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Description

This board has 7 analogue inputs. Each of the inputs can be programmed for an input range of 10mV, 40mV, 200mV or 2V full scale. The inputs are bipolar, both positive and negative voltages can be measured. The inputs are differential, the common-mode rejection is better than 60dB (1000x).

Each of the channels is calibrated individually. The accuracy is 0.5%. The zero drift is compensated electronically and is neglectable over the temperature range.

The input signal is digitized with an integrating A-D converter. 50Hz noise is practically completely filtered. Pulse shaped noise on the input gives an error in the reading that is determined by the energy content of the pulse, not the amplitude. This results in very stable readings.

Each channel has a jumper that places a resistor of 100 Ohm 0.1%, parallel to the input terminals. This is used for 0...20mA or 4...20mA signals.

The board has 7 LED's. The LED's flash when a channel is read and the input voltage is more than 20% of full scale. After installation, the LED's must be switched off since they influence the boards accuracy.

Specifications

width

4 TE

power supply

+/-15Vdc,  < 40mA (LED's off)

input type

bipolar, differential

input range

10mV, 40mV, 200mV, 2V full scale

input impedance

500 kOhm (100 Ohm)

common-mode rejection

> 60dB (1000x)

common-mode voltage

max. 25V

jumpers

input resistance, board address

initial error

0.5% max.

temperature range operating

-10...+50°C

temperature range storage

-20...+70°C

temperature drift range

< 25 ppm / °C 

temperature drift zero

< 0.05% of full scale

resolution

20.000 counts (0.5µV, 2µV, 10µV, 100µV)

A/D converter

integrating, integration period 20ms

Connections

pin

signal

jumper settings

1

0V

2

0V

3

- channel 7

4

+ channel 7

5

- channel 6

6

+ channel 6

7

- channel 5

8

+ channel 5

option jumpers

9

- channel 4

10

+ channel 4

11

- channel 3

12

+ channel 3

13

- channel 2

14

+ channel 2

15

- channel 1

16

+ channel 1

 

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Last modified on: 23-11-2006