Dalman Blog

  1. What is the difference between Accuracy and Precision?

    What is the difference between Accuracy and Precision?

    Accuracy & Precision: The story of the cross-bow and the apple

    We recently watched a fascinating TED Ed talk by Matt Anticole on YouTube about the difference between accuracy and precision.  Matt uses an analogy of the legend of William Tell, the Swiss folk hero.  

    William Tell was an expert marksman with a crossbow who was arrested with his son when he refused to be respectful to the King.  The King said that both he and his son would be executed, but then he King told William Tell he could save his son’s life if he shot through an apple placed on top of his son’s head.  In the legend William Tell is able to shoot the apple and save his son’s life.

    The talk considers two alternative scenarios.

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  2. Making Accurate Weight Measurements

    Making Accurate Weight Measurements

    Weighing The World

    Scales are used everyday throughout the world in a wide range of industries. From the raw material used in the products around us, to the food that we buy at the grocery store - almost everything around us was weighed using a scale at some point.

    Scales and other measuring devices come in a wide range of accuracy classes. For instance, most deli scales are accurate to only a few grams while a diamond or jewellry scale is typically accurate to a few milligrams (0.003g). For food portion use, a deli scale measures weight accurately enough to make your sandwiches, but if you had to measure something like gold or platinum, you would want to use a jewellry scale.

    Measurement Accuracy

    But how do you know if the scale you are using is accurate? If you check the various clocks around you, you might notice they don’t all agree with each other, with some more accurate than others. Th

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  3. Troubleshooting Your Digital Scale

    Here are some suggestions and advice on what action to take if your miniscale has ceased to function properly. The manufacturer’s warranty is covered for 10 years however there are certain exclusions. Before returning the scale and spending money on postage please go through the following points:

    1. Batteries

      Check whether the scale needs new batteries and if so replace them. Be careful to properly insert the batteries in the correct manner.

    2. Calibration and Surrounding Environment

      The scales are calibrated by the factory before shipment but after travelling around the world they may need recalibration as per the manufacturers’ guidelines.  Gravity is not the same all over the world. Also scales are sensitive to drafts and vibration. The above factors mean that the more sensitive the scale, the more it may need recalibration.

    3. Abuse or Lack of Care

      If the scale has lacked TLC, has

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  4. Top 3 Things To Look For When Purchasing A Digital Scale

    Need to purchase a high quality digital pocket scale? Selecting the right scale for your application is critical. Below we outline the top three things to look for when making your decision:

    1. Capacity & Readability

      With a wide range of scales on the market, choosing the right scale can be a daunting task.  The first and most important step in selecting the right scale is to determine how much capacity (and platform size) you will need. Be sure to select a scale with enough capacity to weigh your items plus a little bit of padding for rough treatment. The second part will be to determine how small of a change in weight you want to be able to display, also known as the scale's readability. The readability on scales typically gets better as you go down in capacity, so choose a scale that has enough capacity for your application, but not too much.

    2. Features

      Scales are available with a wide range of features to help with

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  5. Warranty Center

    When you’re having scale problems the first place to check is in your scale’s user manual. In your manual you can find instructions for use, model specifications and common errors and solutions.  If you cannot solve your problem with the manual, the warranty information below may be helpful.

     

    DALMAN, ON BALANCE AND MYCO WARRANTIES

    Dalman offers a three year warranty from the end user’s purchase date in the EU on all products bearing the On Balance, Myco and Dalman name brands. If you are having problems with your scale, please first check the User Manual as common problems can be easily resolved through battery replacement or calibration. If you are unable to solve the problem this way, you must take your scale back to where you purchased it. Dalman offers a warranty service to all wholesalers and shops that buy directly from us so there should be no problem dea

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  6. Selecting The Right Scale

    Capacity / Readability

    Scales come in a wide range of capacities and readabilities. When selecting any measuring device, you should select one which is just as accurate as you need it, but not more. For instance, wristwatches are typically accurate to only a few seconds per year while an atomic clock is accurate to a millionth of a second per day. For daily use, a wristwatch measures time accurately enough to make your appointments on time, but if you had to measure something like the speed of light to several decimal places you would want to use an atomic clock instead. However, the high costs, lengthy setup, and advanced skills required to operate an atomic clock make it out of reach for most measurement processes. Selecting a measuring device that is accurate enough for your application, but not more accurate than you need is crucial. If you purchased a scale with 0.001 g readability when a 0.01 g readability would have been sufficient, you may introduce unnecessary compl

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  7. Getting The Best Results From Your Scale

    Scales are precision instruments and require proper care and skill to get the best results. Here are some tips to help you get the most from your scale:

    • Use a stable countertop or table with a level surface. 
    • Place all items on the center of the scale platform. Don't let items hang over the platform or lean against other items.
    • Zero the scale between measurements for consistency.
    • Store your scale in a safe place to prevent dust from accumulating and keep the scale secure.
    • Take care not to drop or shock load your scale. This can cause stress to the load cell and affect calibration.
    • Let your scale adjust to the surrounding temperature before using or performing calibration.
    • Do not attempt to calibrate your scale using arbitrary items such as coins. While it is commonly known that US Nickels weigh approximately 5.0g when fresh from the mint, in circulation, Nickels can range typically from 4.95 to 5.05g (&p
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  8. How Digital Scales Work

    Most digital scales use a sensor called a load cell to convert a physical force (weight) into an electrical signal. This electrical signal is amplified and converted into a digital format so that it can be displayed as a weight value on the display. Sensors like load cells which convert a physical force into an electrical signal are called transducers. Speakers are another type of transducer which convert an electrical signal into a physical force by moving an electromagnet which then moves the the speaker's diaphragm to make sound. Both speakers and load cells deal with very small changes in electrical current which require a steady, noise-free power supply as well as amplification and sophisticated filtering methods to reduce electrical noise. Both speaker makers and scale makers take great care to reduce electrical noise in their circuits so that you get the most enjoyable experience out of your speaker, or measure just the right weight using your digital scale.

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  9. Sources of Error With Scales

    There are a number of forces that can affect the accuracy of a weighing result. All measuring devices deal with measurement error to some degree. Measurement error is the difference between the measured value and the "true" value. Some of the factors affecting measurement error with digital scales include:

    • Environmental Factors - Scales need to be used in a stable location, free from vibration, wind, and fluctuating temperatures. Scales perform best at room temperature and perform especially poor in cold temps. If you recently brought your scale out of storage or received it from the delivery man, you should let it adjust to the surrounding temperature for at least an hour before use. Rapidly changing temps can cause the weight readings to "creep" or drift in one direction.
    • User Error - Operator proficiency also plays a role in measurement accuracy. Being consistent with your measurement technique and knowing your scale's capabilities can all contribute to b
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