Introduction
Fig.4: EL3681Digital multimeter terminal
The EL3681 EtherCAT Terminal enables measurement of currents and voltages in wide input range. The measuring ranges are switched automatically, as usual in advanced digital multimeters. There are two current paths available for current measurement. One of them is a high current path for up to 10 A.
The current and the voltage measurement can be used for DC and AC. The alternating parameters are output as true RMS values. The input signal can cover a wide frequency range up to 1 kHz without affecting the measuring accuracy. A non-sinus signal form is allowed, if the Crest factor is < 3.
The measured values can be read and processed via EtherCAT. At the same time, the EL3681 enables the measuring mode and range to be set via the bus.
Excellent interference immunity is achieved through the fully electrically isolated design of the electronic measuring system and the dual slope conversion system. High accuracy and simple, high-resistance measurement from 300 mV to 300 V allow the EtherCAT Terminals to be used like a modern digital multimeter.
The selected measuring mode and overload are indicated by LEDs.
The expected voltage is often not yet known in the planning phase, particularly in measuring applications. Automatic adjustment of the measuring range simplifies use and reduces stock levels.
The EL3681-0030 variant is supplied with an external calibration certificate. Please read the notes on the calibration certificate and the identification features of these terminals.