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Indicated strain

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µε

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Vₒ/Vₑₓ

{{ roRatio }}

Σ±ε

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÷ k

{{ roBF }}

Strain field

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Drag a gauge along the beam or between faces. Orange = tension, blue = compression. The ends are axially restrained.

Load & temperature

Transverse load P (midspan)

{{ vP }}

Temperature change ΔT

{{ vdT }}

Axial restraint

{{ vK }}

0 % = free expansion · 100 % = fully restrained

Profile & material

L (mm)

h (mm)

I (10⁶mm⁴)

E (MPa)

α (µε/°C)

Beam theory

{{ r.name }} · x={{ r.x }} mm

M {{ r.M }} kNm

topp {{ r.top }}
bunn {{ r.bot }}
aks {{ r.th }}

Bridge setup — case

Wheatstone bridge

Output Vₒ

{{ roVo }} mV

Vₒ/Vₑₓ

{{ roRatio }} mV/V

Bridge factor k

{{ roBF }}×

Perfect STC

{{ roAna }} µε

Final indicated strain

{{ heroEps }} µε

Excitation Vₑₓ

{{ vVex }}

Lead length (m)

Ω/m per conductor

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Error sources

Sun/shade R₁ vs R₃

{{ vResGrad }}

Resistor tempco (ppm/°C)

εmek {{ g.eMech }}
εtemp {{ g.eTO }}
R {{ g.R }}Ω

Face

x (mm)

Direction

Bridge arm

Dummy (unloaded)

R₀ (Ω)

STC α (µε/°C)

Sensor

Noise density (µg/√Hz)

Offset bias (mg)

Bias drift (mg RMS)

Scale-factor error (%)

Range (±g)

ADC (bit)

Bandwidth (Hz)

Sample rate (Hz)

Noise spec band

The density above is only valid inside this band. Outside it the model uses typical behaviour, which you can adjust.

Valid from (Hz)

Valid to (Hz)

Low-f rise (dB/decade)

Low-f cap (×)

Above band (× density)

Low-frequency response & phase error

Phase error = atan(1/ωτ). Data sheets rarely state it, but the amplitude error at two low frequencies pins τ.

Gain error (dB)

at frequency (Hz)

Gain error (%)

at frequency (Hz)

Time constant τ (s)

{{ tauNote }}

Group time delay (ms)

Constant phase offset (°)

Sets offset bias, bias drift and scale-factor error to 0 — noise and frequency response are left untouched.

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Noise density

          -- sensor— at output
        

Sensor response

          — gain-- phase
        

Motion at the sensor location

Specify amplitude as

Amplitude ({{ ampUnit }})

Frequency (Hz)

Std σ (m/s²)

Lower frequency (Hz)

Upper frequency (Hz)

Natural frequency fₙ (Hz)

Damping ζ (–)

High-pass for integration (Hz)

Random seed

Acceleration — input vs. readout

          ■ true■ measured
        

Displacement — input vs. double-integrated

          ■ true■ estimated
        

Spectrum (acceleration)

Deviation: input vs. readout

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