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NI PXI-4220, User Manual

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Index

©

 National Instruments Corporation

I-3

NI PXI-4220 User Manual

O

operation of PXI-4220. 

See

 theory of 

operation

P

PFIs (programmable function inputs)

timing connections, B-1

posttriggered data acquisition

overview, B-2
typical acquisition (figure), B-2

potentiometers. 

See

 null potentiometers

pretriggered acquisition

overview, B-2
typical acquisition (figure), B-2

PXI-4220

block diagram, 4-19
calibration, 5-16
common questions, D-1
configuration settings, 3-2
specifications, A-1
taking measurements. 

See

 measurements

theory of operation

excitation, 4-21
null compensation, 4-26
shunt calibration, 4-27

Q

quarter-bridge configuration I, 2-4, 4-4
quarter-bridge configuration II, 2-6, 4-6
questions and answers, D-1

R

regulatory compliance specifications, A-9
remote sense, 2-12
removing NI PXI-4220

from Measurement & Automation 

Explorer (MAX), C-2

from PXI chassis, C-1

RTSI clocks, 4-33
RTSI triggers, signal connections, PXI 

(figure), 4-34

S

safety specifications, A-8
SCANCLK signal, DAQ timing 

connections, B-2

shunt calibration

questions about, D-1
theory of operation, 4-27

signal connections

timing connections

DAQ timing connections, B-2
programmable function input 

connections, B-1

SISOURCE signal, B-9
software

installation, 1-3
National Instruments ADE software, 1-3
NI-DAQ, 1-3
NI-DAQ version required, D-1

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Summary of Contents for PXI-4220

Page 1: ...erutilized and idle equipment along with credit for buybacks and trade ins Custom engineering so your equipment works exactly as you specify Critical and expedited services Leasing Rentals Demos In st...

Page 2: ...PXI NI PXI 4220 User Manual NI PXI 4220 User Manual May 2005 373530B 01 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com...

Page 3: ...ia 1800 887710 Mexico 01 800 010 0793 Netherlands 31 0 348 433 466 New Zealand 0800 553 322 Norway 47 0 66 90 76 60 Poland 48 22 3390150 Portugal 351 210 311 210 Russia 7 095 783 68 51 Singapore 1800...

Page 4: ...isuse or negligent acts and power failure or surges fire flood accident actions of third parties or other events outside reasonable control Copyright Under the copyright laws this publication may not...

Page 5: ...cautions to avoid electrical shock When symbol is marked on a product it denotes a component that may be hot Touching this component may result in bodily injury bold Bold text denotes items that you m...

Page 6: ...9 Full Bridge Type II 2 10 Full Bridge Type III 2 11 Remote Sense 2 12 Chapter 3 Configuring and Testing Verifying and Self Testing Using Device Test Panels 3 1 NI PXI 4220 Software Configurable Sett...

Page 7: ...e I 4 12 Full Bridge Type II 4 14 Full Bridge Type III 4 16 NI PXI 4220 Theory of Operation 4 18 Bridge Configuration and Completion 4 21 Excitation 4 21 Remote Sense 4 22 Gain Input Range 4 24 Filter...

Page 8: ...oping an Application Using LabVIEW 5 8 Using a DAQmx Channel Property Node in LabVIEW 5 10 Synchronization and Triggering 5 12 Synchronizing the NI PXI 4220 5 12 Synchronizing the NI PXI 4220 Using La...

Page 9: ...idge Type I Measuring Axial and Bending Strain 4 8 Figure 4 7 Half Bridge Type I Circuit Diagram 4 9 Figure 4 8 Half Bridge Type II Rejecting Axial and Measuring Bending Strain 4 10 Figure 4 9 Half Br...

Page 10: ...ignal Timing B 8 Figure B 11 AI SAMPLE CLK TIMEBASE Signal Timing B 9 Figure B 12 AI HOLD COMPLETE Signal Timing B 10 Figure C 1 Injector Ejector Handle Position Before Device Removal C 2 Tables Table...

Page 11: ...he NI DAQmx DAQ Assistant specifically the Strain Gage Calibration wizard to easily perform offset null compensation and shunt calibration The NI PXI 4220 is a two channel module for interfacing to Wh...

Page 12: ...up and use the NI PXI 4220 you need the following Hardware NI PXI 4220 device PXI chassis Sensors as required by your application Software NI DAQ 7 0 or later One of the following LabVIEW Measurement...

Page 13: ...includes LabVIEW Measurement Studio and LabWindows CVI After you set up the hardware system use either your application software documentation or the NI DAQmx documentation to help you write your appl...

Page 14: ...unpack install and configure the NI PXI 4220 in a PXI chassis LED Pattern Descriptions The following LEDs on the NI PXI 4220 front panel confirm the system is functioning properly The ACCESS LED is no...

Page 15: ...s well as full bridge sensors such as load force torque and pressure sensors It also discusses connecting leads for remote sensing Refer to Chapter 4 Theory of Operation for a discussion of strain gau...

Page 16: ...han 10 V can damage the device Figure 2 2 shows the pin signal assignments for each of the NI PXI 4220 D SUB connectors Refer to Figure 2 2 when constructing D SUB connection leads to ensure the signa...

Page 17: ...ompletion Pin 2 P0 Pin 3 RS0 Pin 6 S0 Pin 1 S0 Pin 7 P0 Pin 5 SCCOM Pin 4 QTR Shunt Cal A SCB0 Shunt Cal B Shunt Cal A Quarter Bridge Completion Pin 8 RS0 Pin 9 QTR Shunt Cal B A B R1 R2 Vex 2 Vex 2 C...

Page 18: ...it wiring diagram Refer to the Quarter Bridge Type I section of Chapter 4 Theory of Operation for more information Note If you have a two wire strain gauge element connect the active element leads to...

Page 19: ...This configuration uses the Shunt Cal A switch for shunt calibration Note The value of the quarter bridge completion resistor dummy resistor must equal the nominal resistance of the strain gauge NI re...

Page 20: ...ridge completion resistors R3 is the quarter bridge temperature sensing element dummy gauge R4 is the active element measuring tensile strain VEX is the excitation voltage RL is the lead resistance VC...

Page 21: ...Bridge Type I Circuit Diagram The following symbols apply to the circuit diagram and equations R1 and R2 are half bridge completion resistors R3 is an active element measuring compression from Poisson...

Page 22: ...e Type II Circuit Diagram The following symbols apply to the circuit diagram and equations R1 and R2 are half bridge completion resistors R3 is an active element measuring compressive strain R4 is an...

Page 23: ...gram The following symbols apply to the circuit diagram and equations R1 is an active element measuring compressive strain R2 is an active element measuring tensile strain R3 is an active element meas...

Page 24: ...symbols apply to the circuit diagram and equations R1 is an active element measuring compressive Poisson effect R2 is an active element measuring tensile Poisson effect R3 is an active element measur...

Page 25: ...Type III Circuit Diagram The following symbols apply to the circuit diagram and equations R1 is an active element measuring compressive Poisson effect R2 is an active element measuring tensile strain...

Page 26: ...and equations R1 R2 R3 and R4 are the transducer bridge elements VCH is the measured voltage VEX is the excitation voltage RL is the lead resistance VRSENSE is the measured bridge excitation Note Rem...

Page 27: ...nals properly The test panels allow you to measure the signal connected to the NI PXI 4220 directly as well as configure some of the properties of your measurement To open the NI PXI 4220 device test...

Page 28: ...n and Completion Bridge configuration is a software configurable setting that allows you to connect quarter half or full bridge sensors configurations Refer to Chapter 4 Theory of Operation for more i...

Page 29: ...should determine the appropriate gain using the input signal voltage range and the full scale limits of the NI PXI 4220 signal conditioning output signal Offset Null Compensation Potentiometers Coars...

Page 30: ...ations that might require SS H include vibration measurements and phase difference measurements You can disable this setting through your application if you require scan rates beyond the maximum allow...

Page 31: ...NI DAQmx Task or NI DAQmx Global Channel and functions in your application The default bridge configuration for NI DAQmx is full bridge Voltage Excitation set either through NI DAQmx Task or NI DAQmx...

Page 32: ...NI DAQmx Task or NI DAQmx Global Channel and click Next 4 Select Analog Input and then select Strain 5 If you are creating a task keep the Create New Local Channels selected and select the channels to...

Page 33: ...Reset Data to reset the values to default Click Calibrate to calibrate the strain channel s When you have completed calibrating the strain channel s click Finish Note For offset null compensation and...

Page 34: ...the auto zero mode and lowpass filter cutoff frequency 10 If you are applying custom scaling select Create New from the Custom Scaling drop down and follow the wizard instructions 11 If you are creati...

Page 35: ...11 Click the Start button 12 After you have completed verifying the channels click the Stop button You have now verified the NI PXI 4220 configuration and signal connection Note For more information a...

Page 36: ...agram Figure 4 1 Basic Wheatstone Bridge Circuit Diagram The Wheatstone bridge is the electrical equivalent of two parallel voltage divider circuits R1 and R2 compose one voltage divider circuit and R...

Page 37: ...upported strain gauge configuration types measure axial strain bending strain or both While you can use some similar configuration types to measure torsional strain NI software scaling does not suppor...

Page 38: ...ge VEX is the excitation voltage Vr is the voltage ratio that is used in the voltage to strain conversion equations and is defined by the following equation Software Scaling and Equations Once you hav...

Page 39: ...Type I Measuring Axial and Bending Strain A quarter bridge type I has the following characteristics A single active strain gauge element is mounted in the principle direction of axial or bending stra...

Page 40: ...n STC number that corresponds to the thermal expansion coefficient of the material under test STC gauges have a temperature sensitivity that counteracts the thermal expansion coefficient of the test s...

Page 41: ...gram Figure 4 4 Quarter Bridge Type II Measuring Axial and Bending Strain A quarter bridge type II has the following characteristics One active strain gauge element and one passive temperature sensing...

Page 42: ...in VEX is the excitation voltage RL is the lead resistance VCH is the voltage measured To convert voltage readings to strain units use the following equation where Rg is the nominal gauge resistance R...

Page 43: ...d resistance of 0 25 Half Bridge Type I This section provides information about the half bridge strain gauge configuration type I The half bridge type I measures either axial or bending strain Figure...

Page 44: ...element measuring compression from Poisson effect R4 is the active strain gauge element measuring tensile strain VEX is the excitation voltage RL is the lead resistance VCH is the voltage measured To...

Page 45: ...f the wiring if shunt calibration is performed or if lead length is very short 10 ft depending on the wire gauge For example 10 ft of 24 AWG copper wire has a lead resistance of 0 25 Half Bridge Type...

Page 46: ...rain gauge element measuring compressive strain R4 is the active strain gauge element measuring tensile strain VEX is the excitation voltage RL is the lead resistance VCH is the voltage measured To co...

Page 47: ...ot directly short SCA pin 4 or SCCOM pin 5 inside your connector unless the strain gauge leads are short and have minimal lead resistance You can neglect lead resistance RL of the wiring if shunt cali...

Page 48: ...emperature variation Compensates for lead resistance Sensitivity at 1000 is 2 0 mVout VEX input Figure 4 11 Full Bridge Type I Circuit Diagram The following symbols apply to the circuit diagram and eq...

Page 49: ...and the shunt calibration pins SCA pin 4 and SCCOM pin 5 Do not directly short SCA pin 4 or SCCOM pin 5 inside your connector unless the strain gauge leads are short and have minimal lead resistance F...

Page 50: ...ture variation Compensates for the aggregate effect on the principle strain measurement due to the Poisson s ratio of the specimen material Compensates for lead resistance Sensitivity at 1000 is 1 3 m...

Page 51: ...er corresponding to the material type of the test specimen As shown in Figure 2 9 Full Bridge Type II Circuit Diagram for greatest calibration accuracy use separate wires between the bridge and the sh...

Page 52: ...one side of the strain specimen top the other on the opposite side bottom Compensates for specimen temperature variation Rejects bending strain Compensates for the aggregate effect on the principle s...

Page 53: ...and R1 and R3 are positioned transverse to the beam axis and on opposite sides of the beam The nominal values of R1 R2 R3 and R4 equal Rg Gauges need not have an STC number corresponding to the materi...

Page 54: ...e EEPROM EEPROM ADC FIFO A D Converter AI Control IRQ DMA NI PGA Analog Mode Multiplexer Voltage Reference Calibration DACs Control Address Data PXI Connector RTSI Data Cal MUX Temperature Sensor Sign...

Page 55: ...m both channels You cannot enable or disable SS H on a per channel basis Disabling SS H results in higher maximum sample rates Disabling SS H introduces a small offset voltage You can compensate for t...

Page 56: ...ected to QTR SCBX pin 9 as shown in Figure 2 4 Quarter Bridge I Circuit Diagram Make sure that the value of the precision quarter bridge completion resistor exactly matches the nominal gauge resistanc...

Page 57: ...o chassis ground Note Chassis ground is at the same potential as earth ground when the PXI chassis is plugged into a standard 3 prong AC outlet If pin PX pin 7 is connected to earth ground the excitat...

Page 58: ...e set RL to zero in the MAX configuration of the channel and in your application equations for measured strain If you leave the remote sense pin unconnected internal 1 k resistors provide feedback to...

Page 59: ...the gain of the first stage is set to 20 so that the noise and offset drift of later stages is small in comparison to this stage The instrumentation amplifier stage uses operational amplifiers with ve...

Page 60: ...20 provides two filtering stages with an overall response of a four pole Butterworth filter You can control the cutoff frequency of the filter through software You can choose 10 Hz 100 Hz 1 kHz 10 kHz...

Page 61: ...ltage changes by a small amount due to changes such as temperature and sensor loading the correction signal produced by the potentiometers changes by the same amount and the offset null compensation i...

Page 62: ...r is then multiplied by each future measurement to obtain highly accurate measurements that are adjusted for any gain errors or discrepancies in the nominal gauge factor Refer to the Configurable Sett...

Page 63: ...hronized samples of all channels with negligible skew time between channels SS H signal conditioning is performed on the NI PXI 4220 with T H circuitry The outputs of the T H amplifiers follow their i...

Page 64: ...r most applications By default the NI PXI 4220 has SS H enabled You should only disable SS H if your application does not require simultaneous Hold Line Convert Clock 1 2 3 CH0 CH1 1 HoldTime 2 Max Mi...

Page 65: ...is preferable because it rejects not only common mode voltages and ground loop induced errors but also the noise picked up in the environment to a certain degree Common Mode Rejection Ratio The abili...

Page 66: ...cations such as internal hardware timing or multiple point acquisitions equivalent time sampling and seamless changing of the sampling rate The NI PXI 4220 uses the PXI trigger bus to easily synchroni...

Page 67: ...en timing signal Any timing signal can use the PFI0 pin as an input and multiple timing signals can simultaneously use the same PFI This flexible routing scheme reduces the need to change physical con...

Page 68: ...vice programmed to receive this timebase signal This clock source whether local or from the PXI trigger bus is used directly by the device as the primary frequency source The default configuration use...

Page 69: ...the timing signals available on the PXI trigger bus For more detailed timing signal information refer to Appendix B Timing Signal Information PXI Bus Connector Switch RTSI Switch PXI Trigger 7 PXI Tr...

Page 70: ...creates the reference point between the pretrigger samples and the posttrigger samples Input Input Output AI SAMP CLK Input Output This clock controls the time interval between samples Each time the...

Page 71: ...configure and use NI DAQmx to control the NI PXI 4220 in LabVIEW LabVIEW provides greater flexibility and access to more settings than MAX but you can use LabVIEW in conjunction with MAX to quickly cr...

Page 72: ...Task Using DAQ Assistant No Yes No Yes Configure Channels Further Configure Channels Start Measurement Read Measurement Clear Task Continue Sampling Stop Measurement Yes No Perform Offset Null Compen...

Page 73: ...or that requires complex scaling or when many properties differ between channels in the same task If you are using an ADE other than an NI ADE or if you want to explicitly create and configure a task...

Page 74: ...requested sample rate You also can select advanced features such as clock settings that specify an external clock source internal routing of the clock source or select the active edge of the clock si...

Page 75: ...o place the shunt calibration resistor across one arm of the bridge Analog Input General Properties Signal Conditioning Excitation Value AI Excit Val Specifies the amount of excitation in volts Analog...

Page 76: ...performed during Analog Input General Properties Signal Conditioning Bridge Initial Bridge Voltage AI Bridge InitialVoltage Specifies in volts the output voltage of the bridge in the unloaded conditio...

Page 77: ...ting for information about shunt calibration when in MAX To manually perform shunt calibration refer to the Shunt Calibration section of Chapter 4 Theory of Operation Acquiring Analyzing and Presentin...

Page 78: ...cation Using LabVIEW This section describes in more detail the steps shown in the typical program flowchart in Figure 5 1 such as how to create a task in LabVIEW and how to configure the channels of t...

Page 79: ...nfigured the channels in your task using the DAQ Assistant Any channel modifications made with a channel property node are not saved in the task in the DAQ Assistant they are only available for the pr...

Page 80: ...yze Data Some examples of data analysis include filtering scaling harmonic analysis or level checking Some data analysis tools are located on the Functions Signal Analysis subpalette and on the Functi...

Page 81: ...nge To and select Write Read or Default Value 8 After you have added the property to the property node right click the terminal to change the attributes of the property add a control constant or indic...

Page 82: ...master NI PXI 4220 exports the shared timing signals through the PXI bus to the slave devices Each NI PXI 4220 contains a DAQ STC chip and is capable of generating a hardware sample clock based on it...

Page 83: ...Task Create Slave Channels Set Slave to Use Timebase from Master Start Slave Measurement s Start Master Measurement Configure Master Channel Continue Sampling Yes No Clear Master Task Clear Slave Task...

Page 84: ...ge by default To change to a strain gauge channel click AI Voltage and select Analog Input Strain Strain Gage Configure Master Channels Use a DAQmx Channel Property Node Refer to the Using a DAQmx Cha...

Page 85: ...se Src and MasterTimebase Rate to the values retrieved from the master task in the Get Master Timebase Source and Rate from Master Task step Configure Slave Triggering DAQmx Trigger vi Start Digital E...

Page 86: ...high precision reference voltage NI driver software disconnects the channel inputs from the front signal connector and reconnects the inputs to ground or to an onboard reference when performing an in...

Page 87: ...rating the System You should perform offset null compensation or shunt calibration on transducers in your system to improve accuracy This is considered system or end to end calibration Offset Null Com...

Page 88: ...ngs X1 to X1000 with the following gain settings 1 1 15 1 3 1 5 1 8 2 2 2 2 4 2 7 3 1 3 6 4 2 5 6 6 5 7 5 8 7 10 11 5 13 15 18 20 22 24 27 31 36 42 56 65 75 87 100 115 130 150 180 200 220 240 270 310...

Page 89: ...V 180 0 mV 42 0 1 75 100 10 0 0300 5 00 265 V 100 0 mV 100 0 1 50 50 5 0 0 0300 5 00 155 V 50 0 mV 200 0 1 50 25 2 5 0 0300 5 00 103 V 18 0 mV 420 0 1 50 10 1 0 0 0300 5 00 69 V 10 0 mV 1000 0 1 50 10...

Page 90: ...missing codes 16 bits guaranteed Calibration Recommended warm up time 15 minutes External calibration interval 1 year Onboard calibration reference Level 5 000 V 1 mV actual value stored in EEPROM Tem...

Page 91: ...Hz filter 40 Vpp Noise RTI gain 200 0 1 to 10 Hz 1 5 Vpp Spot noise RTI gain 200 1000 Hz 16nV Filter Characteristics Lowpass filter type 4 pole Butterworth 24 dB octave rolloff Lowpass filter settings...

Page 92: ...resolution 80 000 microstrain null compensation range 4 microstrain resolution for quarter bridge GF 2 0 Excitation Type Constant voltage Settings 0 0 to 10 0 V in 1 024 equally spaced increments Erro...

Page 93: ...rt and stop trigger gate clock Source PFI0 TRIG1 front SMB connector PXI_Trig 0 5 PXI_Star PXI trigger bus 1 Half bridge completion is performed inside the module and configured under software control...

Page 94: ...le transfer demand transfer Configuration memory size 512 words Bus interface Master slave Power requirements 1 A at 5 VDC 5 Physical Dimensions not including connectors 16 0 10 0 2 0 cm 6 3 3 9 0 79...

Page 95: ...C 61010 1 EN 61010 1 UL 61010 1 CAN CSA C22 2 No 61010 1 Note For UL and other safety certifications refer to the product label or visit ni com certification search by model number or product line and...

Page 96: ...afety 73 23 EEC Electromagnetic Compatibility Directive EMC 89 336 EEC Note Refer to the Declaration of Conformity DoC for this product for any additional regulatory compliance information To obtain t...

Page 97: ...he device I O connector for applications requiring alternative wiring As an input each PFI signal can be individually configured for edge or level detection and polarity selection You can use the pola...

Page 98: ...typical posttriggered sequence Figure B 1 Typical Posttriggered Sequence Pretriggered DAQ allows you to view data that is acquired before the trigger of interest in addition to data acquired after th...

Page 99: ...triggered acquisitions Refer to Figures B 1 and B 2 for the relationship of AI START TRIG to the sequence As an output AI START TRIG reflects the action that initiates a sequence even if the acquisiti...

Page 100: ...scan counter SC indicates the minimum number of scans before AI REF TRIG is recognized After the SC decrements to zero it is loaded with the number of posttrigger scans to acquire while the acquisitio...

Page 101: ...ernally triggered AI CONV CLK As an output AI SAMP CLK reflects the actual start pulse that initiates a scan even if the starts are externally triggered by another PFI PXI_Trig 0 5 or PXI_Star You hav...

Page 102: ...hen the onboard SI2 counter reaches zero If you select an external AI CONV CLK the first external pulse after AI SAMP CLK generates a conversion Separate the AI SAMP CLK pulses by at least one scan pe...

Page 103: ...e as an output on PXI_Trig 0 5 Refer to Figures B 1 and B 2 for the relationship of AI CONV CLK to the sequence As an input AI CONV CLK is configured in edge detection mode You can configure the polar...

Page 104: ...gated by either the hardware AI PAUSE TRIG signal or the software command register gate AI PAUSE TRIG Signal PFI0 PXI_Trig 0 5 or PXI_Star can externally input the AI PAUSE TRIG signal which is not av...

Page 105: ...e source for AI SAMPLE CLK TIMEBASE in level detection mode Configure the polarity selection for the pin for either active high or active low The maximum allowed frequency is 20 MHz with a minimum pul...

Page 106: ...ing edge can clock external analog input multiplexers indicating when the input signal has been sampled and can be removed This signal has a 400 to 500 ns pulse width and is software enabled Figure B...

Page 107: ...ollowing steps while referring to Figure C 1 1 Power off the PXI chassis Do not remove the NI PXI 4220 device from a chassis that is powered on 2 Rotate the mounting screws that secure the NI PXI 4220...

Page 108: ...t of installed devices and interfaces The NI PXI 4220 should have a red circle with a white X inside it next to the device to indicate it has been physically removed from the chassis 2 Right click the...

Page 109: ...do I control the gain excitation voltage filter setting bridge configuration potentiometer settings and shunt calibration switches from LabVIEW The gain of each NI PXI 4220 channel is automatically se...

Page 110: ...voltage setting should I set on the NI PXI 4220 Even with an external voltage source for the transducers internal excitation voltage is still used by the offset null compensation circuitry inside the...

Page 111: ...giga 109 Symbols percent positive of or plus negative of or minus per degree ohm A A amperes A D analog to digital AC alternating current ADC analog to digital converter an electronic device often an...

Page 112: ...ignal range that includes both positive and negative values for example 5 to 5 V breakdown voltage the voltage high enough to cause breakdown of optical isolation semiconductors or dielectric material...

Page 113: ...nstrumentation amplifier inputs with respect to amplifier ground counter timer a circuit that counts external pulses or clock pulses timing CTR counter D D A digital to analog DAC digital to analog co...

Page 114: ...y on the bus while the processor does something else DMA is the fastest method of transferring data to from computer memory DNL differential nonlinearity a measure in least significant bit of the wors...

Page 115: ...om the ideal gain grounded measurement system See referenced single ended configuration H h hour Hz hertz the number of scans read or updates written per second I I O input output the transfer of data...

Page 116: ...CLK K k kilo the standard metric prefix for 1 000 or 103 used with units of measure such as volts hertz and meters kS 1 000 samples L LabVIEW Laboratory Virtual Instrument Engineering Workbench a pro...

Page 117: ...g measurement devices noise an undesirable electrical signal noise comes from external sources such as the AC power line motors generators transformers fluorescent lights soldering irons CRT displays...

Page 118: ...gle ended configuration RSE all measurements are made with respect to a common reference measurement system or ground also called a grounded measurement system relative accuracy a measure in LSB of th...

Page 119: ...up For example one pulse from the scan clock produces one scan which acquires one new sample from every analog input channel in the group scan clock the clock controlling the time interval between sca...

Page 120: ...lts VCC positive supply voltage VDC volts direct current VI virtual instrument 1 a combination of hardware and or software elements typically used with a PC that has the functionality of a classic sta...

Page 121: ...tions D 1 configuration settings excitation level 3 2 filter bandwidth 3 3 gain 3 3 4 24 null potentiometers 3 3 conventions used in the manual iv CONVERT signal See also PFI2 CONVERT signal DAQ timin...

Page 122: ...pattern descriptions 1 4 M Measurement Automation Explorer MAX removing NI PXI 4220 C 2 measurements calibrating PXI 4220 5 16 strain gauge connections full bridge configuration I 2 9 4 12 full bridg...

Page 123: ...4 27 Q quarter bridge configuration I 2 4 4 4 quarter bridge configuration II 2 6 4 6 questions and answers D 1 R regulatory compliance specifications A 9 remote sense 2 12 removing NI PXI 4220 from M...

Page 124: ...of operation block diagram 4 19 excitation 4 21 null compensation 4 26 shunt calibration 4 27 timing connections DAQ timing connections AIGATE signal B 8 CONVERT signal B 7 SCANCLK signal B 10 SISOUR...

Page 125: ...uipment Have surplus equipment taking up shelf space We ll give it a new home Learn more Visit us at artisantg com for more info on price quotes drivers technical specifications manuals and documentat...

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