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ID Date Author Type Categoryup Subject
  6468   Thu Mar 29 20:13:21 2012 jamieConfigurationPEMPEM_SLOW (i.e. seismic RMS) channels added to fb master

I've added the PEM_SLOW.ini file to the fb master file, which should give us the slow seismic RMS channels when the framebuilder is restarted. Example channels:

[C1:PEM-RMS_ACC6_1_3]
[C1:PEM-RMS_GUR2Y_0p3_1]
[C1:PEM-RMS_STS1X_3_10]
etc.

I also updated the path to the other _SLOW.ini files.

I DID NOT RESTART FB.

I will do it first thing in the am tomorrow, when Kiwamu is not busy getting real work done.

Here's is a the diff for /opt/rtcds/caltech/c1/target/fb/master:h

controls@pianosa:/opt/rtcds/caltech/c1/target/fb 1$ diff -u master~ master
--- master~	2011-09-15 17:32:24.000000000 -0700
+++ master	2012-03-29 19:51:52.000000000 -0700
@@ -7,11 +7,12 @@
 /opt/rtcds/caltech/c1/chans/daq/C0EDCU.ini
 /opt/rtcds/caltech/c1/chans/daq/C1MCS.ini
 /opt/rtcds/caltech/c1/target/gds/param/tpchn_c1mcs.par
-/cvs/cds/rtcds/caltech/c1/chans/daq/SUS_SLOW.ini
-/cvs/cds/rtcds/caltech/c1/chans/daq/MCS_SLOW.ini
-/cvs/cds/rtcds/caltech/c1/chans/daq/RMS_SLOW.ini
-/cvs/cds/rtcds/caltech/c1/chans/daq/IOP_SLOW.ini
-/cvs/cds/rtcds/caltech/c1/chans/daq/IOO_SLOW.ini
+/opt/rtcds/caltech/c1/chans/daq/SUS_SLOW.ini
+/opt/rtcds/caltech/c1/chans/daq/MCS_SLOW.ini
+/opt/rtcds/caltech/c1/chans/daq/RMS_SLOW.ini
+/opt/rtcds/caltech/c1/chans/daq/IOP_SLOW.ini
+/opt/rtcds/caltech/c1/chans/daq/IOO_SLOW.ini
+/opt/rtcds/caltech/c1/chans/daq/PEM_SLOW.ini
 /opt/rtcds/caltech/c1/target/gds/param/tpchn_c1rfm.par
 /opt/rtcds/caltech/c1/chans/daq/C1RFM.ini
 /opt/rtcds/caltech/c1/chans/daq/C1IOO.ini
controls@pianosa:/opt/rtcds/caltech/c1/target/fb 1$

 

  6484   Wed Apr 4 13:25:29 2012 jamieConfigurationPEMPEM_SLOW (i.e. seismic RMS) channels aquiring

Quote:

I've added the PEM_SLOW.ini file to the fb master file, which should give us the slow seismic RMS channels when the framebuilder is restarted. Example channels:

[C1:PEM-RMS_ACC6_1_3]
[C1:PEM-RMS_GUR2Y_0p3_1]
[C1:PEM-RMS_STS1X_3_10]
etc.

 The framebuilder seems to have been restarted, or restarted on it's own, so these channels are now being acquired.

Below is a minute trend of a smattering of the available RMS channels over the last five days.

2012-04-04-132346_1182x914_scrot.png

  6499   Fri Apr 6 19:04:35 2012 JenneUpdatePEMSTS releveled, GUR2 plugged in

[Den, Jenne]

We were wondering why the STS-2 signal was funny.  When I went to look at it, the X-axis indicator was pointing ~45deg from the x-axis, so that it was pointing between the arms of the IFO.  Also, the bubble in the level was totally stuck on one side.  We locked the masses, and I put the seismometer back to the correct orientation, and then leveled it.  We unlocked the masses and turned the power back on, and hit the auto-zero button a few times.  Right now the X-axis signal is fine, but Y and Z are still railed, but it's been like 24 seconds, not 24 hours since we last hit auto zero, so there's still some time to wait.

Also, GUR2 was unplugged on both ends of the cable.  We plugged it back in.  However, it looks like the *seismometer* labeled #1 is now plugged into *channels* GUR2, and the seismometer labeled #2 is plugged into channels GUR1.  Recall that Den has only modified X, Y, Z for GUR1 channels, not any other channels in the breakout box.

  6529   Thu Apr 12 20:56:07 2012 DenUpdatePEMdaq

GUR1 XYZ, GUR2 XYZ, MC_F channels are now recorded at 256 Hz.

EDIT by JCD:  What Den means to say here is that (a) he modified some .ini files, and (b) he restarted the fb.

  6536   Mon Apr 16 09:10:37 2012 DenUpdatePEMgur2_x

Already not for the first time I notice that GUR2 readjusts its X zero position

seisms.png

 

As a result the coherence between GUR1X and GUR2X is lost, but between GUR2X and GUR2Y shows up. It seems that these two signals mix at some point.

gur12_coh.jpg

  6537   Mon Apr 16 09:44:54 2012 JenneUpdatePEMgur2_x

Quote:

Already not for the first time I notice that GUR2 readjusts its X zero position

As a result the coherence between GUR1X and GUR2X is lost, but between GUR2X and GUR2Y shows up. It seems that these two signals mix at some point.

 Can you go back in time before the X-position jumped to plot the x1-x2 and x2-y2 coherences?  Just to see what things look like?

  6538   Mon Apr 16 14:37:01 2012 DenUpdatePEMgur2_x

Quote:

Quote:

Already not for the first time I notice that GUR2 readjusts its X zero position

As a result the coherence between GUR1X and GUR2X is lost, but between GUR2X and GUR2Y shows up. It seems that these two signals mix at some point.

 Can you go back in time before the X-position jumped to plot the x1-x2 and x2-y2 coherences?  Just to see what things look like?

DAQ is not working now but ordinary the coherence between GUR1X and GUR2X is ~1 at 0.1 - 10 Hz and between GUR2X and GUR2Y is ~0.

  6557   Mon Apr 23 23:20:07 2012 DenUpdatePEMmicrophones

Tonight I wanted to measure the ambient noise level using Blue Bird mics and figure out if Panasonic WM61a or Primo EM172/173 will be good enough or not. Blue Bird that is in the control room does not seem to work. May be the problem is with the pre-amplifier. The output measured by ADC/Oscilloscope is noise ( amplitude=5mV ). I will return to this issue tomorrow.

  6558   Tue Apr 24 09:58:37 2012 steveUpdatePEMearthquake 3.9 magnitude

Local eq shakes the lab

Attachment 1: eq3.9.png
eq3.9.png
  6559   Tue Apr 24 11:27:51 2012 steveUpdatePEMnew chairs

We received 6 new  chairs stools for the work benches that have 36" heights.

The control room east side and general office desks require 18" seat height. The new chairs stools have  minimum seat heights  26"

Please label chairs that we are getting rid of.

P4241026.JPG

  6563   Tue Apr 24 16:15:24 2012 DenUpdatePEMmicrophones

I've installed Blue Bird microphone to listen to the acoustic noise at the PSL near PMC.

DSC_4271.JPG     DSC_4272.JPG

Coherence between MC_F and Blue Bird output (C1:PEM-ACC_MC2_Z for now) is changing from low to high value at frequencies 20 - 200 Hz with period ~1 min. Maybe HEPA works with some periodicity. Now it works pretty hard, ~80% of max.

micro_mc_low.png    micro_mc_high.png

  6564   Tue Apr 24 22:16:59 2012 DenUpdatePEMBlue Bird Pre-Amplifier

 I detached Clyde (pre-amp that was in the control room) to understand why it is not working. I seems that the board circuit is burnt near R40, R47, R45.

DSC_4273.JPG     DSC_4274.JPG

  6565   Wed Apr 25 00:20:01 2012 DenUpdatePEMacoustic noise at 40m

 Blue Bird Mic is suspended close to PMC now and outputs ~10 counts when pre-amp gain is 8 dB. This means that the mic outputs ~2.42 mV. Its sensitivity is 27 mV/Pa => acoustic noise is ~0.1 Pa or ~75 dB SPL.

If we buy Panasonic WM61A with their sensitivity -35 dB => they will output ~1.7 mV. We can amplify this signal without adding significant noise. For WM61A S/N ratio is given to be 62 dB. This is for some standard signal that is not specified. For Blue Bird mic it is specified according to IEC 651. So I assume SPL of the standard signal = 94 dB => noise level of WM61A is 32 dB (pretty bad compared to 7 dB-A of Blue Bird). But in our case for PSL S/N ratio is ~43 dB that is not too bad. PSL is noisy due to HEPA, acoustic noise level close to MC2 stack will be less. So we may want to consider Primo EM172/173 where the noise level is claimed to be 18 dB less. I think we should buy several WM61A and EM172.

  6566   Wed Apr 25 11:45:34 2012 JenneUpdatePEMBlue Bird Pre-Amplifier

It looks like we should change the "R40" and "R47" diodes.  If you do it this week, ask Jamie or Koji to check that you've got them oriented correctly before soldering them and plugging it in.

  6567   Wed Apr 25 18:59:47 2012 ranaUpdatePEMBlue Bird Pre-Amplifier

Usually R is for resistors and D is for diodes. Do you think from the schematic that we should put diodes into the R slots?

  6568   Wed Apr 25 19:32:57 2012 DenUpdatePEMBlue Bird Pre-Amplifier

Quote:

Usually R is for resistors and D is for diodes. Do you think from the schematic that we should put diodes into the R slots?

 That guys are resistors.

  6572   Thu Apr 26 11:56:10 2012 DenUpdatePEMBlue Bird Pre-Amplifier

Quote:

Quote:

Usually R is for resistors and D is for diodes. Do you think from the schematic that we should put diodes into the R slots?

 That guys are resistors.

 You are right, they just looked like they were too small to be resistors when I glanced at them. 

  6581   Fri Apr 27 13:32:06 2012 DenUpdatePEMseism channels

A few weeks ago I found that GUR2_X signal is biased from 0 to 800 counts in average. I decided that the corresponding channel in the readout box is bad - adds DC voltage to the signal. I stopped using GUR2_XYZ channels of the seism readout box. Now the same thing happened with the GUR1_XYZ channels. I checked the signals coming out from the seism box with the oscilloscope and they were fine. So the problem is not in the readout box. Then I applied 1 V sine wave to the input of AA board to the GUR1_X and ACC_MC1_Z channels. GUR1_X channel still shows noise. Something is wrong with these channels inside the AA board or in the ADC.

pem.png

 

Edited by Den: GUR1_XYZ_IN1 signals are empty though GUR1_XYZ are fine. So the problem is just that GUR1_XYZ_IN1 are not acquired for now though some of the ACC_IN1 channels contain the signal. I need to correct .ini files.

  6593   Wed May 2 19:47:20 2012 DenUpdatePEMEM 172 nonlinearities

I've checked new small EM172 microphones for nonlinearities using Koji's Mac Book speakers. EM172 + Mac nonlinearities are presented at the figure

500Hz_noise.png

The Mac's sound frequency was specified to be 500 Hz. Harmonics are seen at 1k, 1.5k, but their amplitude is ~30 times less.

  6594   Wed May 2 21:04:06 2012 DenUpdatePEMEM 172 coherence

I measured coherence between 2 EM 172 microphones in a "quiet room" with SR785

em_coh.png

High-frequency noise (>2k) is SR785 noise - I'm not using any amplifier now, the signal from microphone is sent directly to SR785 and is weak at high frequencies.

  6610   Sun May 6 01:41:55 2012 DenUpdatePEMseismic in x,y arms

I locked x,y arms and measured coherence between POS{X,Y}11_I_ERR, MC_F and seismometer signals.

coh_xyf.png

Surprisingly, coherence between POSY and GUR1Y is low, but with GUR1X is relatively high. I wonder if this is due to MC that brings this x-axis noise to the arms.

  6651   Sun May 20 19:57:51 2012 DenUpdatePEMmicrophones

I've soldered EM172 microphones to BNC connectors to get data from them.

DSC_4287.JPG    DSC_4285.JPG

Then I've build an amplifier for them. The circuit is

scheme.png

I've build 6 such circuits inside 1 box. It needs +15 V to A3 and GND to A2. A1 power channel is not used.

DSC_4284.JPG     DSC_4286.JPG

LISO model for this scheme was created and simulation results were compared to measurement of each channel

freq_resp.png   noise.png

Measured noise curve (green) is the SR785 own noise.

  6664   Tue May 22 23:36:02 2012 DenUpdatePEMmircophones

I've put 5 EM172 microphones close together and measured there signal and coherence. They are plugged in to accelerometer channels.

close_micro.png

 

Then I've suspended microphones around the MC - 2 at MC2, 2 at MC1,3 and 1 at PSL. The amplifier box is above STS readout box.

 DSC_4288.JPG           DSC_4299.JPG       DSC_4304.JPG      DSC_4302.JPG

Microphone close to PSL gave a strong coherence with MC_F, as we already saw it using Blue Bird Microphone.

ACC_MC2_XY channels <=> MC2 microphones

ACC_MC1_XY channels <=> MC1,3 microphones

ACC_MC1_Z channel <=> PSL microphones

5_mic.png

 

  6666   Wed May 23 11:30:39 2012 steveUpdatePEMnew emergency back up lights installed

New self checking emergency back up lights were installed at 13 locations in the 40m lab.

Attachment 1: IMG_1217.JPG
IMG_1217.JPG
  6671   Thu May 24 02:55:36 2012 DenUpdatePEMacoustic noise in MCL

Mic in the PSL showed that fluctuations in the MCL in the frequency range 10 - 100 Hz are due to acoustic noise. I've measured MCL, MCL / PSL mic coherence 2 times with interval 300 seconds.

Surprisingly, acoustic noise level did not change but MC sometimes is more sensitive to acoustic noise, sometimes less.

audio_noise.png

  6674   Thu May 24 13:28:38 2012 DenUpdatePEMHEPA

HEPA filter was running at 90% of max. I reduced it to 20%. Acoustic noise moved down

psl_acoustic.png

The range of MCL oscillations has also decreased but fluctuations in the frequency range 10-100 are still present.

MCL is much more stable now.

mcl_90.png        mcl_20.png

 

  6692   Sat May 26 20:40:48 2012 DenUpdatePEMexperiments with seismic noise

I measured relative motion of 2 seismometers separated by 4, 18 and 38 feet.

DSC_4307.JPG         DSC_4308.JPG

Relative motion for difference distances between seismometers is presented below.

    psd_distance.png        ratio.png

 

Al frequencies f < fcrit relative motion becomes smaller then motion of each point. At these frequencies, the ratio relative / absolute motion can be approximated as ratio = C fa . The following table summarizes fcrit, C and a for different length between seismometers.

 

L, ft fcrit, Hz
C a
4 45 0.0074 1.30
18 30 0.0057 1.52
38 15 0.0208 1.43

Using this approximation we can estimate the desired noise floor of the seismometer to subtract seismic noise from MC_F

sim_delta.png

Desired seismometer noise should be 100 times less then Guralp's. ADC noise is still less then this level, so this will not be a problem.

Note: for longer cavities condition for seismometer noise becomes more week as fcrit decreases with length.

  6693   Sat May 26 23:57:11 2012 DenUpdatePEMGuralp noise

I've looked through the Guralp manual to figure out what noise do they declare. They present it in acceleration units in dB relative to 1 m2 / s4 / Hz. I've converted my measurements to this units and got

noises.png

They declare much better noise. May be linoleum makes an effort. Do we have any isolation boxes?

  6695   Sun May 27 23:15:22 2012 DenUpdatePEMexperiments with seismometers

I wondered if linoleum is a reason of high Guralp noise. I measured Guralp noise in 3 cases: they stand on a very soft piece of paper, linulium and stone.

DSC_4309.JPG               DSC_4310.JPG                  DSC_4311.JPG

I've calibrated the noise to units m/s/sqrt(Hz). Using soft paper we get the worst noise, stone - the best, but noises do not differ that much and still much worse then declared noise in the manual.

loc_noise.png

  6696   Tue May 29 00:35:57 2012 DenUpdatePEMguralp readout box

I measured the frequency response of the Guralp readout box and noise by providing sin signal of amplitude 50 mV at 15 Hz for channels 1-3.

1_3.png

It turns out that the gain is ~250, while my liso model simulated it to be 200. This is because it is hard to approximate AD620 amplifier.

Noise of the box does not seem to be too bad at low frequencies.

  6697   Tue May 29 00:39:52 2012 DenUpdatePEMGuralp noise

I've connected Guralp output to the ADC without readout box. I've got the same noise at low frequencies and even worse noise at high frequencies. However, readout box was still used as DC supply and the signal was read from INPUT test points. I'll do the same experiment without touching readout box at all.

in_out.png

  6698   Tue May 29 00:48:51 2012 DenUpdatePEMsts readout box

STS readout box seems to be partly broken. I've terminated inputs from the seismometer and measured the output. I could not do this for vertical channel because it outputs 7 V DC + 500 mV AC signal. All the switches work fine, 5 V DC is indeed shown when auto zero, calibration, 1 sec resp, sig select are enables. The box has AC power supply that seems to work ok, all measured DC values are equal to the labels. Something is wrong with amplification.

 

sts_box.png

 

  6712   Tue May 29 22:48:37 2012 DenUpdatePEMGuralp noise

I've checked whether the Guralp noise that we see comes not from seismometer but from ADC or readout box. I did 2 separate measurements . First, I've split 1 signal from Guralp into 2 before the input to AA board and subtracted one from another using Wiener filter. Second, I've connected inputs of channels 1 and 4 of the seismometer readout box and put the signal from seismometer to channel 1.

split_noises.png

The plot shows that ADC and readout box do not contribute too much to the Guralp noise.

  6721   Wed May 30 22:51:32 2012 DenUpdatePEMguralp isolation box

When I've put Guralps inside the isolation box, the signal from seismometers increased and was out of AA board range. I've reduced the gain of the readout box by a factor of 2. Now R2 for channels 1-6 is (2000, 1050, 1050, 2000, 1050, 1050) Ohm.

The signal increased in the frequency range 30-50 Hz. Guralp noise become better. That's good. However, it is still worse then in the manual.

As Yuta is dancing on the isolation box, Guralp signal is most time out of the AA board range. So I calculated the noise based on 5 min data. This may be enough, but I'll repeat the experiment later with 30 min data.

lin_box_noise.png

  6730   Thu May 31 11:38:19 2012 DenUpdatePEMisolation system

I've put Guralps into the Steve's 2 box isolation system. Noise got better, coherence between 2 seismometers improved. We still need better performance. Probably, one device is noisy and we can not determine which one using these 2 seismometers. We need more seismometers. Sadly, STS-2 readout box is not working.

lin_box_noise2.png    lin_box_coh.png

  6747   Sun Jun 3 01:30:07 2012 DenUpdatePEMsts-2 and guralp in isolation box

We have 2 sts-2 readout box - pink and blue. Pink outputs 12 DVC - this a problem of amplifier. This box has a rectifier (the box works from AC power) and an amplifier for velocity channels. Mass positions, calibration channels are connected by a wire from input to output. The amplifier for velocity channels does not work properly, so I connected velocity channels directly to the output - the signal from sts-2 is large enough even without amplification. When I plugged sts-2 to pink readout board, on the velocity output I saw ~4 VDC. Sts-2 was needed to be recentered. I pressed AUTOZERO command, but this did not work out. Before I had checked that this readout box indeed gives an autozero logical signal - 5VDC for ~2 sec. I think it does not provides sts-2  with enough current, seismometer needs 0.1 A in autozero regime.

Blue readout box after switching it to 1 sec regime and zeroing sts-2 started to output reasonable signal for gains = 10. I tried gains = 100, X velocity channel started to output noise. Now the gain is 10 and the response is 120 sec. But at least this box works. Still performance is not clear as well as noise level. To determine this I've put sts-2 to isolation box.

DSC_4315.JPG                    DSC_4319.JPG

After I've put Guralps in the isolation and waited for a couple of days, Guralp noise has been improved a little more.

lin_box_noise.png                 mcl_gur.png

  6754   Tue Jun 5 14:17:14 2012 steveUpdatePEMair cond maintenance

 

 Air conditioning maintenance is scheduled for tomorrow from 8 to 11am

  6782   Thu Jun 7 09:52:05 2012 steveUpdatePEMair cond maintenance

Quote:

 

 Air conditioning maintenance is scheduled for tomorrow from 8 to 11am

 Jeff checked and  replaced filters  as needed. Job completed this morning.

Attachment 1: PEM800d.png
PEM800d.png
  6845   Thu Jun 21 09:10:08 2012 steveUpdatePEMflow bench must be running all times

The south end flow bench HEPA filter should be run all times. You can turn it off for a measurement or two but remember we are storing clean optics there.

The zero count bench will reach  room particle count  ~ 10,000 in one minute.

  6846   Thu Jun 21 12:13:35 2012 JenneUpdatePEMflow bench must be running all times

Quote:

The south end flow bench HEPA filter should be run all times. You can turn it off for a measurement or two but remember we are storing clean optics there.

The zero count bench will reach  room particle count  ~ 10,000 in one minute.

 My bad.  I turned it off last night to see if it would help make the Xgreen more stable, and then when I woke up this morning I realized that I had forgotten to turn it back on.  Bad Jenne.

  6869   Mon Jun 25 15:19:07 2012 YaakovUpdatePEMAdded microphone channels, moved accelorometer channels

Jenne and I renamed the mic channels Den created (elog 6664) to MIC_1, MIC_2, etc from the original accelerometer names to keep things clear. We then added 6 new channels (22-27) for the accelerometers, named ACC_MC1_X, Y, Z, ACC_MC2_X, Y, Z, etc. (See the screenshot below). We also added a DAQ channel block and listed out the IN1 channel of all the sensors. We compiled and started the model, and checked that all the channels were there in DataViewer.

channels.png

  6932   Fri Jul 6 20:54:54 2012 MashaUpdatePEMCurrent PEM status

Hi everybody,

Last night I (with the help of Jenne and Jenne's advice - not to implicate her in this or anything) changed the filters for GUR1, GUR2, and STS in C1:PEM-RMS, adding a butterworth bandpass filter at each corresponding frequency band as well as a gain to convert from counts to micros/sec, and then adding a low pass filter in case of aliasing upon squaring.

Currently the seismic signals are going crazy, and producing "Nan" output on the strip graph (which leads to the instantaneously sharp spikes - which leads to the entire signal being filled on the visualizer on the wall). I checked the DataViewer output and the tdsdata output using both grep and wc, and it seems that both every single signal point is present and is a real number (also not a small real number, thereby debunking floating-point error). I'm currently not sure why seismic-strip reads out 'Nan' - perhaps because it's taking the log of 0, taking a negative log, taking the root of a negative number, or dividing by zero.

Does anyone know if the seismic-strip Nan issue is a program bug? If it's not (and therefore a filter bug), please let me know as well.

I'll be in lab for the rest of the night changing the butterworth filters to odd-order elliptic filters (at Rana's suggestion), as well as changing the cut-off frequency for the low-pass filters.

I'll E-log about it when I'm done.

Just to be sure that my numbers are correct - The STS, GUR1, and GUR2 channels all have gain 10, right? (I parsed through the e-log, and these seem to be the most recent numbers

Thanks for your help,

Masha

  6933   Fri Jul 6 22:30:14 2012 MashaUpdatePEMCurrent PEM status

Quote:

Hi everybody,

Last night I (with the help of Jenne and Jenne's advice - not to implicate her in this or anything) changed the filters for GUR1, GUR2, and STS in C1:PEM-RMS, adding a butterworth bandpass filter at each corresponding frequency band as well as a gain to convert from counts to micros/sec, and then adding a low pass filter in case of aliasing upon squaring.

Currently the seismic signals are going crazy, and producing "Nan" output on the strip graph (which leads to the instantaneously sharp spikes - which leads to the entire signal being filled on the visualizer on the wall). I checked the DataViewer output and the tdsdata output using both grep and wc, and it seems that both every single signal point is present and is a real number (also not a small real number, thereby debunking floating-point error). I'm currently not sure why seismic-strip reads out 'Nan' - perhaps because it's taking the log of 0, taking a negative log, taking the root of a negative number, or dividing by zero.

Does anyone know if the seismic-strip Nan issue is a program bug? If it's not (and therefore a filter bug), please let me know as well.

I'll be in lab for the rest of the night changing the butterworth filters to odd-order elliptic filters (at Rana's suggestion), as well as changing the cut-off frequency for the low-pass filters.

I'll E-log about it when I'm done.

Just to be sure that my numbers are correct - The STS, GUR1, and GUR2 channels all have gain 10, right? (I parsed through the e-log, and these seem to be the most recent numbers

Thanks for your help,

Masha

 

UPDATE: I changed all of the GUR1Z channels to order-5 elliptic filters. I approximated the attenuation for each one by setting the integral from _CutoffFrequency to 10^3 Hz of 10^(-Percent(f)/20) df to 0.01, where Percent(f) is a linear approximation of the relationship between the log of the frequency and the dB level (with the attenuation defining one of the points). Right now the Nan problem continues to persist, even after I loaded the coefficients. In Dataviewer, the channels look relatively normal for the past 10 minutes, as does the data when viewed with tdsdata.

 

Attachment 1: MashaDV.png
MashaDV.png
  6934   Sat Jul 7 15:48:00 2012 MashaUpdatePEMCurrent PEM status

Quote:

Quote:

Hi everybody,

Last night I (with the help of Jenne and Jenne's advice - not to implicate her in this or anything) changed the filters for GUR1, GUR2, and STS in C1:PEM-RMS, adding a butterworth bandpass filter at each corresponding frequency band as well as a gain to convert from counts to micros/sec, and then adding a low pass filter in case of aliasing upon squaring.

Currently the seismic signals are going crazy, and producing "Nan" output on the strip graph (which leads to the instantaneously sharp spikes - which leads to the entire signal being filled on the visualizer on the wall). I checked the DataViewer output and the tdsdata output using both grep and wc, and it seems that both every single signal point is present and is a real number (also not a small real number, thereby debunking floating-point error). I'm currently not sure why seismic-strip reads out 'Nan' - perhaps because it's taking the log of 0, taking a negative log, taking the root of a negative number, or dividing by zero.

Does anyone know if the seismic-strip Nan issue is a program bug? If it's not (and therefore a filter bug), please let me know as well.

I'll be in lab for the rest of the night changing the butterworth filters to odd-order elliptic filters (at Rana's suggestion), as well as changing the cut-off frequency for the low-pass filters.

I'll E-log about it when I'm done.

Just to be sure that my numbers are correct - The STS, GUR1, and GUR2 channels all have gain 10, right? (I parsed through the e-log, and these seem to be the most recent numbers

Thanks for your help,

Masha

 

UPDATE: I changed all of the GUR1Z channels to order-5 elliptic filters. I approximated the attenuation for each one by setting the integral from _CutoffFrequency to 10^3 Hz of 10^(-Percent(f)/20) df to 0.01, where Percent(f) is a linear approximation of the relationship between the log of the frequency and the dB level (with the attenuation defining one of the points). Right now the Nan problem continues to persist, even after I loaded the coefficients. In Dataviewer, the channels look relatively normal for the past 10 minutes, as does the data when viewed with tdsdata.

 

 FIGURED IT OUT - THERE WAS A PROBLEM WITH THE LOW PASS FILTERS (TOO HIGH ORDER). FIXING IT NOW, SHOULD BE GOOD IN AN HOUR. 

  6935   Sat Jul 7 16:34:41 2012 MashaUpdatePEMPEM no longer freaking out (as much).

Hi everybody,

Sorry for flooding the ELOG about the PEM channels. Today I

- Changed all of the GUR1 and GUR2 filters to elliptic, and lowered the orders of their low-pass filters.

- Lowered the order of the low-pass filters on the STS channels

- Changed the parameters in seismic.strip, which I saved as MashaTemplate2.

 

Attached is the most recent status of the channels as seen with StripTools:

Attachment 1: Masha.png
Masha.png
  6936   Sat Jul 7 17:28:11 2012 MashaUpdatePEMPEM no longer freaking out (as much).

Quote:

Hi everybody,

Sorry for flooding the ELOG about the PEM channels. Today I

- Changed all of the GUR1 and GUR2 filters to elliptic, and lowered the orders of their low-pass filters.

- Lowered the order of the low-pass filters on the STS channels

- Changed the parameters in seismic.strip, which I saved as MashaTemplate2.

 

Attached is the most recent status of the channels as seen with StripTools:

I'm not currently sure how to apply my template to seismic.strip shown on the wall (I saved it as seismic.strip on Pianossa and copied the old file to seismic.stripOld). I understand the job is being run on Megatron. I'll play around with this later tomorrow. (In other words, the display currently on the wall, while it does not have the Nan spikes like yesterday and this morning does not currently display the template I made).

  6943   Mon Jul 9 10:52:48 2012 MashaUpdatePEMStripTools on Wall

The RMS signals generated by the updated filtering process are now on the wall. The NaN issue is gone it seems, and the template has been changed. Thanks for your help, Jenne. 

  6945   Mon Jul 9 15:05:00 2012 JenneUpdatePEMSeismometers being moved, new safety shower

[Masha, Jenne]

Masha is moving the seismometers, so they are all off right now.  Were they on, they would see a bunch of noise from the guy outside the 40m front door who is installing a safety shower.

  6959   Wed Jul 11 11:18:21 2012 steveUpdatePEMmore seismic noise next week
 
   The fabricators of the big flume in the CES lab have begun testing the sediment feed system which is the noisiest component and plan to test off and on during the day for the next week.
   Please let me know if you detect the noise or have any issues.
 
 
Brian Fuller

phone: 626-395-2465

  6961   Wed Jul 11 13:45:01 2012 JenneUpdatePEMmore seismic noise next week

Quote:
 
   The fabricators of the big flume in the CES lab have begun testing the sediment feed system which is the noisiest component and plan to test off and on during the day for the next week.
   Please let me know if you detect the noise or have any issues.
 
 
Brian Fuller

phone: 626-395-2465

 Masha and Yaakov - this is an excellent opportunity for you guys to test out your triangulation stuff!  Also, it might give a lot of good data times for the learning algorithms.

Maybe you should also put out the 3 accelerometers that Yaakov isn't using (take them off their cube, so they can be placed separately), then you'll have 6 sensors for vertical motion.  Or you can leave the accelerometers as a cube, and have 4 3-axis sensors (3 seismometers + accelerometer set).

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