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Programming Flowcharts

Pulse Output Operations

Get a handle to the C/T subsystem with

olDaGetDASS

Initialize the device driver and get the

device handle with

olDaInitialize

Go to the next page.

Specify C/T subsystem/element 0.

Using an

internal clock?

Yes

Specify OL_CLK_INTERNAL

using

olDaSetClockSource

Specify a clock divider between 2 (the

default) and 65536.

Specify the clock divider using

olDaSetExternalClockDivider

Specify OL_CLK_EXTERNAL

using

olDaSetClockSource

Specify the gate type using

olDaSetGateType

Specify OL_GATE_HIGH_LEVEL for a
high-level gate or OL_GATE_NONE for a
software gate.

Attach an external C/T with a maximum
recommended frequency of 6 MHz to the
Counter 0 In signal.

Specify a frequency of
15 Hz to 12 MHz.

Summary of Contents for KUSB-3100

Page 1: ...www keithley com A G R E A T E R M E A S U R E O F C O N F I D E N C E KUSB 3100 User s Manual KUSB3100 900 01 Rev A January 2005...

Page 2: ...ation without Keithley s express written consent or misuse of any product or part This warranty also does not apply to fuses software non rechargeable batteries damage from battery leak age or problem...

Page 4: ...rate immediately into the manual Addenda are numbered sequentially When a new Revision is created all Addenda associated with the previous Revision of the manual are incorporated into the new Revision...

Page 5: ...that a shock hazard exists when voltage levels greater than 30V RMS 42 4V peak or 60VDC are present A good safety practice is to ex pect that hazardous voltage is present in any unknown circuit before...

Page 6: ...lectric shock and fire replacement components in mains circuits including the power transformer test leads and input jacks must be purchased from Keithley Instru ments Standard fuses with applicable n...

Page 7: ...peration 5 Analog Input Features 7 Analog Input Channels 7 Specifying a Single Analog Input Channel 7 Specifying One or More Analog Input Channels 8 Input Resolution 8 Input Ranges and Gains 9 Specify...

Page 8: ...Output Conversion Modes 18 Single Value Operations 18 Continuous Output Mode 19 Data Transfer 20 Data Format 21 Error Conditions 22 Digital I O Features 23 Digital I O Lines 23 Resolution 23 Operation...

Page 9: ...multaneous Operations 59 Chapter 5 Troubleshooting 73 General Checklist 74 Service and Support 77 Chapter 6 Calibration 79 Using the KUSB 3100 Calibration Utility 81 Calibrating the Analog Input Subsy...

Page 10: ...Contents x...

Page 11: ...ome familiarity with data acquisition principles and that you understand your application What You Should Learn from this Manual This manual provides detailed information about the features of the KUS...

Page 12: ...e module Appendix B Connector Pin Assignments shows the screw terminal assignments for the module Appendix C Reading from or Writing to the Digital Registers describes register level functions you can...

Page 13: ...ual describes how to use the ActiveX controls provided in DTx EZTM to access the capabilities of your module in Microsoft Visual Basic or Visual C DT LV Link Getting Started Manual This manual describ...

Page 14: ...About this Manual xiv...

Page 15: ...1 1 Overview Features 2 Supported Software 3...

Page 16: ...t counter timer C T channel that performs event counting frequency measurement edge to edge measurement and rate generation operations the resolution of the C T is 16 bits in this mode Internal and ex...

Page 17: ...ck Data Acq application you can verify the features of the module display data on the screen and save data to disk DataAcq SDK This DT Open Layers Software Develop Kit SDK allows programmers to develo...

Page 18: ...Chapter 1 4...

Page 19: ...5 2 Principles of Operation Analog Input Features 7 Analog Output Features 16 Digital I O Features 23 Counter Timer Features 25...

Page 20: ...el Multiplexer 2 5 V Reference A D Ch2 A D Ch3 A D Ch1 A D Ch0 12 Bit D A Converter 12 Bit A D Converter DAC 1 DAC 0 From USB Port Power Supply 32 Bit Counter Timer C T Out 0 C T Gate 0 C T In 0 A D C...

Page 21: ...and Error conditions described on page 15 Analog Input Channels The KUSB 3100 module provides eight single ended analog input channels The module can acquire data from a single analog input channel o...

Page 22: ...gain list The channels are read in order from the first entry in the list to the last entry in the list Refer to page 11 for more information about the supported conversion modes The maximum rate at...

Page 23: ...nput ranges for each module For each channel on the KUSB 3100 module choose the gain that has the smallest effective range that includes the signal you want to measure For example if your analog input...

Page 24: ...three entries channels 5 6 and 7 and gains 2 4 and 1 A gain of 2 is applied to channel 5 a gain of 4 is applied to channel 6 and a gain of 1 is applied to channel 7 Input Sample Clock Sources You can...

Page 25: ...The clock frequency is always equal to the frequency of the external sample clock input signal that you connect to the module Analog Input Conversion Modes The KUSB 3100 module supports the following...

Page 26: ...is determined by the frequency of the internal sample clock refer to page 10 for more information about the internal sample clock The sample rate which is the rate at which a single entry in the chann...

Page 27: ...e supports the following trigger sources Software trigger A software trigger event occurs when you start the analog input operation the computer issues a write to the module to begin conversions Using...

Page 28: ...re available the operation stops This wrap mode guarantees gap free data Multiple Data is written to multiple allocated input buffers continuously if no more empty buffers are available the module ove...

Page 29: ...set binary notation For example assume that the software returns a code of 3072 for the analog input value Determine the analog input voltage as follows CodeOffset Binary CodeTwos Complement XOR 2N 1...

Page 30: ...s The KUSB 3100 module provides two analog output channels DACs The module can output data from a single analog output channel or from both analog output channels The following subsections describe ho...

Page 31: ...ous for the D A subsystem refer to page 18 for more information on continuous analog output operations Output Resolution The KUSB 3100 module provides a fixed output resolution of 12 bits Note that th...

Page 32: ...ls are simultaneously updated Output Conversion Modes The KUSB 3100 module supports the following output conversion modes Single value output operations described on this page Continuous output operat...

Page 33: ...lue for DAC1 and so on When it receives the software trigger the module starts writing output values to the analog output channels specified in the output channel list The operation repeats continuous...

Page 34: ...ify one of the following buffer wrap modes in software None Data is written from multiple output buffers continuously when no more buffers of data are available the continuous output operation stops T...

Page 35: ...Vout Offset LSB CodeTwos Complement CodeOffset Binary XOR 2N 1 where FSR is the full scale range 20 V N is the input resolution 12 bits LSB is the least significant bit 0 0048828 Vout is the analog v...

Page 36: ...It is up to the host application to handle this error either by ignoring it or by stopping the output operation To avoid this error try slowing down the output frequency increasing the output buffer s...

Page 37: ...Open Layers you can specify the digital line that you want to read or write in a single value digital I O operation Refer to page 24 for more information about single value operations A digital line i...

Page 38: ...For a single value operation use software to specify digital input port A or digital output port A the gain is ignored Data is then read from or written to the digital lines associated with that port...

Page 39: ...cycles described on page 27 and C T operation modes described on page 28 C T Channels The KUSB 3100 module provides one 32 bit counter timer 16 bits in rate generation mode The counter accepts a C T c...

Page 40: ...xternal and specify a clock divider between 2 and 65536 to determine the actual frequency at which to pace the counter timer operation For example if you connect a 6 MHz external C T clock and use a c...

Page 41: ...gnal In software this is called a high edge gate type Note that this gate type is used for edge to edge measurement operations refer to page 30 for more information about these modes Pulse Duty Cycles...

Page 42: ...on Counter 0 In when the gate is active high level gate or software gate Refer to page 26 for information about specifying the active gate type You can count a maximum of 4 294 967 296 events before...

Page 43: ...are using a known pulse for the duration specify the active gate in software high level or low level When the operation starts read the number of counts that occurred when the gate was active You can...

Page 44: ...er rolls over to 0 and starts counting again You can use edge to edge measurement to measure the following characteristics of a signal Pulse width The amount of time that a signal pulse is in a high o...

Page 45: ...outputs a high to low going pulse with a pulse width of 50 continuously As soon as the operation is disabled rate generation stops The period of the output pulse is determined by the C T clock source...

Page 46: ...Chapter 2 32...

Page 47: ...33 3 Supported Device Driver Capabilities...

Page 48: ...e lists the subsystem types The first column in the table lists all possible subsystem capabilities A description of each capability is followed by the parameter used to describe that capability in th...

Page 49: ...C_SUP_CONTINUOUS_PRETRIG Continuous Operation before and after Trigger Event OLSSC_SUP_CONTINUOUS_ ABOUTTRIG DT Connect Support OLSSC_SUP_DTCONNECT Continuous DT Connect Support OLSSC_SUP_DTCONNECT_ C...

Page 50: ...INGLEDMA Supports Gap Free Data with Dual DMA OLSSC_SUP_GAPFREE_DUALDMA Triggered Scan Mode Triggered Scan Support OLSSC_SUP_TRIGSCAN Maximum Number of CGL Scans per Trigger OLSSC_MAXMULTISCAN 1 0 0 0...

Page 51: ...es Yes Random Channel Gain List Support OLSSC_SUP_RANDOM_CGL Yes Simultaneous Sample and Hold Support OLSSC_SUP_SIMULTANEOUS_SH Channel List Inhibit Support OLSSC_SUP_CHANNELLIST_ INHIBIT Gain Program...

Page 52: ...Support OLSSC_SUP_FILTERPERCHAN Number of Filters OLSSC_NUMFILTERS 1 1 1 1 0 Ranges Number of Voltage Ranges OLSSC_NUMRANGES 1c 1 0 0 0 Range per Channel Support OLSSC_SUP_RANGEPERCHANNEL Resolution...

Page 53: ...mer Event Trigger Support OLSSC_SUP_TIMEREVENTTRIG Number of Extra Triggers OLSSC_NUMEXTRATRIGGERS 1g 0 0 0 0 Clocks Internal Clock Support OLSSC_SUP_INTCLOCK Yes Yes Yes External Clock Support OLSSC_...

Page 54: ...SUP_CTMODE_RATE Yes One Shot Mode Support OLSSC_SUP_CTMODE_ONESHOT Repetitive One Shot Mode Support OLSSC_SUP_CTMODE_ONESHOT_ RPT Up Down Counting Mode Support OLSC_SUP_CTMODE_UP_DOWN Edge to Edge Mea...

Page 55: ...s Low Edge Gate Type Support OLSSC_SUP_GATE_LOW_EDGE Yes Level Change Gate Type Support OLSSC_SUP_GATE_LEVEL High Level Gate Type with Input Debounce Support OLSSC_SUP_GATE_HIGH_LEVEL_ DEBOUNCE Low Le...

Page 56: ...le supports a fixed A D and D A resolution of 12 bits e The resolution of the digital input port port A is fixed at 8 bits or eight digital input lines The resolution of the digital output port port A...

Page 57: ...Value Operations 45 Continuous A D Operations 47 Continuous D A Operations 49 Event Counting Operations 51 Frequency Measurement Operations 53 Edge to Edge Measurement Operations 55 Pulse Output Opera...

Page 58: ...ustration purposes the DataAcq SDK functions are shown however the concepts apply to all DT Open Layers software Note that many steps represent several substeps if you are unfamiliar with the detailed...

Page 59: ...10 V For the A D and D A subsystems set the data flow to OLSSC_SUP_2SCOMP for twos complement data encoding using olDaSetEncoding For the A D and D A subsystems set the channel type to OLSSC_SUP_SING...

Page 60: ...minate the session using olDaTerminate Yes Continued from previous page For the A D subsystem read a single analog input value from channel 0 to 7 using the specified gain 1 2 4 or 8 For the DIN subsy...

Page 61: ...DaSetDataFlow Go to the next page Specify OL_DF_CONTINUOUS the default value Set the data flow to OLSSC_SUP_2SCOMP for twos complement data encoding using olDaSetEncoding Set the channel type to OLSSC...

Page 62: ...essages and buffers see page 65 Stop the operation see page 70 Clean up the operation see page 71 Start the operation with olDaStart Continued from previous page After you configure the subsystem you...

Page 63: ...NUOUS with olDaSetDataFlow Continuous mode is the default setting Set the data flow to OLSSC_SUP_2SCOMP for twos complement data encoding using olDaSetEncoding Set the channel type to OLSSC_SUP_SINGLE...

Page 64: ...page 64 Configure the subsystem using olDaConfig Deal with messages and buffers see page 65 Stop the operation see page 70 Clean up the operation see page 71 Start the operation with olDaStart Continu...

Page 65: ...xt page Configure the subsystem using olDaConfig Specify C T subsystem element 0 Specify the gate type as high level OL_GATE_HIGH_LEVEL or software OL_GATE_NONE using olDaSetGateType Specify the clock...

Page 66: ...ng olDaStart Read the events counted using olDaReadEvents Stop the operation see page 70 Release the device driver and terminate the session with olDaTerminate Continued from previous page Get update...

Page 67: ...lDaGetDASS Initialize the device driver and get the device handle with olDaInitialize Specify the mode as OL_CTMODE_ COUNT using olDaSetCTMode Go to the next page Specify C T subsystem element 0 Speci...

Page 68: ...surement operation using olDaMeasureFrequency Measure done message returned Yes No Message is in the form OLDA_WM_MEASURE_DONE Use the LongtoFreq IParam macro to get the measured frequency value float...

Page 69: ...bsystem using olDaConfig Specify the start edge using olDaSetMeasureStartEdge Specify the clock source as OL_CLK_INTERNAL using olDaSetClockSource Specify the stop edge using olDaSetMeasureStopEdge Sp...

Page 70: ...Release each subsystem with olDaReleaseDASS Event done message returned Yes No Message is in the form OLDA_WM_EVENT_DONE Note that if you want to perform another edge to edge measurement you can call...

Page 71: ...cify OL_CLK_INTERNAL using olDaSetClockSource No Specify a clock divider between 2 the default and 65536 Specify the clock divider using olDaSetExternalClockDivider Specify OL_CLK_EXTERNAL using olDaS...

Page 72: ...art the operation using olDaStart Release the device driver and terminate the session with olDaTerminate Release each subsystem with olDaReleaseDASS Specify the mode using olDaSetCTMode Specify the ou...

Page 73: ...e start list using olDaPutDassToSSList Prestart the subsystems on the simultaneous start list with olDaSimultaneousPreStart Allocate a simultaneous start list using olDaGetSSList See the previous flow...

Page 74: ...taneous Operations cont Deal with messages see page 65 for analog input operations see page 68 for analog output operations Stop the operation see page 70 Clean up the operation see page 71 Continued...

Page 75: ...channels in the A D or D A channel list For the A D subsystem channels 0 to 7 are available you can specify up to 16 channels in the channel gain list For the D A subsystem channels 0 and 1 are avail...

Page 76: ...internal clock olDaSetClockFrequency Use to specify the frequency of the internal clock For the A D and D A subsystems values range from 30 Hz to 50 kHz The driver sets the actual frequency as closel...

Page 77: ...number of samples each sample is 2 bytes olDmAllocBuffer Use to put the buffer on the ready queue olDaPutBuffer Use to specify the buffer wrap mode OL_WRP_NONE for guaranteed gap free operation OL_WR...

Page 78: ...OL_WRP_NONE if buffers are not reused or OL_WRP_ MULTIPLE if all buffers are continuously reused olDaSetWrapMode Use to specify the window in which to post messages Fill the buffer Fill the buffers w...

Page 79: ...returned No Yes Increment a counter if desired Queue message returned No Yes Report the condition The most likely error message is OLDA_WM_OVERRUN The buffer reused message is OLDA_WM_BUFFER_REUSED T...

Page 80: ...l it again See the next page if you want to transfer data from an inprocess buffer Wait for message Yes Return to page 65 The buffer done message is OLDA_WM_BUFFER_DONE Use olDaGetBuffer to retrieve t...

Page 81: ...ess Use to copy the data from the inprocess buffer to the allocated buffer for immediate processing Deal with messages and buffers The buffer into which inprocess data was copied was put onto the done...

Page 82: ...if desired Queue done message returned No Yes Report the condition The most likely error messages include OLDA_WM_UNDERRUN and OLDA_WM_TRIGGER_ERROR The buffer reused message is OLDA_WM_BUFFER_REUSED...

Page 83: ...Buffer to retrieve a buffer from the done queue and get a pointer to the buffer Buffer done message returned No Yes Use new data No Yes olDaGetBuffer Continued from previous page olDaPutBuffer IOcompl...

Page 84: ...buffer is placed on the done queue No messages are generated In addition olDaReset reinitializes the subsystem to the driver s default state Stop in an orderly way olDaStop Waits until the last sample...

Page 85: ...the number of buffers on the done queue olDaGetBuffer Use to retrieve each buffer on the done queue olDmFreeBuffer Use to free each buffer retrieved from the done queue More buffers to free Yes No olD...

Page 86: ...Chapter 4 72...

Page 87: ...73 5 Troubleshooting General Checklist 74 Service and Support 77...

Page 88: ...t installation and configuration information available 3 Check that your system meets the requirements stated in the KUSB 3100 Getting Started Manual 4 Check that you have installed your hardware prop...

Page 89: ...ing Check environmental and ambient temperature consult the module s specifications on page 97 of this manual and the documentation provided by your computer manufacturer for more information Electric...

Page 90: ...while the transducers are wired as single ended inputs or vice versa Check your wiring and ensure that what you specify in software matches your hardware configuration see the instructions in the KUS...

Page 91: ...eithley com If you have difficulty using the KUSB 3100 module Keithley s Technical Support Department is available to provide technical assistance For the most efficient service complete the form on p...

Page 92: ...raphics adapter _____________________________ data bus _________________________ I have the following boards and applications installed in my system ____________________________ ______________________...

Page 93: ...79 6 Calibration Using the KUSB 3100 Calibration Utility 81 Calibrating the Analog Input Subsystem 82 Calibrating the Analog Output Subsystem 85...

Page 94: ...try on the KUSB 3100 modules every six months using the KUSB 3100 Calibration Utility Note Ensure that you installed the KUSB 3100 Device Driver prior to using the KUSB 3100 Calibration Utility Refer...

Page 95: ...lder on your hard disk 2 Double click KUSB 3100 Calibration Exe in the program folder The main menu appears 3 Select the module to calibrate then click OK Once the KUSB 3100 Calibration Utility is run...

Page 96: ...on method To auto calibrate the analog input subsystem perform the following steps 1 Select the A D Configuration tab of the KUSB 3100 Calibration Utility 2 Set the voltage supply on AD Ch0 to 0 V 3 C...

Page 97: ...s applied to AD Ch0 and that A D Channel Select is set to Channel 0 The current voltage reading for this channel is displayed in the A D Value window b Adjust the offset by entering values between 0 a...

Page 98: ...actory Settings to reset the A D calibration values to their original factory settings This process will undo any auto or manual calibration settings Once you have finished this procedure continue wit...

Page 99: ...KUSB 3100 module 3 Adjust the offset by entering values between 0 and 63 in the DAC 0 Offset edit box or by clicking the up down buttons until the voltmeter reads 0 V 4 Connect an external precision v...

Page 100: ...Chapter 6 86...

Page 101: ...87 A Specifications...

Page 102: ...r of gains 4 1 2 4 8 Resolution 12 bit Data encoding twos complement System accuracy to of FSR Gain 1 Gain 2 Gain 4 Gain 8 0 04 0 06 0 08 0 15 Input Range Gain 1 Gain 2 Gain 4 Gain 8 10 V 5 V 2 5 V 1...

Page 103: ...s Sample and hold Aperture uncertainty Aperture delay 2 ns 200 ns Throughput 50 kHz ESD protection per spec Arc Contact 8 kV 4 kV Reference 2 5 V Monotonicity Yes Sample Clock Internal External Yes Ye...

Page 104: ...monic Distortion 70 db 1 kHz Channel Crosstalk 74 db 1 kHz Maximum A D Pacer Clock Single Analog Input Throughput Multiple Analog Input Throughput 50 kHz 50 kHz a Very high input impedance minimizes a...

Page 105: ...hannels 2 Resolution 12 bit Data encoding Twos Complement Nonlinearity 0 05 Differential nonlinearity 1 LSB Inherent quantizing error 1 LSB Output range 10 V Error Zero Gain 4 mV 0 2 Drift Zero bipola...

Page 106: ...w rate 2 V s Glitch energy 1 V sec ESD protection per spec Arc Contact 8 kV 4 kV Monotonicity Yes Output Clock Internal External Yes No Trigger Source Internal External Yes No Table 4 D A Subsystem Sp...

Page 107: ...n 8 out Number of ports 2 8 bit Input termination No Logic family TTL Logic sense Positive true Inputs Input type Input logic load High input voltage Low input voltage Low input current Level sensitiv...

Page 108: ...dge measurement rate generation Resolution 32 bita Minimum pulse width minimum amount of time it takes a C T to recognize an input pulse 200 ns Logic family TTL Inputs Input logic load High input volt...

Page 109: ...de Table 7 External Trigger Specifications Feature KUSB 3100 Specifications Input type Low level or falling edge sensitive Logic family TTL Inputs Input logic load High input voltage Low input voltage...

Page 110: ...fications Feature KUSB 3100 Specifications Input type Rising edge sensitive Logic family TTL Inputs Input logic load Input termination High input voltage Low input voltage Low input current Level sens...

Page 111: ...00 Specifications Power 5 V Enumeration Operation 100 mA 250 mA Physical Dimensions board Dimensions box with screw terminals and feet Weight board Weight box with screw terminals and feet 100 mm L x...

Page 112: ...Appendix A 98...

Page 113: ...99 B Connector Pin Assignments...

Page 114: ...al Output 5 14 DAC 1 34 Digital Output 4 13 DAC 1 Return 33 Digital Output 3 12 DAC 0 32 Digital Output 2 11 DAC 0 Return 31 Digital Output 1 10 2 5 V Reference 30 Digital Output 0 9 Analog Ground 29...

Page 115: ...101 C Reading from or Writing to the Digital Registers...

Page 116: ...lines or write to the digital output lines quickly and do not want to use DT Open Layers to do this you can use the following API functions olReadReg described on page 103 olWriteReg described on pag...

Page 117: ...escription Reads data directly from the digital registers of the module Parameters Name Description hDev A variable of type HDEV that specifies the handle to the device Name Description Address An uns...

Page 118: ...I O lines where bits that have 0 values are input lines and bits that have 1 values are output lines If DIO_PORT_Data is specified for Address the value of the variable pointed to by pData represents...

Page 119: ...tion Writes values directly to the digital registers of the module Parameters Name Description hDev A variable of type HDEV that specifies the handle to the device Name Description Address An unsigned...

Page 120: ...ures the digital I O lines for input 0 or output 1 If DIO_PORT_Data is specified for Address the value specified for DataVal is the value that is written to the configured digital output lines Notes T...

Page 121: ...esolution 17 single value operations 18 subsystem specifications 91 trigger 17 asynchronous operations 35 B base clock frequency 39 binary data encoding 38 buffers 35 63 64 cleaning up 71 dealing with...

Page 122: ...gger 35 scan operations 12 continuous analog output 35 continuously paced 19 how to perform 49 conversion modes continuous scan mode 12 digital I O 24 single value analog input 11 single value analog...

Page 123: ...alog input 15 65 analog output 22 68 event counting 28 40 how to perform 51 55 external clock 26 39 62 external clock divider maximum 39 minimum 40 external digital trigger 13 39 extra trigger 39 F fa...

Page 124: ...N number of differential channels 38 DMA channels 36 extra clocks 39 filters 38 gains 37 I O channels 38 resolutions 38 single ended channels 38 voltage ranges 38 Nyquist Theorem 10 O OLDA_WM_BUFFER_...

Page 125: ...ations 58 in single value operations 46 olDaReleaseSSList 71 olDaReset 70 olDaSetChannelListEntry 61 olDaSetChannelListSize 61 olDaSetChannelType in continuous A D operations 47 in continuous D A oper...

Page 126: ...36 OLSSC_NUMEXTRACLOCKS 39 OLSSC_NUMEXTRATRIGGERS 39 OLSSC_NUMFILTERS 38 OLSSC_NUMGAINS 37 OLSSC_NUMRANGES 38 OLSSC_NUMRESOLUTIONS 38 OLSSC_SUP_2SCOMP 38 OLSSC_SUP_BINARY 38 OLSSC_SUP_BUFFERING 35 OL...

Page 127: ...e width 27 30 40 Q Quick Data Acq 3 R random channel gain list 37 ranges analog input 9 analog output 17 number of 38 rate generation 31 40 resetting an operation 70 resolution analog input 8 analog o...

Page 128: ...40 minimum 40 transferring data analog input 14 analog output 20 triggers 62 analog input 13 external 13 39 setting parameters for 62 software 13 17 39 specifications 95 troubleshooting procedure 74...

Page 129: ...eithley Instruments Inc All other trademarks and trade names are the property of their respective companies A G R E A T E R M E A S U R E O F C O N F I D E N C E Keithley Instruments Inc Corporate Hea...

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