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Precision auto-ranging current meter (ammeter)

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CurrentRanger

Precision auto-ranging current meter (ammeter)

CurrentRanger

Quick Highlights

Here are some of the features of this instrument which sets it apart:

  • Low noise zero-offset with 3-ranges (1mV output per nA/µA/mA)

  • Low input burden voltage, high precision & bandwidth analog outputs

  • Increased flexibility and usability with several input and output terminal options

  • Fast auto-ranging capable

  • Use standalone with a small OLED display or with a multimeter/oscilloscope

  • Ultra fast range switching between any ranges (even nA to mA) without any glitching/bouncing of a mechanical switch

  • Low Pass Filter mode – very useful to capture low noise signals on oscilloscopes

  • Unidirectional mode – most used mode in measuring DC currents ranging from [0, 3.3A]

  • Bidirectional mode – split supply biasing allows AC currents measurement ranging from [-1.65A, 1.65A]

  • LiPo battery powered – long life and extended measurement range

  • Auto-power-off

  • Full digital control for power & range switching via touch pads

  • OLED display option to read output with usable precision

  • Datalogging possible via Bluetooth serial module or USB (use USB isolator, see guide)

  • SAMD21 Cortex M0+ powered, change firmware to your needs

  • Optional buzzer for audible feedback

  • Current ranges output:

    • 0-3300 nA/µA/mA (Unidirectional mode)
    • +/- 0-1650 nA/µA/mA (Bidirectional mode)
    • Burden voltage:
    • 17µV/mA
    • 10µV/µA
    • 10µV/nA
  • Output offset voltage¹: typically <10µV, max 50µV

  • Maximum input voltage differential (see Safety): 33mV

  • Accuracy:

    • +/-0.05% (µA, nA ranges)
    • +/-0.1% (mA range)
  • Highest resolution (nA range):

    • 100pA (3.5digit meter)
    • 10pA (4.5 digit meter)
    • 1pA (5.5 digit meter)
  • Cascaded MAX4239 amplifiers with 100x output gain

    • Bandwidth: >300KHz (-3dB)

CurrentRanger

Sample no-load mA range comparison to µCurrent GOLD: mA compare µCurrent

Sample measurement of a Moteino waking up and transmitting a RFM69 transceiver packet:

CurrentRanger

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