Calibration Definition and 82 Threads

How did you find PF?: I have been trying desperately to correct a mistake I made when I received my new Zantum Class 0.5 10-15v voltmeter. The 2 screws on the back I thought were for wiring. Sure enough I found out they were calibration screws. I willy nilly began turning them thinking "is this...

I understand that many of the extreme distance objects were incorrectly calibrated for their distance and subsequent age. I have been trying to track down the related articles detailing the error with the applicable mathematics. If anyone knows where I can get the related calibration papers it...

I've wanted to check the accuracy of my Blood Pressure Monitor (BPM) (an automated Omron unit), and finally found this old (2016) thread on another site (linked below). Prior to this, I only found the less helpful 'compare the reading to your Doctor's office' (BP varies with every reading, not...

In using scintillator or germanium energy sensors, certain radionuclides representing some definite line energies are used to calibrate the sensors. What technique or method is used to measure or determine the energies of these standards.

Often a calibration certificate for an instrument has the error found during the calibration as well as the uncertainty associated calibration itself. I'm reasearching uncertainty calculations using the GUM 1995 method and I haven't found one yet that includes the uncertainty of the calibration...

I'm trying to find literature on different methods to calibrate a meter stick. Does anyone know any good sources I could use?

Just curious if anyone out there is using the old low pressure sodium vapor lamps for spectral calibration and diffraction work. I was surprised that I do not see any bench ready laboratory lamps from the usual vendors. I understand that the last manufacturer of the low pressure bulbs, Philips...

I was watching "Northwest Law" last night (a TV show that follows Fish & Game Rangers in the Northwest), and when I saw an officer checking the calibration of their radar gun before using it on an ATV trail, I was very confused by it. He held it so that the tuning fork vibrated orthogonally to...

Many years ago I was given a problem involving the calibration of sets of weights. Each of two sets consisted of weights of 1.0 kg, 500.0 g, 300 g, 200 g, and 100 g. The two 1.0 kg weights were calibrated by the international agency in France and I was permitted to assume that their masses...

This problem came to existence as an attempt to justify a very common operation that an origami folder is often faced with. Broadly speaking, when one folds a model, it is almost always necessary to divide the paper into some segments. The statement that has to be proven: given the proportion...

Can anyone please illustrate highlighted part? Can anyone please explain me how invariance of s^2 is useful in characterization of events? I didn't understand the highlighted part i.e. how to determine velocity of S' relative to S?

I am computing limit of detection of zinc of an electrolyte. Using standard additions method, I have obtained positive x intercepts for 6/8 samples all very close to zero. Positive x-intercepts imply final concentration values to be negative. if x-intercept taken to be zero, the concentration...

Hi, I need some help to calibrate argon spectrum. I have a MicroLab Spectrometer (Model 141) to obtain spectral images of argon plasma. To calibrate the spectral images, I need a reference of known wavelength. Usually, a discharge tube is used to obtain the reference spectrum. However, I...

Hi, I've calibrated our pH meter using 4.01 and 7.01 buffer solution, but I'm not sure if the probe has dried out at some point. So I want to check the calibration, I have some HCl > 37% that I can use. Just a quick question, since pH is on a log scale so I have to make solutions every ten...

I've designed a venturi tube for my thesis ( Design of a digital peak flowmeter). I was wondering if there was a way to calibrate the flowrate, without using a measured flowrate producing device. The current error is about 12.3%. Theoretical 610L/min vs experimental 535L/min.

Homework Statement We wish to make a precipitation meter shaped like a paraboloid ##z = x^2 + y^2, 0 \leq z \leq 10##. Devise a scale on the z-axis that tells you the amount of precipitation in cm. In other words, at what height ##z = h## is the surface of water in the dish when there has been...

[SIZE=16px][FONT=Helvetica Neue]Hi, I have been using Semiconductor Parameter Analyzer Agilent 4156B for 1 year. Since a month it is malfuntioning. I am not getting the required IV for my Resistive Random Access Memory (RRAM) devices. To confirm, I checked my devices using some other lab's...

I am doing a lab which involves the determination of vapour pressure of a particular compound by Knudsen Effusion. Like other analytical methods it involves calibration but we are using the know vapour pressure of naphthalene because its in the accepted range. So we have an equation for the...

Hi, I'm stuck on part b) of the question below: Q: In order to perform pH determinations with a glass electrode, the cell potential was measured for threestandard solutions with the following pH values at 25 C: 2.04, 7.05, and 9.20. The cell voltage readout(in mV) for each of the above solutions...

I've just done an ion chromatography experiment and have normalized my data for a known sample which has a known concentration of 10ppm. I know that the first large peak is due to F- ions and so the area of the peak is propositional to the concentration of the ion. Given that I know the area...

HI.. This is my first post here. I want calibrate RTD sensors so I am planning to buy Temperature calibrators includes three instruments with individual reference senors for three different set points(-ve, and two positive points). I am planning to calibrate RTD sensor by these three...

Hi there guys, I'm conducting an experiment to calculate the mass flow rate of water. Bellow is a copy of the procedure: 1) Weigh the mass in kg of a container 2) Connect a flow meter to a tap (any source) with a pipe and insure the departure pipe goes into a sink 3) Open the tap an increase...

I have just done an efficiency calibration measurement for the HPGe detector of a whole-body counter. Ba-133 and Eu-152 were the calibration nuclides. For a calibration at low energies I thought of using the X-ray emissions of both nuclides as well. However, the result looks quite bad - see the...

How do we caliberate a thermometer by cross multiplying without using the formula

I have a load cell which must be placed onto a piece of vehicle structure. In an ideal world I would attach the load cell to the structure and calibrate both together to ensure a very accurate calibration, and that accurate loads are measured. However a problem arises if I need to replace the...

Hi, Could someone enlighten me in this matter? . how the calibration of cosmic distance scale affects the determination of the age of globular star clusters? thanks a lot :)

I am looking for way how to do relative calibration of light sensor (PMT). I would appreciate any suggestions or links to sources with description how to do it in very simple (understand also cheap if possible) way. For example. Let say that I have integration sphere with two outpust. I have...

Hi all, My university did not provide any metrology courses as part of my degree, and our lab experiment sessions are not very hands on, unfortunately. Thus, I am a bit out of my depth. I need to calibrate some temperature sensors as part of my mechanical engineering internship. I have an 8...

Ok, so we were doing TEM and at the end we were looking at calibration patterns and I'm preparing the presentation and I am writing the intro but I realized I'm not sure why the calibration pattern looks like concentric circles. I believe it is because we are scanning the beam across the sample...

Hello PF. Re. the light clock / train thought experiment. It seems to me that the clock calibration chosen, ( light's mirror to mirror path ), is determining the outcome of the experiment. And that a different calibration would give a different result. e.g. assuming the mirrors are one metre...

Just out of curiosity why is the calibration interval 1yr for lab instruments like DMM, scope etc. Why not 2 years. Also, you use a higher accuracy bench DMM to calibrate a hand held DMM. Instead of getting calibration done by an outside agency, Why not calibrate the handheld DMM...

Hey guys, Cannot seem to find the answer to my question within the Owners Manual for our high-frequency spectrum analyzer. When performing the 2-port calibration, it gives the option of testing in forward or reverse, which is a function of the test cable's orientation (male or female). Is it...

Hi I just wondering how to report negative values cuased by non-zero intersection. For example, when the absorbance<0.037 in the figure, the concentration would be negative. Thank you!

Homework Statement The problem involves a calibration curve which was created and where % T vs concentration was favored for use over the usual Absorbance vs concentration and a question of why would this be used in favor over the latter relationship curve was presented. other details...

Hello ! This is my first post on the Physics Forums. I am electronics technician employed in mass spectrometry laboratory at RBI Institute, Zagreb, Croatia. My question is related to calibration of RTD sensors, which I must do in another lab or division, and since I developed prototype of...

Hi guys, My friend was asked the following question in an interview: There are 3 weight scales and a 10kg weight. You weigh the 10kg on each scale 5 times (total of 15 measurements for the 3 scales), each measurement is a bit off the 10kg mark (lets say the first scale shows: 11kg, 9.4kg...

Hi, I currently have a black body calibration source which I use for work. It works great, I can calibrate all the IR thermometers just fine, however it isn't a simple quick "check". The IR thermometers are the ratio type in that they measure two wavelengths and using the ratio it can work out...

I mean i love having the screen set to perfect calibration like the iphone, but why don't we have tvs like that? It would be nice to not have to set anything on a tv and have a perfect picture quality. Do you think that will ever happen? Vice versa, do you think handheld devices will have screen...

Hi, I hope this is in the correct section, please feel free to move it or advise me to move if it's in the incorrect section. I work as an aerospace engineer and a sideline of what i do is to maintain the torque wrenches we use on the equipment. We have a set schedule for maintenance every...

Homework Statement Hi. I have a table where there is an absorbance for a 0.00 concentration (blank). I now that I have to substract that value to to each of the other absorbances that I have, but my question is... Do I have to graph (concentration 0.00, absorbance 0.00) in the calibration...

Hello, My problem is as follows: The lab I am working on requires the construction of a calibration curve from the measured absorbance of samples of known phenol concentration to intrapolate the phenol concentration of two unknown samples. I have constructed the calibration curve and...

i am trying to learn AIPS in preparation to doing research in radio astronomy. I know the basics of radio astronomy and that AIPS is used to reduce data and remove errors from images due to atmospheric disturbances, but I don't really know what kind of errors in the data I should be looking...

A new paper on supernova 1a distance calibration 'The luminosity of supernovae of type Ia from TRGB distances and the value of H_0' - http://arxiv.org/abs/1208.5054 - brings into question the value of Ho. The authors derive a value of H0 = 63.7, considerably below the present accepted value of...

what does calibrating a faraday cup mean??

Hi, I would like to know if anyone knows where can I find people who do certification of Sound Level Meter (Not calibration). I need to certify my Sound Level Meter to IEC 61672. Please provide details if you know who can do it. Thank you. Best Regards, Richard

Homework Statement in the reaction 10mL of 1M NaOH + 5mL of 1M HCl (adiabatic) given change in temp=2.1°C (temp initial is the temp of NaOH, temp final is acquired after the addition of HCl) find: qrxn, qcal, Ccal Homework Equations qrxn = -qca Ccal = qcal/∆T The Attempt at a...

Hello, Here is my problem: I've created reference pattern for camera calibration. It consist of well defined dots where each dot is unique. What I'm trying to do is to estimate lens distortion from only one photo. I can easily identify dots on photo, but I have no idea how to estimate the...

I understand the basic principle behind pressure sensor calibration but i am still not able to do a calibration problem. Could someone Explain how you would go about calibrating a standard 4-20mA Differential Pressure Transmitter (DPT) to measure differential pressure in the range 5 to 20 psi...

do strain gauges need calibration

Spring Calibration Data --> Need to figure out formula I feel like every time I post a problem here, I end up figuring it out. So, thanks for that! haha