IOtech WaveBook 512 User Manual Download Page 56

WaveBook/512 and WaveBook/512H

                                                  

03-06-02

WaveBook Operation Reference      3-17

Engineering Units Conversion Using mx + b

Most of our data acquisition products allow the user to convert a raw signal input (for example, one that is
in volts) to a value that is in engineering units (for example, pressure in psi).  The products accomplish this
by allowing the user to enter scale and offset numbers for each input channel, using the software associated
with the product.  Then the software uses these numbers to convert the raw signals into engineering units
using the following “mx + b” equation:

Engineering Units = m(Raw Signal) + b

(1)

The user must, however, determine the proper values of scale (m) and offset (b) for the application in
question.  To do the calculation, the user needs to identify two known values: (1) the raw signal values, and
(2) the engineering units that correspond to the raw signal values.  After this, the scale and offset parameters
can be calculated by solving two equations for the two unknowns.  This method is made clear by the
following example.

Example

An engineer has a pressure transducer that produces a voltage output of 10.5 volts when the measured
pressure is 3200 psi.  The same transducer produces an output of 0.5 volt when the pressure is 0 psi.
Knowing these facts, m and b are calculated as follows.

A - Write a pair of equations, representing the two known points:

3200 = m(10.5) + b

(2)

      0 = m(0.5) + b

(3)

B - Solve for m by first subtracting each element in equation (3) from equation (2):

3200 - 0 = m(10.5 – 0.5) + (b - b)

(4)

Simplifying gives you:

     

 3200 = m(10)

(5)

This means:

m = 320

(6)

C - Substitute the value for m into equation (3) to determine the value for b:

        

0 = 320 (0.5) + b

(7)

So

:

         b = - 160

(8)

Now it is possible to rewrite the general equation (1) using the specific values for m and b that we just
determined:

Engineering Units = 320(Raw Signal) - 160

(9)

The user can then enter the values of m and b into the appropriate location using the facilities provided by
compatible data acquisition software, for example: WaveView, DaqView, Personal DaqView, LogView,
and TempView.  The software uses equation (9) to calculate signal values in engineering units from that
point on.

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Summary of Contents for WaveBook 512

Page 1: ...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 IN...

Page 2: ...smart approach to instrumentation IOtech Inc 25971 Cannon Road Cleveland OH 44146 1833 Phone 440 439 4091 Fax 440 439 4093 E mail sales iotech com Internet www iotech com WaveBook User s Manual WaveB...

Page 3: ...WaveBook User s Manual 481 0901 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com...

Page 4: ...t damage under noted conditions Follow all safety standards of professional practice and the recommendations in this manual Using this equipment in ways other than described in this manual can present...

Page 5: ...document includes an operational reference and a chapter on troubleshooting and customer support The following PDFs are companion documents PDF WaveView and WaveCal Discusses how to install and use t...

Page 6: ...ways other than described in this manual can cause personal injury or equipment damage Pay special attention to all cautions and warnings Reference Notes Information not available at the time of publi...

Page 7: ...vi WaveBook User s Manual 03 08 02 WaveBook 512 and WaveBook 512H Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com...

Page 8: ...a WaveBook System Daisy Chain 2 7 How Channel Numbers are Determined 2 7 Stacking Modules 2 8 Connecting the System to Power 2 9 Calculating the System Power Requirement 2 9 System Examples 2 11 Powe...

Page 9: ...atic Discharge ESD Handling Notice 5 1 Product Care 5 1 ReadMe Files and the Install CD ROM 5 2 Driver Support 5 2 Connection Problems 5 2 Frequently Asked Questions 5 7 Customer Support 5 11 Appendix...

Page 10: ...y module DBK34 or DBK34A uninterruptible power supply modules Easy Connection to Notebook or Desktop PCs Analog Input Channels BNC connectors keep input signals isolated from the chassis and commons H...

Page 11: ...D accuracy 0 025 FS Data packing Yes 20 kHz low pass filter optional Analog input channels 8 DE Differential amplifiers 1 shared by all 8 inputs PGAs 1 shared by all 8 inputs Maximum capacity 72 Chan...

Page 12: ...ncurrent 150 ns capture of multiple input channels and virtually eliminate channel to channel time skewing WBK12 and WBK12A Programmable Low Pass Filter Card 8 channels WBK13 and WBK13A Programmable L...

Page 13: ...2H WBK20A WBK21 WBK20A PCMCIA EPP Interface Card for linking WaveBook to a Notebook PC WBK21 ISA EPP Interface Plug in Board For linking WaveBook to a desktop PC These devices are shipped with separat...

Page 14: ...quisition system The relationship can be broken down into enhancement expansion or both The following illustrates the relationship of various system components Detailed information and product specifi...

Page 15: ...ook 512 and WaveBook 512H General Power Consumption 0 9A max 15 VDC Input Power Range 10 to 30 VDC Operating Temperature 0 to 50 C Storage Temperature 0 to 70 C Humidity 0 to 95 RH non condensing Dime...

Page 16: ...your system s power requirements This chapter pertains to setting up a WaveBook system Topics include how to connect a WaveBook to a PC add option cards and modules properly power a system install sof...

Page 17: ...d parallel cables will not work properly primarily due to a lack of shielding Note that cables CA 35 2 and CA 35 6 are 1284 compliant These are 2 and 6 foot cables respectively Connecting the Communic...

Page 18: ...located on J10 and J11 provide signal pass through when a WBK option card is not installed Refer to the following figure and steps to install an option card into a WaveBook 512 WBK10 or WBK10H module...

Page 19: ...annels WBK10 WBK10H WBK10A Expansion Modules WBK14 Dynamic Signal Conditioning Module WBK15 8 Slot 5B Signal Conditioning Module WBK16 Strain Gage Module WBK17 Counter Input Module with Quadrature Enc...

Page 20: ...cting your devices to power calculate your system s power requirements as discussed in upcoming section of this chapter Note that three examples of system setups follow shortly Using Shielded BNC Conn...

Page 21: ...driven from the main unit s control output Control inputs of additional WBK modules are driven from the preceding unit s control output CA 150 Expansion Signal Cables Expansion signals are carried by...

Page 22: ...WBK 17 24 3 rd WBK 25 32 4 th WBK 33 40 5 th WBK 41 48 6 th WBK 49 56 7 th WBK 57 64 8 th WBK 65 72 How Channel Numbers are Determined The analog input channel numbers are determined by the order of...

Page 23: ...and the necessary mounting screws A Fastener Panel Handle p n HA 111 is also available from the factory HA 111 consists of 1 handle and two mounting screws The previous figure illustrates the simplic...

Page 24: ...ed before proceeding Higher voltages draw fewer Amps for the same power Remember Watts voltage x current W E I The TR 40U power adapter provides power that is sufficient for the WaveBooks and WaveBook...

Page 25: ...K15 WBK16 Maximum Amps It is important to supply your system with adequate reliable power For this reason you need to know your system s power requirement Knowing the power requirement is also importa...

Page 26: ...amps does exceed the TR40U 2 2 amp limit For this reason the WBK14s are receiving power from a second TR 40U Reference Note Although the preceding examples make use of TR 40U power adapters other pow...

Page 27: ...2H Reference Note Although the preceding examples make use TR 40U power adapters other power sources can be used These options are discussed in the following section Power Supplies Artisan Technology...

Page 28: ...s for use with WaveBook expansion WBK modules and transducers DBK30A shares the same base dimensions as other WaveBook products allowing for convenient stacking Note that stacking can be easily accomp...

Page 29: ...ansion products Unless you need 28 V leave the unit in the 14 VDC mode Use of the 28 VDC mode results in a lower runtime as only one battery pack can be used for 14 VDC When in the 14 VDC mode both pa...

Page 30: ...se of the 28 VDC mode is to provide excitation for bridge type sensors such as load cells strain gages and other devices that may be attached to 5B modules inside a WBK15 Excitation voltage from DBK30...

Page 31: ...harging time is increased If AC power is interrupted a new charge cycle will begin automatically when AC power returns 87 21 Even with the AC adapter the batteries will eventually discharge under a Wa...

Page 32: ...The unit s rugged metal package has a compatible 8 11 footprint for convenient stacking with Velcro tabs and optional splice plates and handles for carrying Main and auxiliary power input comes from...

Page 33: ...jumper to short terminals 8 and 7 Power Power In 12 or 24 VDC only Connect MAIN POWER INPUT positive to Terminal 3 of TB1 Connect MAIN POWER INPUT negative to Terminal 5 of TB1 TB1 s Terminal 4 is re...

Page 34: ...A or greater Runtime Approximate runtime under various loads can be computed from the storage capacity 5 A hr in 12 V mode 2 5 A hr in 24 V mode and the load main unit and other DBKs The following Loa...

Page 35: ...e the DBK34A s cover plate This requires the removal of 4 screws 2 per side 3 Examine the fuses F1 through F4 to see which if any have blown Note that you can usually see the blown element through the...

Page 36: ...95 98 Me NT 2000 systems is located in the Windows Control Panel It allows you to add or remove a device and change configuration settings The included test utility provides feedback on the validity...

Page 37: ...e function described above Close The Close button may be used at any time to exit the Daq Configuration applet Daq Configuration Device Inventory Dialog Box Select Device Type Dialog Box This dialog b...

Page 38: ...anges Apply Click on the Apply button to store the configuration Or you can click the following tab Test Hardware Click on the Test Hardware tab to test the current stored configuration for the device...

Page 39: ...to port hardware capabilities WBK30 FIFO Test This performance test checks the data storing capabilities of the optional WBK30 memory card Note that the figure to the right represents results from a p...

Page 40: ...el Expansion Chassis Expansion Module WBK11 WBK11A 8 Channel SSH Cards Signal Conditioning Card WBK12 WBK12A 8 Channel Programmable Low Pass Filter Cards Signal Conditioning Card WBK13 WBK13A 8 Channe...

Page 41: ...er BNC connector is buffered and then switched by the channel selection multiplexer The selected differential pair is then converted to a single ended signal by the programmable gain amplifier PGA and...

Page 42: ...ely until the start of the next sample then selects the input channel PGA gain level shifter offset A D input source The control and timing circuit conveys this information to any attached expansion u...

Page 43: ...e not shown to the same scale WBK10 WBK10H and WBK10A Analog Expansion Modules 8 Channels via BNC Connectors Each WBK10 series module can be used to provide WaveBook with 8 additional differential ana...

Page 44: ...s of 5B Modules available for your application WBK16 Strain Gage Module 8 channels via Standard Female DB9 WBK16 is an 8 channel strain gage signal conditioning module Up to eight WBK16 modules 64 cha...

Page 45: ...el high voltage adapters that can be used with the WaveBook or WBK10 10H 10A expansion modules In addition WBK61 and WBK62 can be used in conjunction with WBK11 WBK12 and WBK13 series cards WBK61 and...

Page 46: ...ommon is isolated from ANALOG COMMON by 10 9 in parallel with 0 1 F For WaveBook or WBK10 10H to correctly measure analog signals each signal must be within 11 volts of ANALOG COMMON The following not...

Page 47: ...otal three Digital Grounds pins 20 24 and 25 Digital I O Connections WaveBook 512 D8 D15 Digital I O data lines A0 A4 Digital I O address lines EN Active low digital I O enable RD Active low read stro...

Page 48: ...L and 300 ns for analog If collecting pre trigger data then triggers are not acted upon until the end of the current pre trigger scan This increases the trigger latency and jitter but preserves the sp...

Page 49: ...ysteresis it can then again produce a trigger by rising above the trigger level Multi Channel Trigger When the small hardware limited latencies of the digital TTL and single channel Channel 1 analog t...

Page 50: ...nals Initialization level or edge specifies the sequence necessary for a signal to be a valid trigger Level triggers become valid as soon as they reach or exceed the trigger level even if they are alr...

Page 51: ...becomes valid it stays valid waiting for the other triggers to become valid until WaveBook is triggered and the acquisition completes If the trigger is non latched instead of latched the channel may n...

Page 52: ...ion is complete Trigger Latency Jitter Trigger latency and jitter depend on the trigger source and the acquisition mode Trigger latency is the duration between the valid trigger and the start of the a...

Page 53: ...s a Software trigger latency and jitter depend greatly on the host computer s speed operating system and printer port protocol Most systems should take much less than 100 s b NC is the number of chann...

Page 54: ...appears you must click OK to continue cycling Note You can use the mX b equation to adjust a channel s scale and offset You can enter user defined units from the mX b dialog box An example of using m...

Page 55: ...right you can enter values for m and b components of the equation that will be applied to the data There is also an entry field that allows you to enter a label for the new units that may result from...

Page 56: ...ade clear by the following example Example An engineer has a pressure transducer that produces a voltage output of 10 5 volts when the measured pressure is 3200 psi The same transducer produces an out...

Page 57: ...3 18 WaveBook Operation Reference 03 06 02 WaveBook 512 and WaveBook 512H Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com...

Page 58: ...d eZ View provide a means of viewing and analyzing data that was previously acquired with WaveView WaveView is detailed in the WaveView WaveCal Document Module which is loaded onto your hard drive as...

Page 59: ...information from your sales representative DaqX Language Drivers for Programmers No programming knowledge is required for using WaveBook in conjunction with the included Out of the Box software packa...

Page 60: ...guidelines include the use of properly grounded mats and wrist straps ESD bags and cartons and related procedures Product Care WaveBooks and WBK options are essentially maintenance free and require a...

Page 61: ...f a device is not configured correctly it will not be accessible from an application If communications cannot be established with the WaveBook or if trying to connect causes the system to hang or cras...

Page 62: ...lem only with the number displayed and does not affect the actual filter setting passed down to the driver Conversion to Snap Master format from the menu option is not supported Snap Master format con...

Page 63: ...PP or ECP printer ports Printer Port Input Output Range Interrupt Request LPT1 0378 037B or 037F 7 LPT2 0278 027B or 027F 5 LPT3 03BC 03BF 7 shares with LPT1 If the settings do not correspond to those...

Page 64: ...let It is possible that a connection may not be made Before doing anything else try the following Recheck your parallel port cable and the power supply so you are certain that the connection is tight...

Page 65: ...tion verify that the parallel port drivers are installed by going to control panel devices hardware profiles parallel port If the drivers are not installed then you need to resolve this issue with you...

Page 66: ...f WaveView DaqX software Answer You can download the latest versions from our website This service is free 3 Topic WBK14 Dynamic Signal Conditioning Module Question Why can t I use the external clock...

Page 67: ...capable of ECP communications This can be done as follows 1 Locate the LPT port communications chip on the main board near the connector that the parallel cable connects to The chip is relatively larg...

Page 68: ...cture the system is still slower than I require What else can I do Answer One option is to install a WBK30 memory card This increases the FIFO buffer inside the WaveBook While this option does not inc...

Page 69: ...not influence transfer speeds per se it will benefit the Windows operating system in operational areas other than transfer speed Note that processor speed usually has less bearing on transfer rates th...

Page 70: ...mpedance ranges noise content and common mode voltages The name of a contact person from your company who can discuss the problems encountered Instructions for return shipping All troubleshooting note...

Page 71: ...5 12 Troubleshooting 03 06 02 WaveBook User s Manual IO version Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com...

Page 72: ...ensional Drawings A 1 Appendix A Dimensional Drawings Dimensions for WaveBook 512 and WaveBook 512H Note Dimensions are in inches Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOU...

Page 73: ...A 2 Dimensional Drawings 03 04 02 WaveBook Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com...

Page 74: ...order to prevent an undesirable interaction between the two stages Also see Buffer Channel In reference to data acquisition channel simply refers to a single input or output entity In a broader sense...

Page 75: ...of an electrostatic charge between bodies having different electrostatic potentials This transfer occurs during direct contact of the bodies or when induced by an electrostatic field ESD energy can da...

Page 76: ...atch the counter value into the acquisition stream Terminal Count In relation to theWBK17 this signal is generated by the counter value There are only two possible values for the terminal count 65 535...

Page 77: ...G 4 Glossary 03 04 02 Data Acquisition Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com...

Page 78: ...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 IN...

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