(under construction)

Description

This 4¾-digit / 50000-count wireless digital multimeter device allows for measuring typical electrical signals. Using multiple of these devices in a network creates a multichannel distributed multimeter system.

The DMM connects via a WiCAN bridge device, and can do so together with over 100 other WiCAN sensor nodes. This solution enables for temporary or very dynamic measurements while staying compatible with the rest of a CANopen network. Or use the DMM to create a wireless data aquisition system from scratch.

Optional special cases allow for neat storage, transportation of a collection of WiCAN sensor devices. These cases contain integrated Qi chargers to allow for hassle-free charging of the devices.

WiCAN Digital MultiMeter

Functionality

  • Measure AC/DC volage, frequency & duty-cycle, resistance and capacitance
  • 50000 count resolution
  • True RMS converter
  • CANopen® fieldbus, generic I/O module profile CiA 401
  • Possibility for branding or custom firmware with specific behaviour

Network functions (via a CANopen gateway/master)

  • Stream measurements via JSON
  • View data directly via HTML, no cloud needed
  • Logging to micro-SD card
  • Node ID assigned via serial number
  • Configuration & firmware update

Note that this device also requires a receiver / CAN-bus bridge to bring the data back to the wired CAN-bus domain. Future versions of our gateway may include such receiver build-in.

Specifications

  • 4¾-Digit / 50000-count analog/digital converter
  • Voltage 100mV/1V/10V/100V/1000VAC/DC true RMS
  • Frequency max 99kHz + duty cycle 0-100%
  • Resistance 10Ω/100Ω/1kΩ/10kΩ/100kΩ/1MΩ/10MΩ
  • Capacitance 1nF/10nF/100nF/1µF/10µF/100µF
  • Autoranging or fixed range selected depending on SDO 0x6432 'ANALOGUE_INPUT_PRE_SCALING_INTEGER' value
  • Measurement type selected depending on SDO 0x6430 'ANALOGUE_INPUT_SI_UNIT' value
  • Update rate defaults to 1×/second, changes to synchronous/1 after first SYNC message. Also changeable via TPDO SYNC-type configuration, or to CiA-401-style event triggers
  • CAT III 600V and CAT II 1000V overvoltage protection
  • IEEE 802.15.4 protocol using XBee technology with integrated antenna
  • Globally approved 2.4GHz ISM band
  • Maximum wireless bandwidth ~100kbps
  • Distance 60m indoors, up to 1200m outdoors
  • CANopen® device profile for generic I/O modules (CiA 401)
  • CANopen SYNC-message PLL to reduce radio latency jitter effects
  • Supports LSS node ID assignment and Fastscan (CiA 305)
  • Supports firmware update via USB or wireless CAN interface, including firmware of the XBee radio module
  • Up-to-date EDS file generated by and downloadable from the device
  • Supports power management & monitoring features (CiA 302-9 + custom)
  • Li+ polymer battery 1800mAh / 6.7Wh
  • Qi wireless charging receiver
  • Internal micro-USB for alternative configuration and updates (not external because of isolation/safety concerns)
  • Enclosure 100x60x17mm
  • Integrated magnet makes device stick to Qi charger and to ferrous surfaces
  • ATEX intrinsic safety 'ic' (IEC 60079-11)

Plug & Play configuration

Plug&play operation

Out of the box, the device is configured to switch to OPERATIONAL state autonomously. The node-ID is programmed to 1 and one TPDO is configured for timer-based event trigger. This means the device can be used simply by listening to 'raw' CAN ID 0x281 to receive the periodic readings from the sensor. (Raw meaning without any CANopen stack or functionality on the receiving end.) Our out-of-the-box self-assiging node-ID feature allows to devices to learn the next free node-ID which it can use (this requires the devices to be connected one at a time to a powered network).

  • Self-assigning node ID, starting at 100
  • Automatic switch to NMT state OPERATIONAL
  • TPDO2 (CAN-ID 0x280+$NODEID) sends measurement value(s) every second or every SYNC (if faster)
  • All defaults can be changed using SDO or LSS configuration

CANopen

ATEX

Availability

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1 Continuous operating temperature -20° to +50°C, limited by the battery
'CANopen' is a registered trademark of CAN in Automation (CiA)
'XBee' is a registered trademark of Digi International Inc.