Normal 6531 crosstalk?

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• CROSSTALK in NI 9215 signals

  I currently use a NI 9215 module with BNC terminals to read the outputs of two different types of voltage sensors.  Probe is a probe differential o-scope (Tektronix P5200A) which has a rejection of sound very good, while sensor B is a shunt isolated hall effect measurement using a LEM lv20-P and a custom PCB, which has a considerably lower noise rejection.  Noise in the circuit to be measured is mainly the result of a H-bridge Inverter circuit that goes to 10 kHz.  A picture of two sensors measuring the same signal displayed an o-scope is shown below with the sensor signal on top and B sensor on the bottom.

  

  As you can see there is a lot of noise in the B sensor while sensor A is most often silent.  When I connect then both of these signals to my NI 9215 I get the signals shown below (75 kHz sampling rate), sensor A appears in white and green B sensor (ignore the differences in scale, it's programmatically).

  
  As you can see the noise level in the two now is comparably high.  However if disconnect us the 9215 B, the signal from the probe sensor then replaces the image below:

  

  Although there are some present noise, the signal is much cleaner than before.  The natural conclusion that I draw from this is that there is significant interference between the two signals.  The same wiring is used for connecting to the 9215 as o-scope, and the two sensors use shielded twisted pair cables.  This amount of crosstalk seems very high compared to the - 80dB listed in the specifications of the 9215.  Any ideas what could be the cause, or how to fix it?  Unfortunately, I am currently unable to afford a second sensor A.

  1. by the impulses of the runt, I was meaning extremely short pulses on A sensor. If they are short enough, you will not see them unless you are looking for.

  2. my concern is whether the switching noise is contaminant entering your power supply through the electric wiring. Of course, good feeds should filter this point, but it's just another thing to check.

  3. the quick and dirty way would be to use a BNC T-connector to connect the oscilloscope and the ground in this way.

  Suggestion of ferrite chokes on instrumentation Henrik is a good.

  I understand that this type of inverter using the load (normally three-phase current motor alternative) to filter the frequency of bridge (10 kHz in your case) to the required frequency (normally 50 - 60 Hz). This means that high frequency currents go all the way to the motor, if they are not filtered by the cables first. You can not just screen the housing of the inverter, because the currents of high frequency down to load part of its operation. If you start testing things, you will all the way from the inverter to the load of the screen and will be impossible to Rodez to meet your instrumentation.

  Standard WARNING: If you are tempted to connect directly to the UPS output and reduce until the input voltage range 9215: first of all, make sure that a qualified person has verified your wiring. Second place of fuses in all lines near where the tension is taken offshore. A UPS maybe a current loophole in the beach A 100 and you don't want that to the bottom of your wiring of instrumentation. Not directly relevant to your ad, but I feel that I specify.

• I have an iPhone 6 more, an official version of China, it shows a battery indicator when I turn off support, is this normal? I can depulicate this function to another iPhone? I know how?

  I have an iPhone 6 more, an official version of China, it shows a battery indicator when I turn off support, is this normal? I can depulicate this function to another iPhone? I know how?

  I remember reading somewhere on the Apple site in recent years on some models of Chinese iPhone with this capability. No other iPhones display this and there is no way to enable it. I can't find the article which includes this information.

• Something is wrong! Start in safe mode, but it turns out that for Normal mode.

  Mac Mini (late 2014)

  Processor 3 GHz Intel Core i7

  16GB 1600 MHz DDR3 memory

  Start drive Macintosh HD

  Iris 1536 MB Intel graphics card

  Monitor: DELL U2713HM, use the Apple adapter to connect to the Mac Mini

  I upgraded from Capitan in Sierra and got the problem that after I pressed the power button, the screen is full white. This problem has occurred on the Sierra, never happened in Capitan.

  I went to the Apple store today, they made a few diagnostic and found no problem. Everything is good. System is fine too. In the Apple store, they showed me to press SHIFT after I press the power button and it will start up the Mac in safe mode. They told me this can sometimes help fixing the boot issue. My Mac actually works very well in the Apple store. I tried the power and turned off twice in the store, and there is no problem. I am happy and come home.

  After I go home, I turn on my Mac, it always has the same problem before you go to the Apple store, after I pressed the power button, the screen is completely blank. So I tried to boot mode safe by pressing Shift and taking until I saw the Apple logo on the screen.

  After I log in, I checked my Mac mode, this is actually Normal mode!

  If I intended to power to the top of my Mac in safe mode but it turns out to be normal.

  If I do not press SHIFT and hold it pressed down after I turn on the power, I'll have just a white screen!

  It works very well in Apple store, but not in my own House.

  Anyone know what is happening?

  What is different between your system and the store? Have you taken your own keyboard & they were they that? If you use a bluetooth keyboard try using a wired USB one instead. Is this an original Apple keyboard?

  Do you have other devices connected? If you delete them.

  Please see the article below from Apple, it has information about starting in safe mode without keyboard (by setting a NVRAM variable). If you enter a work boot, you can put the mini in safe mode from there, via the command appears on this page...

  Try safe mode if your Mac does not end commissioning - Apple Support

  I would like to start trying to make another bootable OS disc - either an installation disc or a complete operating system to see if the Mac can be started OK to a different installation of OS - which indicates if the operating system or disk are part of your question, or if the material is simply unable to work correctly at all.

• Is it normal to have bubbles in glass

  Hi all

  is it normal to have a small balls of glass dipped in my iPad?

  Thank you

  Yannick

  You should not have any liquid or pockets of air under the glass.

  It is above the glass, you can clean off the coast

  Cleaning of your Apple - Apple Support products

  otherwise, you can contact apple and see if the device can be considered by their service.

• The new iPhone 7, display lights on the move - is this normal?

  I just bought an iPhone 7.  Whenever I pick it up the screen lights up before I hit the home button.  Is this normal?

  I guess that when I'm carrying it, it will keep light upward, and then jump.

  Yes, it is a new feature in iOS 10 called "Raising to wake", where you can check the notifications on the lockscreen without hitting the power button / stop or the "home" button.  I don't know if I like it or not, but I currently have always it turned on.

  To disable this option, go to settings, display and brightness and toggle the revival to Wake OFF.

  I played around with it a bit, and it activates especially when moved from horizontal to vertical (for example pick up placed on a desk), but no say, low vertical, high portrait.  So depending on how you wear the phone (pants pocket, Pocket jacket, holster, backpack, etc.), it may or may not turn on unintentionally.

• Is 6200 RPM under normal conditions of Macbook Pro?

  Hi all

  Greetings for the day...

  Normally, I do not play games and it was the first time, I downloaded Dirt 3 on my MacBook Pro model no of retina and noticed that during the game, temp has risen about 75 and the fan speed was so fast it was audible. As I SCM fan control, I just checked my fan speed, he looked at 6200 rpm, is - it normal like playing games or is there any concern that I need to worry?

  Thanks for your help... Bravo!

  Games often is resources intensive applications and will focus on the CPU/GPU to create heat.  What you are experiencing seems to be normal.  Fans will accelerate in order to dissipate the heat, so the speed of 6200 RPM is not unusual.  temperature of 75 ° c, but on the high side, is well below the limits of functioning "normal" for the resource intensive applications.

  According to the parameters that you said, there is nothing unusual.

  Ciao.

• drain battery MacBook or normal?

  I bought a macbook 12 "retina display earlier this year. I use it only once every three weeks or more. I usually load completely before I have unplug the unit and it is sitting for three weeks and when I turn it on it has lost about 30% of its power, according to the percentage at the top battery icon. Is it normal for a fully charged battery to sink down when not in use? (I ran a diagnostic test Apple and all removed). Useful tips on this are appreciated. Thank you-

  I can't speak for your machine, but the MacBook Air 11 '' works with a lithium battery much smaller than, say a 13 "MacBook Pro. Losing 30% of the load over several weeks is in the normal range.

  Useful tips? I think you're doing everything right. I guess you power off your machine before unplugging; I saythat as some users choose to sleep their machines rather than turn it off.

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  I'm not sure if a Apple Watch nike + a normal faces? I could not find nike nike faces a worldwide Apple Watch.

  Hello

  Apple Watch Nike + features Nike exclusive watch faces as well as all the standard watch faces. It also has tight integration with the Nike + Run Club application. For example, "run" will start a race in the app Nike +.

  Other models Apple Watch series 2 or have the same characteristics of internal material and offer the same standard features of the watch OS 3. The Nike + Run Club app can also be installed on them, but the exclusive Nike watch faces can be added.

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  http://www.Nike.com/us/en_US/c/Nike-Plus/Apple-watch

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  http://www.Apple.com/Apple-Events/September-2016/ (view from 45 minutes, 30 seconds)

• What are the normal batteries fresh cycle when buying a used macbook pro

  Hello

  Looking to buy a macbook pro 2014, battery life is important enough and the machine, that I'm looking seems really well taken care of but the battery charge cycle is 300. Is this ok or normal? I don't like the idea that it is a third of the used way!

  Regardless of the number of cycles a battery has gone through, replace the battery with five years of service.  Age is a factor in the health of a lithium-ion battery.

  Assuming a battery will last in its setting of 1000 cycles design (most don't) suggests that 200 cycles per year would be realistic.  The MBP you are considering have 300 cycles seems to be quite normal given his age.  I wouldn't worry.

  Ciao.

• The apple logo appears after login and suddenly return. Is this normal?

  The flow rate is:

  1. connection of the screen and choose user login
  2. Enter the password and press the arrow to open a session
  3. under the password field progress bar
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  Is it normal to see the screen of the logo apple here, because previous OSX login did not have it and the connection process is faster.

  Hi Tommy,.

  You have 2 FileVault enabled on your machine to encrypt your drive? If so, which is why you see the progress bar after you enter your password.

  With FileVault2 enabled the recovery partitition machine to manage the connection at startup then normally starts after the successful login.

• Suddenly, I noticed that I have to do a larger than normal pressure on the bead of the mac book pro-retine to get an answer to the deeper click. How can I do?

  Suddenly, I noticed I do higher than the normal pressure on the pad of my Mac Book Pro 15 "retina to get a response to my deepest click. How can I do? Thank you.

  Carlo

  Which MacBook Pro model?

  This is the Office Mac Pro forum. I asked that your post be moved to the MacBook Pro laptop forum.

• on the Iphone 7. How to listen to music, if we have a normal headset and charge at the same time?

  How to listen to music, if we have a normal headset and charge at the same time?

  < re-titled by host >

  It sopposed must be a wireless charging dock to be launched shortly if the dock does not so it is a disappointment

• How long does normally take to access the screen with update or restore?

  How long normally takes to get to the restore or update the window when the need to enter an Ipad handicapped?

  If you say that you see that you can not try your access code new for X number of minutes on your iPad, you will never see the restoration on the device window. You have to connect to iTunes to restore it, or use iCloud to erase it.

• My iPhone6 has convinced himself that he has a helmet connected - how can I convince otherwise and return to the normal setting?

  My iPhone6 has convinced himself that he has a helmet connected - how can I convince otherwise and return to the normal setting?  I tried turning it off and back on after awhile, but did not.

  Double check with a magnifying glass and a good lighting that nothing has been slain. Then, try insertion and withdrawal of your headphones a couple of times. If this does not work, it may be while the shooting went wrong. In this case, make an appointment at the Genius Bar at your local Apple store for the assessment.