The OP8930 is a 16-channel analog input or output board with fault insertion, compatible with the NI SLSC-12001 Platform.

Features

• Analog signal conditioning & FIU on a single board
• 16 channel on two 8-channel OP8Gxx modules 
• Ain and Aout user-configurable conditioning circuit
• Fault insertions module FIU as an option

Board Architecture

The board features two groups of 8 channels and a set of relays adding fault insertion capability for each signal. 

The general layout of the board is as follows, with the Front Interface connectors on the left and the SLSC backplane connectors on the right: 

The input/output conditioning is managed by a combination of these two OP8Gxx (also called Type-G) modules: 

• OP8G01: 8-channel analog Input conditioning module
• OP8G03: 8-channel analog Output conditioning module

A CPLD is used to configure the fault insertion unit (FIU) section and the OP8G01 and OP8G03 modules.  It is responsible for the communication of the SLSC card within the NI environment for identification, error reporting, etc. It also receives configuration from the software and applies it to the FIU and to some of the I/Os.

The FIU specification and topology is common to all OP8900 boards.

Channels description

Analog Inputs

The OP8G01 module (P/N 126-0612) conditions ±10V or ±30V differential analog input signals coming from the unit under test into ±10V single-ended analog signals to be connected to the PXI chassis.

Special request to set other input voltage ranges (±60V).

Conditioning circuit configuration

The conditioning circuit is user-configurable by using passive components on through-hole sockets. Each channel is configurable independently. This feature allows adapting the module for: 

• Custom impedance matching
• Custom analog filter
• Custom analog divider

The configurable elements consist of a set of three resistors (R_A, R_B, R_C) and two capacitors (C_A, C_B) as shown below:

By default R_C, C_A and C_B are not installed, and R_A and R_B are 0 Ohm.

Use the table below to locate these elements on the board:

Analog Outputs

The OP8G03 module (P/N 126-0642) condition ±10V single-ended analog signals coming from the PXI chassis into ±20V differential analog output signals (OP8934/OP8935) or ±10V differential analog output signals (OP8931/OP8933) to be connected to the unit under test.

The maximum current per channel is ±50mA continuous, for a maximum of 250 mA per OP8930 board.

Conditioning circuit configuration

The conditioning circuit is user-configurable by using passive components on through-hole sockets. Each channel is configurable independently. This feature allows adapting the module for: 

• Custom impedance matching
• Custom analog filter
• Custom analog divider

The configurable elements consist of a set of three resistors (R_A, R_B, R_C) and two capacitors (C_A, C_B) as shown below:

By default C_A and C_B are not installed, and R_A, R_B and R_C are 10 Ohm.

Use the table below to locate these elements on the board:

OP8930 Configurations

Several assemblies of the OP8930 are available, as listed below, with different counts of inputs and outputs, and with or without the FIU section populated.