What is Probe: Definition and 161 Discussions

A test probe is a physical device used to connect electronic test equipment to a device under test (DUT). Test probes range from very simple, robust devices to complex probes that are sophisticated, expensive, and fragile. Specific types include test prods, oscilloscope probes and current probes. A test probe is often supplied as a test lead, which includes the probe, cable and terminating connector.

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  1. S

    Sending a probe to the Earth's core?

    Will we ever be able to actually send a probe to the Earth's core?
  2. A

    The probe passes over an atom that is 3.20×10^2 nm tall.

    The probe passes over an atom that is 3.20×10^2 nm "tall." The probe passes over an atom that is 3.20×10^2 nm "tall." By what factor does the tunneling current increase?
  3. P

    Exploring SPM and STM: How to Probe a Sample without Touching

    How on Earth do 'they' get a probe that close to a sample in SPM without it touching (in STM) or at just the right controlled amount?
  4. R

    Advantages of four probe method

    how does contact resistance and sprearding resistance gets in eliminated in four probe technique for measuring resistivity in comparison to two probe technique where we encounter these resistances?
  5. S

    Thesis Help Sound Intensity Probe.

    Thesis Help! Sound Intensity Probe. My final year thesis is to implement a sound intensity probe in MATLAB using two conventional microphones. Using these microphones, i can make recordings of audio to analyse in MATLAB, with the main aim to locate the sound from the phase information, and to...
  6. B

    How Far Should the Voltmeter Probe Be Placed to Read 195V?

    Homework Statement A very long insulating cylinder of charge of radius 2.70cm carries a uniform linear density of 16.0 nC/m Question: If you put one probe of a voltmeter at the surface, how far from the surface must the other probe be placed so that the voltmeter reads 195 ? Relevant...
  7. jal

    Investigating Heavy-Ion Collisions to Probe QCD

    “Teaching aids” The moderators and Gurus might want some recent “teaching aids”. Perhaps you will want to put some of these into a "sticky" The CERN site is producing some very good “teaching aids”. If you can, look at the ppt presentation, since it has animations. There are 3 pdf files at...
  8. U

    Should we send interstellar probe to Alpha Centauri?

    Should we send an interstellar (unmanned) probe to Alpha Centauri? Would it be much more expensive than a manned mission to Mars? According to Wikipedia, velocities as high as 0.10c are possible with hydrogen bombs. That means that ~40 years flight time to the nearest star would be possible...
  9. B

    Why is a space probe spinning around its own axes, when flying through space?

    Why is a space probe spinning around its own axes, when flying through space?
  10. P

    Four Point Probe Measurement Help for 500 nm Ni Coating

    Hi, I am new to four point probe measurements and I have a question. I've deposited 500 nm of Ni on glass substrate to check out the equipment we bought. When I measured its sheet resistance the display showed 13.56 mohm/sqare for 5 mA current. To check out the measurement I multiplied...
  11. wolram

    Did Gravity Probe B Fail to Meet Its Goals in NASA Review?

    http://space.newscientist.com/article/dn13938-gravity-probe-b-scores-f-in-nasa-review.html The noisy data meant that GPB could not measure the effects as precisely as astronomers had by firing laser beams at mirrors left on the Moon by the Apollo astronauts. GPB managers had asked for...
  12. I

    Gravity Probe B and 'frame dragging'

    Am I right in assuming that Gravity Probe B has proved that the rotation of the Earth (@~465metres /sec.) 'swirls' space-time in the same sort of way that a rotating ball will swirl a fluid? I ask because if this is the case, then the forward motion of the Earth (@~360km/sec.) must also...
  13. P

    Hall Probe Voltage Calculation for Conduction Electrons in a Magnetic Field

    Homework Statement Here's the question: http://www.phys.washington.edu/users/schick/322A/322-08ps1.pdf It's problem #2 The Attempt at a Solution Alright, so I got together with a friend and we did the following: I = V/R. For the x-direction flow, we know V and R, so we got...
  14. P

    Measuring pH probe potential and interfacing probe with uC

    I am building an automatic acid-base titrator for my senior project. I am using a Freescale s12ub microcontroller. For this project, I will need to interface a pH probe with the CMOS input on a microcontroller. The potential across the probe is supposedly proportional to pH. (-0.06 volt/pH...
  15. S

    Procedure for calibrating the force probe

    Hi, I need help for 3 questions 1) Describe qualitatively the procedure for calibrating the force probe. 2) when determining the acceleration over a timeinterval, LoggerPro provides the following statistics : Average 0.107 Standard Deviation 0.120 Number of Points 54...
  16. D

    Where Can I Find a Simple Hall Probe for Measuring Magnetic Fields?

    Hey, Sorry this is probably in the wrong section but I couldn't think of a more appropriate one. Anyway, I've spent ages on the net looking for a really simple hall probe - like one which I used back in school measuring a max of upto 1.5 - 2 tesla, and I just cannot seem to find any school...
  17. C

    Kinetic energy of space probe problem

    Homework Statement Planet Zero has a mass of 4.0*10^23 kg and a radius of 2.0*10^6 m . With what kinetic energy should a 10-kg space probe be launched vertically from the surface of Zero so as to achieve a maximum distance of 4.0*10^6 m from Zero's center? The Attempt at a Solution I...
  18. C

    What is the first result on Gravity Probe B?

    What is the first result on Gravity Probe B? Please tell me.
  19. R

    Pspice: derivative function in probe

    Hi Guys, I am stuck at a point and needs help. The thing is I am doing MOSFET inverters using Pspice. I am getting its VTC (voltage characteristic Curve) But I don't know how to get derivative of this curve in order to obtain some parameters required for Noise margin. Here is the file...
  20. B

    Gravitational pull on probe between the Sun and the Earth

    How far from Earth must a space probe be along a line toward the Sun so that the Sun's gravitational pull on the probe balances the Earth's pull? I'm actually just confused as to how to set this up. I know that I need to consider d being the distance from the Earth to the sun and r being the...
  21. F

    Space probe homework problem

    How far from Jupiter must a space probe be along a line toward the Sun so that the Sun's gravitational pull on the probe balances Jupiter's pull? i know that i need to use m1/r2=m2/((2.78e-11)-r)squared but my answers keep coming out wrong. For an answer, i got 2.4e7 km
  22. S

    Impulse Momentum Theorem and space probe

    Hi, I'm kinda lost on these 2 problems. A space probe is traveling in outer space with a momentum that has a magnitude of 7.15 x 107 kg·m/s. A retrorocket is fired to slow down the probe. It applies a force to the probe that has a magnitude of 1.81 x 106 N and a direction opposite to the...
  23. F

    Alternative current to hall probe

    we drive the Hall probe with ac current and measure the voltage with lock-in amplifier but the problem is that after some time the probe does not function(no current passes through it). Hall probe is driven with the alternative current from the sine output of the lock-in and i max is...
  24. D

    NASA Could a giant Rail Gun be the solution to faster space travel?

    :rofl: I've always been impatient when I hear NASA has launched a new probe for some mission. I hate having to wait years to see the mission unfold. But that is the reality of space. I've always wished that NASA had a giant Rail Gun, about a 100 miles long studded with reactors to...
  25. B

    How to probe the homogeneity of the universe ?

    We can probe the isotropy of the universe by observing the universe just from a single place. However, as I know, that is not true for homogeneity. What type of expriments we can carry out on ground or spcae, for probing the homogeneity of the universe.
  26. S

    News Army to Launch Probe Into Tillman Death

    http://www.washingtonpost.com/wp-dyn/content/article/2006/03/04/AR2006030400860.html It's been two years why they just starting to lanuch a crimnal investegation? I don't watch football.But I'am kind of intersted to see what if it was propous what was the motive.
  27. Garth

    Alternative theories being tested by Gravity probe B

    The Gravity Probe B satellite has placed four (over redundant) gyroscopes in low polar Earth orbit to primarily test two predictions of General Relativity. The first effect being tested is (for the GP-B polar orbit) a N-S geodetic precession, caused by the amount a gyro 'leans' over into the...
  28. marcus

    Probe returning with asteroid rock sample

    http://www.guardian.co.uk/science/story/0,3605,1652178,00.html ---quote from Guardian--- Probe returning to Earth after asteroid landing Alok Jha Monday November 28, 2005 The Guardian The Japanese space probe Hayabusa began its journey home yesterday after becoming the first...
  29. P

    Determining density of spherical cloud by dropping probe and measuring velocity

    This is a problem that has been giving me trouble, wondering if I could get some input: A space probe of mass m is dropped into a previously unexplored spherical cloud of gas and dust, and accelerates toward the center of the cloud under the influence of the cloud’s gravity. Measurements...
  30. P

    Gravity Probe B Results: Preliminary Info

    Does anyone have any preliminary, or otherwise, information as to the results of Gravity Probe B?
  31. DaveC426913

    How does a car's temperature probe accurately measure outside temperature?

    I have a display in my car that registers outside temperature. It seems to be accurate even in the most adverse circumstances, such as when parked in a parking lot in the sun for a long time. I feel the temperature standing there well over the hundreds, yet the temp gauge does not seem to be...
  32. P

    Gravity Probe B: Gyroscope Orientation and Precession

    I was looking at some web sites about the Gravity Probe B. Some show the spin axes of the gyroscopes oriented perpendicular to the Earth or else in the direction of movement of the satelite. Wouldn't these orientations cause lots of precession? I'd expect the gyroscopes' axes of rotation to...
  33. M

    Calibrating Hall Probe: Measuring Magnetic Field Strength (B)

    to calibrate a hall probe, i know we have to generate a known magnetic filed strength (B)...but how?? Is there an equation relating the "B" with measurable currents, etc? Thanks for helping guyz!
  34. W

    Calibrating a Hall Probe for Magnetic Flux Density Measurements

    Hi there! I am have to plan an investigation. I have to calibrate a Hall probe to measure magnetic flux density and then investigate how the separation between two bar magnets has an effect on the magnetic flux density. Can anyone help with calibrating a hall probe? I have searched the net...
  35. M

    Measuring Magnetic Field Strength with Hall Probe

    there are two permamnent bar magnets put with a south pole facing a north pole. there is a magnetic field in between the bar magnets. i need to use the hall probe to measure the field strentgh. the probe measures a hall voltage and i can convert this to magnetic field strength values using...
  36. K

    Calibrating a Hall probe (again)

    Ok, like all A2 students I've got this darn planning exp. For the calibration of my Hall probe I have proposed measuring the voltage from two fields of known strength. By using a solenoid (a uniform field) I can use the equation B=Miu n L to work out the flux of the field but have become a...
  37. Astronuc

    Electron Probe Microanalysis (EPMA) - Course Notes

    Those of you who use EPMA or would like to learn about it, check this out. http://jan.ucc.nau.edu/~wittke/Microprobe/Course%20Overview.html
  38. B

    Magnetic flux density and Hall probe

    I'm planning an investigation on how magnetic flux density midway between opposite poles of 2 bar magnets varies with separation of the bar magnets (using a Hall Probe). [simply as shown in attachment] To do this, I'll need to calibrate a hall probe (which I think is done by working out the...
  39. W

    How do you calibrate a hall probe?

    For a planning exercise i have to calibrate a hall probe to measure the magnetic flux density mid-way between opposite poles of two permanent bar magnets. anyone know how to calibrate a hall probe so that i can do this experiment?
  40. J

    LHow does a Hall probe work?

    Where could I find out how a Hall probe works? I have got a book in mind called Introduction to electronics by Theodore Korneff but am not sure how useful it will be. I have searched the web but cannot find a description of its working. :cry: James
  41. M

    Mysterious Creature Spotted by Huygens Probe on Titan

    http://www.fileplace.info/14012005/3697.jpg This creature has been spotted by the Huygens probe in the surface of Titan... :yuck: Now is clear that the next objective of such abject monsters will be the invasion of Earth. I think that I'm going to hide myself in my underground hideaway...
  42. marcus

    Titan Surface Probe: Cassini Flyby & Huygens Descent

    here is an article posted yesterday (Friday) http://www.rednova.com/news/display/?id=96361 what other articles do you have about this? a flyby of Titan by the Cassini craft releasing a small probe, Huygens, intended to parachute to surface (possibly liquid) Cassini will come within...
  43. J

    Protons to accelerate a space probe

    Okay ppl, I have a question, I'd just like you to check that my working here is correct. Q: A space probe of mass m=490kg is driven by an ion propulsion motor that involves the use of positive ions, each of mass m=2.18*10^-25 kg and having a charge of magnitude e=1.6*10^-19 C. These ions...
  44. I

    Strange implications of NASA's Gravity Probe B

    Gravity probe B is designed to detect the distortion of space (both the linear compression and lateral shear of the vacuum) that the mass of the Earth produces by it's presence in space and it's rotation on it's axis. The hope is that this might be seen in the anticipated deflection of very...
  45. Garth

    Has Gravity Probe B been a waste of money?

    After three months in orbit, following its launch on 20 April, Gravity Probe B has now entered its science phase. This success comes after about 40 years of a long saga of planning and construction and three unsuccessful cancellations by NASA in ’89, ’93, and ‘95. The project went through...
  46. denian

    Looking for a Clear Diagram of Hall Probe Structure

    i've look for the picture that shows the structure of HALL PROBE to complete my notes, but fail to find any clear diagram. just hope that if any of you have a clear diagram on Hallprobe, hope can tell me. thanks in advance.
  47. W

    Mars Climate Orbiter probe crashed into the surface of Mars

    In 1998, the Mars Climate Orbiter probe crashed into the surface of Mars, instead of entering orbit. The resulting inquiry revealed that NASA navigators had been making minor course corrections in SI units, whereas the software written by the probe's makers implicitly used British units. The...
  48. B

    Space probe transmiting a pic to Eart

    Im a novice on waves what I want to know is for instance a space probe transmiting a pic to Earth does it use radio waves ? And does it have to transmit in direction of Earth or could we receive pics on another plant and what size area do these waves occupy i.e when they hit Earth does it equate...
  49. V

    Ultra-Low Activity Spectrometric Probes Review

    I am having a reriew about "Ultra-Low activity Spectrometric probes" And it has a picture http://www.web-vn.com/DSCN0969.JPG Figure 4a presents the density log recored in an HQ size exploration hole, using the SIROLOG density pro. Figure 4b shows the result from a log conducted in the...
  50. wolram

    NASA's Gravity Probe B: Detecting Gyro Spin-up Forces of 10 Nano-Newtons

    http://www1.msfc.nasa.gov/NEWSROOM/news/releases/2004/04-142.html At the end of last week, the Gravity Probe B team practiced Low Temperature Bakeout (LTB), in which discs of sintered titanium (very tiny titanium balls, smaller than cake sprinkles) are "warmed up" a few Kelvin, thereby...
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