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Specification
ED-549 Input Specification
The ED-549 provides eight analogue input channels, each of which is independently configurable as either a
differential voltage input or a current-sense input.
In voltage input mode, the input impedance is a minimum or 10MΩ. The full scale range can be configured as
±10V, ±5V, ±2.5V, ±1V, ±500mV, ±250mV, ±150mV or ±75mV using either an ASCII command or by selecting
the range on the web configuration pages.
In current input mode, a 115Ω sense resistor is used. The full scale range can be set to either ±20mA, 0-20mA
or 4-20mA.
Each channel has a jumper block that allows it to be individually set for either voltage input mode or current
input mode. The factory fitted configuration is that all 8 channels are set to voltage input mode. When the
jumper is across the left hand and central pins the channel has a high input impedance suitable for voltage
input ranges; when the jumper is across the right hand and central pins the channel has a 115Ω sense resistor
enabled suitable for current input ranges. In the picture AIn1 is set for current measurements, all other
channels are set for voltage measurements.
The device can make 12 measurements per second, divided between all the enabled inputs, and reports the
measurements with 16-bit resolution.
The allowed single-ended voltage of any analogue input pin is within ±11V of the AGND pins.
Measurement accuracy for the inputs on the device is within 0.1% of the full scale range at 25°C and 0.3% of
the full scale range over -30°C to +80°C. The common-mode rejection ratio (CMRR) of the analogue inputs is
over 120dB and the normal-mode rejection ratio (NMRR) of the inputs is greater than 100dB at both 50Hz and
60Hz.
Ethernet Analogue DIO
Product Manual V1.3
© Copyright Brainboxes Ltd
Page 17 of 100
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