National Instruments 776570-00 User Manual Download

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Glossary

National Instruments Corporation

G-5

SCXI-1120/D User Manual

ONCE

Once bit

OUTREF

Output Reference signal

ppm

parts per million

RAM

random-access memory

Read bit

RESET*

Reset signal

rms

root mean square

RSC

rear signal connector

RSE

referenced single-ended (input)

RSVD

Reserved bit/signal

RTD

resistance temperature detector

RTEMP

Read Temperature bit

RTI

referred to input

RTO

referred to output

RTSI

Real-Time System Integration

SCANCLK

Scan Clock signal

SCANCLKEN

Scan Clock Enable bit

Summary of Contents for 776570-00

Page 1: ...120 D User Manual Eight Channel Isolated Analog Input Module and Eight Channel Wide Band Isolated Analog Input Module for Signal Conditioning SCXI 1120 D User Manual September 1999 Edition Part Number...

Page 2: ...1 48 14 24 24 Germany 089 741 31 30 Greece 30 1 42 96 427 Hong Kong 2645 3186 India 91805275406 Israel 03 6120092 Italy 02 413091 Japan 03 5472 2970 Korea 02 596 7456 Mexico D F 5 280 7625 Mexico Mont...

Page 3: ...ilures caused by owner s failure to follow the National Instruments installation operation or maintenance instructions owner s modification of the product owner s abuse misuse or negligent acts and po...

Page 4: ...tal Signal Connections 2 4 Using Jumpers W42 and W43 2 5 Using Jumper W44 on Revisions A and B of the SCXI 1120 2 6 Using Jumper W44 on Revision C of the SCXI 1120 and All Revisions of the SCXI 1120D...

Page 5: ...nt Requirements 5 1 Offset Null Adjust 5 1 Appendix A Specifications Appendix B Technical Support Resources Glossary Index Figures Figure 1 1 The Relationship between the Programming Environment NI DA...

Page 6: ...l 4 4 Figure 4 4 Analog Input Block Diagram 4 6 Figure 4 5 Analog Output Circuitry 4 9 Tables Table 2 1 Digital Signal Connections Jumper Settings 2 7 Table 2 2 Jumper W46 Settings 2 9 Table 2 3 Jumpe...

Page 7: ...signed for low cost signal conditioning of volt millivolt and current sources that require a 20 kHz bandwidth and where high common mode voltages exist Conventions The following conventions appear in...

Page 8: ...s Your DAQ hardware documentation This documentation has detailed information about the DAQ hardware that plugs into or is connected to your computer Use this documentation for hardware installation a...

Page 9: ...lel output mode with all eight input channels connected in parallel to eight DAQ device channels or in the multiplexed output mode with all eight channels multiplexed into a single DAQ device channel...

Page 10: ...g Detailed specifications of the SCXI 1120 D are listed in Appendix A Specifications What You Need to Get Started To set up and use your SCXI 1120 D you will need the following items SCXI 1120 or SCXI...

Page 11: ...ogramming Choices There are several options to choose from when programming your National Instruments plug in DAQ and SCXI hardware You can use LabVIEW LabWindows CVI NI DAQ ComponentWorks Measure Vir...

Page 12: ...irtualBench software will greatly reduce the development time for your data acquisition and control application NI DAQ Driver Software The NI DAQ driver software is included at no charge with all Nati...

Page 13: ...r kit SCXI modules and accessories for isolating amplifying exciting and multiplexing signals for relays and analog output With SCXI you can condition and acquire up to 3 072 channels For additional i...

Page 14: ...ser Manual 2 Configuration and Installation This chapter describes how to configure the SCXI 1120 D jumpers and how to install the SCXI 1120 D into the SCXI chassis Module Configuration The SCXI 1120...

Page 15: ...Null Adjust Potentiometers Output Null Adjust Potentiometers Product Name Assembly Number and Serial Number Front Connector Second Stage Filter Jumpers Second Stage Gain Jumpers First Stage Filter Ju...

Page 16: ...part number and is the letter found in that part number User configurable jumpers Jumper W43 carries the SCXIbus MISO line after buffering to the SERDATOUT signal on the rear signal connector On all...

Page 17: ...down 3 Remove the jumpers you want to change and replace them on the appropriate pins 4 Snap the top cover back in place 5 Replace the grounding screw to ensure proper shielding You must use software...

Page 18: ...ns A and B of the SCXI 1120 On Revision A and B SCXI 1120 modules jumper W42 is not used Set jumper W43 as explained in the cases above except in the case of a multichassis ribbon cable system In a mu...

Page 19: ...to the DAQ device Set jumper W42 to position 1 on only one of the SCXI 1120 D modules cabled to the DAQ device All the other SCXI 1120 D modules that are cabled to the DAQ device should have jumper W...

Page 20: ...ption Configuration W42 Position 1 Connects pullup to SERDATOUT factory default setting Applies only to SCXI 1120 Revisions C or later and all SCXI 1120D modules W42 Position 3 Parking position not co...

Page 21: ...rounding Shielding and Reference Mode Selection Jumper W46 Note The SCXI 1120 D will drive pins 4 6 8 10 12 14 16 and 18 on the rear signal connector although the SCXI 1120 D is in multiplexed mode W4...

Page 22: ...the analog reference to AOGND pins 1 and 2 of the rear signal connector Use with RSE DAQ devices Do not use with DIFF differential input DAQ devices AB R1 Connects SCXIbus guard to the analog referen...

Page 23: ...3 Jumper W41 Settings Description Configuration Position 1 Temperature sensor accessed in MTS mode factory default setting Position 3 Temperature sensor accessed in DTS mode DAQ device configured for...

Page 24: ...appropriate jumper on your module to the position indicated in Tables 2 3 and 2 4 Refer to Figure 2 1 for jumper locations on your module To determine the overall gain of a given channel on the SCXI 1...

Page 25: ...igher signal to noise ratio Furthermore two filter bandwidths are available 10 kHz and 4 Hz Second stage 1 A 2 B 5 C 10 D factory default setting for the SCXI 1120 20 E factory default setting for the...

Page 26: ...nel Two stage filtering eliminates the noise generated by the isolation amplifier producing a higher signal to noise ratio Furthermore two filter bandwidths are available 22 5 kHz and 4 5 kHz Your SCX...

Page 27: ...til the connectors make contact If you have already installed a cable assembly in the rear of the chassis the module and cable assembly must be firmly engaged however do not force the module into plac...

Page 28: ...r prior to removing covers or shields Equipment described in this document must be used in an Installation Category II environment per IEC 664 This category requires local level supply mains connected...

Page 29: ...the host computer and the SCXI device National Instruments is not liable for any damages or injuries resulting from incorrect signal connections If high voltages 30 Vrms and 42 4 Vpeak or 60 VDC are...

Page 30: ...for the SCXI 1120 D front connector Figure 3 1 SCXI 1120 D Front Connector Pin Assignments CHSGND 5 V RSVD CH7 CH6 CH5 CH4 CH3 CH2 CH1 NC NC NC NC NC CH0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 2...

Page 31: ...the rear signal connector MCH7 when the terminal block is configured for direct temperature connection and jumper W41 is in position 3 A4 5 V 5 VDC Source Powers temperature sensor on the terminal blo...

Page 32: ...ltage up to 250 Vrms For better noise immunity connect the negative input channel to the signal reference If the measured signals are floating connect the negative input channel to chassis ground on t...

Page 33: ...is solution although necessary in this case lowers the input impedance of the input channel amplifier and introduces an additional offset voltage proportional to the input bias current and to the resi...

Page 34: ...1120D you do not need to add the external resistor as the SCXI 1120D provides a DC path internally Refer to Figures 3 6 and 3 7 for further details Figure 3 6 AC Coupled Signal Connection for the SCX...

Page 35: ...able extender with the SCXI 1120 D you should read this section Figure 3 8 shows the pin assignments for the SCXI 1120 D rear signal connector Figure 3 8 SCXI 1120 D Rear Signal Connector Pin Assignme...

Page 36: ...4 33 DIG GND Digital Ground Supply the reference for DAQ device digital signals and are tied to the module digital ground 25 SERDATIN Serial Data In Taps into the SCXIbus MOSI line to provide serial i...

Page 37: ...factory default setting or in position AB R1 to avoid ground loops With DAQ devices that are configured for RSE measurements jumper W46 should be in position AB R0 to connect the SCXI 1120 D analog g...

Page 38: ...nP device respectively Table 3 3 lists the equivalencies For more information consult your cable assembly installation guide Specifications and ratings for the digital I O lines are given in Appendix...

Page 39: ...unit making up the SCXI 1120 D Functional Overview The block diagram in Figure 4 1 illustrates the key functional components of the SCXI 1120 D Figure 4 1 SCXI 1120 D Block Diagram Timing and Analog O...

Page 40: ...er channels with gains of 1 2 5 10 20 50 100 200 250 500 1 000 and 2 000 The SCXI 1120D consists of eight isolated amplifier channels with gains of 0 5 1 2 5 5 10 25 50 100 125 250 500 and 1 000 The S...

Page 41: ...a data acquisition section and an SCXIbus section The SCXI 1120 D connects to the SCXIbus through a 4 24 metral receptacle and to the DAQ device through a 50 pin ribbon cable header The digital inter...

Page 42: ...ptions All the control bits are fed into a latch before being routed to the rest of the module The channel select bits are taken directly from the shift register The Module ID Register contains the mo...

Page 43: ...og bus AB0 and a chassis ground CHSGND AB0 buses the SCXI 1120 D output to other modules or receives outputs from other modules through the SCXIbus The guard guards the analog bus and can be connected...

Page 44: ...hannel 1 Input Channel 2 Input Channel 3 Input Channel 4 Input Channel 5 Input Channel 6 Input Channel 7 To Output Stage To Output Stage To Output Stage To Output Stage To Output Stage To Output Stage...

Page 45: ...given gain stage use the following formula where BW is a given amplifier stage bandwidth GBWP is the gain bandwidth product typically 800 kHz for the SCXI 1120 and 8 MHz for the SCXI 1120D and G is t...

Page 46: ...mmon mode voltage or noise before being sampled and converted by the DAQ device The isolated amplifier also amplifies and conditions an input signal which results in an increase in measurement resolut...

Page 47: ...ts of a buffered output multiplexer and channel select hardware The channel select hardware consists of a counter This counter is needed when the module is operating in the multiplexed output mode Rea...

Page 48: ...e When the MCH0 signal is configured to be the output of channel 0 the rear connector simultaneously carries each of the outputs of the SCXI 1120 D on different pins and the module is in parallel mode...

Page 49: ...ch module sends its output to the SCXIbus during a scan You can specify this list to scan the modules in any order with an arbitrary number of channels for each module entry in the list However the ch...

Page 50: ...ital multimeter DMM Each channel on the SCXI 1120 D has two potentiometers dedicated for calibration One potentiometer is used to null the output offset the other is used to null the input offset Re c...

Page 51: ...amplifier gain to 1 000 10 Adjust the input potentiometer of the desired channel until the output is 0 6 mV 11 Go to the next channel You may seal the potentiometers after calibration with antisabotag...

Page 52: ...s 0 to 50 C SCXI 1120 Analog Input Gain jumper selectable 1 2 5 10 20 50 100 200 250 500 1 000 2 000 Output range 5 V Number of channels 8 Gain accuracy 0 2 of reading typ 0 6 of reading max Nonlinear...

Page 53: ...0 15 V s Noise 400 kHz bandwidth 1 Input gain 1 000 4 Hz filter 100 nVrms 10 kHz filter 4 Vrms Output gain 1 4 Hz 150 Vrms 10 kHz 1 mVrms Operating common mode voltage 50 or 60 Hz Channel to channel o...

Page 54: ...voltage 0 8 V max I I input current leakage 1 A max Digital output specifications referenced to DIG GND V OH output logic high voltage 3 7 V min at 4 mA max V OL output logic low voltage 0 4 V max at...

Page 55: ...1120 D User Manual A 4 www natinst com Safety Designed in accordance with IEC 61010 1 UL3111 1 and CAN CSA C22 2 No 1010 1 for electrical measuring and test equipment Approved at altitudes up to 2000...

Page 56: ...1329 or SCXI 1305 Maximum working voltage Signal CMV 250 Vrms Overvoltage protection 250 Vrms on or off Table A 1 Input Signal Range Gain Range Channel Bandwidth Filter at 22 5 K Filter at 4 5 K 0 5 1...

Page 57: ...eristics Input impedance Power on 1 M Power off and overvoltaged 500 k Input bias current 15 pA CMRR at DC1 110 dB CMRR at 50 or 60 Hz1 98 dB Output range 5 V Output impedance 100 in multiplexed mode...

Page 58: ...5 1 5 at 3 mVrms f 1 kHz G 1 000 Crosstalk 50 load and source 80 dB at 1 kHz Output selection time with V step all gains to 0 012 accuracy 3 s Filter Type Second order low pass RC filter Cutoff freque...

Page 59: ...c high voltage 3 7 V min at 4 mA max V OL output logic low voltage 0 4 V max at 4 mA max Physical Dimensions 3 1 by 17 3 by 20 3 cm 1 2 by 6 8 by 8 0 in Connectors 50 pin male ribbon cable rear connec...

Page 60: ...ons FAQs and their corresponding answers or solutions including special sections devoted to our newest products The database is updated daily in response to new customer experiences and feedback Troub...

Page 61: ...ite to provide information on local services You can access these Web sites from www natinst com worldwide If you have trouble connecting to our Web site please contact your local National Instruments...

Page 62: ...103 M mega 106 Numbers Symbols degrees ohms 5 V signal 5 VDC Source signal A A amperes AB0 Positive Analog Bus 0 signal AB0 Negative Analog Bus 0 signal AB0EN Analog Bus 0 Enable bit ACH data acquisit...

Page 63: ...bit CHS Chassis bit CHSGND Chassis Ground signal CJR cold junction reference CLKEN Clock Enable bit CLKOUTEN Scan Clock Output Enable bit CLKSELECT Scan Clock Select bit CNT Count bit D D A Data Addre...

Page 64: ...emperature sensor F F Fahrenheit FIFO first in first out FOUTEN Forced Output Enable bit FRT Forced Retransmit bit G GBWP gain bandwidth product GUARD Guard signal H hex hexadecimal HSCR Hardscan Cont...

Page 65: ...MCH Positive Analog Output Channel Number signal MCH Negative Analog Output Channel Number signal MIO multifunction I O MISO Master In Slave Out signal MOD Module Number bit MOSI Master Out Slave In...

Page 66: ...access memory RD Read bit RESET Reset signal rms root mean square RSC rear signal connector RSE referenced single ended input RSVD Reserved bit signal RTD resistance temperature detector RTEMP Read T...

Page 67: ...t s seconds SERCLK Serial Clock signal SERDATIN Serial Data In signal SERDATOUT Serial Data Out signal SL Slot bit SLOT0SEL Slot 0 Select signal SPI Serial Peripheral Interface SPICLK Serial Periphera...

Page 68: ...ments Corporation G 7 SCXI 1120 D User Manual VDC volts direct current VIH input logic high voltage VIL input logic low voltage VOH output logic high voltage VOL output logic low voltage Vrms volts ro...

Page 69: ...upled signalconnections figure 3 6 SCXI 1120D AC coupled signal connections figure 3 7 description 3 7 floating AC coupled signalconnections figure 3 7 SCXI 1120 D description 3 5 floating signal conn...

Page 70: ...description table 3 9 SCXIbus to SCXI 1120 D to DAQ device pin equivalencies table 3 11 diagnostic resources online B 1 DIG GND signal table 3 9 digital control circuitry 4 4 digital interface circuit...

Page 71: ...n 2 8 to 2 13 gain jumpers 2 10 to 2 12 jumper W41 direct temperature connection 2 10 jumper W46 grounding shielding and reference mode selection 2 8 to 2 9 SCXI 1120 filter jumpers 2 12 to 2 13 SCXI...

Page 72: ...state 4 2 requirements for getting started 1 2 revision letter location note 2 3 software programming choices 1 3 to 1 5 National Instruments application software 1 3 to 1 4 NI DAQ driver software 1 4...

Page 73: ...ation 4 1 to 4 11 analog and timing circuitry 4 5 to 4 11 analog input channels figure 4 6 analog output circuitry 4 9 to 4 11 formula for gain determination 4 7 block diagram of SCXI 1120 D 4 1 digit...

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