DMM-BLE-2x01A “Mooshimeter” Technical Specifications:

Document History:

  1. 2013/12/27: Initial Release
  2. 2014/01/07: Moved accuracy note to beginning of document.  Corrected input impedance in high precision voltage.
  3. 2014/01/13: Added summary graphic at beginning of document.
  4. 2015/09/23: Removed note about calibration procedures.




  • 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