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Project Notes

#450 LCR45

Evaluating the Peak LCR45 inductance, capacitance and resistance meter.



The LCR45 is one of the leading test instruments from Peak Electronic Design in the UK.

The LCR45 is specialised for high resolution inductance, capacitance and resistance measurement. The main difference from the LCR40 is the 12 bit ADC and new software, resulting in greater range and resolution.


  • Fluid measurements of L, C and R (continuous readings with selectable hold function).
  • Fine resolution for improved performance at low inductance/capacitance/resistance.
  • Auto and Manual component type.
  • Auto and Manual test frequency.
  • Frequencies: DC, 1kHz, 15kHz and 200kHz.
  • Display of component values, complex impedance, complex admittance and magnitude/phase.

Key Specifications:

Parameter Min Typ Max
Resistatnce Range   2MΩ
Resistatnce Resolution 0.1Ω 0.2Ω  
Capacitance Range 0pF   10000µF
Capacitance Resolution 0.1pF 0.2pF  
Inductance Range 0H   10H
Inductance Resolution 0.1µH 0.2uH  

Measuring Complex Impedance

The LCR45 measures Complex Impedance spanning the full range of inductive, resistive and capacitive loads.

The main display will show Henries, Ohms or Farads as applicable, but the enter key switches the display to also show:

  • complex impedence
  • complex admittance (reciprocal of impedance)
  • magnitude and phase



The out-of-the box experience is excellent. It comes with a printed user manual (also available for download online, along with the datasheet), but it really does not need much instruction. The fact that it is a compact, portable and battery-powered is a bonus.

Peak provide an option for the unit to be supplied with a certificate of conformance, which provides a detailed calibration and manual verification report. I sprung for this option, as I lack any other calibrated LCR equipment.

One of the main applications I had for the unit was inductance measurement of hand-wound coils. I’ve no other equipment that can measure accurately down into the µH range.

So far, so good. An excellent piece of equipment to have on hand.

Credits and References

Project Source on GitHub Project Gallery Return to the LEAP Catalog

This page is a web-friendly rendering of my project notes shared in the LEAP GitHub repository.

LEAP is just my personal collection of projects. Two main themes have emerged in recent years, sometimes combined:

  • electronics - usually involving an Arduino or other microprocessor in one way or another. Some are full-blown projects, while many are trivial breadboard experiments, intended to learn and explore something interesting
  • scale modelling - I caught the bug after deciding to build a Harrier during covid to demonstrate an electronic jet engine simulation. Let the fun begin..
To be honest, I haven't quite figured out if these two interests belong in the same GitHub repo or not. But for now - they are all here!

Projects are often inspired by things found wild on the net, or ideas from the many great electronics and scale modelling podcasts and YouTube channels. Feel free to borrow liberally, and if you spot any issues do let me know (or send a PR!). See the individual projects for credits where due.