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. 

Figure 5-6.  Differential Input, Maximum Common Mode Voltage Requirement

5.3.5

Common Mode Voltage, Greater Than +/-10V   

The CIO-DAS1400 will not directly monitor signals with common mode voltages greater than +/-10V. You will either need to alter the
system ground configuration to reduce the overall common mode voltage, or add isolated signal conditioning between the source and
your board . See Figures 5-7 and 5-8.

Figure 5-7.  Common Mode Voltage Greater Than +/-10V, Differential Input

.

Figure 5-8.  Common Mode Voltage Greater Than +/-10V, Single-Ended Input w/Isolation Barrier

-10-

+

-

Inp ut

A m p

To A /D

A /D   B o a rd

I/O

C o nn ec tor

LL G N D

C H   H igh

C H   L ow

S ig n a

l  S o u

rce 

            

w ith  C

o m m

o n  

            

      M

o de  V

o ltag

e

S ign a l  s o u rc e   a n d   A /D   b o a rd 
w ith  c o m m on  m o d e  v o lta g e
c o n n e c te d to  a d iffe ren tia l in p u t.

G N D

T he   vo lta g e d iffe ren tia l
b e tw e e n   th e se   g ro u n d s ,
a d de d   to   th e   m a xim u m  
in p u t sig n a l m u st sta y 
w ith in  + /-10 V

 S ystem  w ith a Large C om m on  M ode  Voltag e,

C onne cte d  to  a  D ifferential   Inp ut

L

arge  c

om m o

n

      m

od e v

oltag e

 

         

    bet

w ee n

 signa

l 

         

          

sou rc

e  &   A

/D  bo

a rd

G N D

Iso latio n

B arrie r

W h en   the   v olta ge   diffe re nce
be tw e en   sig n al  s ource  a nd
A /D  boa rd g ro u nd  is la rg e
en o ug h  so the  A /D  b oa rd ’s
co m m on m od e ran ge  is
ex cee de d ,  isolate d  s ig nal
co nditio ning   m us t  be   a dd e d.

+

-

In p u t

A m p

To  A /D

A /D   B o a rd

I/O

C o n n e c to r

LL  G N D

C H     H ig h

C H     L ow

1 0   K

1 0 K  is  a  re c o m m e n d e d  v a lu e .  Yo u   m a y   s h o rt  L L   G N D  to   C H   L o w
in s te a d ,  b u t  th is   w ill    re d u c e   y o u r  s y s te m ’s  n o is e   im m u n ity.

  System  w ith  a Large C om m on M ode  Voltage ,

C onne cte d to a  Single-Ended Input

I/O

C o nn ector

+

-

Inp u t

A m p

To A /D

LL G N D

C H   IN

A /D   B o a rd

L

arge com

m on

      m

od e v

oltag e

 

         

    bet

w ee n

 signal

 

         

          

sou rce

 &   A /

D  boar

d

G N D

Iso latio n

B a rrie r

W h en  the  voltage   difference
betw e en  sign al  source a nd
A /D  boa rd  gro un d  is large
eno ugh so the A /D  bo ard ’s
com m o n  m od e  ra n ge  is
excee de d,  isolate d  sig nal
cond ition ing  m ust be  add ed.

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Содержание CIO-DAS1401/12

Страница 1: ...l service in house repair center WE BUY USED EQUIPMENT Sell your excess underutilized and idle used equipment We also offer credit for buy backs and trade ins www artisantg com WeBuyEquipment REMOTE INSPECTION Remotely inspect equipment before purchasing with our interactive website at www instraview com LOOKING FOR MORE INFORMATION Visit us on the web at www artisantg com for more information on ...

Страница 2: ... DAS1401 12 CIO DAS1402 12 CIO DAS1402 16 Data Acquisition Control Boards User s Manual Revision 7 November 2000 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...

Страница 3: ...oard model numbers the PCM prefix to data acquisition board model numbers PCM DAS08 PCM D24C3 PCM DAC02 PCM COM422 PCM COM485 PCM DMM PCM DAS16D 12 PCM DAS16S 12 PCM DAS16D 16 PCM DAS16S 16 PCI DAS6402 16 Universal Library InstaCal Harsh Environment Warranty and Measure ment Computing Corp are registered trademarks of Measurement Computing Corp IBM PC and PC AT are trademarks of International Busi...

Страница 4: ...ERS 12 6 1 INTRODUCTION 12 6 REGISTER ARCHITECTURE 11 5 3 7 Isolated Grounds Differential Inputs 11 5 3 6 Isolated Grounds Single Ended Inputs 10 5 3 5 Common Mode Voltage Greater Than 10V 9 5 3 4 Common Mode Voltage Less than 10V Differential Inputs 9 5 3 3 Common Mode Voltage Less Than 10V Single Ended Inputs 9 5 3 2 Common Ground Differential Inputs 8 5 3 1 Common Ground Single Ended Inputs 8 5...

Страница 5: ...This page is blank ii Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...

Страница 6: ...ion file that your application software and the Universal Library will refer to so the software you use will automatically know the exact configuration of the board Please refer to the Software Installation Manual regarding the installation and operation of InstaCalTM The following hard copy information is provided as a matter of completeness and will allow you to set the hardware configuration of...

Страница 7: ... ended input mode if you have more than eight low noise analog inputs to sample Using the differential input mode allows up to 10 volts of common mode noise rejection The CIO DAS1400 comes from the factory configured for 16 single ended inputs and the 8 16 switch is in the position shown in Figure 3 4 Set it for the type or number of inputs you require On the CIO DAS1402 16 this switch is located ...

Страница 8: ...3 6 Pacer Edge Select The CIO DAS1400 is shipped with the jumper in the rising leading edge position Figure 3 6 shows the edge selection options For compatibility with all third party packages with all DAS 16 software and with CIO DAS1400 software leave this jumper in the rising edge position 3 7 AUXILIARY TRIGGER There is a position for a header connector at the rear of the CIO DAS1400 This conne...

Страница 9: ... mating C37FF 2 cable Figure 4 1 CIO DAS1400 Analog Signal Connector 4 LLG ND 19 CH0 LO W CH 8 HIG H 18 CH1 LO W CH 9 HIG H 17 CH2 LO W CH 10 H IGH 16 CH3 LO W CH 11 HIG H 15 CH4 LO W CH 12 H IGH 14 CH5 LO W CH 13 H IGH 13 CH6 LO W CH 14 H IGH 12 CH7 LO W CH 15 H IGH 11 n c 10 n c 9 5V REF OUT 8 DIG GN D 7 DIG IN 1 6 DIG IN 3 5 DIG OU T 1 4 DIG OU T 3 3 CTR 0 O UT 2 5V PC BUS 1 37 CH0 HIGH 36 CH1 ...

Страница 10: ...s the CIO DAS1400 to monitor more channels than the 2 wire differential configuration using the same connector and onboard multiplexor However since the CIO DAS1400 is measuring the input voltage relative to its own low level ground single ended inputs are more susceptible to both EMI electro magnetic interference and any ground noise at the signal source Figure 5 1 shows the single ended input co...

Страница 11: ...ange is 10 Volts Even in differential mode no input signal can be measured if it is more than 10V from the board s low level ground LLGND Figure 5 3 Common Mode Voltage Range Values 6 Input A m p To A D Differential Input LL GND CH High CH Low Vs Vs Vcm Com m on M ode Voltage Vcm is ignored by differential input configuration However note that Vcm Vs must rem ain within the am plifier s comm on mo...

Страница 12: ...ents If you cannot obtain a reasonably stable DC voltage measurement between the grounds or the voltage drifts considerably the two grounds are most likely isolated To check for isolation change your voltmeter to a resistance scale and measure the resistance between the two grounds Turn both systems OFF prior to taking this resistance measurement If the measured resistance is more than 100 Kohm it...

Страница 13: ...solated ground system These signal sources are often battery powered Isolated ground systems provide excellent performance but require some extra care during connections to assure optimum performance is obtained Please refer to the following sections for further details 5 3 WIRING CONFIGURATIONS Combining all the grounding and input type possibilities provides us with the following potential conne...

Страница 14: ...cur and depending on the overall accuracy you require you may receive acceptable results 5 3 4 Common Mode Voltage Less than 10V Differential Inputs Systems with varying ground potentials should always be monitored in the differential mode Care is required to assure that the sum of the input signal and the ground differential referred to as the common mode voltage does not exceed the common mode r...

Страница 15: ...signal m ust stay within 10V System with a Large Common Mode Voltage Connected to a Differential Input Large common mode voltage between signal source A D board G ND Isolation Barrier When the voltage difference between signal source and A D board ground is large enough so the A D board s common mode range is exceeded isolated signal conditioning must be added Input Am p To A D A D Board I O Conne...

Страница 16: ...e recommend connections is this configuration Figure 5 10 Isolated Grounds Differential Input 11 Isolated Signal Source Connected to a Single Ended Input I O Connector Input Am p To A D LL GND CH IN A D Board Isolated signal source Input Am p To A D A D Board I O Connector LL GND CH High CH Low Signal Source and A D Board Already Isolated Already isolated signal source and A D board connected to a...

Страница 17: ...RAMMING Though uncommon some applications may not allow the use of our Universal Library and a high level package may not be available For this case a detailed register mapping for experienced programmers follows 6 2 CONTROL DATA REGISTERS The CIO DAS1400 is controlled and monitored by reading and writing 24 I O addresses The first address is referred to as the BASE ADDRESS BADR and is set by a ba...

Страница 18: ...annel MUX FIFO reset Channel MUX BASE 2 None A D Data Most significant byte BASE 1 Start A D Conversion A D Data Least significant four bits BASE WRITE FUNCTION READ FUNCTION ADDRESS 6 2 1 A D Data Channel Registers CIO DAS140 12 Base Address 0 CH0 CH1 CH2 CH3 A D 0 LSB A D 1 A D 2 A D 3 0 1 2 3 4 5 6 7 This register is read write READ On read it contains two types of data The least significant fo...

Страница 19: ...ficant four bits The low channel scan limit is in the least significant four bits WRITE The channel scan limits desired are written as one byte The high channel number scan limit is in the most significant four bits The low channel scan limit is in the least significant four bits NOTE Every write to this register sets the current A D channel MUX setting to the number in bits 0 3 and resets the FIF...

Страница 20: ... 8 differential INT 1 an interrupt has been received INT 0 ready to receive an interrupt An interrupt service routine must clear this bit after each interrupt CH3 CH2 CH1 CH0 are bits in a binary number between 0 and 15 indicating the MUX channel currently selected It is valid only when EOC 0 The channel MUX increments shortly after EOC 1 so may be in a state of transition when EOC 1 WRITE A write...

Страница 21: ...es number of conversions per trigger when in burst mode One to sixteen samples single ended or eight samples differential in a burst When the CIO DAS1400 is not in burst mode these bits have no function CTR0 1 When CTR0 1 an onboard 100KHz clock signal is ANDed with the COUNTER 0 CLOCK INPUT pin 21 A high on pin 21 will allow pulses from the onboard source into the 8254 Counter 0 input This input ...

Страница 22: ...t mode a rate fixed at the maximum possible is the best choice PROGRAMMABLE GAIN CONTROL Range and gain is controlled by bits G1 and G0 The codes have different meaning for each board in the DAS1400 family Table 6 4 Range Control Codes 0 1 25V 1 25V 3 0 2 5V 2 5V 2 0 5V 5V 1 0 10V 10V 0 CIO DAS1402 12 and CIO DAS1402 16 0 0 01V 0 01V 3 0 0 1V 0 1V 2 0 1V 1V 1 0 10V 10V 0 CIO DAS1401 12 UNIPOLAR RA...

Страница 23: ...on and loading reading of the counters The configuration of the 8254 codes which control the 8254 chip is explained in the Intel 8254 data sheet 6 2 10 Convert Disable Register BASE ADDRESS 404 hex T T T T T T T T 0 1 2 3 4 5 6 7 WRITE ONLY Writing a 0 to this register enables triggering of the A D converter if the DAS1400 mode is enabled On power up or reset this register is reset to conversion t...

Страница 24: ... common recalibrate at least every three months It takes less than 20 minutes to calibrate the CIO DAS1400 series board 7 1 REQUIRED EQUIPMENT Ideally you will need a precision voltage source or a non precision source and a 4 digit digital voltmeter 5 digit for the CIO DAS 1402 16 and a few pieces of wire You do not need an extender card to calibrate the board but you do need to remove the cover f...

Страница 25: ...nal varies between 0 and 20 volts and you wish to measure that with an analog input with a full scale range of 0 to 10 volts the attenuation is 2 1 or just 2 2 10K 10K 10K The variable Attenuation is the proportional difference between the signal voltage max and the full scale of the analog input Attenuation R1 R2 R2 Digital inputs often require the use of voltage dividers For example suppose you ...

Страница 26: ...term in a low pass filter circuit is cut off frequency The cut off frequency is that frequency above which no variation of voltage with respect to time can enter the board s input circuit For example if a low pass filter had a cut off frequency of 30 Hz the kind of interference associated with line voltage 60 Hz would be filtered out but a signal of 25 Hz would pass In a digital circuit a low pass...

Страница 27: ...able Interrupts 2 to 7 Interrupt enable Programmable Interrupt sources End of conversion terminal count DMA DMA Channel 1 or 3 Trigger sources External hardware software DIn0 A D conversion time 3 3 µs Throughput 160 kHz Differential Linearity error 1 LSB Integral Linearity error 1 LSB No missing codes guaranteed 12 bits Gain drift A D specs 30 ppm C Zero drift A D specs 10 ppm C Input leakage cur...

Страница 28: ...erature range 0 to 50 C Storage temperature range 20 to 70 C Humidity 0 to 90 non condensing Power Consumption 5 1 4A typical 2 1A max 9 2 CIO DAS1402 16 Analog Input Section A D converter type ADS7805 successive approximation Resolution 16 bits 1 in 65 536 Programmable ranges 10V 5V 2 5V 1 25V 0 to 10V 0 to 5V 0 to 2 5V 0 to 1 25V A D pacing Programmable external source Din0 positive edge or inte...

Страница 29: ... DIn2 Output Available at user connector CTR0 Out Counter 1 ADC Pacer Lower Divider Source 1 or 10 MHz oscillator jumper selectable Gate Tied to Counter 2 gate programmable source Output Chained to Counter 2 Clock Counter 2 ADC Pacer Upper Divider Source Counter 1 Output Gate Tied to Counter 1 gate programmable source Output ADC Pacer clock hard wired to user connector Ctr2 out Clock input frequen...

Страница 30: ...Essential requirements relating to electromagnetic compatibility EU 55022 Class B Limits and methods of measurements of radio interference characteristics of information technology equipment EN 50082 1 EC generic immunity requirements IEC 801 2 Electrostatic discharge requirements for industrial process measurement and control equipment IEC 801 3 Radiated electromagnetic field requirements for ind...

Страница 31: ... Commerce Boulevard Middleboro Massachusetts 02346 508 946 5100 Fax 508 946 9500 E mail info measurementcomputing com www measurementcomputing com Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...

Страница 32: ...l service in house repair center WE BUY USED EQUIPMENT Sell your excess underutilized and idle used equipment We also offer credit for buy backs and trade ins www artisantg com WeBuyEquipment REMOTE INSPECTION Remotely inspect equipment before purchasing with our interactive website at www instraview com LOOKING FOR MORE INFORMATION Visit us on the web at www artisantg com for more information on ...

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