Monday, June 17, 2024

Want a Mooshimeter Multimeter?

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mooshimeterThis is Mooshimeter. A wireless multimeter and data logger that outputs results to your smartphone.

Why would you want it? It lets you test and measure stuff from a distance — very useful for cases where the device under test is not the safest thing to be in touch with. The Mooshimeter comes with a rugged construction so that it too survives the experience.

In cases where you want to record and collect data for an extended period of time, the Mooshimeter also allows you to add a removable microSD card that can save data for up to six months!

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It features true 2-channel simultaneous sampling and a 600v 10A rating that allows for detailed diagnosis of AC systems. It allows you to evaluate harmonic distortion and power factor easily.



  • Up to 600V, DC or peak AC
  • Up to 420VAC RMS sinusoidal
  • Better than 0.5% accuracy DC
  • Better than 1.0% accuracy AC for harmonic content below 1kHz
  • >10 Megaohm input impedance

High Precision Voltage:

  • Up to 100mV with <15nV per count resolution
  • Up to 1.2V with <200nV per count resolution
  • >10 Megaohm input impedance

Current, Internal

  • Up to 10 Amps
  • 20 µV / mA burden voltage (using factory fuse)
  • Less than 5 µA per count in 10 Amp scale
  • Better than 1% accuracy


  • Better than 1% accuracy over 20 Ohms –  20 Megaohms


  • Better than 1% accuracy up to 1kHz


  • Up to 1V @ 100nA


  • 8kHz dual simultaneous sampling
  • 4kHz analog bandwidth for most measurements
  • 24-bit resolution max
  • >18 Effective bits at 125 samples per second

On Board Storage – SD Card

  • MicroSD Card
  • Up to 32GB
    • More than a week of constant logging two channels at 8kHz
  • SD or SDHC (not SDXC)


Protocol: Bluetooth Low Energy

GATT Profile: To be released in 2014

Wireless Range

The wireless range has been tested empirically through the following media to an iPhone 5.

  • 50m air, line of sight
  • 5cm of refrigerator, door closed
  • 1m of 2006 Honda Civic – Engine compartment to the passenger seat
  • 10m air + safety shield of a Tesla Coil rock-bands testing facility



Simultaneous high-speed sampling of voltage and current gives the following power measurements:

  • True Power
  • Reactive, Complex, Apparent Power
  • Power Factor
  • Total Harmonic Distortion
  • Phase Lead or Lag


Measure the supply sag under load to estimate:

  • Supply or Battery equivalent resistance
  • Battery State of Health

Current Measurement, External Shunt

  • Measure thousands of amps with sub-milliohm shunts
  • Measure precision currents with large shunts
  • Use the existing wiring for “quick’n’dirty” measurements
    • Use 1′ of 10AWG for 12µA per count resolution, up to several times the wires ampacity.


  • External Thermistors
    • Steinhart-Hart or Beta parameterized
  • External Thermocouples
  • Internal ambient temperature sensor
  • Internal temperature sensor for temperature drift compensation




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