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Table of Contents


The OP7818, designed for use with the OP7000 chassis, features 16 analog input channels. It is perfectly suited to interface simulator signals to real-life environment signals, providing electrical isolation.


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This board is not supported

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with the OP7000V2 chassis.



The board features:

  • 16 high impedance isolated input channels (differential impedance of 20 MOhms and single-ended impedance of 10 MOhms per channel),
  • a maximum voltage of up to 400V, configurable by jumpers,
  • selectable voltage, current or resistive sensor mode per channel.

Installation

The OP7818 analog input signal conditioning module must be inserted at the back of the OP7000 simulator in the odd-numbered slot corresponding to the front slot where the OP7220 is installed. See page OP7000V2: Adding or Replacing Boards for more details (the same applied for the OP7000 chassis).

Make sure that the board is properly aligned using the guide tracks before pressing into place.

Once installed, the faceplate provides a DB37F connector (see “connector pin assignments” for details) and a series of status LEDs. Each LED represents a channel (as shown in the table); if the LED is green, it indicates that the channel is in Voltage mode. If the LED is orange, the channel is in Current mode.

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Circuit Layout Diagram

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Board Layout 

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Configuration

Jumper and Switch Positions

Each channel has a series of jumpers and switches, seen in the figure below, that enables on-board onboard mode selection (voltage or current) and, subsequently, voltage range configurations. Each element enables a function that allows setting a very precise configuration for the OP7818 board.

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  • To obtain 100V, the SW2 screw must be in the +/-100V position and SW3 in the OFF position
  • To obtain 200V the SW2 screw must be in the +/-200Vposition and SW3 in the OFF position
  • To obtain 400V, the SW2 screw must be in the OFF position and SW3 in the +/-400V position
  • To obtain 600V the SW2 screw must be in the OFF position and SW3 in the +/-600V position

Optional Mezzanine Board

When working in low voltage mode, the Ain Resistive Sensor mezzanine can be used to take temperature measurements using either a thermistor or a resistive sensor.

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In Thermistor mode, the screw must be turned to the right, to THER.

Thermistor mode diagram

Installation

The OP7818 analog input signal conditioning module must be inserted at the back of the OP7000 simulator in the odd-numbered slot corresponding to the front slot where the OP7220 is installed. See page OP7000V2: Adding or Replacing Boards for more details (the same applied for the OP7000 chassis).

Make sure that the board is properly aligned using the guide tracks before pressing it into place.

Face Plate

The faceplate provides a DB37F connector (see “connector pin assignments” for details) and a series of status LEDs.

Each LED represents a channel, as shown in the table below. If the LED is green, it indicates that the channel is in Voltage mode. If the LED is orange, the channel is in Current mode.


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Anchor
db37f
db37f
DB37F Connector Pins Assignment

DB37

Connector

Channel

DB37

Connector

Channel


1

+IN00

20

-IN00

Pin Assignments

2

+IN01

21

-IN01

3

+IN02

22

-IN02

4

+IN03

23

-IN03

5

+IN04

24

-IN04

6

+IN05

25

-IN05

7

+IN06

26

-IN06

8

+IN07

27

-IN07

9

+IN08

28

-IN08

10

+IN09

29

-IN09

11

+IN10

30

-IN10

12

+IN11

31

-IN11

13

+IN12

32

-IN12

14

+IN13

33

-IN13

15

+IN14

34

-IN14

16

+IN15

35

-IN15

17


36


18


37


19

Specifications

Product name

OP7818

Part number

126-0391

Product type

OP7000 back 16 Ain

Number of channels

16

Input modes

Voltage,  current or resistive sensor

Isolation

Provided by OP7000

Maximum Current

±25 mA

Maximum voltage

±20 V

Dimensions

18.8 x 16.4 cm (7.4 in x 6.46 in)

I/O connector

DB37F

Operating temperature

10 to 40 ºC (50 to 104ºF)

Storage temperature

-55 to 85ºC (-67 to 185ºF)

Relative humidity

10 to 90%, non condensing

Maximum altitude

2,000 m (6562 ft.)