How to increase speed of analog read using PCI 6110 and LabView 7.1?
Hi All,
I'm a fairly novice user of LabView and I'm trying to figure out how to make my system as fast as possible. Basically, I'm reading in an analog signal (AI0) together with a trigger signal (PFI0) and I want to sample the analog signal on the falling edge of the trigger signal. What I'm finding, though, is that the acquisition rate of this system is excessively slow. My analog signals occur faster than 1 kHz, but the speed of my system is only about 100 Hz. A colleague of mine told me that the DAQmx Trigger.vi I was using was probably the culprit for the slow performance I was observing. Could this be right? If so, how could I resolve this issue?
Another thought I had was to input the trigger signal into the external source input of the DAQmx Timing.vi. In this way I'd be using the trigger signal as an external clock. If operated in Continuous mode, then I think the Sample Clock would cause a sample to be read only when the trigger signal changes its state (from high to low). Could this work?
Thanks for reading,
Ben
Hi Marni,
Thank you so much for your post! I tried doing as you suggested, using the Cont Acq&Graph Voltage-Ext Clk-Dig Start.vi and I first set the trigger signal as the external clock source. It works beautifully! Now, with 1.6 kHz signal in, I'm reading in 1.6 kSa/s. This is a dramatic improvement from before. I also tried using the internal clock source option, but it didn't seem to trigger when I wanted it to. I didn't spend too much time debugging it, though, since the other method works so well. This brings up an interesting question. Is the DAQmx Trigger.vi really that slow? Previously, I could read in 100 kSa/s at best using the Trigger VI. Anyways, I'm a happy camper now:-)
By the way, to answer your question about the DAQ device, I'm using the NI PCI 6110 Multifunction DAQ.
Thanks again!
Ben
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CALLSTACKLEVEL 0
OMS_RUN_IN_UDE_SERVER NO
OPTIMIZE_QUERYREWRITE OPERATOR
TRACE_QUERYREWRITE 0
CHECK_QUERYREWRITE 0
PROTECT_DATACACHE_MEMORY NO
LOCAL_REDO_LOG_BUFFER_SIZE 0
FILEDIR_SPINLOCKPOOL_SIZE 10
TRANS_HISTORY_SIZE 0
TRANS_THRESHOLD_VALUE 60
ENABLE_SYSTEM_TRIGGERS YES
DBFILLINGABOVELIMIT 70L80M85M90H95H96H97H98H99H
DBFILLINGBELOWLIMIT 70L80L85L90L95L
LOGABOVELIMIT 50L75L90M95M96H97H98H99H
AUTOSAVE 1
BACKUPRESULT 1
CHECKDATA 1
EVENT 1
ADMIN 1
ONLINE 1
UPDSTATWANTED 1
OUTOFSESSIONS 3
ERROR 3
SYSTEMERROR 3
DATABASEFULL 1
LOGFULL 1
LOGSEGMENTFULL 1
STANDBY 1
USESELECTFETCH YES
USEVARIABLEINPUT NO
UPDATESTAT_PARALLEL_SERVERS 0
UPDATESTAT_SAMPLE_ALGO 1
SIMULATE_VECTORIO IF_OPEN_DIRECT_OR_RAW_DEVICE
COLUMNCOMPRESSION YES
TIME_MEASUREMENT NO
CHECK_TABLE_WIDTH NO
MAX_MESSAGE_LIST_LENGTH 100
SYMBOL_RESOLUTION YES
PREALLOCATE_IOWORKER NO
CACHE_IN_SHARED_MEMORY NO
INDEX_LEAF_CACHING 2
NO_SYNC_TO_DISK_WANTED NO
SPINLOCK_LOOP_COUNT 30000
SPINLOCK_BACKOFF_BASE 1
SPINLOCK_BACKOFF_FACTOR 2
SPINLOCK_BACKOFF_MAXIMUM 64
ROW_LOCKS_PER_TRANSACTION 50
USEUNICODECOLUMNCOMPRESSION NO
about send you the data from tables, i dont have permission to do that, since all data is in a production system, the customer dont give me the rights to send any information. sorry about that.
best regards
Clóvis -
HT5957 How to improve speed in Iphone 4 using ios 7
I am using Iphone 4 and updated IOS 7, But speed is very in compare to last version. Please advice me to increase the speed.
Opening contact very low.
call to any number is very low.Hi edumaravilla,
Welcome to the Support Communities!
The following information will explain how Airplay has changed in iOS 7:
iOS: Using AirPlay
http://support.apple.com/kb/HT4437
Here are some troubleshooting steps for Airplay:
iOS: Troubleshooting AirPlay and AirPlay Mirroring
http://support.apple.com/kb/TS4215
Cheers,
- Judy
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