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© National Instruments Corporation

4-1

SC-2043-SG User Manual

Chapter 4
Theory of Operation

                                                                                                        

 

This chapter contains a functional overview of the SC-2043-SG board and explains the operation
of each functional unit making up the SC-2043-SG.

Functional Overview

The SC-2043-SG consists of eight channels, each comprising a bridge completion network, an
instrumentation amplifier with a gain of 10, offset nulling, filtering, and screw terminal
connections to accommodate strain gauge bridge measurements.  An onboard excitation voltage
source is provided, along with the option of user-supplied external excitation.  Additional
breakout screw terminals are also provided for signal termination of analog, digital, and timing
I/O lines on the DAQ board I/O connector.

The key functional components of the SC-2043-SG are:

•

Bridge completion network

•

Amplification

•

Offset nulling

•

Filtering

•

MIO and Lab/1200 I/O connectors and breakout screw terminals

•

Excitation voltage source

•

Power supply

The remainder of this chapter describes the theory of operation for each of these components.

Содержание SC-2043-SG

Страница 1: ...Copyright 1995 1996 National Instruments Corporation All Rights Reserved SC 2043 SG User Manual Eight Channel Strain Gauge Signal Conditioning Accessory August 1996 Edition Part Number 371201A 01...

Страница 2: ...elgium 02 757 00 20 Canada Ontario 519 622 9310 Canada Qu bec 514 694 8521 Denmark 45 76 26 00 Finland 90 527 2321 France 1 48 14 24 24 Germany 089 741 31 30 Hong Kong 2645 3186 Italy 02 48301892 Japa...

Страница 3: ...RECOVER DAMAGES CAUSED BY FAULT OR NEGLIGENCE ON THE PART OF NATIONAL INSTRUMENTS SHALL BE LIMITED TO THE AMOUNT THERETOFORE PAID BY THE CUSTOMER NATIONAL INSTRUMENTS WILL NOT BE LIABLE FOR DAMAGES RE...

Страница 4: ...or application designer Any use or application of National Instruments products for or involving medical or clinical treatment must be performed by properly trained and qualified medical personnel an...

Страница 5: ...Equipment 1 3 Unpacking 1 4 Chapter 2 Installation and Configuration 2 1 Installation 2 1 Board Configuration 2 1 Power Supply Selection 2 3 Onboard External Excitation Selection 2 4 Local Excitation...

Страница 6: ...plification 4 3 Offset Nulling 4 3 Filtering 4 4 I O Connectors and Breakout Screw Terminals 4 4 Excitation Voltage Source 4 4 Power Supply 4 4 Chapter 5 Calibration Procedures 5 1 Excitation Adjustme...

Страница 7: ...Jumpers 2 4 Table 2 4 Local Excitation Sense Jumper Settings for MIO and MIO E Series Boards 2 5 Table 2 5 Local Excitation Sense Jumper Settings for Lab 1200 Series Boards 2 6 Table 2 6 Half Bridge...

Страница 8: ...plains how to unpack your SC 2043 SG Chapter 2 Installation and Configuration describes the installation and configuration of your SC 2043 SG The topics discussed are connection of the SC 2043 SG to t...

Страница 9: ...ariables filenames and extensions and for statements and comments taken from program code Abbreviations acronyms metric prefixes mnemonics symbols and terms are listed in the Glossary National Instrum...

Страница 10: ...ons Related Documentation The following document contains information that you may find helpful as you read this manual Your DAQ hardware user manual Customer Communication National Instruments wants...

Страница 11: ...ed external excitation and is common to all channels The conditioned strain gauge signals are routed to eight single ended analog inputs on the DAQ board Note The NB MIO 16H and AT MIO 16H series boar...

Страница 12: ...ctions for using LabWindows CVI with National Instruments DAQ hardware is included with LabWindows CVI The LabWindows CVI Data Acquisition libraries are functionally equivalent to the NI DAQ software...

Страница 13: ...e register level software Writing register level programming software can be very time consuming and inefficient and is not recommended for most users Even if you are an experienced register level pro...

Страница 14: ...ake the following precautions Ground yourself via a grounding strap or by holding a grounded chassis such as a computer chassis Touch the antistatic package to a metal part of your computer chassis be...

Страница 15: ...nector 68 pin MIO E Series boards1 R6850 or SH6850 MIO J10 50 pin MIO boards2 NB1 MIO J10 100 pin MIO boards3 R1005050 MIO J10 Lab PC DAQPad 1200 NB1 Lab 1200 J9 DAQCard 1200 PR50 50F Lab 1200 J9 1 To...

Страница 16: ...5 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 26 10 12 13 1 Screen Printed Screw 14 Product Name and 27 R37 41 R53 Terminal Label Assembly Number 28 W12 42 R62 2 J1 15 SW1 29 R51 43 R6...

Страница 17: ...s 2 2 through 2 6 show the settings for the switch and jumpers Power Supply Selection Set switch SW1 to the INT position to draw power from the 5 V line on the DAQ board Set switch SW1 to the EXT posi...

Страница 18: ...xcitation source set both jumpers W1 and W3 to the EXT position and connect your excitation source to connector J7 Table 2 3 Onboard External Excitation Jumpers Jumpers Description Configuration W3 W1...

Страница 19: ...sing the stick on labels to ACH8 Setting jumper W2 to the EX position routes the excitation voltage to ACH0 leaving you ACH 1 7 for conditioned strain gauge signal inputs Setting jumper W2 to the CH0...

Страница 20: ...ition routes DAC1OUT pin 12 on the Lab 1200 connector to the screw terminal labeled 12 in the Lab 1200 column or DAC1OUT if you are using the stick on labels Setting jumper W2 to the EX position route...

Страница 21: ...tion disconnects the CHn screw terminal from the instrumentation amplifier and connects the half bridge completion network to the negative input of the instrumentation amplifier Table 2 6 shows the ju...

Страница 22: ...onfigure a channel for quarter bridge completion set the corresponding bridge completion jumper to the HB position and insert your quarter bridge completion resistor into the appropriate sockets The p...

Страница 23: ...arries the signals between the SC 2043 SG and an MIO or MIO E Series board You can use only one of these connectors to interface to a DAQ board at any time Figure 2 1 shows the position of these conne...

Страница 24: ...CH1 ACH1 6 ACH9 ACH9 7 ACH2 ACH2 8 ACH10 ACH10 9 ACH3 ACH3 10 ACH11 ACH11 11 ACH4 ACH4 12 ACH12 ACH12 13 ACH5 ACH5 14 ACH13 ACH13 15 ACH6 ACH6 16 ACH14 ACH14 17 ACH7 ACH7 18 ACH15 ACH15 19 AISENSE AIS...

Страница 25: ...42 GATE1 GPCTR1_GATE 43 OUT1 GPCTR1_OUT 44 UPDATE 45 GATE2 WFTRIG 46 OUT2 STARTSCAN 47 SOURCE5 GPCTR0_SOURCE 48 GATE5 GPCTR0_GATE 49 OUT5 GPCTR0_OUT 50 FOUT FREQ_OUT These signals are not routed to s...

Страница 26: ...Connector Pin Numbers Lab 1200 Connector Signal Names 1 ACH0 2 ACH1 3 ACH2 4 ACH3 5 ACH4 6 ACH5 7 ACH6 8 ACH7 9 AISENSE 10 DAC0OUT 11 AGND 12 DAC1OUT 13 DGND 14 PA0 15 PA1 16 PA2 17 PA3 18 PA4 19 PA5...

Страница 27: ...r analog inputs on channels ACH 8 15 AISENSE is directly connected to the excitation supply return and is earth grounded This makes AISENSE a low impedance reference therefore all signals referenced t...

Страница 28: ...timer I O signals of the DAQ board Refer to the Signal Connections chapter in your DAQ board user manual for pin descriptions Screw Terminal Description Screw terminal blocks J1 J6 shown in Figure 2 1...

Страница 29: ...up to the EX and EX terminals When the SC 2043 SG is configured for external excitation the EX inputs are routed directly to the EX 0 7 excitation output screw terminals Note The EX input signal is co...

Страница 30: ...FB HB CHn CHn EXn Full Bridge Figure 3 1 Full Bridge Connection to the SC 2043 SG Half Bridge Connection In this configuration only two strain gauges are used Bridge completion is provided by a half b...

Страница 31: ...wire end to the EXn screw terminal Figure 3 3 shows this configuration along with the appropriate quarter bridge completion resistor and half bridge jumper placement Half Bridge Completion Jumper Hal...

Страница 32: ...offset nulling circuitry for each channel by replacing its nulling resistor with a resistor of another value Therefore you can mix your ranges to accommodate each channel requirement Table 3 7 lists t...

Страница 33: ...O E Series board with 8 additional single ended analog input channels remember that your DAQ board will be configured for NRSE operation and all analog inputs are referenced to AISENSE pin 19 on the M...

Страница 34: ...nal connections to accommodate strain gauge bridge measurements An onboard excitation voltage source is provided along with the option of user supplied external excitation Additional breakout screw te...

Страница 35: ...Half Bridge Completion Jumper Half Bridge Completion Jumper Quarter Bridge Completion Resistor User Installed 15 V 5 V 5 V 5 V Gnd Local Excitation Sense Jumper Local Excitation Sense Jumper Unused An...

Страница 36: ...t differential input signals into single ended signals referred to the SC 2043 SG AISENSE node for input common mode signal rejection With this conversion the SC 2043 SG can extract the bridge input s...

Страница 37: ...y default onboard excitation source setting is 2 5 V Screw terminals on J7 can connect an external excitation source of up to 10 VDC to the SC 2043 SG Two jumpers select whether the onboard excitation...

Страница 38: ...levels on all channels If you want to readjust the onboard excitation voltage level to a different value you must perform the following steps 1 If you are using a rack mount kit remove the cover to ex...

Страница 39: ...re information 2 Configure the SC 2043 SG for external excitation so that your excitation source is connected to screw terminal block J7 Refer to Chapter 2 Installation and Configuration and Chapter 3...

Страница 40: ...stics Nonlinearity 0 01 FSR Gain error 0 15 of reading max Amplifier Characteristics Input impedance Normal powered on 10 G Powered off or overload 5 2 k Input bias current 2 5 nA Input offset current...

Страница 41: ...y 4 9 in I O connectors I O signals 72 labeled screw terminals DAQ board connector Two 50 pin ribbon cable connectors Environment Operating temperature 0 to 50 C Storage temperature 20 to 75 C Relativ...

Страница 42: ...y fax questions to us at any time Corporate Headquarters 512 795 8248 Technical support fax 800 328 2203 512 794 5678 Branch Offices Phone Number Fax Number Australia 03 9 879 9422 03 9 879 9179 Austr...

Страница 43: ...any National Instruments hardware or software products related to this problem include the configuration forms from their user manuals Include additional pages if necessary Name Company Address Fax Ph...

Страница 44: ..._______________________________________________ Other Products Computer Make and Model _________________________________________________ Microprocessor ________________________________________________...

Страница 45: ...ust 1996 Part Number 371201A 01 Please comment on the completeness clarity and organization of the manual If you find errors in the manual please record the page numbers and describe the errors Thank...

Страница 46: ...analog input sense signal AOGND analog output ground C Celsius CHn module positive or negative input channel number DAC digital to analog converter DAC OUT digital to analog converter output signal DA...

Страница 47: ...arts per million RAM random access memory RC resistance capacitance rms root mean square RTI referred to input s seconds SCANCLK scan clock signal ST screw terminal TCR temperature coefficient tempco...

Страница 48: ...3 8 illustration 3 8 quarter bridge connection 3 9 illustration 3 9 B block diagram of SC 2043 SG 4 2 board configuration See configuration bridge completion network 4 3 breakout screw terminals J1 J6...

Страница 49: ...res I input connectors signal summary table 3 4 input mode selection 2 7 installation 2 1 cabling options table 2 1 unpacking the SC 2043 SG 1 4 instrumentation amplifiers 4 3 J J9 Lab 1200 and J10 MI...

Страница 50: ...and J10 tables 3 2 and 3 4 offset nulling 3 9 4 3 adjustment 3 9 table 3 9 nulling range adjustment 3 10 table 3 10 other connection considerations 3 11 output connectors J9 and J10 signal summary tab...

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