- A Teensy 4.1 based LCR meter
- measure capacitance, inductance, resistance and other complex parameters
- 4 wire measurement
- using an audio codec to measure voltage and current
- ILI9341 320x240 Touchscreen with user interface
- Basic accuracy of at least 1%
- There are four ranges: 100R, 1k, 10k, 100k. The range will be selected automatically according to the impedance of the DUT.
- Selectable test frequencies: 100 Hz to 90 kHz in 100 Hz steps.
- Selectable test levels: 300 mV, 600 mV, 1 V
The following complex parameter of the DUT can be measured (fixed combinations of them):
- Rs // equivalent series resistance (ESR)
- Rp // parallel resistance
- Cs // series capacitance
- Cp // parallel capacitance
- Ls // series inductance
- Lp // parallel inductance
- Phi // phase angle of impedance
- Xs // series reactance
- Z // impedance
- Q // quality factor
- D // dissipation factor
- G // conductance
- B // susceptance
Moving average of the readings can be set from 1 to 256.
Save screenshots to USB thump drive:
- A simple frequency generator for debug purpose
- Signal output at HCUR connector
- Waveforms: sinus only
- Frequency: 1Hz - 90kHz
- Amplitude: 1mVp - 2.4Vp
- Offset: 0 - 1V
- about 100R output impedance
- A simple voltmeter for debug purpose
- use HPOT and LPOT inputs
- Schematic
- analog frontend using an auto balancing impedance bridge
- 4 impedance ranges
- PGA for voltage and current signals
- Touchscreen, keypad and rotary encoder
- temperature sensor near codec to measure board temperature
- I2C eeprom to store calibration data and other settings
- Teensy Audio design:
- Phase calculation works exactly as described in TIDA-060029 LCR meter analog front end reference design.