Digital probe multimeter with Bluetooth and NFC. Free Technical Library News

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Digital multimeter with Bluetooth and NFC

23.10.2016

Texas Instruments has published a reference design for a measuring device made in the form of a probe probe with information transfer via Bluetooth Smart wireless channel.

The main functionality of the device is implemented on the wireless microcontroller CC2640, high measurement accuracy is provided by the 18-bit SAR ADC ADS8885 paired with a precision voltage reference REF3325. The multimeter has a scale of 4? discharge, while it calculates true RMS values (TrueRMS) with an accuracy of 0,05%.

The multimeter has a large set of service functions - automatic wake-up on touch (CapTIvate technology), binding to a smartphone using the NFC interface and precise control of the battery level using the Fuel Gauge mechanism.

Instrument capabilities:

Voltage measurement limits 50 V, 5 V, 500 mV and 50 mV
Current measurement limits 50 mA and 500 μA
ADC resolution 18-bit, 400 kSPS
Maximum value display 50
Resolution 1 µV / 10 nA
Accuracy 0,05% DC, 3% AC (at 100 kHz)

The multimeter is powered by a single lithium battery and is charged via USB. For the most economical battery consumption, the device uses a TPS62740 nanoconsumer converter, which is recommended for devices with a radio channel. The efficiency of the converter reaches 90% at a load current of only 10 μA.

The LabVIEW application is used as the operating interface, displaying the measurement results and information about the battery charge status.

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