Data

.

(DAQ) .

A.

LabVIEW Data Acquisition National Instruments VI . DAQ A/D , D/A , I/O( /), / . LabVIEW DAQ VI DAQ . VI NI-DAQ .

(DAQ) .

DAQ . DAQ , Signal conditioning accessory conditioning . , , DAQ . DAQ , PCMCIA , remote .

Analog DAQ board Analog mode(single-ended differential ), resolution, range, sampling rate, accuracy, noise . Single-ended . (1V), DAQ (10 ft(3m) ), . , differential . GND potential , common-mode noise .

(DAQ) .

Range ADC . DAQ , ADC .

Resolution ADC .resolution , . 3Bit ADC sine . 3 23 8 . 000 111 . 16 bit resolution , ADC 8 65,536 (216) .

(DAQ) .

Gain . Gain , ADC division ADC . , 3-bit ADC 0~10V , 0 5 . gain 1, ADC 8 4 division . gain 2 , ADC 8 division . 0~5V , 2 5V ADC 10V .

(DAQ) .

DAQ board range, resolution, gain the smallest detectable change(V) . change 1 LSB code width . smallest detectable change /(gain*2resolution in bits) .

, 0~10V, gain=1 12-bit DAQ 2.4 mV , DAQ -10V~+10V 4.8mV .

Sampling rate A/D .Sampling rate , sampling rate . Analog sampling .

(DAQ) .

sampling sampling . (alias ).

Nyquist Sampling , 2 sampling . 20kHz. , 40 kHz sampling DAQ . Averaging. random noise noise . Noise .100 noise 1/10

(DAQ) .

B. LabVIEW Analog VI

DAQ , .Analog VI Easy (Easy AI) , Intermediate , Advanced , Utility . Analog , . .

(DAQ) .

Easy I/O Intermediate VI . Advanced VI NI-DAQ , Utility VI Intermediate VI .Easy I/O VI , , I/O counter/timer VI . DAQ, I/O, counter/timer LabVIEW DAQ . Easy I/O VI . VI DAQ , dialog box . Dialog box VI .Easy I/O VI , Intermediate VI , , .Intermediate VI external timing Easy I/O . VI VI

(DAQ) .

channel device 1 sample . High Limit Low Limit . , DAQ Gain .

channels 1 . samples . channels 0:7 0, 1, 2, 3, 4, 5, 6, 7 .

Easy VI . .

(DAQ) .

1 waveform( ) . waveform Number of samples waveform . waveform . . Sample rate . 1000 samples/sec 1000 .Actual sample period sample rate . sample rate 1000 samples/sec 1/1000 = 0.001 .

(DAQ) .

: number of samples = 100, sample rate = 100 number of samples 100. (one sample /sample rate) = 1/100 = 0.01 sec . actual sample period 0.01 . , 0.01 x 100 = 1 .

(DAQ) .

channel waveform . 2 . , .Number of samples/ch .Scan rate .

(DAQ) .

)

DAQ . , .

1. DAQ 1 . ( Referenced single-ended ).

2. .

AI Sample Channel.vi Analog Input . NI-DAQ utility device #1 , device device number .

(DAQ) .

3.Power ON VI .

, Easy VI . Device 0 .

4. .

.VI . .

5. Wait Until Next ms Multiple 1 1 .

, VI . LabVIEW VI . , VI OS ( , , ) . Tick Count , .

6.VI Voltmeter.vi VI .

(DAQ) .

) 1 Waveform Waveform

Easy VI VI .( CH1 sine )

.

# of Samples . Samples/Sec .

(DAQ) .

2. , , VI .

waveform . samples/sec # of samples . # of samples 1000 1000 . samples/sec (1/10,000) 0.0001 . , 1000 1000 samples /(10,000 samples/sec) = 0.1 sec X .

3.VI Waveform. vi .

(DAQ) .

(DAQ) .

(DAQ) .

(DAQ) .

C .

VI, DAQ . , waveform 2 . VI VI VI Easy VI, Intermediate VI, Advanced VI, Utility VI .

(DAQ) .

Easy VIDAQ . VI . VI , 1 . Easy VI VI . , DAQ , . , Utility VI VI .

voltage channel . .

(DAQ) .

channels voltages . .

waveform . waveform waveform . Update rate . VI .

waveform VI . waveform 2D 1 .

(DAQ) .

) sine

1. .

VI sine 200ms 1 0 . Intermediate VI .

2.VI Single Channel Analog Output. vi .

3. VI . Oscilloscope .

(DAQ) .

D. DAQ Channel Wizard

DAQ Channel Wizard . , LabVIEW Solution Wizard . , DAQ , .

lDAQ Channel Wizard DAQ , .DAQ Channel Wizard DAQ . National Instruments PCMCIA DAQCard-1200 . DAQCard-1200 8 , 2 , 24 I/O, 3 / .

(DAQ) .

) DAQ Wizard

1. Windows 95 LabVIEW N-DAQ DAQ Channel Wizard . LabVIEW project DAQ Wizards DAQ Channel Wizard... .

DAQCard-1200 0 IC . , 1 Sine , 2 0 .

(DAQ) .

DAQ Solution Wizard

DAQ Solution Wizard LabVIEW . LabVIEW VI . .DAQ Channel Wizard , DAQ Solution Wizard . 0 Temperature , IC .

1.LabVIEW LabVIEW Project DAQ Wizards DAQ Solution Wizard , 3 DAQ Solution Wizard Welcome to the DAQ Solution Wizard! . Go to Channel Wizard . ,

(DAQ) .

(DAQ) .

2.Solution Wizard Step 2 of 3 .

LabVIEW Solution Gallery Next> . .

Solution Gallery(Recommended) next LabVIEW VI . , Custom DAQ Application DAQ

(DAQ) .

3.Solution Wizard Step 3 of 3 . .

Gallery Categories Bench-Top Instrument Digital Multimeter . LabVIEW . Solution Wizard VI .

(DAQ) .

4. Digital Multimeter .

(DAQ) .

Open Solution

(DAQ) .

Arbitrary Waveform D/A , D/A Sine 2 Osc.

0(CHN0) sine , 0 1(CHN1) . 2 Sine LabVIEW Oscilloscope .

1.LabVIEW Step 3 of 3 Solution Wizard Gallery Categories Bench-Top Instrument 2 Channel Oscilloscope Next .

2. CHN0 CHN1 , Open Solution Oscilloscope .

2 Shift CHN0 CHN1 . Open Solution 2 Oscilloscope .

(DAQ) .

(DAQ) .

(DAQ) .

(DAQ) .

3.Back Step 3 of 3 Gallery Categories Bench-Top Instrument Arbitrary Waveform Generator .

(DAQ) .

4. 0 , Analog Output0 waveform , .Open Solution VI .

(DAQ) .

5. Arbitrary Waveform Generator. vi Run .

(DAQ) .

6. Create From Sketch . , 0 . DONE .

(DAQ) .

(DAQ) .

RSE(Referenced Sing mode) BNC cable .

(DAQ) .

E. .

. VI . VI . VI Easy I/O VI , Intermediate I/O VI Advanced I/O VI .

Easy I/O VI .Easy I/O VI immediate non-latched I/O. , Write to Digital Line HIGH LOW , VI .

(DAQ) .

. device DAQ device number port number . Line . Line state (T F)

. Port number . Pattern 10 , binary .

Easy I/O VI

(DAQ) .

HIGH LOW . Device DAQ device number. Port # . Line , line state , HIGH(TRUE) LOW(FALSE) .

. Port number . Pattern binary 10.

(DAQ) .

. HIGH , LOW .

(DAQ) .

DAQ 0( Port A) 0( DIO 0) VI.

iteration i VI iteration . While loop i = 0 , Read from Digital Line.vi . i > 0, VI . , FALSE , While loop VI .select Not TRUE , Selector TRUE ( ON ) While . While , VI(Begin Test A) .

(DAQ) .

DAQ I/O

DAQ port A 0, 1, 2, 3 LED ON/OFF VI . 4 LED DAQ DIO0~DIO3 . , LED .

1. .

Switch group Boolean . Number(binary) , Numeric Indicator - Show Radix .Operating radix - binary ( ) 2 .

(DAQ) .

2. .

3.On/off ON VI . While on/off TRUE switch group . switch group LED .

Boolean Array To Number(Boolean )

(DAQ) .

3-bit ADC

16-bit ADC

0 20 40 60 90 100 120 140

Time

Amplitude

10.00

9.75

7.50

6.25

5.00

3.75

2.50

1.25

0

111

110

101

100

011

010

001

000

mV

mV

gain

range

resolution

8

.

4

2

20

4

.

2

2

10

2

12

12

=

=

=

averaged

points

of

Number

1