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DI–720/DI–722/DI–730 Series User Manual

Accessories

43

Two signal measurement conditions govern your configuration of a differential channel input: The signal to be mea-
sured is ground-referenced; or the signal to be measured is isolated from ground.

Ground-referenced Signal Sources

—A ground-referenced signal source is one with a local ground that may not be 

(and probably is not) at the same potential as the computer's ground. This potential difference between signal ground 
and computer ground is referred to as a common mode voltage and is caused by a number of different factors.

The most common of these is different physical locations of the computer and signal ground points. Since wire is not 
a perfect conductor (exhibiting zero resistance regardless of length) a voltage drop, however small, will always be 
present. The differential amplifier is unique in its ability to measure signals originating from sources with different 
ground potentials relative to the computer 

provided it is connected properly

.

V

Signal 

Source

Computer 

Ground

Ground Potential Difference

(Common Mode Voltage)

+

Signal

Source

Differential

Amplifier

-

gnd

Signal

Lead

Shield

Ground loop caused by circulating currents.

DI-205 terminal strip

WRONG APPROACH

Circulating currents in signal shield 

induce noise on signal of interest.

Содержание DI-725/E

Страница 1: ...slated into any human or computer language in any form or by any means electronic mechanical magnetic optical chemical manual or otherwise without expressed written authorization from the com pany The...

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Страница 3: ...products that have been repaired or altered by persons other than DATAQ Instru ments employees or products that have been subjected to misuse neglect improper installation or accident DATAQ Instrument...

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Страница 5: ...et RS 232 Serial or Parallel Printer Port 3 Apply power to your data acquisition device your PC and the device under test 4 Use a digital voltmeter to make the following measurements a Measure the vol...

Страница 6: ......

Страница 7: ...nstrument to your PC or Network 17 Installing WinDaq software for Ethernet Products 18 Daisy Chaining Multiple Ethernet Products 19 TCP IP Manager Ethernet Models Only 20 WinDaq Waveform Navigator Eth...

Страница 8: ...54 Installing DI 8B Modules 54 Enabling CJC for Thermocouple Modules 56 Configuring DI 78B Channels in WinDaq 56 DI 720 Host Instruments 57 DI 730 Host Instruments 58 Configuring DI 78B Channel Gain...

Страница 9: ...Input Modules 80 DI 5B34 Linearized 2 or 3 Wire RTD Input Modules 81 DI 5B35 Linearized 4 Wire RTD Input Modules 83 DI 5B36 Potentiometer Input Modules 85 DI 5B38 Strain Gage Input Modules Narrow Wid...

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Страница 11: ...ge differential inputs 20V Full Scale DI 730 Series Instruments offer 8 fixed isolated high voltage range 1000V Full Scale differential inputs and 16 general purpose 10V Full Scale non isolated inputs...

Страница 12: ...tage range differential inputs General purpose inputs feature software programmable input measurement ranges of 10V 5V 2 5V and 1 25V full scale with gain ranges of 1 2 4 and 8 Analog Output On DI 720...

Страница 13: ...software selectable per channel DI 722 16 Series 24 differential 16 single ended software selectable on channels 17 32 DI 722 32 Series 32 differential DI 730 Series 8 isolated fixed differential plus...

Страница 14: ...rror 1 bit max 1kHz sample rate Input offset voltage 1 bit max 1kHz sample rate Input settling time 4 s to 0 01 at all gains Input impedance DI 720 1 M resistor tied to GND on the input channel DI 722...

Страница 15: ...000 USB products Pre trigger points Post trigger points the number of enabled channels must be less than or equal to 15 000 Trigger channel Any channel Trigger level hysteresis 8 bit 256 counts On boa...

Страница 16: ...DI 720 DI 722 DI 730 Series User Manual Specifications 6 Power DI 720 4 5 Watts DI 722 10 Watts DI 730 14 Watts...

Страница 17: ...d on the sleeve of your CD ROM This password will give you access to that software If you did not order WINDAQ Pro or WINDAQ Pro recording software the WINDAQ Lite recording soft ware will be availabl...

Страница 18: ...the other end of this cable to your computer s parallel printer port Note the LPT port number to which you connected your device LPT1 LPT2 etc 3 Set up your computer s Printer Port operating mode The...

Страница 19: ...t do you want to do dialog box select the Install Software radio button and click OK c In the Installing Software dialog box select the Install Software for all other products radio button and click O...

Страница 20: ...anced CODAS q Installation is complete Re start your PC to enable WINDAQ device drivers for the printer port 6 Run WinDaq software from the program group designated in Step 5n above default is Start P...

Страница 21: ...ed in The WINDAQ Resource CD a Insert the The WINDAQ Resource CD into your CD ROM drive The Windows auto run feature should start the installation program If the Windows auto run feature is not enable...

Страница 22: ...1 the third device installed should have an ID address of 2 etc Click OK to continue installation n The Installation Option dialog box allows you to specify access to WINDAQ for multiple users on the...

Страница 23: ...to change the IP address of your network card Installation of an Ethernet device via a hub switch containing ONLY DI 720 722 730 785 788 products also requires you to change the IP address of your ne...

Страница 24: ...n the This connection uses the following items window and click on the Properties button 5 Click on the General tab 6 Select the radio button Use the following IP address 7 Enter 169 254 0 1 in the sp...

Страница 25: ...lving IP addresses Installing an Ethernet device via a distributed network without a DHCP server where one or more DATAQ Instruments devices will coexist with other Ethernet devices and where static I...

Страница 26: ...7 Select the Change IP Address drop down command 8 Select the Set a static IP Address radio button 9 Enter the IP address provided by your system administrator in Step 1 above Do not check the Remote...

Страница 27: ...stall WINDAQ software see Installing WinDaq software for Ethernet Products on page 18 2 Connect your Ethernet device to your Local Area Network see Connecting your Ethernet Instrument to your PC or Ne...

Страница 28: ...lick OK 4 In the Specify the product dialog box you must choose the version of WINDAQ you would like to install If you purchased WINDAQ Pro or Pro software select the appropriate option and click OK I...

Страница 29: ...lation 17 The Installation Option dialog box allows you to specify access to WINDAQ for multiple users on the same PC If you are the only user or you would like to allow access to all users click Yes...

Страница 30: ...independently opened using WINDAQ Playback Software WINDAQ Waveform Browser TCP IP Manager Ethernet Models Only The TCP IP Manager allows you to easily manage all DI 720 DI 722 and DI 730 Ethernet Ins...

Страница 31: ...d devices with the following exceptions The Open and Record menu items in the File Menu are not available The Triggered Mode Triggered Storage and Remote Storage menu items in the Options Menu are not...

Страница 32: ......

Страница 33: ...nalog output accessible through WINDAQ and SDK software and two analog grounds labeled AGD Note When using your DI 720 USB as a printer port device Digital Output ports DO1 DO2 and DO3 are unavail abl...

Страница 34: ...and the channel number For example say we have channels 2 and 10 configured as a differen tial input Channel 2 is the positive input channel 10 is the negative input and the pair is referred to as ch...

Страница 35: ...DI 722 Series instrument The analog inputs are labeled CH1 CH1 through CH16 CH16 for the DI 722 16 and CH1 CH1 through CH32 CH32 for the DI 722 32 The analog grounds are labeled AGD Read CAUTION on pa...

Страница 36: ...red channel in the pair assuming the positive input and the channel number For example say we have channels 18 and 26 configured as a differential input Channel 18 is the positive input channel 26 is...

Страница 37: ...channel to channel and input to output isolation protects delicate control circuits computer equipment and personnel from high common mode voltages Use the EXPANSION USB and PP devices or Channel Exp...

Страница 38: ...the USB control ler is enabled POWER This indicator glows green when power is applied to the DI 720 DI 722 or DI 730 Series instrument POWER INPUT JACK Allows you to apply power to the instrument Pow...

Страница 39: ...the DI 78B DI 75B DI 725 or DI 725B expansion instrument Use the following diagram for pinout 1 5 V P W R 3 R e s e r v e d 5 R e s e r v e d 7 R e s e r v e d 9 R e s e r v e d 1 1 R S t a r t S t o...

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Страница 41: ...x 0 1 10mV So we would need a DVM with a resolution of 10V or more to calibrate the 10 volt range A stable voltage source with a stability specification equal to or greater than the minimum DVM resolu...

Страница 42: ...n prompts DI 720 Series Instruments And 16 DI 730 General Purpose Channels DI 722 and DI 730 Series 8 Wide Range Channels accessi ble from the front panel Channels should be measured in isolation and...

Страница 43: ...es described in TABLE 1 arrange to have your instrument recali brated by DATAQ Instruments Full Scale Span Calibration Verification DI 720 and DI 722 Instruments Only 1 Referring again to TABLE 1 set...

Страница 44: ...h 4 6 If any readings are out of the acceptable ranges described in TABLE 2 arrange to have your instrument recali brated by DATAQ Instruments Full Scale Span Calibration Verification DI 730 Instrumen...

Страница 45: ...DI 720 DI 722 DI 730 Series User Manual Block Diagram 35 6 Block Diagram DI 720 Series 1 32...

Страница 46: ...DI 720 DI 722 DI 730 Series User Manual Block Diagram 36 DI 722 Series...

Страница 47: ...DI 720 DI 722 DI 730 Series User Manual Block Diagram 37 DI 730 Series Analog Input I S O L A T I O N...

Страница 48: ...In 10 100 BaseT RX TX RX TX Sync Out Sync In Clock Out RX TX Interrupt Synchronous Clock Synced ADC Clock Command Status Data Address Link RJ45 Toward PC RJ45 Expansion Sync Start Encoder Decoder PLL...

Страница 49: ...Bandwidth 66 DI 8B42 2 Wire Transmitter Interface Modules 67 DI 8B45 Frequency Input Modules 68 DI 8B47 Linearized Thermocouple Input Modules 69 DI 8B50 51 Analog Voltage Input Modules 20kHz Bandwidt...

Страница 50: ...ector which allows you to connect our BNC cable model num ber CABL 4 or our 5B back plane cable model number CABLE 1 or any 37 pin DAS 16 compatible cable to the DI 720 while still allowing screw term...

Страница 51: ...of the DI 205 Analog Output DAC1 DAC2 VOUT The digital to analog converter DAC outputs have two applications As a general purpose analog output accessible through WINDAQ or Programmer s SDK software o...

Страница 52: ...source as follows Connecting a Differential Amplifier A differential channel configuration is a special case approach to signal measurement that should be used with all low level measurements less th...

Страница 53: ...y a number of different factors The most common of these is different physical locations of the computer and signal ground points Since wire is not a perfect conductor exhibiting zero resistance regar...

Страница 54: ...ssible but the value you use is dependent upon the output impedance of your signal source Generally the value of the bias resistor should be 10 times the output impedance of your signal source or high...

Страница 55: ...lications where such signal cable is used a dramatic decrease in noise pickup will be experienced The drain wire should be considered as the shield and should be connected as described in the Connecti...

Страница 56: ...erential inputs to the host s 8 wide measurement range inputs for a diverse blend of 40 total channels A maximum of 240 channels may be configured using multiple DI 725s Connecting the DI 725 to the H...

Страница 57: ...osition indicating power is applied POWER LOW lamp Glows red when the DI 725 cannot derive adequate power from its host instrument In this case an alternate power source is required If the POWER LOW l...

Страница 58: ...presents an input channel An input channel is enabled by clicking the desired box Which box you click which mouse button you click with and how many times you click the mouse button deter mines whethe...

Страница 59: ...ost DI 400 and the expansion channels are enabled on the next MUX row down The result is similar when more DI 725 s are added to the system When a Single DI 725 is Used These 14 channels are still ava...

Страница 60: ...ost DI 720 and the expansion channels are enabled on the next MUX row down The result is similar when more DI 725 s are added to the system When a Single DI 725 is Used These 30 channels are still ava...

Страница 61: ...st numbered channels on the host DI 730 and the expansion channels are enabled on the next MUX row down The result is similar when more DI 725 s are added to the system When a Single DI 725 is Used Th...

Страница 62: ...The included expansion signal cable and the dual ended power cable are sized to fit when the DI 78B is stacked on top of or under the host instrument If the instruments are not in a stacked configurat...

Страница 63: ...provides connections for power and expansion in DI 78B Front Panel The four 16 port screw terminals on the front of the DI 78B are used to interface analog input channels 1 through 16 channels 17 thro...

Страница 64: ...y of the power supply is 2 5A Power switch Controls power to the DI 78B 1 position is on 0 is off Installing DI 8B Modules DI 78B instruments accept up to 16 signal conditioned analog inputs All DI 8B...

Страница 65: ...eted backplane The DI 8B modules can be mixed or matched in any combination suit able for the application and are identical in pinout and size so it doesn t matter which module gets plugged into which...

Страница 66: ...Each jumper is labelled on the circuit board as TC CH where is the channel number Sixteen jumpers are provided with the DI 78B for this purpose Note If you are not using a Thermocouple Input Module on...

Страница 67: ...the channels that are still available on the host DI 720 instrument when the DI 78B is added These channels can be enabled as single ended or differential the same as before the DI 78B was added Chann...

Страница 68: ...ed by clicking once with the left mouse button The isolated differential inputs on the front panel of the DI 730 are still available Configuring DI 78B Channel Gain you MUST configure gain for proper...

Страница 69: ...olts 3 Click the Next or Previous command button at the bottom of the dialog box to step to the next or previously enabled channel Note that when either the Next or Previous button is activated the ch...

Страница 70: ...or anti aliasing and the other two are on the system side A special input circuit on the DI 8B30 and DI 8B31 modules provides protection against accidental connection of power line voltages up to 240V...

Страница 71: ...and frequency response which provides 70dB of normal mode rejection at 60Hz One pole of this filter is on the field side of the isolation barrier for anti aliasing and the other two are on the system...

Страница 72: ...ith a three pole filter optimized for time and frequency response which provides 70dB of normal mode rejection at 60Hz One pole of this filter is on the field side of the isolation barrier for anti al...

Страница 73: ...itation current does not flow in the input signal leads which allows RTD measurements to be made independent of lead resistance The excitation cur rents are small 0 25mA which minimizes self heating o...

Страница 74: ...the self heating of the potentiometer Signal filtering is accomplished with a three pole filter optimized for time and frequency response which provides 70dB of normal mode rejection at 60Hz One pole...

Страница 75: ...side of the isolation barrier for anti aliasing and the other four are on the system side A special input circuit on the DI 8B38 module provides protection against accidental connection of power line...

Страница 76: ...the system side A special input circuit on the DI 8B40 and DI 8B41 modules provides protection against accidental connection of power line voltages up to 240VAC Clamp Circuits on the I O and power ter...

Страница 77: ...ponse which provides 60dB per decade of normal mode rejection above 100Hz One pole of this filter is on the field side of the isolation barrier for anti aliasing and the other two are on the system si...

Страница 78: ...nsors The excitation is available on the EXC terminal with return on the terminal A special input circuit on the DI 8B45 modules provides protection against accidental connection of power line volt ag...

Страница 79: ...r is on the field side of the isolation barrier for anti aliasing and the other two are on the system side A special input circuit on the DI 8B47 module provides protection against accidental connecti...

Страница 80: ...the system side A special input circuit on the DI 8B50 and DI 8B51 modules provides protection against accidental connection of power line voltages up to 240VAC Clamp circuits on the I O and power te...

Страница 81: ...e host instrument through the supplied dual ended power cable Connecting the DI 75B to the Host Instrument NOTE The included expansion signal cable and the dual ended power cable are sized to fit when...

Страница 82: ...ot to overtighten the two screws DI 5B modules are installed on or removed from a socketed backplane and are secured to the backplane with a non removable mounting screw Each channel position is label...

Страница 83: ...ong the bottom row Note that this screw terminal block can be removed from the DI 75B thus making signal connections to the screw terminals easy Note also that the screw terminal block is keyed thus d...

Страница 84: ...m part number 100454 25R POWER status lamp Glows green when the POWER switch is in the 1 position indicating power is applied to the DI 75B POWER LOW lamp Glows red when the DI 75B cannot derive adequ...

Страница 85: ...75B is connected Channels 17 to 24 channels 1 to 8 on the DI 75B are defined by DI 5B modules and are enabled by clicking once with the left mouse button Note that if a DI 5B module is not plugged int...

Страница 86: ...s connected Channels 17 to 24 channels 1 to 8 on the DI 75B are defined by DI 5B modules and are enabled by clicking once with the left mouse button Note that if a DI 5B module is not plugged into a s...

Страница 87: ...WINDAQ Pro recording software 2 In the Edit menu click on Channel Settings The Channel X Settings dialog box where X represents the cur rently enabled channel displays 3 In the upper left corner of t...

Страница 88: ...he Read Enable pin to I O Common pin 19 Signal filtering is accomplished with a six pole filter which provides 95dB of normal mode rejection at 60Hz and 90dB at 50Hz Two poles of this filter are on th...

Страница 89: ...by simply connecting pin 22 the Read Enable pin to I O Common pin 19 A precision 20 current conversion resistor is supplied with the DI 5B32 module see block diagram for installation details Signal f...

Страница 90: ...connecting pin 22 the Read Enable pin to I O Common pin 19 The field voltage or current input signal is processed through a pre amplifier and RMS converter on the field side of the isolation barrier...

Страница 91: ...ble pin to I O Common pin 19 RTD excitation is provided from the module by two matched current sources When using a three wire RTD this method allows an equal current to flow in each RTD lead which ca...

Страница 92: ...C 392 F 0 C 32 F to 600 C 1112 F 0V to 5V 0V to 5V 0V to 5V 0V to 5V 0 46 C 0 36 C 0 46 C 0 88 C 10 Cu 0 004274 DI 5B34C 01 DI 5B34C 02 DI 5B34C 03 0 C 32 F to 120 C 248 F 10 at 0 C 0 C 32 F to 120 C...

Страница 93: ...required between I O Common and Power Common for proper operation of the output switch If desired the output switch can be turned on continuously by simply connecting pin 22 the Read Enable pin to I...

Страница 94: ...C 392 F 0 C 32 F to 600 C 1112 F 0V to 5V 0V to 5V 0V to 5V 0V to 5V 0 46 C 0 36 C 0 46 C 0 88 C 10 Cu 0 004274 DI 5B35C 01 DI 5B35C 02DI 5B35C 03 0 C 32 F to 120 C 248 F 10 at 0 C 0 C 32 F to 120 C...

Страница 95: ...ovided from the module by two matched current sources When using a three wire potentiometer this method allows cancellation of the effects of lead resistances The excitation currents are very small le...

Страница 96: ...istors to 1mV at 10V excitation allows use of low cost half or quarter bridge trans ducers On wide bandwidth modules the 10kHz bandwidth allows measurement of high speed processes such as vibration an...

Страница 97: ...10k 10 0V at 3mV V Sensitivity 5V to 5V DI 5B38 33 or DI 5B38 03 Half Bridge 100 to 10k 3 333V at 3mV V Sensitivity 5V to 5V DI 5B38 34 or DI 5B38 04 Half Bridge 300 to 10k 10 0V at 3mV V Sensitivity...

Страница 98: ...ng pin 22 the Read Enable pin to I O Common pin 19 The input signal is processed through a preamplifier on the field side of the isolation barrier This preamplifier has a gain bandwidth product of 5MH...

Страница 99: ...oom computer The voltage output is logic switch controlled which allows these modules to share a common analog bus without the requirement of external multiplexers The DI 5B modules are designed with...

Страница 100: ...sducers and other devices which require a precision 10VDC sup ply and produce a high level output The 1kHz bandwidth significantly reduces ripple and noise inherent in these devices Transducer excitat...

Страница 101: ...ON DI 5B43 01 1V 10 0Vdc 40mA DI 5B43 02A 2V 10 0Vdc 40mA DI 5B43 03 3V 10 0Vdc 40mA DI 5B43 04A 4V 10 0Vdc 40mA DI 5B43 05 5V 10 0Vdc 40mA DI 5B43 06 6V 10 0Vdc 40mA DI 5B43 07A 7V 10 0Vdc 40mA DI 5B...

Страница 102: ...rator A 5 1V excitation is available for use with magnetic pickup or contact closure type sensors The excitation is avail able on pin 1 EXC and the excitation common is pin 3 In The DI 5B modules are...

Страница 103: ...thermocouple types J K T E R S N and B Its correspond ing output signal operates over a 0 to 5V range Each module is cold junction compensated to correct for parasitic thermocouples formed by the ther...

Страница 104: ...03 Type J 0 C to 500 C 32 F to 932 F 0 36 C DI 5B47J 12 Type J 100 C to 760 C 148 F to 1400 F 0 70 C DI 5B47K 04 Type K 0 C to 1000 C 32 F to 1832 F 0 80 C DI 5B47K 05 Type K 0 C to 500 C 32 F to 932...

Страница 105: ...lation barrier for anti alias ing purposes and the remaining five pole programmable Bessel filter is located on the system side High pass filter ing is achieved through a second order passive filter l...

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Страница 108: ...41 Springside Drive Akron Ohio 44333 Telephone 330 668 1444 Fax 330 666 5434 E mail support dataq com Direct Product Links click on text to jump to page Data Acquisition Data Logger Chart Recorder The...

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