Time doesn't match sampled data?

Hallo all experts,
I write a LV code which reads data from USB 6211 and saves them with time instants in a text file, but the time instants don't correspond the sampled data. The time values are generated by elapsed time, after build array with the data read from DAQ, they are fed to the write to a text file. The test signal is 10 Hz, but the text file yields 0.2 Hz signal. How could I synchronize them?
Any tips are highly appreciated.
win2

Don't use the "elapsed time" express VI for precision timings. It seems to have limited resolution (internally, it converts a timestamp to DBL).
You can use e.g. the tick count to keep track of the time. See the attached comparison. (still there will always be some subtle differences due to the software timings).
LabVIEW Champion . Do more with less code and in less time .
Attachments:
usb6211_forumMOD.vi ‏42 KB

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I've been using my camera primarily for stills, but decided to have my mom tell her story before she wasn't able to. I'm so frustrated with this problem because I know the audio is just fine since I can play it back synchronized throughout the entire clip in WMV. I've tried cleaning out PE caches as best I can figure them out and created new projects without any better luck.
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Editing Mode: DSLR
Timebase: 23.976frames/sec
Video:
Framesize: 1920 x 1080
Pixel Aspect Ratio: Square Pixels (1.0)
Fields: No Fields (Progressive Scan)
Display Format: 24fps Timecode
Audio:
Sampe Rate: 48000 Hz
Output from MediaInfo
General
Complete name                            : Z:\NikonVideo\MomsStory\JDB_20140702_6537.MOV
Format                                   : MPEG-4
Format profile                           : QuickTime
Codec ID                                 : qt
File size                                : 1.46 GiB
Duration                                 : 10mn 32s
Overall bit rate                         : 19.8 Mbps
Encoded date                             : UTC 2014-07-02 18:22:46
Tagged date                              : UTC 2014-07-15 03:24:05
NCDT                                     : NCTG
Video
ID                                       : 1
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : [email protected]
Format settings, CABAC                   : Yes
Format settings, ReFrames                : 2 frames
Codec ID                                 : avc1
Codec ID/Info                            : Advanced Video Coding
Duration                                 : 10mn 32s
Bit rate                                 : 18.3 Mbps
Width                                    : 1 920 pixels
Height                                   : 1 080 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Constant
Frame rate                               : 23.976 fps
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Bits/(Pixel*Frame)                       : 0.368
Stream size                              : 1.35 GiB (92%)
Language                                 : English
Encoded date                             : UTC 2014-07-02 18:22:46
Tagged date                              : UTC 2014-07-02 18:22:46
Transfer characteristics                 : BT.470 System M
Matrix coefficients                      : BT.601
Audio
ID                                       : 2
Format                                   : PCM
Format settings, Endianness              : Little
Format settings, Sign                    : Signed
Codec ID                                 : sowt
Duration                                 : 10mn 32s
Bit rate mode                            : Constant
Bit rate                                 : 1 536 Kbps
Channel(s)                               : 2 channels
Channel positions                        : Front: L R
Sampling rate                            : 48.0 KHz
Bit depth                                : 16 bits
Stream size                              : 116 MiB (8%)
Language                                 : English
Encoded date                             : UTC 2014-07-02 18:22:46
Tagged date                              : UTC 2014-07-02 18:22:46

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buffer tsn: 11 rdba: 0x1684d120 (90/315680)
========> 0x1684d120 (1)
header address 4403265988=0x1067481c4
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*** SERVICE NAME:(SYS$USERS) 2009-08-04 04:37:36.335
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buffer tsn: 11 rdba: 0x1684d120 (90/315680)
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scn: 0x0324.dda9ec3d seq: 0x01 flg: 0x04 tail: 0xec3d0601
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===============
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: Saved
ASA Version 8.4(3)
interface Vlan1
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dns-server value 192.168.1.8 192.168.1.4
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vpn-tunnel-protocol l2tp-ipsec
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dns-server value 192.168.1.8 192.168.1.4
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Chris,
This is still a bit off the mark. I think I might be confusing the issue by including some of the VPN configuration that I had previously installed and working (e.g., two other VPN tunnel groups with split tunneling on one of them). Let's just remove that stuff from consideration. I actually tested the current configs just to see if they are working since the upgrade. testVPN is working with the split tunneling, but testVPNns (no-split tunneling) does not allow external access. I guess there is a NAT config issue there, too, but not sure what it is, yet. I've not investigated that closely.
I want to solve one problem at a time, though I understand there are some interdependencies.
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2. In flow sampling, router cache will maintain entries of all the flows and there may be some way by which one can know how many actual flows were there. But again there is no way to know values of individual attributes in missed flows like srcip/dstip/srcport/dstport etc.(though they are there in flow cache)
3. In case of sampling (1 out of N packets), we anyway multiply #packets and #bytes with N to arrive at estimate for total packets and bytes. When we multiply by N, it means we have taken into account all those packets as well which were NOT sampled. So, it means all the packets which flowed between source and destination have been accounted for. Then there are no missed flows, isn't it ? And if there do exist some missed flows then multiplication by N to extrapolate number of packets/bytes is not correct.
4. What is the use of count of flows anyways. Number of flows may vary depending upon the configuration such as active timeout etc. So, it does not provide any information about the actual flow between source and destination unlike number of packets and bytes.
Please share your thoughts.
Thanks,
Deepak

The simplest way is to call GetTableCellRangeValues with VAL_ENTIRE_TABLE as the range, next summing array elements.
But I don't understand your comment on checksum, so this may not be the more correct method for your actual needs: can you explain what do you mean?
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Time doesn't match sampled data?

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