Specs

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.

Summary

BasicMooshimeterAnatomy

Note on Provided Accuracies:

The accuracies and tolerances listed here are preliminary and conservative.  They do not include temperature compensation or factory calibration.

Expect these numbers to improve as we develop our calibration procedures.

Voltage

  • 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

Resistance

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

Frequency

  • Better than 1% accuracy up to 1kHz

Diodes

  • Up to 1V @ 100nA

Sampling

  • 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)

Radio:

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

Applications

Power

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

Impedance

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.

Temperature

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