Frequency Error Ppm
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Ppm Accuracy Definition
Modular Instruments>>Dynamic Signal Acquisition and Analysis (DSA)>>PXIe-4499, Modular Instruments>>Dynamic Signal Acquisition and Analysis (DSA)>>PXI-4461, Modular Instruments>>Dynamic Signal Acquisition and Analysis (DSA)>>PXIe-4498 Problem: How
Clock Ppm Vs Jitter
can I determine frequency error and frequency measurement or generation accuracy? Solution: Frequency accuracy (sometimes called timing accuracy) is usually given in parts per million (ppm) of the sample rate. This value depends on the device that you are using and can be found in the device's what is frequency error specifications. In addition to frequency accuracy (fa), frequency error (fe) is also something that you can calculate, using the equations below:Measured frequency (fm) = signal frequency (fs) ± frequency error (fe). Rearranging the above equation to solve for frequency error: Frequency error (fe) = signal frequency (fs) * frequency accuracy (fa). Examples:Consider a case in which you are measuring a precise 100kHz sine wave, using a device with a frequency accuracy of 25 ppm. The frequency error will be 100,000Hz * 25/1,000,000 = 2.5Hz. Therefore, the frequency accuracy is 100kHz ± 2.5Hz.Consider a case in which you are generating a 1kHz sine wave, using a device with a frequency accuracy of 50 ppm. The frequency error will be 1,000Hz * 50/1,000,000 = 50mHz. Therefore, the frequency accuracy is 1kHz ± 50mHz. Related Links: KnowledgeBase 1F5DD5KD: What I
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Frequency Of Error In Test
Calculators Training PPM Calculator × Errors Found Close Oscillators and ppm calculator excel other frequency control devices specify their frequency variation in units of parts per million (ppm). Use ppm to frequency nmr the calculators below to convert between ppm and Hz. The equation for this relationship is, where ppm is the peak variation (expressed as +/-), f is http://digital.ni.com/public.nsf/allkb/2A0B9D3F365DEDEF86256BDB007354ED the center frequency (in Hz), df is the peak frequency variation (in Hz), and 106 is 1000000 (e.g. one million). Enter numbers below as integers, decimals, or use scientific notation (for example, enter 1500 as 1500, 1.5e3, or 1.5E3). Convert ppm to Hz Enter f (Hz) Enter ppm (+/-) Variation, +/- df https://www.jitterlabs.com/support/calculators/ppm (Hz) Min Frequency (Hz) Max Frequency (Hz) Max - Min Period (sec) For example, 100 ppm of 100 MHz represents a variation in frequency of 10 kHz. The maximum and minimum frequencies are therefore 100.01 and 99.99 MHz, respectively. The change in period between these two frequencies is 2 ps (that is, 1/99.99MHz - 1/100.01MHz). Convert Hz to ppm Enter f (Hz) Enter max or min f (Hz) Variation, +/- df (Hz) ppm (+/-) ppb (+/-) = 1000×ppm Max - Min Period (sec) For example, if a center frequency varies from 100 MHz to 100.01 MHz, this 10 kHz frequency variation represents 100 ppm. COMPANY Contact Subscribe News Trust SERVICES How It Works System Vendors Device Vendors Timing Vendors Test Reports JitterLabs App Custom Testing Pricing SUPPORT Customer Service FAQ Documentation Publications Videos Calculators Training JitterLabs, 1551 McCarthy Blvd, Suite 111, Milpitas, CA 95035 (USA) Telephone: 1 (408) 627-6454 © Copyright JitterLabs, LLC. All rights reserved.
& Techniques PIC Tutorials Microcontroller Blog Site map. PIC C Course - 25% Off 18F Training Become a subscriber (Free) Join 29,000 other subscribers to receive subscriber sale discounts and other free resources. Name: E-Mail: Don't worry -- your e-mail address is totally secure. http://www.best-microcontroller-projects.com/ppm.html I promise to use it only to send you MicroZine. Clock accuracy in ppm Crystal Clock accuracy is defined in terms of ppm or parts per million and it gives a convenient way of comparing accuracies of different crystal specifications. Note: ppm parts per million. ppb parts per billion. The following headings give practical calculations showing the typical errors you will encounter when using a clock of a specific type with a specific accuracy. How good frequency error is a 1% accurate clock ? If you look at a day's worth of timekeeping then you have 24 x 60 x 60 = 86400 seconds in a day. So the maximum error after a day has passed is 1% of 86400 = 864 seconds = 14.4 minutes! Error: 14.4 minutes error per day. How good is a typical crystal ? A typical crystal has an error of 100ppm (ish) this translates as 100/1e6 or (1e-4) So the total error on frequency error ppm a day is 86400 x 1e-4= 8.64 seconds per day. In a month you would loose 30x8.64 = 259 seconds or 4.32 minutes per month. Error: 8.64 seconds per day How good is a watch crystal ? A watch crystal has an error of 20ppm (ish), but you have to design the board layout well, this translates as 20/1e6 (2e-5) which gives an error over a day of 86400 * 2e-5 = 1.73 seconds per day so in a month it looses 30x1.72 = 51 seconds or 1 minute a month (approx). Error: 1.73 seconds per day. One of the other factors in a wrist watch is that you wear it on your wrist - and the human body is at a constant temperature. Crystals have a temperature coefficient graph meaning that another source of error is temperature (This is why you can buy an OCXO or Oven Controlled Crystal Oscillator - that generates heat and keeps a constant temperature). The watch crystal will be better because you keep it at a constant temperature! How good is an oven controller crystal oscillator OCXO ? A typical spec might be ±1 x 10-9 (1ppb) so the error after a day would be 86.4us and after a month 2.6ms (2.6e-3 seconds or 2.6 thousandths of a second!). They are not quoted in ppm as it becomes inconvenient to write e.g. this OCXO has a ppm