File formats

The app reads and writes three kinds of file in your data folder: sample profiles (.sp), motion profiles (.mp), and recorded test data (CSV).

Sample profile — .sp

JSON describing a material's dimensions and test limits.

{
  "maxForce": 10,
  "maxVelocity": 50,
  "maxDisplacement": 120,
  "sampleWidth": 10,
  "sampleThickness": 2,
  "serial": "PDMS-10A"
}

Field	Unit	Meaning
maxForce	N	Test stops above this force
maxVelocity	mm/s	Velocity ceiling
maxDisplacement	mm	Test stops above this extension
sampleWidth	mm	Cross-section width (for stress)
sampleThickness	mm	Cross-section thickness (for stress)
serial	—	Sample / material identifier (also the profile's saved name)

serial stays on your computer

serial names and identifies the profile in the app and in your data folder. Only the five numeric limits are sent to the machine, so renaming a profile never changes how a test runs.

Motion profile — .mp

JSON describing the test motion: a list of sets, each repeated executions times, each containing ordered moves.

{
  "name": "Cyclic Tension",
  "description": "Preload then 3 load/unload cycles",
  "sets": [
    {
      "name": "Preload",
      "executions": 1,
      "moves": [
        { "moveType": "linear",
          "moveParameters": { "position": 5, "velocity": 5, "time": 0 } }
      ]
    },
    {
      "name": "Cycle",
      "executions": 3,
      "moves": [
        { "moveType": "math",
          "moveParameters": { "position": 0, "velocity": 0, "time": 0,
                              "waveform": "sine", "amplitude": 10, "frequency": 0.25 } },
        { "moveType": "dwell",
          "moveParameters": { "position": 0, "velocity": 0, "time": 500 } }
      ]
    }
  ]
}

Move parameters

moveType is linear, dwell, or math (waveform). Every move carries position, velocity and time (0 where unused); a math move adds the fields for its waveform:

Field	Used by	Meaning
position	linear, sigmoid	Where the move ends (mm, absolute: sample extension from zero length)
velocity	linear, sigmoid	Speed (mm/s)
time	dwell	Hold time (ms)
waveform	math	sine (the default when absent), sigmoid or chirp
amplitude	sine, chirp	Peak deviation (mm); its sign is the direction it sets off in
frequency	sine, chirp	Sine: cycles per second (Hz). Chirp: the frequency it starts at
endFrequency	chirp	The frequency it sweeps to (Hz)
duration	chirp	How long the sweep takes (s), rounded to whole cycles
acceleration	sigmoid	Peak acceleration (mm/s²)

Every position is absolute. A file with the old fields (absoluteOrRelative, distance, cycles, phase, centre, dwellHigh, dwellLow, skew, or a triangle waveform) is refused on load, import and run, with a message naming the move; rebuild it in Motion profiles.

Recorded data — CSV

Downloaded test data is CSV. Note the units: the machine records in finer units than the app displays, so the numbers here are larger than what you see on screen.

time_us,force_mN,position_nm,setpoint_nm
0,0,10000000,10000000
50000,114,10300000,10300000
...

Column	Unit	Meaning
time_us	µs	Timestamp
force_mN	mN	Measured force
position_nm	nm	Measured position
setpoint_nm	nm	Where the motion trajectory put the carriage at that moment (the Machine Setpoint readout)

The run viewer converts these to N and mm and derives stress/strain. Export CSV adds a metadata header (sample/motion details) to the CSV.

Saved vs. shared files

Inside your data folder, the app wraps each profile in a small record that tracks when it was created. The .sp / .mp files you import and export are just the plain profile shown above — which is what makes them easy to write by hand, email to a colleague, or keep in version control.