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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



For a full description of the OP8900 series boards' FIU (fault insertion) unit, see here.


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:

ChannelR_AR_BR_CC_AC_B
1R9R3R75C5C1
2R23R21R108C18C12
3R12R4R67C7C2
4R26R24R107C19C13
5R37R35R144C27C20
6R53R51R173C34C30
7R43R36R137C28C21
8R55R52R170C35C33

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:


R_AR_BR_CC_AC_B
1R11R5R77C7C3
2R12R6R76C8C4
3R24R19R87C21C16
4R25R20R86C22C17
5R38R32R104C33C31
6R39R33R103C34C32
7R52R46R125C50C46
8R53R47R124C51C47

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.

Part NumberDescriptionInputOutputFIU
OP8931-F** REPLACED BY OP8934 *** 16 Aout differential from single-ended input with FIU SLSC Conditioning Board


Single-to diff

16 diff. FIU

OP8931-N** REPLACED BY OP8934 *** 16 Aout differential from single-ended input SLSC Conditioning Board


Single-to diff

N/A

OP8932-F16 Ain differential to single-ended with FIU SLSC Conditioning Board

Diff-to-Single


16 diff. FIU

OP8932-N16 Ain differential to single-ended SLSC Conditioning Board

Diff-to-Single


N/A

OP8933-F** REPLACED BY OP8935 *** 8 Ain/8 Aout with FIU SLSC Conditioning Board

Diff-to-Single

Single-to diff

16 diff. FIU

OP8933-N

** REPLACED BY OP8935 *** 8 Ain/8 Aout SLSC Conditioning Board

Diff-to-Single

Single-to diff

N/A

OP8934-F16 Aout differential from single-ended input with FIU SLSC Conditioning Board


Single-to diff

16 diff. FIU

OP8934-N16 Aout differential from single-ended input SLSC Conditioning Board


Single-to diff

N/A

OP8935-F8 Ain/8 Aout with FIU SLSC Conditioning Board

Diff-to-Single

Single-to diff

16 diff. FIU

OP8935-N8 Ain/8 Aout SLSC Conditioning Board

Diff-to-Single

Single-to diff

N/A


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