Precision auto-ranging current meter (ammeter)
Here are some of the features of this instrument which sets it apart:
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Low noise zero-offset with 3-ranges (1mV output per nA/µA/mA)
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Low input burden voltage, high precision & bandwidth analog outputs
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Increased flexibility and usability with several input and output terminal options
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Fast auto-ranging capable
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Use standalone with a small OLED display or with a multimeter/oscilloscope
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Ultra fast range switching between any ranges (even nA to mA) without any glitching/bouncing of a mechanical switch
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Low Pass Filter mode – very useful to capture low noise signals on oscilloscopes
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Unidirectional mode – most used mode in measuring DC currents ranging from [0, 3.3A]
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Bidirectional mode – split supply biasing allows AC currents measurement ranging from [-1.65A, 1.65A]
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LiPo battery powered – long life and extended measurement range
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Auto-power-off
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Full digital control for power & range switching via touch pads
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OLED display option to read output with usable precision
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Datalogging possible via Bluetooth serial module or USB (use USB isolator, see guide)
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SAMD21 Cortex M0+ powered, change firmware to your needs
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Optional buzzer for audible feedback
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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
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Output offset voltage¹: typically <10µV, max 50µV
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Maximum input voltage differential (see Safety): 33mV
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Accuracy:
- +/-0.05% (µA, nA ranges)
- +/-0.1% (mA range)
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Highest resolution (nA range):
- 100pA (3.5digit meter)
- 10pA (4.5 digit meter)
- 1pA (5.5 digit meter)
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Cascaded MAX4239 amplifiers with 100x output gain
- Bandwidth: >300KHz (-3dB)
Sample no-load mA range comparison to µCurrent GOLD:
Sample measurement of a Moteino waking up and transmitting a RFM69 transceiver packet:
