Product Description; Introduction - Beckhoff EL3681 Documentation

Product description

2 Product description
2.1

Introduction

Fig. 4: EL3681
Digital 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 facility can be used for DC and AC. The alternating parameters
are output as true RMS values. The input signal can cover a range up to 1 kHz, without affecting the
measuring accuracy. A non-sinus signal form is allowed, if the Crest factor is < 3.
The measurement readings can be read and processed with EtherCAT. At the same time, the EL3681
enables the measuring type 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 precision and simple, high impedance
measurement from 300 mV to 300 V allow the EtherCAT terminals to be used like a modern digital
multimeter. The sample rate lies between approx. 500 ms if the filter is activated and approx. 62 ms if the
filter is deactivated.
The selected measuring type and overload are indicated by LEDs.
In measuring applications in particular, the voltage to be expected is often not yet known during the planning
phase. Automatic adjustment of the measurement range simplifies use and reduces stock levels.
As high-precision variants, the EL3681-0020 with individual factory calibration certificate and the EL3681-0030
with external calibration certificate are available.
Please read the notes on the calibration certificate [} 23] and identification features [} 23] of these
terminals.
EL3681 Version: 3.0 17