
  • Up to 8" Ø platform (2" standard)
  • Up to 0.0001" length resolution (0.0005" standard)
  • 2 to 3,000 lb load capacities
  • FLASH interface
  • Adjustable travel / test speed
  • Compression and extension testing of force and length
  • Touch screen / Full color LCD graphics
  • Integrated Windows 10  win10 logo
  • Digital calibration
  • NIST traceable calibration
  • Built in deflection compensation
  • Multiple measurement units (mm, in, lb, kg, N)

Safety Features

  • Test abort button
  • Easy access to emergency shutoff
  • Mechanical overload stops
  • Software length / force limits

Mechanical Features

  • 120 volt Whisper servo drive on 1,000 lb systems
  • 240 volt single phase servo drive on 2,000 and 3,000 lb systems (NEMA 6-15 connector plug)
  • 1" Ø preloaded / pretensioned ball screws
  • Rigid preloaded linear bearings
  • Smart interchangeable load cells (choose from 9)
  • Up to 2" thru-rod (with thru-rod capable load cell)
  • Optional thru-rod accessory kit mounts directly to machine
  • Extension hooks stored directly on machine for easy access
  • Many testing accessories


  • Ethernet port for PC network access
  • USB for easy printing / software updates
  • RS 232
  • Automation interface
  • Remote support / diagnostic capability via the internet
Force Specifications
Load Cell
Standard Resolution
0-20% FS 20-100% FS
2 lb 0.0001 lb 0.001 lb
907 g 0.02 g 0.2 g
8.9 N 0.0002 N 0.002 N
11 lb 0.0002 lb 0.002 lb
5 kg 0.1 g 1 g
49 N 0.001 N 0.01 N
22 lb 0.0005 lb 0.005 lb
10 kg 0.2 g 2 g
98 N 0.002 N 0.02 N
66 lb 0.001 lb 0.01 lb
30 kg 0.5 g 5 g
294 N 0.005 N 0.05 N
110 lb 0.002 lb 0.02 lb
50 kg 0.001 kg 0.01 kg
489 N 0.01 N 0.1 N
200 lb 0.005 lb 0.05 lb
91 kg 0.002 kg 0.02 kg
890 N 0.02 N 0.2 N
550 lb 0.01 lb 0.1 lb
249 kg 0.005 kg 0.05 kg
2,447 N 0.05 N 0.5 N
1,000 lb 0.02 lb 0.2 lb
454 kg 0.01 kg 0.1 kg
4,448 N 0.1 N 1 N
2,000 lb 0.05 lb 0.5 lb
907 kg 0.02 kg 0.2 kg
8,896 N 0.2 N 2 N
3,000 lb 0.1 lb 1 lb
1,361 kg 0.05 kg 0.5 kg
13,345 N 0.5 N 5 N
Accuracy = ± Full Scale Resolution x 2
Length Specifications
Standard Resolution High Resolution*
0.0005 in (± 0.001 in) 0.0001 in (± 0.0005 in)
0.01 mm (± 0.02 mm) 0.001 mm (± 0.01 mm)
*Requires High Resolution Length option 025-0000-0417-00
Ordering Information
Part Number Description Price
050-0000-0094-00 RoboSTAR 11 (choose a drive capacity below) Quote
050-0000-0095-00 RoboSTAR 25 (choose a drive capacity below)
Contact us if you are interested in this product
025-0000-0419-03 1,000 lb High Capacity Drive (120 VAC, single phase) Quote
025-0000-0419-00 2,000 lb High Capacity Drive (240 VAC, single phase) Quote
025-0000-0419-02 3,000 lb High Capacity Drive (240 VAC, single phase) Quote
Factory Options
025-0000-0425-02 Extension Bridge Assembly Quote
025-0000-0299-01 Sorter / Automation Interface Port Quote
Accuracy Options
025-0000-0417-00 High Resolution Length Quote
FLASH Tester Software - Click here for more info
050-1000-0039-00 Basic Software Package Quote
050-1000-0039-01 Extra Software Package Quote
050-1000-0039-02 Pro Spring Software Package Quote
050-1000-0039-03 Fatigue Testing Software Package Quote
050-1000-0039-04 Pro Material Software Package Quote
050-1000-0039-05 Pro Ultimate Software Package Quote
Load Cells
025-0000-0414-01 2 lb Smart Interchangeable Load Cell (2" Ø platform) Quote
025-0000-0414-02 11 lb Smart Interchangeable Load Cell (3.5" Ø platform) Quote
025-0000-0414-03 22 lb Smart Interchangeable Load Cell (3.5" Ø platform) Quote
025-0000-0414-04 66 lb Smart Interchangeable Load Cell (3.5" Ø platform) Quote
025-0000-0414-05 110 lb Smart Interchangeable Load Cell (3.5" Ø platform) Quote
025-0000-0414-06 200 lb Smart Interchangeable Load Cell (3.5" Ø platform) Quote
025-0000-0415-01 550 lb Smart Interchangeable Load Cell (3.5" Ø platform) Quote
025-0000-0415-02 1,000 lb Smart Interchangeable Load Cell (3.5" Ø platform) Quote
025-0000-0415-03 2,000 lb Smart Interchangeable Load Cell (3.5" Ø platform) Quote
025-0000-0416-01 2,000 lb Smart Interchangeable Load Cell (3.5" Ø platform, for high rate parts) Quote
025-0000-0414-19 3,000 lb Smart Interchangeable Load Cell (3.5" Ø platform, 2" Ø thru-hole) Quote
025-0000-0449-00 Fatigue Plate Assembly (Requires Fatigue Test Function) Quote
059-1000-0023-00 Dust Cover Quote
025-0000-0439-01 8" Ø Platforms (5/16-18 thread) Quote
025-0000-0464-01 Inkjet Printer (Includes USB Cable) Quote
Installation / Training
100-0000-0006-00 On-Site Installation & Training Quote

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Larson Systems Inc.
13847 Aberdeen Street NE
Ham Lake, MN 55304
Phone: 763-780-2131
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