Physics / core
Physical instruments and measurement chains
Build an experimental measurement chain from sensors through conditioning and digitization, identifying bandwidth, noise, grounding, and calibration limits.
Your route through physics
Follow the path or begin with a question. Every lesson is open.
Your place, at your pace. Progress is optional and saved only in this browser when available.
Read / explore / reason
Inside this module
Module 01 core
Physical instruments and measurement chains
Build an experimental measurement chain from sensors through conditioning and digitization, identifying bandwidth, noise, grounding, and calibration limits.
- 01
Transducers and physical response functions
Define the measurand, sensitivity, and response time of a sensor before treating its electrical output as the physical quantity itself.
24 min - 02
Thermal, shot, and flicker noise
Calculate distinct noise mechanisms with explicit spectral and bandwidth conventions, and identify when independent-noise addition is justified.
24 min - 03
Noise spectral density and equivalent bandwidth
Integrate a noise spectrum through a declared filter and distinguish noise bandwidth from signal cutoff frequency.
24 min - 04
Impedance loading and signal conditioning
Calculate how an instrument changes a source voltage and how resistance, capacitance, and gain set the loaded measurement response.
24 min - 05
Operational amplifiers and feedback response
Use finite loop gain to calculate closed-loop accuracy and bandwidth, while checking stability and large-signal limits separately.
24 min - 06
Lock-in detection and phase-sensitive measurement
Derive two-quadrature demodulation with explicit amplitude and phase conventions, then connect output bandwidth to settling time.
24 min - 07
Sampling, aliasing, and antialias filters
Identify indistinguishable sampled frequencies and allocate analog filtering and clock performance before digitization.
24 min - 08
Analog-to-digital resolution and quantization
Separate converter step size from uncertainty, dynamic performance, and the assumptions that make quantization resemble white noise.
24 min - 09
Ground loops, shielding, and common-mode rejection
Follow unwanted currents and common-mode voltages through a connected measurement system instead of treating ground as an ideal universal node.
24 min - 10
Instrument calibration and end-to-end transfer functions
Turn a connected-chain indication into a calibrated result with a documented uncertainty model and a stated domain of validity.
24 min