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. T

    Space probe between the earth and moon

    Homework Statement The mass of the Earth is Me and the mass of the Moon is Mm. The (center to center) Earth to moon distance is d. a) If a space probe is sent directly from the Earth to the moon, how far from the center of the Earth would the net gravitational force (due to the Earth and...
  2. B

    Doppler Shift: Communication from a Space Probe

    Homework Statement Space probes communicate with controllers on Earth using radio waves. Suppose a probe has a radio-transmitter that operates at a frequency of 516.0 MHz when at rest relative to the observer. This probe is now wandering the solar system. The signal you pick up from the probe...
  3. H

    Misc. DIY Moon Probe: Is It Possible with a Small Budget?

    With a small budget would it be possible to make a rocket capable of delivering a small probe to the moon? A rocket that puts the probe into Earth orbit and them Hoffman transfer to the moon and guides itself to the surface? I am talking very small, maybe the size of a baseball, that...
  4. N

    How Do You Calculate Slingshot Maneuver Dynamics for a Space Probe?

    Really need help with this past exam question for revison: Homework Statement A probe performs slingshot maoeuvre around planet. Mass of planet is 9x10^22kg. Mass of probe is 4x10^2 kg and approaches planet from a great distance with relative speed 2x10^3 m/s and impact parameter 6x10^7...
  5. G

    Oscilloscope probe principals

    As far as I understand the problem is, because of inner capacitance of an oscilloscope, if we apply a rectangular signal on the screen we will see semi-sinusoidal one, and we want to handle this capacitance, that the scope shows correct signal. Right? When we use a probe the circuit looks...
  6. J

    How to Design a Gas Sampling Probe for Varying Exhaust Gas in a Brick Catalyst?

    I want to sample exhaust gas just behind a Catalyst. The problem being the gas varies across the area of the brick so a normal sample probe could read high or low. The general idea is to use a tube with holes in across the area of the brick, however I'm not sure what size to make the holes as...
  7. Z

    NASA Solar Probe Plus to hit 0.067% of c

    In 2018, NASA will launch "Solar Probe Plus" in an orbit that will swing by close to the sun. It is expected to reach speeds as high as 450,000 mph (0.067 percent the speed of light). At what speed would you (if you were inside the spacecraft ) start to see relativistic effects inside the...
  8. Rlam90

    Neutrinos to probe nuclear structure?

    Do you think it would be possible to use a beam of neutrinos to probe the structure of atomic nuclei? Since they do not interact electronically, they would be useful to study the structure of both neutrons and protons, either through gravitational deflection or weak interactions. Could this...
  9. L

    Change in Momentum of probe Problem

    Homework Statement In July 2005, NASA's "Deep Impact" mission crashed a 372-kg probe directly onto the surface of the comet Tempel 1, hitting the surface at 37000 km/h. The original speed of the comet at that time was about 40000 km/h, and its mass was estimated to be in the range (0.10-2.5)...
  10. K

    Calculating Space Probe Speed for Escape Velocity

    At what speed should a space probe be fired from the Earth if it is required to still be traveling at a speed of 3.88 km/s, even after coasting to an exceedingly great distance from the planet (a distance that is essentially infinite)? V(escape)= √(2GM/R) M= mass of Earth, R= radius of Earth...
  11. T

    Anode erosion of a moisture probe

    I'm working on a project in which I'm using a basic moisture sensor that I've made by sliding an insulated wire inside of a copper tube in such a way that the insulated wire with it's insulation extends past the tube about 1/8". That is then poked into the ground. On the other end of the copper...
  12. C

    Accelerator size and probe scale relationship?

    Wondering if anyone has developed a scaling heuristic for the relationship between size of accelerator and smallest size that can be probed with it. With so many data points, something ought to emerge, perhaps a modified power law. Adding a time axis could make a Moore's "law" projection for...
  13. dbmorpher

    SR Effects on Interstellar Probe: Can Messages Return in 50 Years?

    If a probe is sent to the Tau Ceti system and does not accelerate outside the solar system (keeps a constant velocity when passing the heliosphere) will it not experience relitivistic effects? Could it then send a message back to Earth in 50 years for us?
  14. N

    How close does a spacecraft get to Tethys during a mission?

    How high is usually the probe above the surface of the cosmic body? It would be best if it was specifically the Tethys, but suffice average. Thanks and sorry for my bad English.
  15. N

    Which Celestial Body in the Solar System Allows a Probe to Orbit Fastest?

    Hello. In my book with examples of astronomy, I found this: Calculate, around which the known celestial bodies in the solar system (with a diameter greater than 1000 km) do a probe one complete cycle fastest (without the use of engines). Other movements of these bodies is negligible. If...
  16. P

    Four point probe conductivity

    I am new to this field of electrical measurements and my question may sound amateurish but your suggestions will be highly appreciated. I have got a micron thick polymer sample with some kind of irregular shape. I mean with each sample the shape is being changed little bit as the shape is not...
  17. D

    Gravity Probe B and Our 4-Dimensional World: Does Time Stand Still?

    Do the Gravity Probe B results provided by NASA from 2011 support and lean in favor of a 4-dimensional everyday world? The world you and I live in. Do the results argue for block time?
  18. E

    Working of a calibrated hall probe

    i am not able to understand what IS exactly a hall probe and how it works. also how do we calibrate a hall probe? anyone please help!
  19. D

    Building a Langmuir Probe: Seeking Driver Circuit Help

    I am going to make a langmuir probe but I have heard there is a circuit for that, is there any circuit for driver of the probe? any help would be appreciated.
  20. O

    Estimating Error in Meas. of Homog. Mag Field w/ Hall Effect Probe

    Homework Statement I'm trying to estimate the error in measurements of a homogenous magnetic field of known orientation using a Gauss-meter that uses a Hall-effect probe. The uncertainty in the measurements reported by the Gauss-meter are given the user's manual. Since the probe is held by...
  21. B

    Physics Lab Questions: Rubber Band & Force Probe

    Okay, I am working on my physics lab, and I have a few questions regarding it. First, we are asked to make a prediction: "Predict how you think the presence of a rubber band will affect the force felt by the force probe from the rubber band compared to masses hung directly from the hook?" My...
  22. T

    Could an ~12ft rocket launch some sort of probe into space

    could a large 12ft model rocket be used to launch a probe into space, such as a telescope?
  23. S

    Mission to Probe the Universe's Darkest Secrets

    http://phys.org/news/2012-06-mission-go-ahead-probe-universe-darkest.html So what reasonable expectation can we have from this mission?
  24. 1

    Kinetic energy of space probe launched from planet

    Homework Statement Zero, a hypothetical planet, has a mass of 3.0 x 10^23 kg, a radius of 3.0 x 10^6 m, and no atmosphere. A 17 kg space probe is to be launched vertically from its surface. If the probe is launched with an initial kinetic energy of 5.0 x 10^7 J, what will be its kinetic...
  25. D

    Calculating resistance of an oxygen probe

    I have an oxygen probe that produces a millivolt reading once it reaches 1500F based on the parts per million of oxygen in a heat treating furnace. The life remaining in the probe can be estimated by the resistance it inherently has at this temperature. A new probe has about 10-15K Ohms and...
  26. M

    Extract the laser from a mouse and use it for construction of a probe

    Background I am currently doing a project that requires me to construct a probe which dentists use to transmit laser light to a patient's teeth to determine if the teeth is vital or not. Wanna know if it is feasible for me to extract the laser from an optical mouse and use it to construct...
  27. S

    Do we want to sent probe to Newly discovered planet 'Kepler-22b' now?

    what you think, do we want to sent probe to Newly discovered planet 'Kepler-22b' now?. the data may be useful after may be a millinium later since it is 600 light years far away. still it is better now than later, right? or may be we want to wait for quantum entanglement in quantum information...
  28. E

    Gravity Probe B / precession question

    I've been reading up on gravity probe B and the results, but I have a question about precession in general - I've heard it said that since the gyroscopes are in free fall there is no classical precession to be expected. So then, what explanation was there for Earth's precession before...
  29. H_man

    Oscilloscope probe resonantly picking up 50Hz

    Hi all, I've noted for years that oscilloscope probes tend to pick up noise from AC power cables, but just recently I tried connecting an antenna (piece of wire) to the probe and placing it near some power cables and voltage recorded was off the scale. I have calculated that the power...
  30. A

    Knowledge required for a research project using Kelvin Probe

    Alright so a professor took me up for a research project which makes use of a Kelvin Probe. However I only have a year of introductory Physics under my belt (Mechanics and Waves & Oscillations). I started studying some of E&M which I assumed I needed to know, this summer but didn't get too far...
  31. S

    Calculating Resistivity of Extrinsic Ge w/ Four Probe Method

    We have an experiment of the students to calculate the resistivity of an extrinsic (p or n) Germanium sample using Four Probe method at different temperatures (the sample is heated from room temperature and the voltage and current are measured for increasing temperature and then the same is done...
  32. R

    Matching a probe to my oscilloscope (15mhz)

    Hey all. As the title states, I have an analog oscilloscope with a bandwidth of 15MHz. I am in the market for a probe and have noticed a good deal of them to be in the triple digits. Long story short, I've come across a quality probe kit that consists of 150MHz rated probes. Thus my question...
  33. marcus

    Gravity Probe B press conf. 4 May (any surprises? comment?)

    Apparently NASA announced final results of GP-B today, with a bit of fanfare: http://science.nasa.gov/science-news/science-at-nasa/2011/04may_epic/ Has anyone seen a final report? All I saw that's new is the press release. Here is a nice pedagogical background piece from 2008...
  34. L

    Space Probe vs the Sun - Relativistic Frames of Reference

    I've had a good search through the archives and haven't found an answer to this question. Many apologies if this is old ground. . . Having read the threads on the Pioneer Anomaly a quick question to which I'm sure there is very simple answer (I just don't know what it is !): When...
  35. A

    Circuit: Water Sensor: Works when one probe is in water while the other is not

    Hi, just wondering how I could make a circuit so that it would only work when one water sensor if touching water while the other isn't. Here's a quick http://i539.photobucket.com/albums/ff356/AnneFTW/Random/WaterPump.png" and replace the buzzer with a pump, but how do I use probes with two with...
  36. Y

    How does a calibrated Hall Probe work?

    I'm supposed to plan an experiment using a calibrated hall probe to investigate the relationship between Magnetic field strength (B) of a coil and the distance (x) from the centre of the coil. I'm supposed to be able to take direct readings from the calibrated hall probe to calculate B, but how...
  37. M

    Measuring Ion Temperature in Plasma: Why Use Tungsten/Molybdenum Probes?

    I am nt able to understand why we are not able to measure ion temperature in plasma using single probe method ? Why tungsten or molybednum probes are used ? The book says due to their refractory properties but i am nt getting it . TO mod , i didnt find a plasma related section so...
  38. C

    Misure magmetic field by hakìll probe

    Hi to all experts forums... I can ask you the follow question or problem... I determine the magnetic field on one ferromagnetic piece by hall probe meter...The magnetization of this piece is longitudinal and the tipology of current is alternative current and set up the istrument on AC...The...
  39. V

    1X or 10X Passive Voltage Probe?

    Hi All, Suppose you have applied 800kHz, 30ppV sine signal (from a pulse generator) to a 115pF, 10Ohm RC circuit and you want to know the value of the applied voltage as accurate as possible what passive voltage probe would you use, 1X or 10X? Is there a way to check the accuracy of the two...
  40. W

    How to probe the group SU(2) is simply connected?

    why group SO(3) is not any good reference on the relation of SU(2) and SO(3)?
  41. S

    Metal Detector Probe: Find Iron Rod in Concrete Walls

    Hi guys, I am working on a Automation project and I am wondering whether there is any probe that can emit signal to a standard PLC when iron rod is found inside a concrete wall. Personally, I hope it can be avaliable from RS. Thanks for your kind help in advence.
  42. A

    Could We Send a Probe to Alpha Centauri with Current Technology?

    I Have read a lot recently about Alpha centuri having a planet that's identical to earth. i qquote On January 15, 2010, a team of astronomers released the results of computer simulations indicating that kilometer-size planetesimals can form and accrete into rocky Earth-size planets around...
  43. T

    Why is my clock signal overshooting when using a 10x probe?

    I'm working on a microcontroller project where I'm sending out a clock signal at 153kHz and then converting it to 0 to 12V levels using a n-channel MOSFET. The wires are approximately 2 feet long after the conversion. I was disturbed by the excessive overshoot I was seeing on my USB scope. I...
  44. R

    Space probe to Proxima Centauri

    Can we send a space probe to Proxima Centauri?
  45. P

    Thermocouple Probe Selection

    Hey guys, First post so be nice :smile: I am building a system to measure the temperature of water in a tank. I will be using a thermocouple probe inside a thermowell. My very crude diagram shows the set-up; The temperature range is obviously 0-100 degC which seems to fall into...
  46. S

    Has Gravity Probe B proved framed dragging

    I know other experiments have brought back conclusive evidence on frame dragging, but has gravity probe B? Links welcome!
  47. I

    Solving a Robot Probe Homework Problem on Mars

    Homework Statement a robot probe drops a camara off the rim of a 239 m high cliff on mars, where the freefall acceleration is -3.7 m/s^2. a. fiind the velocity wl which the camara hits the ground. b. find the tiime required for it to hit the ground. Homework Equations vf^2= vi^2+2ad...
  48. K

    Why is a probe field necessary in pump-probe experiments?

    In many paper or book on laser, it is quite oftern to mention the pump and probe field. I understand what the pump field is, but what about the probe field? What we need a probe field? How does it work (how to "probe")? And why a probe field is always a weak field?
  49. A

    Probe Holder/Stand for Crystal Disc in Vacuum Chamber

    I am currently having a bit of trouble on my design. If you have any ideas please let me know. I have a crystal disc that is held horizontal above the chamber. It is a vacuum chamber, that is less than a foot in length. [crystal] <--(force){probes} I'm trying to have two probes contact...
  50. T

    Hysteresis in Hall Probe Calibration Curve

    Hysteresis loop in probe?? Hello guys, I have done the Magneto-optical Kerr effect experiment, studying the hysteresis loop over some pieces of ferro- and ferri-magnetic pieces of metals (CDs and MiniCDs). The problem is the following, we first started by creating the calibration curve...
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