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ID Date Author Type Categoryup Subject
  12000   Fri Feb 19 15:12:38 2016 KojiSummaryPEMGuralp Health Check

I measured the guralp raw outputs and the TFs using the handheld unit and an FFT analyzer.

[Setup]

The handheld unit was connected to each guralp with the same cable which is confirmed t be functional with the Yend Guralp.

The signal for Z, N, and E directions are obtained from the banana connectors on the handheld unit. Each direction has mass, low gain velocity, and high gain velocity output. The PSDs of the signals were measured with an FFT analyzer. The transfer function from the mass signal to the low/high gain signals were also measured for each direction.

The adjustment screw for the E output of the Xend does not work. I had to tilt the Xend Guralp using the leg screws to bring the E signal to zero.

[Result]

Attachment 1: Raw voltage PSD for all outputs
Attachment 2: Comparison of the low gain vel outputs

- All of the mass output show similar PSDs.
- Low gain velocity outputs shows somewhat similar levels. I still need to check if the output is really the ground velocity or not.
- High gain velocity outputs are either not high gain, broken, or not implemented.

- We need to calibrate the low gain output using signal injection, huddle test, or something else.

Attachment 3: TFs between each mass output and the low or high gain outputs

- TFs between the mass signal and the low vel signals show the similar transfer functions between the channels.
- The high gain outputs show low or no transfer function with regard to the mass signals.
 

  12031   Fri Mar 11 16:52:53 2016 SteveUpdatePEMleaky roof

Johannes found dripping water at the vac rack. It is safe. It is not catching anything. Actual precipitation was only 0.62"

  12044   Wed Mar 23 15:23:12 2016 SteveSummaryPEMGuralps as connected

We have one calibration sheet of GUR- B, from 26 June 2008,    model CMG-T40-0008,  sn T4157       at  ETMY  east,  interface box input 1

I'm looking for calibration paper of GUR- A,                                model CMG-T40-0053,  sn T4Q17      at ETMX   south, interface box input 2

Quote:

I measured the guralp raw outputs and the TFs using the handheld unit and an FFT analyzer.

[Setup]

The handheld unit was connected to each guralp with the same cable which is confirmed t be functional with the Yend Guralp.

The signal for Z, N, and E directions are obtained from the banana connectors on the handheld unit. Each direction has mass, low gain velocity, and high gain velocity output. The PSDs of the signals were measured with an FFT analyzer. The transfer function from the mass signal to the low/high gain signals were also measured for each direction.

The adjustment screw for the E output of the Xend does not work. I had to tilt the Xend Guralp using the leg screws to bring the E signal to zero.

[Result]

Attachment 1: Raw voltage PSD for all outputs
Attachment 2: Comparison of the low gain vel outputs

- All of the mass output show similar PSDs.
- Low gain velocity outputs shows somewhat similar levels. I still need to check if the output is really the ground velocity or not.
- High gain velocity outputs are either not high gain, broken, or not implemented.

- We need to calibrate the low gain output using signal injection, huddle test, or something else.

Attachment 3: TFs between each mass output and the low or high gain outputs

- TFs between the mass signal and the low vel signals show the similar transfer functions between the channels.
- The high gain outputs show low or no transfer function with regard to the mass signals.
 

 

  12046   Thu Mar 24 08:20:52 2016 SteveUpdatePEMGuralp-A calibration sheet

Calibration Data

All Guralp instruments and digitisers are provided with calibration documentation. Should you require a copy of calibration information for any product, email caldoc@guralp.com with the serial number of the product in the subject field and calibration information will be sent to you through email.

See data in the 40m wiki

 

  12047   Fri Mar 25 19:17:28 2016 NikhilUpdatePEMGuralp Seismometers

Calibration of Guralp Seismometers

Objective

  • Estimate transfer functions of Guralp A ( near ETMX) and Guralp B ( near ETMY)
  • Calibrate the instruments by estimating Velocity Sensitity Parameter
  • Convert previously measured Voltage Spectrum to Velocity Spectrum

Instruments Used

  • Guralp CMG-40 T Seimometers  : Guralp A (Serial Number: T4Q17)
  • Guralp CMG-40 T Seimometers  : Guralp B (Serial Number: T4157)
  • Guralp Handheld Control Unit (HCU)
  • FFT Spectrum Analyzer: Model SR785: 2 Channel Dynamic Signal Analyzer
  • Oscilloscope: TDS 3014B
  • Function Generator: DS 345

Procedure & Results

Sinusoidal current of known frequency and amplitude was injected to the Seismometer calibration coil using signal generator and handheld control unit & corresponding Magnitude and Phase response were recorded.  For  Guralp B, system response was also estimated with a FFT Spectrum Analyzer. 

 

    

Frequnecy Range: 0.1 Hz to 45 Hz.

Equivalent Input Velocity was derived from the Input Voltage measurements using the relation: v = V/ (2*pi*f*R*K) , V is the peak to peak Calibration Signal voltage, f is the calibration signal frequency, R is the calibration resistor and K is the feedback coil constant.  [See Appendix for R & K values]                                     

Velocity Sensitity at the required frequency is obtained by dividing the Output Response Voltage by the Equivalent Input Velocity.

               

The obtained Velocity Sensitivity is used to convert the recorded Volatge PSD to Velocity PSD as shown below. The obtained results are compared to gloabl high noise model [NHNM] and USGS New Low Noise Model [NLNM,Peterson 1993] which gives the lowest observed vertical seismic noise levels across the seismic frequency band. Plot legend NLNM shows both the high & low levels.

 

                                                                    Guralp A [X Arm] Low Velocity Output                                          

                  

                                                                    Guralp B [Y Arm] Low Velocity Output                                          

            

                                                                            DTT Power Spectrum                                                             

Both the Seismometers were connected to the 40 M Control and Data Acquisition System (CDS) and Power Spectrum was estimated for the Vertical, North/South & East/West Channels using Diagnostic Test Tool (DTT) software.

                                                            

Comments

  •  The transfer function from Guralp A [ETMX] looks similar to that of Guralp B [ETMY] in both magnitude and phase but with a lower gain.                                                                                                                                                                                                  
  • Velocity Sensitivity of Guralp A is comparable to the value provided in the Calibration Data Sheet [~ 400] for all the channels [Vertical, North/South, East/West] after 1 Hz. For Guralp B, Velocity Sensitivity is a factor of 2.5 higher [all channels] than the specification [~ 400] after 1 HZ.Below 1 Hz Sensitivity drops down for both sensors. I am not ruling out a missing common factor in the calculation, but anyway, test shows that Guralp B has ~2.5 times better Velocity Sensitivity than Guralp A.                                                                                                                                                               
  • The Calibrated Seismic Velocity Spectrum for Guralp B is within the Globally Observed High and Low Noise Seismic Spectrum while Guralp A's Spectrum is more noisier above 1 Hz [Anthropogenic Activity normally contributes the most in 1 Hz to 10 Hz frequency band].                                                                                                                                                                                                                                                                          
  • Concurrently acquired Power Spectrum using DTT [Diagnostic Test Tools] shows that Guralp A Spectrum behaves rather strangely. The system response seems to be completely different from the one we obtained locally using signal generator. While Guralp B functionality seems normal. One reason for this erratic beahvior might be faulty cables used for data acquisition from Guralp A. This needs to be verified.                                                                                                                        

Appendix

                                                                            CMG-40T Guralp A Calibration Sheet                                                           

  Velocity Output: V/m/s (Differential) Mass Position Output (Acceleration Output) : V/m/s^2  Feedback Coil Constant : Amp/m/s^2
Vertical 2 x 400 19 0.00397
North/South 2 x 398 23 0.00486
East/West 2 x 401 23 0.00479                 

Calibration Resistor: 51000

                                                                            CMG-40T Guralp B Calibration Sheet                                                           

  Velocity Output: V/m/s (Differential) Mass Position Output (Acceleration Output) : V/m/s^2  Feedback Coil Constant : Amp/m/s^2
Vertical 2 x 401 19 0.00408
North/South 2 x 400 20 0.00421
East/West 2 x 404 22

0.00466

Calibration Resistor: 51000 

  12048   Fri Mar 25 23:54:04 2016 ranaUpdatePEMGuralp Seismometers

Something seems not right. The Guralp response should be flat in velocity from 0.05-30 Hz. Why is there any feature at 1 Hz? Saturation of some kind?

  12084   Wed Apr 20 14:36:45 2016 SteveUpdatePEMdusty lab

It is worth wiping table top covers. Use isopropanol soaked lint free wipes.

 

  12087   Fri Apr 22 13:58:13 2016 SteveUpdatePEMleaky roof is fixed

Dan sealed the leak today.

 

  12096   Thu Apr 28 08:49:47 2016 SteveUpdatePEMpossible noise sources schedule

Building:         Campus (see attached Map)        

       

Date:              Manhole 1 - May 3 through May 5

Manhole 2 – May 6 through May 10

 Manhole 2 - May 16 through May 19

Manhole 3 – May 11 through May 19           

          

Time:              Noise:  7:00 a.m. To 5:00 p.m.

                  Access: 24 Hours a day

           

Interruption:      Noise/Vehicular & Pedestrian Access

                  Storm Drain Manholes

         

*In order to repair 3 manholes associated with a large storm drain that runs north-south through the campus, work will take place at the

3 manholes shown on the map. This work will interrupt vehicular and pedestrian access on the paths adjacent to the manholes. Though the work at Manholes 1 and 2 will allow vehicular and pedestrian access around the manholes, the work at Manhole 3 will completely block the driveway running south from the southeast corner of Parking Lot 11. Noise will also be created by the repair

 

 

  12209   Tue Jun 21 14:12:10 2016 SteveUpdatePEM vacuum envelope wiped

I wiped down the cranes with wet towel and Mario our janitor did the chamber tops with the tubes.

The optical tabels were not touched.

The outside temp peaked at 44 C yesterday

 

  12318   Thu Jul 21 08:24:20 2016 SteveUpdatePEMants alart

The heat drives the ants to the lab!  Make sure the light doors are tight on the chambers.

 

  12365   Wed Aug 3 14:52:37 2016 SteveSummaryPEMGuralps as connected

Guralps as connected with pictures

  12383   Mon Aug 8 10:35:12 2016 SteveUpdatePEMvent 78 day 38

 

Quote:

RGA background scan

Quote:

Vacuum Status: Chamber Open

All chamber annuloses are vented.  Vac Monitor screen is not communicating with gauges. The valve position indicator are working.

RGA is pumped by Maglev through VM2

 

 

 

  12406   Fri Aug 12 21:26:28 2016 ranaUpdatePEMMic Self Noise

Seems to good to be true. Maybe you're over fitting? Please put all the traces on one plot and let us know how you do the parameter setting. You should use half the data for training the filter and the second half for doing the subtraction.

  12408   Mon Aug 15 12:23:56 2016 PrafulUpdatePEMMic Self Noise

I didn't have a separate training set and data set, so I think that's why the graphs came out looking too good. The units on the graphs are also incorrect, I was interpreting PSD as ASD. I haven't been able to get my Wiener filtering code working well- I get unreasonable subtractions like the noise being larger than the unfiltered signal, so Eric showed me this frequency-dependent calculation described here: https://dcc.ligo.org/LIGO-P990002

This seems to be working well so far:

freq1.pdf

freq2.pdf

freq3.pdf

Here's all the plots on one figure:

frequency_dependent.pdf

Let me know if this looks believable.

Quote:

Seems to good to be true. Maybe you're over fitting? Please put all the traces on one plot and let us know how you do the parameter setting. You should use half the data for training the filter and the second half for doing the subtraction.

 

  12429   Mon Aug 22 16:33:32 2016 SteveUpdatePEMthe lab temp is up

The IFO room temp is up a bit and it is coming down. The out side temp is not really high.

  12431   Mon Aug 22 18:35:16 2016 PrafulUpdatePEMthe lab temp is up

The temperature is decreasing slowly but is still above 24 C.

temp_plot.png

Quote:

The IFO room temp is up a bit and it is coming down. The out side temp is not really high.

 

  12498   Fri Sep 16 14:15:28 2016 steveUpdatePEMpartical counts

South end flow bench and both clean room assembly flow benches measured zero counts for 0.3 and 0.5 micron size particales.

The counting efficiency of 0.5 micron is 100%

 

  location

 

 

        0.3 micron particles / cf min

 

 

      0.5 micron particles / cf min

 

 

 counter

 MET

 ONE

 

       effect
 ITMY table  35,000  3,000   #3  
 ETMY table  35,000  3,000   #3  
 ITMX table  24,000  2,400   #3  PSL HEPA at 50V
 ITMX wall mounted  -  2,500   #1  
 ETMX work bench    5,000     600   #3   flow bench on  

 

The PSL HEPA performance was measured at the center of the table with MET ONE #3

 Voltage Variac particles /cf min   particles /cf min
 particle size  0.3 micron  0.5 micron
 60  0  0
 50  10  0
 40  1,400  110
 20  1,400  100
  12538   Fri Oct 7 15:36:03 2016 SteveUpdatePEMthe lab temp is up

The IFO room temp is up

Quote:

The IFO room temp is up a bit and it is coming down. The out side temp is not really high.

 

  12558   Thu Oct 13 14:49:57 2016 KojiConfigurationPEMXLR(F)-XLR(M) cable took from the fibox to the Blue microphone

[Gautam Koji]

XLR(F)-XLR(M) cable for the blue microphone is missing. Steve ordered one.

We found one in the fibox setup. As we don't use it during the vent, we use this cable for the microphone.
Once we get the new one, it will go to the fibox setup.

 

  12582   Thu Oct 27 09:38:32 2016 SteveUpdatePEMmouse

We may have a mouse in the lab.  Do not leave any food scrap in trash ! Traps will be set.

 

  12605   Tue Nov 8 08:51:59 2016 SteveUpdatePEMmouse hole sealed

This is where the mammal came though. It is reach able from room 108 CES

Quote:

We may have a mouse in the lab.  Do not leave any food scrap in trash ! Traps will be set.

 

 

  12629   Mon Nov 21 11:30:01 2016 SteveUpdatePEMrat is cut and removed

Last jump at rack Y2.

  12656   Fri Dec 2 10:57:08 2016 steveUpdatePEM door seal replaced

The south end door leaky weather seals replaced.

The aim is here to get some overpressure inside / outside so the lab partical count would not depend on outside condition.

 

  12673   Thu Dec 8 07:56:05 2016 SteveUpdatePEMEQ6.5m Northen CA

No damage. ITMY is glitching, so it has not been damped.

 

  12687   Thu Dec 29 10:24:56 2016 SteveUpdatePEMEQ5.7mHawthorn NV

Sus damping restored.

 

  12696   Mon Jan 9 09:18:47 2017 SteveUpdatePEMpower glitch

There was a power glitch last night around 1:15am

The vacuum was not effected.

PSL laser turned on, PMC locked, PSL shutter opened and MC locked.

IR lasers at the ends turned on.

East arm air cond turned on.

The computers are all done.

The last power glitch was at Nov 3, 2016

 

 

  12711   Fri Jan 13 10:53:03 2017 SteveUpdatePEMdoors are fixed

Control room to outside door was realigned.

                                                   It is self closing now.

Control room to IFO door lock optimized to soft closing.

All other doors lubricated by Alex of the key shop.

  12712   Fri Jan 13 14:18:28 2017 SteveUpdatePEMair condition fixed

The old control room AC  has been stick in heating mode for about 2 months. It's thermostate and fan belt  was finally replaced. It was calibrated and set to 71 F ( just behind 1X6 on west wall ) around 1pm.

Out belt; sad inside 

at 4 pm Rana cried

It must be too tight.

  12743   Fri Jan 20 14:42:12 2017 SteveUpdatePEMCaltech weather station

We should be able to connect to this station

  12744   Fri Jan 20 17:12:37 2017 SteveUpdatePEMEM172 mic is hooked up in the PSL

Gautam and Steve,

It is hanging in the midle of the PSL enclosure. Wired to 1X1 to get plus and minus 15V through fuse.    It's output is connected to FB c17 input.

GV: C17 corresponds to "MIC 1" in the PEM model. So the output is saved as "C1:PEM-MIC_1_OUT_DQ"

Quote:

I added an EM172 to my soldered circuit and it seems to be working so far. I have taken a spectra using the EM172 in ambient noise in the control room as well as in white noise from Audacity. My computer's speakers are not very good so the white noise results aren't great but this was mainly to confirm that the microphone is actually working.

white_v_ambient.pdf

 

  12789   Thu Feb 2 17:34:25 2017 ranaUpdatePEMEM172 mic is hooked up in the PSL

I don't know if anyone looked at the time series (not trend) or spectrum of the Microphone after installation, but it looks bad and featureless to me. Is the Microphone broken?

This shows the spectrum from early this morning and again from tonight. You can see that it is bi-stable in its noise properties. This thing is busted; we're now removing it from the PSL so that it doesn' light it self on fire.

http://i.dailymail.co.uk/i/pix/2017/01/23/22/3C6BB70900000578-0-image-a-1_1485211840229.jpg

  12790   Thu Feb 2 17:43:20 2017 gautamUpdatePEMEM172 mic is hooked up in the PSL

I had noticed something wonky with the microphone, but neglected to elog it. I had tested it after installation by playing a sine wave from my laptop and looking at the signal on the PSL table, it worked fine. But you can see in the attached minute trend plot that the signal characteristics changed abruptly ~half a day after installation, and never quite recovered.\

 

  12836   Fri Feb 17 10:56:12 2017 steveUpdatePEMparticle counter moved into PSL enclousure

The MET#1 particle counter was moved from CES wall at ITMX to PSL enclousure south west corner at 11am.

The HEPA filter speed at the Variac was turned down to 20V from 40

This counter pumps air for 1 minute in every 20 minutes. Soft foam in bags used to minimize this shaking as it is clamped.

 

  12841   Tue Feb 21 10:08:35 2017 steveUpdatePEMnoisy morning

Our new janitor Francisco is started working in IFO room today.

Quote:

The MET#1 particle counter was moved from CES wall at ITMX to PSL enclousure south west corner at 11am.

The HEPA filter speed at the Variac was turned down to 20V from 40

This counter pumps air for 1 minute in every 20 minutes. Soft foam in bags used to minimize this shaking as it is clamped.

 

Large film crews are working just out side  the north west corner of the lab. They started around ~ 5:30am  Do not plan on working late tonight.

ETMX sus damping restored.

C1:PSL-FSS_RMTEMP, C1:PSL-PMC_PMCTRANSPD and C1:PEM-count_temp channels are not reading since Friday

 

  12844   Wed Feb 22 08:54:17 2017 steveUpdatePEM PSL enclousure particle count

ETMX sus damping recovered.  PSL enclousure is dusty at 20V rotation speed. Rainy days as outside condition.

Quote:

The MET#1 particle counter was moved from CES wall at ITMX to PSL enclousure south west corner at 11am.

The HEPA filter speed at the Variac was turned down to 20V from 40

This counter pumps air for 1 minute in every 20 minutes. Soft foam in bags used to minimize this shaking as it is clamped.

 

 

  12855   Tue Feb 28 08:04:48 2017 steveUpdatePEMETMX damping recovered

ETMX sus damping recovered.

Note: The giant metal garbage container was moved from the south west corner of CES months ago.

Quote:

ETMX sus damping recovered.  PSL enclousure is dusty at 20V rotation speed. Rainy days as outside condition.

 

 

  12856   Tue Feb 28 18:25:22 2017 ranaUpdatePEMETMX damping recovered

Huh? So should we ask them to put the container back? Or do you have some other theory about ETMX tripping that is not garbage related?

Quote:

ETMX sus damping recovered.

Note: The giant metal garbage container was moved from the south west corner of CES months ago.

 

  12884   Mon Mar 13 16:47:41 2017 SteveUpdatePEMY-arm air conditon belts replaced

The east end AC unit is arching over and running rough at CES. Called for mechanic.......

Both belts were replaced and the unit is running happily.

  12895   Mon Mar 20 17:12:08 2017 steveUpdatePEMparticle counter inside of PSL enclousure

The logging script is multiplying by 100 instead of 10 !

Quote:

The MET#1 particle counter was moved from CES wall at ITMX to PSL enclousure south west corner at 11am.

The HEPA filter speed at the Variac was turned down to 20V from 40

This counter pumps air for 1 minute in every 20 minutes. Soft foam in bags used to minimize this shaking as it is clamped.

 

 

  12908   Mon Mar 27 15:36:27 2017 SteveUpdatePEMparticle counter inside of PSL enclousure

 

Quote:

The logging script is multiplying by 100 instead of 10 !

Quote:

The MET#1 particle counter was moved from CES wall at ITMX to PSL enclousure south west corner at 11am.

The HEPA filter speed at the Variac was turned down to 20V from 40

This counter pumps air for 1 minute in every 20 minutes. Soft foam in bags used to minimize this shaking as it is clamped.

 

 

Some one turned up the PSL HEPA rotation voltage from 20 V to 33 ( 120V Variac ) and  X-arm AC set temp lowered to 68F

Effects at 12" height from optical table :

                                                            1.0, 0.5 & 0.3 micron particle count  goes to zero and temperature fluctuaion increased

Rotation speed voltage was set to 30V

                                                            

  12909   Mon Mar 27 16:01:55 2017 SteveUpdatePEMX arm AC set to 68F

 

The X arm air conditioner was not regulating properly. The arm temp was warmer than usual. I requested thermistor calibration.

The mechanic reset the thermostate to 68F last week.  It was 70-71F before.

 

The ETMX oplev laser now running 4 C lower at 30 C inside the enclousure.

The ETMX optical table top is 5 C cooler  at 21 C

The ETMX concrete wall temp 20 C at 9am with flow bench on.

ETMY conrete wall  temp 23 C at 9am

  12930   Thu Apr 6 15:35:44 2017 SteveUpdatePEM envioirmental noise

Building:         Central Engineering Services

     

Date:             Monday, 04/10/17          

          

Time:             7:00 AM TO 9:00 AM           

 

Notification:     Crane Activity

    

Contact:          Ben Smith, X-4190 Brad Nielsen, X-8751

 

Contractors will be removing the large vaporizer located on the South

side of CES. Vehicle access will be restricted due to crane placement

and operation, but there will be a single traffic lane available. This

work may create minor noise and vibrations.  

  13046   Wed Jun 7 10:07:00 2017 SteveUpdatePEMair condition thermostate

The Y arm ac thermostate was calibrated after cooling water relay replacement by Mike.... yesterday. The set temp is remaind to be 70F

The east end south wall temp is reading 22C

  13183   Thu Aug 10 14:13:23 2017 KiraSummaryPEMtemperature sensor

Goal is to build a temperature sensor accurate to 1 mK. Schematic is shown below. This does not take into account the DC gain that occurs.

Parts that would be used for this: LM317 regulator, AD592 temperature transducer, OP amp (low input noise and high impedance), 100K (or maybe 10k) resistor. This is what is currently proposed, but the exact parts we use could be changed to better fit the sensor. The resistor and the OP amp will be decided depending on the output of the AD592.

Once this is built, I would like to create a few copies of it and put them into an insulated container and measure the output from each one. This would allow us to calculate the temperature noise of the circuit, as we can take out the variations due to temperature changes inside the container by comparing the outputs.

I can also model the noise in the circuit to see how much noise there is before building it. There are three terms to the noise that we have, and we need to decide which one dominates at low frequencies.

Our final goal is to create an additional circuit that could cancel out the DC gain. I have attached an additional schematic proposed by Rana that would help with this issue. I will leave this second half for when the first part works.

  13184   Thu Aug 10 14:14:17 2017 KiraUpdatePEMpreviously built temp sensor

I decided to see what was inside the sensor that had been previously made. According to elog 1102, the temperature sensor is LM34, the specs of which can be found here:

http://www.ti.com/lit/ds/symlink/lm34.pdf

The wiring of this sensor confused me, as it appears that the +Vs end (white) connects to the input, but both the ground (left) and the Vout (middle) pins are connected to the box itself. I don't see how the signal can be read.

  13188   Thu Aug 10 21:22:06 2017 ranaSummaryPEMtemperature sensor
  • Should we use the AD590 or the AD592? They're sort of the same, but have slightly different packages and specs.
  • Given the sensitivity of the AD590 to power supply drift, I would recommend using a precision voltage reference like the AD581 or AD587. Take a look at the datasheets and order a few different varieties so we can see what works best for us. I believe that the voltage regulators have too much drift to use for precision temperature control.
  • The AD590 datasheet has a few example circuits showing how we can subtract off the offset which comes the 1 uA/K coefficient of the AD590 (i.e. we would have 295 uA at room temperature, trying to stabilize to +/- 0.1 K)
  • For the first prototypes its fine to use some solderable protoboard assembly, but we will eventually have to figure out how to package this thing and interface it with our Acromag slow controls system.

also, I've attached some temperature noise spectra from the LISA group at the AEI in Hannover. It will be interesting to see if we get the same results.

  13190   Fri Aug 11 10:27:49 2017 KiraUpdatePEMtemperature sensor

Since there seems to be little difference between AD590 and AD592, I guess we could just go with the AD590. The temperature noise spectrum in the first graph are for the AD590, so if we want to reproduce those results, we should use AD590.

For the AD581/AD587, we could go with a few varieties that have the least output voltage drift, although I am not sure what precision we will need. So maybe we could try AD587U and AD581L. We could also try AD587K and AD581K and see if those work as well.

We will also need to calibrate the sensor, as it takes an input of 5V, but the AD581/AD587 provides 10V, which will give about a 1 degree error according to the datasheet. It does state that this is only a calibration error, so it shouldn't be too much of an issue.

I will figure out the packaging once I construct the sensor and verify that it works. Maybe we could use a box similar to the existing sensor, but it depends on the size of the finished circuit.

  13191   Fri Aug 11 10:48:39 2017 KiraUpdatePEMtemperature sensor

Quick update: we actually have AD587KRZ and AD592, so we could start by using that and seeing how it works.

  13193   Fri Aug 11 11:56:02 2017 ranaUpdatePEMtemperature sensor

Might as well order several of a few different varieties today. Its good to have some extra in stock; we don't always want to have to wait days for parts to show up. If you give Steve a list of parts to buy he can order them today or Monday.

There should also be some precision 5V sources (e.g. AD586) that you can try.

ELOG V3.1.3-