Filtering random pulses on a FP-SG-140
Hello,
I am a bit of a
newbie when it comes to filtering , I have tested using pt-pt averaging and
median filters but I am hoping that I can reduce noise on the output a little
more.
My system consists
of using a FP-SG-140, FP-RTD-124. I am doing load cell performance tests (where
I apply dead weight and temperature). (the FP-SG-140 is set up to filter
60Hz). I start the application (data is read, a mean pt-pt is appied, the
output is written to a lvm file)... during testing I generally perform ascending
/ decending linearity runs at ambient temperature.... I will then change the
temperature ... a couple of hours later I get zero and full scale load....
reduce the temperature back to ambiet and I perform a zero and full scale load
... and then I finish. The typical output of the load cells that I am working
with is 0-2.0mV/V. With no pt-pt filtering I typically get 0.000477mV pulses
(they appear to be random in nature), with mean pt-pt filtering I can decrease
these pulses to get 0.000250mV/V
I have tried to
reduce the noise as much as possible in the system... with that said it appears
as if there are "pulses in data" for short period of times and the rest of the
time the output remains relatively stable.... how can I filter these pulses? As
it is these pulses which cause the data pt-pt averaging to
"oscillate"....
Is there an example
or another method / labview function that I could use that may improve my
results?
Thank you for your
time
A couple of suggestions:
1) Use the 15 hz filter. It doesn't sound like you are looking
for anything fast (> 1 hz) anyway and the 15 hz filter will get
rid of more noise than the 60 hz. We saw a nice improvement with
this. Note that the update rate is 1.15 s with this filter
so no need to read more often than that.
2) We use an array of readings, usually 5-10 most recent
readings. When we get a new value it replaces the oldest.
Next
we run a standard deviation across the N readings collected and identify which of our N readings 'qualify' by being within
'x' standard deviations of the mean. The value we return to the application is the mean of our qualified readings if
y or more readings qualified; if not, we just return the most recent reading unfiltered.
These two items in combination allow us to approximate the resolution
limit of the sg-140. Not claiming 16 bit accuracy but we
can see the lsb in our output.
Matt
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16/01/2015 11:26:56.610 am com.apple.backupd[1158]: Ejected Time Machine network volume.
16/01/2015 11:27:29.000 am kernel[0]: Google Chrome He (map: 0xffffff803c583780) triggered DYLD shared region unnest for map: 0xffffff803c583780, region 0x7fff92e00000->0x7fff93000000. While not abnormal for debuggers, this increases system memory footprint until the target exits.
16/01/2015 11:27:53.000 am kernel[0]: Google Chrome He (map: 0xffffff803ebd4690) triggered DYLD shared region unnest for map: 0xffffff803ebd4690, region 0x7fff92e00000->0x7fff93000000. While not abnormal for debuggers, this increases system memory footprint until the target exits.
16/01/2015 11:28:52.825 am SystemUIServer[243]: Attempt to use XPC with a MachService that has HideUntilCheckIn set. This will result in unpredictable behavior: com.apple.backupd.status.xpc
16/01/2015 11:29:36.121 am DesktopServicesHelper[877]: notify name "com.apple.filecoordination.dump_request" has been registered 40 times - this may be a leak
16/01/2015 11:29:37.000 am kernel[0]: [ PCI configuration begin ]
16/01/2015 11:29:37.000 am kernel[0]: [ PCI configuration end, bridges 12, devices 17 ]
16/01/2015 11:29:37.000 am kernel[0]: AppleBCM5701Ethernet [en4]: willTerminate - offline
16/01/2015 11:29:37.122 am configd[26]: bootp_client_bind_socket_to_if(en4, 9): setsockopt IP_BOUND_IF failed
16/01/2015 11:29:37.122 am discoveryd[51]: Basic Network GetExtendedFlags ioctl failed Device not configured
16/01/2015 11:29:37.122 am configd[26]: DHCP en4: RELEASE transmit failed
16/01/2015 11:29:37.125 am discoveryd[51]: Basic Network GetExtendedFlags ioctl failed Device not configured
16/01/2015 11:29:37.131 am networkd[127]: +[NETLedBelly stopFastFail] Clearing ledbelly failure cache
16/01/2015 11:29:37.132 am configd[26]: network changed: v4(en4-:192.168.1.198) DNS- Proxy-
16/01/2015 11:29:37.136 am discoveryd[51]: Basic WABServer NetResolverEvent no resolvers, resetting domains
16/01/2015 11:29:37.136 am discoveryd[51]: Basic Bonjour stop listening on en4
16/01/2015 11:29:37.000 am kernel[0]: smb2_smb_parse_change_notify: smb_rq_reply failed 60
16/01/2015 11:29:37.000 am kernel[0]: smb2_smb_parse_change_notify: smb_rq_reply failed 60
16/01/2015 11:29:37.000 am kernel[0]: smb2_smb_parse_change_notify: smb_rq_reply failed 60
16/01/2015 11:29:37.000 am kernel[0]: smb2_smb_read_write_async: smb_rq_reply failed 60
16/01/2015 11:29:41.833 am com.apple.iCloudHelper[1238]: objc[1238]: Class FALogging is implemented in both /System/Library/PrivateFrameworks/FamilyCircle.framework/Versions/A/FamilyCircl e and /System/Library/PrivateFrameworks/FamilyNotification.framework/Versions/A/Famil yNotification. One of the two will be used. Which one is undefined.
16/01/2015 11:29:41.839 am com.apple.xpc.launchd[1]: (com.apple.imfoundation.IMRemoteURLConnectionAgent) The _DirtyJetsamMemoryLimit key is not available on this platform.
16/01/2015 11:29:42.140 am netbiosd[1077]: network_reachability_changed : network is not reachable, netbiosd is shutting down
Here is a similar situation (ethernet going down) but a different trigger (apparently?):
16/01/2015 3:41:09.000 am kernel[0]: pci pause: SDXC
16/01/2015 3:41:36.000 am kernel[0]: PM response took 1998 ms (27, powerd)
16/01/2015 3:41:36.000 am kernel[0]: ARPT: 288540.420526: AirPort_Brcm43xx::powerChange: System Sleep
16/01/2015 3:41:36.000 am kernel[0]: ARPT: 288540.420532: wl0: powerChange: *** BONJOUR/MDNS OFFLOADS ARE NOT RUNNING.
16/01/2015 3:41:37.000 am kernel[0]: AppleBCM5701Ethernet [en4]: Link down (womp enabled, proxy 1379)
16/01/2015 3:41:37.000 am kernel[0]: AppleBCM5701Ethernet [en4]: 0 0 memWrInd fBJP_Wakeup_Timer
16/01/2015 3:41:38.000 am kernel[0]: AppleThunderboltNHIType2::waitForOk2Go2Sx - retries = 86
16/01/2015 5:04:00.000 am kernel[0]: Wake reason: RTC (Alarm)
As an overview of down/up events, this is a filtered view for "link" in the console, showing when the ethernet link going up and down last night while I was asleep:
15/01/2015 11:04:23.757 pm com.apple.backupd[14541]: Copied 186 items (12.6 MB) from volume Macintosh HD. Linked 8558.
15/01/2015 11:17:22.000 pm kernel[0]: en4: attached with 4 suspended link-layer multicast membership(s)
15/01/2015 11:17:26.000 pm kernel[0]: Ethernet [AppleBCM5701Ethernet]: Link up on en4, 1-Gigabit, Full-duplex, Symmetric flow-control, Debug [796d,2301,0c01,0200,c5e1,3800]
16/01/2015 12:12:58.705 am com.apple.backupd[14832]: Copied 959 items (22 MB) from volume Macintosh HD. Linked 9314.
16/01/2015 1:21:48.047 am com.apple.backupd[14954]: Copied 179 items (12.8 MB) from volume Macintosh HD. Linked 7713.
16/01/2015 2:10:19.000 am kernel[0]: AppleBCM5701Ethernet [en4]: Link down (womp enabled, proxy 1379)
16/01/2015 3:10:21.000 am kernel[0]: Ethernet [AppleBCM5701Ethernet]: Link up on en4, 1-Gigabit, Full-duplex, Symmetric flow-control, Debug [796d,2301,0c01,0200,c5e1,3800]
16/01/2015 3:10:32.000 am kernel[0]: AppleBCM5701Ethernet [en4]: Link down (womp enabled, proxy 1379)
16/01/2015 3:34:00.000 am kernel[0]: Ethernet [AppleBCM5701Ethernet]: Link up on en4, 1-Gigabit, Full-duplex, Symmetric flow-control, Debug [796d,0301,0c01,0200,c5e1,3800]
16/01/2015 3:34:00.000 am kernel[0]: AppleBCM5701Ethernet [en4]: 0 0 Linkup - sending up wakeup packet
16/01/2015 3:34:52.000 am kernel[0]: AppleBCM5701Ethernet [en4]: Link down (womp enabled, proxy 1379)
16/01/2015 3:40:32.000 am kernel[0]: Ethernet [AppleBCM5701Ethernet]: Link up on en4, 1-Gigabit, Full-duplex, Symmetric flow-control, Debug [796d,0301,0c01,0200,c5e1,3800]
16/01/2015 3:41:37.000 am kernel[0]: AppleBCM5701Ethernet [en4]: Link down (womp enabled, proxy 1379)
16/01/2015 5:04:07.000 am kernel[0]: Ethernet [AppleBCM5701Ethernet]: Link up on en4, 1-Gigabit, Full-duplex, Symmetric flow-control, Debug [796d,0301,0c01,0200,c5e1,3800]
16/01/2015 5:08:36.823 am com.apple.backupd[15061]: Copied 144 items (12.7 MB) from volume Macintosh HD. Linked 7781.
16/01/2015 5:09:52.000 am kernel[0]: AppleBCM5701Ethernet [en4]: Link down (womp enabled, proxy 1379)
16/01/2015 6:34:56.000 am kernel[0]: Ethernet [AppleBCM5701Ethernet]: Link up on en4, 1-Gigabit, Full-duplex, Symmetric flow-control, Debug [796d,0301,0c01,0200,c5e1,3800]
16/01/2015 6:35:59.000 am kernel[0]: AppleBCM5701Ethernet [en4]: Link down (womp enabled, proxy 1379)
16/01/2015 7:36:03.000 am kernel[0]: Ethernet [AppleBCM5701Ethernet]: Link up on en4, 1-Gigabit, Full-duplex, Symmetric flow-control, Debug [796d,0301,0c01,0200,c5e1,3800]
16/01/2015 7:37:01.000 am kernel[0]: AppleBCM5701Ethernet [en4]: Link down (womp enabled, proxy 1379)
16/01/2015 8:22:17.000 am kernel[0]: Ethernet [AppleBCM5701Ethernet]: Link up on en4, 1-Gigabit, Full-duplex, Symmetric flow-control, Debug [796d,0301,0c01,0200,c5e1,3800]I think I've solved the problem.
The thunderbolt bridge was re-added to my config and I thought it would never go away. So I'd left it there. Problem still existed.
Then I randomly thought to remove it again. Now the problem hasn't yet returned. If it does, I'll post back here.
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