Trigger rearm time on USB 6211

I am using a USB 6211 to generate raster waveform and digital trigger to drive the galvanormeter mirror. I just want to send one cycle of waveform for every trigger pulse. The problem is that it seems like the USB 6211 trigger rearm speed is limited to about 20 Hz, which is quite low. Is this correct?
Any solution?
Attachments:
Triggering.png ‏76 KB

I might use the wrong word to explain it. What I mean by observing the behavior of the device when it was programmed as shown in the code is that no matter how fast my triggering clock was, there seem to be a certain period of time when the device did not accept any trigger pluse. That period of time was about 50 ms or about 20 Hz clock rate. The code worked as I expected it to be at trigger frequency less than 20 Hz. As soon as the clock speed pass 20 Hz, the extra pulse was not accepted.
One thing that I did to verify the 50 ms time limit was by sending 200 Hz of clockspeed and found that the one that close to 50 ms did trig the device.
Is there any example how to setup this device to surpass that trigger speed?
If not possible with the USB 6211, which DAQ device you would reccomend to achieve more than 100 Hz trigger speed, or even better for up to 200 Hz?
Thanks for your response : )

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Attachments:
USB6211_v1.vi ‏212 KB

Hi All,
I'd like to clear a few things up. First, you'll find that if you try to set the delay from ai start trigger and delay from ai sample clock to 0, you'll get an error. Due to hardware synchronization and delays, the min you can set is two. Note that when I say two, I am referring to two tick of the AI Sample clock timebase, which for most acquisitions is the 20MHz timebase. I modified a shipping example so you can play around with those delays if you want to - I find that exporting the signals and looking at them with a scope helps me visualize what is going on. The Manual has some good timing diagrams as well but it looks like you've already hit that. The defaults would give you a delay of 250ns from the start trigger - is this too high for your situation? What is an acceptable delay? I tend to think that "exactly the same time" is a measure of how precise rather than an absolute (think delays in cable length making a difference.)
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Start your camera off of the AI start trigger (an internal signal) and just know it is 250 ns before your first convert.
Export the convert clock to use as a trigger. This assumes your camera can ignore the next set of convert clocks.
More complicated option: Internally you have an ai start trigger, sample clock and convert clock. From your start trigger to the first convert is 250ns but if you export your convert clock you're going to get future convert clocks as well. One option would be to generate a single triggered pulse using a counter (start with the Gen Dig Pulse-Dig Start.vi example) with the AI start trigger as the trigger for the counter, an initial delay of 250 ns, and a high time of whatever you want it to be. This should give you a singe pulse at very close to same time (on the order of path delays) as your first convert clock.
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Attachments:
Acq&Graph Voltage-Int Clk.vi ‏37 KB

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I am using a USB-6211 and want to measure the speed of a motor by counting pulses coming back from sensors on the motor. Speed will vary from 0 to about 5k Hz.
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Attachments:
basic counter example.vi ‏18 KB

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MacBook Pro 15-inch, 3,1, Core 2 Duo 2.2GHz, 6GB RAM, 500GB hard drive with about 300GB free.
Main hard drive is Hitachi HTS725050A9A364:
Capacity: 500.11 GB (500,107,862,016 bytes)
    S.M.A.R.T. status: Verified
Boots up normally with no perpherals attached, but crashes the instant that anything is plugged into any USB port. Here are two kernel panic logs.
Anonymous UUID:                    BF74836E-B8BC-48E9-96CA-0BA9705D26A5
Fri Jun 24 01:01:36 2011
panic(cpu 1 caller 0x5054a6): "OSCollection::_RESERVEDOSCollection6 called."@/SourceCache/xnu/xnu-1504.15.3/libkern/c++/OSMetaClass.cpp:906
Backtrace (CPU 1), Frame : Return Address (4 potential args on stack)
0x79abb9c8 : 0x21b837 (0x5dd7fc 0x79abb9fc 0x223ce1 0x0)
0x79abba18 : 0x5054a6 (0x5de36c 0x5def46 0x5def46 0x6)
0x79abba38 : 0x50834e (0x85f858 0x6 0x79abba78 0x507001)
0x79abba58 : 0x9bb59b (0xb983400 0x0 0x24 0xb99ecc0)
0x79abbab8 : 0x9bb9c2 (0xbaa5e00 0xb99ecc0 0x2 0x9bb9e6)
0x79abbaf8 : 0x987720 (0xbaa5e00 0xb96c500 0x79abbb28 0x0)
0x79abbb48 : 0x543f60 (0xbaa5e00 0xb96c500 0x1 0x506b76)
0x79abbba8 : 0x542137 (0xb96c500 0xbaa5e00 0xb94c3e0 0xb94cba0)
0x79abbc58 : 0x5426e9 (0xb96c500 0xaf0d300 0x0 0xffffffff)
0x79abbca8 : 0x5439b9 (0xb96c500 0x0 0x79abbcd8 0xaebbc20)
0x79abbce8 : 0x542d91 (0xb96c500 0x0 0x79abbd18 0x85f8f8)
0x79abbd28 : 0x984441 (0xb96c500 0x0 0xba45ac0 0xba3d580)
0x79abbd48 : 0x97ce86 (0xb96c500 0xb983000 0x0 0x79abbda8)
0x79abbd88 : 0x9b6d8a (0xb983000 0xaf57200 0x0 0xba478c0)
0x79abbe18 : 0x543f60 (0xb983000 0xaf57200 0x1 0x506b76)
0x79abbe78 : 0x542137 (0xaf57200 0xb983000 0xba47820 0xba4d960)
0x79abbf28 : 0x5426e9 (0xaf57200 0xb8cfc40 0x0 0x516766)
0x79abbf78 : 0x5443d5 (0xaf57200 0x8 0x79abbfac 0x1)
0x79abbfc8 : 0x2a179c (0xba2a0c0 0x0 0x34324e5a 0x48414f49)
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         com.Mouse.driver.MouseSetting(1.0.1)@0x9ba000->0x9c1fff
            dependency: com.apple.iokit.IOUSBFamily(4.2.4)@0x941000
            dependency: com.apple.iokit.IOUSBHIDDriver(4.2.0)@0x9b3000
            dependency: com.apple.iokit.IOHIDFamily(1.6.6)@0x977000
            dependency: com.apple.iokit.IOPCIFamily(2.6.5)@0x92a000
         com.apple.iokit.IOUSBHIDDriver(4.2.0)@0x9b3000->0x9b9fff
            dependency: com.apple.iokit.IOHIDFamily(1.6.6)@0x977000
            dependency: com.apple.iokit.IOUSBFamily(4.2.4)@0x941000
         com.apple.iokit.IOHIDFamily(1.6.6)@0x977000->0x9b2fff
BSD process name corresponding to current thread: kernel_task
Mac OS version:
10K540
Kernel version:
Darwin Kernel Version 10.8.0: Tue Jun 7 16:33:36 PDT 2011; root:xnu-1504.15.3~1/RELEASE_I386
System model name: MacBookPro3,1 (Mac-F4238BC8)
System uptime in nanoseconds: 29865026156
unloaded kexts:
(none)
loaded kexts:
com.Cycling74.driver.Soundflower          1.5.2
com.rogueamoeba.HermesAudio          3.0.2
com.digidesign.iokit.DigiDal          8.0.3f1
com.Mouse.driver.MouseSetting          1.0.1
com.apple.driver.AppleUpstreamUserClient          3.5.7 - last loaded 29000861372
com.apple.driver.AppleMCCSControl          1.0.20
com.apple.driver.AppleHDA          2.0.5f13
com.apple.driver.InternalModemSupport          2.6.2
com.apple.GeForce          6.3.6
com.apple.driver.SMCMotionSensor          3.0.1d2
com.apple.driver.AudioAUUC          1.57
com.apple.Dont_Steal_Mac_OS_X          7.0.0
com.apple.driver.AudioIPCDriver          1.1.6
com.apple.driver.AirPort.Atheros          411.19.4
com.apple.driver.AirPort.Atheros21          425.14.7
com.apple.driver.AppleIntelYonahProfile          14
com.apple.driver.AppleIntelPenrynProfile          17
com.apple.driver.AppleIntelNehalemProfile          11
com.apple.driver.AppleIntelMeromProfile          19
com.apple.driver.ACPI_SMC_PlatformPlugin          4.7.0a1
com.apple.driver.AppleLPC          1.5.1
com.apple.driver.AppleGraphicsControl          2.10.6
com.apple.driver.AppleBacklight          170.0.46
com.apple.kext.AppleSMCLMU          1.5.2d10
com.apple.driver.AppleUSBTrackpad          201.6
com.apple.driver.AppleUSBTCKeyEventDriver          201.6
com.apple.driver.AppleUSBTCKeyboard          201.6
com.apple.driver.AppleIRController          303.8
com.apple.driver.CSRHIDTransitionDriver          2.4.5f3
com.apple.iokit.SCSITaskUserClient          2.6.8
com.apple.BootCache          31.1
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib          1.0.0d1
com.apple.iokit.IOAHCIBlockStorage          1.6.4
com.apple.driver.AppleFWOHCI          4.7.3
com.apple.iokit.AppleYukon2          3.2.1b1
com.apple.driver.AppleUSBHub          4.2.4
com.apple.driver.AppleAHCIPort          2.1.7
com.apple.driver.AppleIntelPIIXATA          2.5.1
com.apple.driver.AppleUSBEHCI          4.2.4
com.apple.driver.AppleSmartBatteryManager          160.0.0
com.apple.driver.AppleEFINVRAM          1.4.0
com.apple.driver.AppleRTC          1.3.1
com.apple.driver.AppleHPET          1.5
com.apple.driver.AppleUSBUHCI          4.2.0
com.apple.driver.AppleACPIButtons          1.3.6
com.apple.driver.AppleSMBIOS          1.7
com.apple.driver.AppleACPIEC          1.3.6
com.apple.driver.AppleAPIC          1.4
com.apple.driver.AppleIntelCPUPowerManagementClient          142.6.0
com.apple.security.sandbox          1
com.apple.security.quarantine          0
com.apple.nke.applicationfirewall          2.1.12
com.apple.driver.AppleIntelCPUPowerManagement          142.6.0
com.apple.driver.DspFuncLib          2.0.5f13
com.apple.driver.AppleProfileReadCounterAction          17
com.apple.nvidia.nv50hal          6.3.6
com.apple.NVDAResman          6.3.6
com.apple.driver.AppleProfileTimestampAction          10
com.apple.driver.AppleProfileThreadInfoAction          14
com.apple.driver.AppleProfileRegisterStateAction          10
com.apple.driver.AppleProfileKEventAction          10
com.apple.driver.AppleProfileCallstackAction          20
com.apple.iokit.IOFireWireIP          2.0.3
com.apple.iokit.IOSurface          74.2
com.apple.iokit.IOBluetoothSerialManager          2.4.5f3
com.apple.iokit.IOSerialFamily          10.0.3
com.apple.iokit.IOAudioFamily          1.8.3fc2
com.apple.kext.OSvKernDSPLib          1.3
com.apple.driver.AppleHDAController          2.0.5f13
com.apple.iokit.IOHDAFamily          2.0.5f13
com.apple.iokit.IO80211Family          320.1
com.apple.iokit.AppleProfileFamily          41
com.apple.driver.IOPlatformPluginFamily          4.7.0a1
com.apple.driver.AppleSMBusPCI          1.0.10d0
com.apple.driver.AppleBacklightExpert          1.0.1
com.apple.iokit.IONDRVSupport          2.2
com.apple.driver.AppleSMC          3.1.0d5
com.apple.iokit.IOGraphicsFamily          2.2
com.apple.driver.CSRUSBBluetoothHCIController          2.4.5f3
com.apple.driver.AppleUSBBluetoothHCIController          2.4.5f3
com.apple.iokit.IOBluetoothFamily          2.4.5f3
com.apple.iokit.IOUSBHIDDriver          4.2.0
com.apple.driver.AppleUSBMergeNub          4.2.4
com.apple.driver.AppleUSBComposite          3.9.0
com.apple.iokit.IOSCSIMultimediaCommandsDevice          2.6.8
com.apple.iokit.IOBDStorageFamily          1.6
com.apple.iokit.IODVDStorageFamily          1.6
com.apple.iokit.IOCDStorageFamily          1.6.1
com.apple.driver.XsanFilter          402.1
com.apple.driver.AppleFileSystemDriver          2.0
com.apple.iokit.IOATAPIProtocolTransport          2.5.1
com.apple.iokit.IOSCSIArchitectureModelFamily          2.6.8
com.apple.iokit.IOFireWireFamily          4.2.6
com.apple.iokit.IONetworkingFamily          1.10
com.apple.iokit.IOUSBUserClient          4.2.4
com.apple.iokit.IOAHCIFamily          2.0.6
com.apple.iokit.IOATAFamily          2.5.1
com.apple.driver.AppleEFIRuntime          1.4.0
com.apple.iokit.IOUSBFamily          4.2.4
com.apple.iokit.IOHIDFamily          1.6.6
com.apple.iokit.IOSMBusFamily          1.1
com.apple.kext.AppleMatch          1.0.0d1
com.apple.security.TMSafetyNet          6
com.apple.driver.DiskImages          289
com.apple.iokit.IOStorageFamily          1.6.3
com.apple.driver.AppleACPIPlatform          1.3.6
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com.apple.iokit.IOACPIFamily          1.3.0
System Profile:
Model: MacBookPro3,1, BootROM MBP31.0070.B07, 2 processors, Intel Core 2 Duo, 2.2 GHz, 6 GB, SMC 1.16f11
Graphics: NVIDIA GeForce 8600M GT, GeForce 8600M GT, PCIe, 128 MB
Memory Module: global_name
AirPort: spairport_wireless_card_type_airport_extreme (0x168C, 0x87), Atheros 5416: 2.0.19.4
Bluetooth: Version 2.2.0f18, 2 service, 1 devices, 1 incoming serial ports
Network Service: Ethernet, Ethernet, en0
PCI Card: pci168c,24, sppci_othernetwork, PCI Slot 5
Serial ATA Device: Hitachi HTS725050A9A364, 465.76 GB
Parallel ATA Device: HL-DT-ST DVDRW GSA-S10N, 7.24 GB
USB Device: Built-in iSight, 0x05ac (Apple Inc.), 0x8502, 0xfd400000
USB Device: Hub, 0x0424 (SMSC), 0x2507, 0xfd100000
USB Device: Generic USB K/B Hub, 0x05c7, 0x7002, 0xfd130000
USB Device: USB OPTICAL MOUSE, 0x093a (Pixart Imaging, Inc.), 0x2510, 0xfd131000
USB Device: Generic USB K/B Hub, 0x05c7, 0x7001, 0xfd133000
USB Device: Apple Internal Keyboard / Trackpad, 0x05ac (Apple Inc.), 0x021a, 0x5d200000
USB Device: IR Receiver, 0x05ac (Apple Inc.), 0x8242, 0x5d100000
USB Device: Bluetooth USB Host Controller, 0x05ac (Apple Inc.), 0x8205, 0x1a100000
<<END>>
Fri Jun 24 00:57:16 2011
panic(cpu 1 caller 0x5054a6): "OSCollection::_RESERVEDOSCollection6 called."@/SourceCache/xnu/xnu-1504.15.3/libkern/c++/OSMetaClass.cpp:906
Backtrace (CPU 1), Frame : Return Address (4 potential args on stack)
0x800cb9c8 : 0x21b837 (0x5dd7fc 0x800cb9fc 0x223ce1 0x0)
0x800cba18 : 0x5054a6 (0x5de36c 0x5def46 0x5def46 0x6)
0x800cba38 : 0x50834e (0x85f858 0x6 0x800cba78 0x507001)
0x800cba58 : 0x9bb59b (0xba41b00 0x0 0x24 0xb91fdc0)
0x800cbab8 : 0x9bb9c2 (0xba6a700 0xb91fdc0 0x2 0x9bb9e6)
0x800cbaf8 : 0x987720 (0xba6a700 0xba44c00 0x800cbb28 0x0)
0x800cbb48 : 0x543f60 (0xba6a700 0xba44c00 0x1 0x506b76)
0x800cbba8 : 0x542137 (0xba44c00 0xba6a700 0xb8c8c40 0xb92f580)
0x800cbc58 : 0x5426e9 (0xba44c00 0xb92cc00 0x0 0xffffffff)
0x800cbca8 : 0x5439b9 (0xba44c00 0x0 0x800cbcd8 0xaf7b7a0)
0x800cbce8 : 0x542d91 (0xba44c00 0x0 0x800cbd18 0x85f8f8)
0x800cbd28 : 0x984441 (0xba44c00 0x0 0xb9c4ac0 0xb8e3be0)
0x800cbd48 : 0x97ce86 (0xba44c00 0xba41f00 0x0 0x800cbda8)
0x800cbd88 : 0x9b6d8a (0xba41f00 0xb086d00 0x0 0xb8ee3c0)
0x800cbe18 : 0x543f60 (0xba41f00 0xb086d00 0x1 0x506b76)
0x800cbe78 : 0x542137 (0xb086d00 0xba41f00 0xb8ee400 0xb8ee700)
0x800cbf28 : 0x5426e9 (0xb086d00 0xb9d6e80 0x0 0x516766)
0x800cbf78 : 0x5443d5 (0xb086d00 0x8 0x800cbfac 0x1)
0x800cbfc8 : 0x2a179c (0xb972260 0x0 0x37326567 0x5f007645)
      Kernel Extensions in backtrace (with dependencies):
         com.Mouse.driver.MouseSetting(1.0.1)@0x9ba000->0x9c1fff
            dependency: com.apple.iokit.IOUSBFamily(4.2.4)@0x941000
            dependency: com.apple.iokit.IOUSBHIDDriver(4.2.0)@0x9b3000
            dependency: com.apple.iokit.IOHIDFamily(1.6.6)@0x977000
            dependency: com.apple.iokit.IOPCIFamily(2.6.5)@0x92a000
         com.apple.iokit.IOUSBHIDDriver(4.2.0)@0x9b3000->0x9b9fff
            dependency: com.apple.iokit.IOHIDFamily(1.6.6)@0x977000
            dependency: com.apple.iokit.IOUSBFamily(4.2.4)@0x941000
         com.apple.iokit.IOHIDFamily(1.6.6)@0x977000->0x9b2fff
BSD process name corresponding to current thread: kernel_task
Mac OS version:
10K540
Kernel version:
Darwin Kernel Version 10.8.0: Tue Jun 7 16:33:36 PDT 2011; root:xnu-1504.15.3~1/RELEASE_I386
System model name: MacBookPro3,1 (Mac-F4238BC8)
System uptime in nanoseconds: 14542624005
unloaded kexts:
(none)
loaded kexts:
com.Cycling74.driver.Soundflower          1.5.2
com.rogueamoeba.HermesAudio          3.0.2
com.digidesign.iokit.DigiDal          8.0.3f1
com.Mouse.driver.MouseSetting          1.0.1
com.apple.driver.AppleUpstreamUserClient          3.5.7 - last loaded 14232543593
com.apple.driver.AppleMCCSControl          1.0.20
com.apple.driver.InternalModemSupport          2.6.2
com.apple.driver.AppleHDA          2.0.5f13
com.apple.driver.AppleLPC          1.5.1
com.apple.kext.AppleSMCLMU          1.5.2d10
com.apple.driver.AppleGraphicsControl          2.10.6
com.apple.driver.AppleBacklight          170.0.46
com.apple.GeForce          6.3.6
com.apple.driver.SMCMotionSensor          3.0.1d2
com.apple.driver.AudioAUUC          1.57
com.apple.Dont_Steal_Mac_OS_X          7.0.0
com.apple.driver.AudioIPCDriver          1.1.6
com.apple.driver.AirPort.Atheros          411.19.4
com.apple.driver.AirPort.Atheros21          425.14.7
com.apple.driver.AppleIntelYonahProfile          14
com.apple.driver.AppleIntelPenrynProfile          17
com.apple.driver.AppleIntelNehalemProfile          11
com.apple.driver.AppleIntelMeromProfile          19
com.apple.driver.ACPI_SMC_PlatformPlugin          4.7.0a1
com.apple.driver.AppleUSBTrackpad          201.6
com.apple.driver.AppleUSBTCKeyEventDriver          201.6
com.apple.driver.AppleUSBTCKeyboard          201.6
com.apple.driver.AppleIRController          303.8
com.apple.driver.CSRHIDTransitionDriver          2.4.5f3
com.apple.iokit.SCSITaskUserClient          2.6.8
com.apple.BootCache          31.1
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib          1.0.0d1
com.apple.iokit.IOAHCIBlockStorage          1.6.4
com.apple.driver.AppleAHCIPort          2.1.7
com.apple.driver.AppleIntelPIIXATA          2.5.1
com.apple.driver.AppleUSBHub          4.2.4
com.apple.iokit.AppleYukon2          3.2.1b1
com.apple.driver.AppleUSBEHCI          4.2.4
com.apple.driver.AppleUSBUHCI          4.2.0
com.apple.driver.AppleSmartBatteryManager          160.0.0
com.apple.driver.AppleEFINVRAM          1.4.0
com.apple.driver.AppleRTC          1.3.1
com.apple.driver.AppleHPET          1.5
com.apple.driver.AppleFWOHCI          4.7.3
com.apple.driver.AppleACPIButtons          1.3.6
com.apple.driver.AppleSMBIOS          1.7
com.apple.driver.AppleACPIEC          1.3.6
com.apple.driver.AppleAPIC          1.4
com.apple.driver.AppleIntelCPUPowerManagementClient          142.6.0
com.apple.security.sandbox          1
com.apple.security.quarantine          0
com.apple.nke.applicationfirewall          2.1.12
com.apple.driver.AppleIntelCPUPowerManagement          142.6.0
com.apple.driver.AppleHDAHardwareConfigDriver          2.0.5f13
com.apple.driver.DspFuncLib          2.0.5f13
com.apple.driver.AppleProfileReadCounterAction          17
com.apple.iokit.IOFireWireIP          2.0.3
com.apple.driver.AppleBacklightExpert          1.0.1
com.apple.nvidia.nv50hal          6.3.6
com.apple.NVDAResman          6.3.6
com.apple.iokit.IONDRVSupport          2.2
com.apple.driver.AppleProfileTimestampAction          10
com.apple.driver.AppleProfileThreadInfoAction          14
com.apple.driver.AppleProfileRegisterStateAction          10
com.apple.driver.AppleProfileKEventAction          10
com.apple.driver.AppleProfileCallstackAction          20
com.apple.iokit.IOSurface          74.2
com.apple.iokit.IOBluetoothSerialManager          2.4.5f3
com.apple.iokit.IOSerialFamily          10.0.3
com.apple.iokit.IOAudioFamily          1.8.3fc2
com.apple.kext.OSvKernDSPLib          1.3
com.apple.driver.AppleHDAController          2.0.5f13
com.apple.iokit.IOGraphicsFamily          2.2
com.apple.iokit.IOHDAFamily          2.0.5f13
com.apple.iokit.IO80211Family          320.1
com.apple.iokit.AppleProfileFamily          41
com.apple.driver.AppleSMC          3.1.0d5
com.apple.driver.IOPlatformPluginFamily          4.7.0a1
com.apple.driver.AppleSMBusPCI          1.0.10d0
com.apple.driver.CSRUSBBluetoothHCIController          2.4.5f3
com.apple.driver.AppleUSBBluetoothHCIController          2.4.5f3
com.apple.iokit.IOBluetoothFamily          2.4.5f3
com.apple.iokit.IOUSBHIDDriver          4.2.0
com.apple.driver.AppleUSBMergeNub          4.2.4
com.apple.driver.AppleUSBComposite          3.9.0
com.apple.iokit.IOSCSIMultimediaCommandsDevice          2.6.8
com.apple.iokit.IOBDStorageFamily          1.6
com.apple.iokit.IODVDStorageFamily          1.6
com.apple.iokit.IOCDStorageFamily          1.6.1
com.apple.driver.AppleFileSystemDriver          2.0
com.apple.driver.XsanFilter          402.1
com.apple.iokit.IOATAPIProtocolTransport          2.5.1
com.apple.iokit.IOSCSIArchitectureModelFamily          2.6.8
com.apple.iokit.IOAHCIFamily          2.0.6
com.apple.iokit.IOATAFamily          2.5.1
com.apple.iokit.IOUSBUserClient          4.2.4
com.apple.iokit.IONetworkingFamily          1.10
com.apple.iokit.IOUSBFamily          4.2.4
com.apple.driver.AppleEFIRuntime          1.4.0
com.apple.iokit.IOFireWireFamily          4.2.6
com.apple.iokit.IOHIDFamily          1.6.6
com.apple.iokit.IOSMBusFamily          1.1
com.apple.kext.AppleMatch          1.0.0d1
com.apple.security.TMSafetyNet          6
com.apple.driver.DiskImages          289
com.apple.iokit.IOStorageFamily          1.6.3
com.apple.driver.AppleACPIPlatform          1.3.6
com.apple.iokit.IOPCIFamily          2.6.5
com.apple.iokit.IOACPIFamily          1.3.0
<<END>>

How to output the digital clock and synchronization signal from the NI USB-6211

Hello,
I need to connect the NI USB-6211 to control a digital to analog convertor chip (AD5541). However, this chip requires three input signals :1) Clock input, 2) Logic input or a synchronization signal and 3) Signal Serial Data input (CS, SCLK, DIN).
how to output the digital clock and the synchronization signal from the NI USB-6211?

Hi SaberSaber,
You should be able to use the counters to generate a pulse train that could be used for clock and synch purposes.
Hope this helps. Let us know if you have more questions.
Dave C.
Applications Engineer
National Instruments

How to use voltage signals as input signals into USB-6211

Hello everyone,
I have a USB-6211 and a PDQ80A -quadrant photo detectot from thorlabs, i am trying to take three voltage signals from the PDQ80A into my PC using USB-6211 from NI. THese voltage signals are X,Y and sum (X+Y).
Looking forward to your reply.
Thanks in advance,
_Perseus

Technically, the question was in the title. But of course, the answer to that is... Connect them using WIRES. It's designed for voltage signals, just wire your cell outputs to whatever DAQ input channels you're going to read.
Using LabVIEW: 7.1.1, 8.5.1 & 2013

How to measure frequency by USB 6211?

Dear all,
I'm using USB 6211 to measure the input analog voltage signal, then use a counter to yield the frequency. Please find the VI figure in the attachement.
The problem is the insteal of measure the right frequency, which is from 300Hz to 1000Hz. There is a lot of high frequency noise from thousand to milliion Hz. I think it pick up the high frequency harmonics. How to avoid it or use a more effective way to achieve the measurements.
Regards,
Alan
Attachments:
flow rate frequency measurement.JPG ‏43 KB

You have to suppress high frequencies on the analog side of your signal. You must set it to a frequency which is not higher than half of your aquisition rate. If you sample with 10 kHz your filter must have a cutoff frequency of max. 5 kHz. Otherwise you will see the signal mirrored at the half of the sample rate. A 6kHz signal will lead to a 4 kHz signal after the sampling.
Waldemar
Using 7.1.1, 8.5.1, 8.6.1, 2009 on XP and RT
Don't forget to give Kudos to good answers and/or questions

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