"Express Time" viewer Mr. Li called and said that he had encountered a new "cheat scale" method: Before the year before, he went to the roadside fruit stand to buy fruit and found that the hawker weighed under the electronic scales was covered with a thick layer. Blanket, attentive Mr. Lee home with a scale, 10 pounds of fruit is missing 3 two.
In fact, there have been complaints from viewers and readers in the early years, saying that vendors in Hangzhou farmers' market had “stuck scales†in plastic foam under electronic scales. Will a blanket or foam under the electronic scales really affect the measurement standards? Say no evidence, experiments prove!
"Curious Lab" experimenters found two types of electronic scales commonly used in the market: a maximum reading of 15 kg, another maximum reading of 30 kg, and a minimum reading of 1 gram, for on-site testing.
Before the experiment, we put two scales on a flat table and then put them on an electronic scale with a 5 kg standard weight. Both electronic scales show: 5.000 kg, accurate measurement.
We tested the blanket with a thickness of about 0.6 cm, laid it flat on the table, and placed two electronic scales for weighing. The weighing result of 5 kg standard weight is still 5.000 kg, and the two scales are exactly the same.
We folded the blankets in half and stacked them up to eight layers. The shop still looks flat on the table. Put two electronic scales to weigh, the result is still 5.000 kilograms.
Continuing to increase the thickness of the blanket, the blanket was folded into 16 layers, approximately 10 cm thick, and there was no tilt after the electronic scale was placed. However, the measurement results changed - the electronic scale with a maximum reading of 15 kg jumped out 4.995 kilograms. , Light 5 grams; the maximum reading 30 kg of electronic scales jumped 4.990 kg, light 10 grams.
Why is the heavy weight of the electronic scale weighed because of the thick blankets? If the vendors are “deceived†like this, isn't it their own to lose?
“In order to ensure the accuracy of measurement, the state has stipulated that any weighing instruments that are weighed must be placed on a hard, flat surface,†said Song Wei, a tester at the Metrology and Verification Center of the Hangzhou Institute of Quality and Technology Supervision and Testing. Each electronic scale has a horizontal bead. When the horizontal bead is in the middle position, it means that the electronic scale is placed horizontally so that the weighing is accurate.
"The soft texture of blankets and plastic foams will deform after load-bearing. Unbalanced bearing planes will cause tilting of the horizontal beads, which will result in inaccurate measurement results."
Song Wei said that after a soft object under the electronic scale, the measurement results may be biased, it may be too light, and bad traders in the long-term practice, also summed up a set of experience, know how to place the measurement results will be biased - - Apply an external force to the electronic scale, lightly press the platform of the electronic scale, or slightly lift the scale, and the weight result will increase. "The Curiosity Lab" tested a lot, this is indeed the case.
If you later notice that vendors have unusual behavior when weighing, you should pay attention. However, it is difficult to avoid the bright guns to hide dark arrows, Hangzhou City, Quality and Technical Supervision and Inspection Institute also encountered modified electronic scales, hands-on inside the scales, relatively speaking, it is not easy to find.
“Electronic scales in the farmers' market in Hangzhou have a red seal posted by the quality supervision department. Consumers can see if the seal is passive; and the electronic scales at the roadside stalls have a seal at the factory. Everyone can Judging by seeing whether the seal is complete or not," Song Yu said.
In fact, there have been complaints from viewers and readers in the early years, saying that vendors in Hangzhou farmers' market had “stuck scales†in plastic foam under electronic scales. Will a blanket or foam under the electronic scales really affect the measurement standards? Say no evidence, experiments prove!
"Curious Lab" experimenters found two types of electronic scales commonly used in the market: a maximum reading of 15 kg, another maximum reading of 30 kg, and a minimum reading of 1 gram, for on-site testing.
Before the experiment, we put two scales on a flat table and then put them on an electronic scale with a 5 kg standard weight. Both electronic scales show: 5.000 kg, accurate measurement.
We tested the blanket with a thickness of about 0.6 cm, laid it flat on the table, and placed two electronic scales for weighing. The weighing result of 5 kg standard weight is still 5.000 kg, and the two scales are exactly the same.
We folded the blankets in half and stacked them up to eight layers. The shop still looks flat on the table. Put two electronic scales to weigh, the result is still 5.000 kilograms.
Continuing to increase the thickness of the blanket, the blanket was folded into 16 layers, approximately 10 cm thick, and there was no tilt after the electronic scale was placed. However, the measurement results changed - the electronic scale with a maximum reading of 15 kg jumped out 4.995 kilograms. , Light 5 grams; the maximum reading 30 kg of electronic scales jumped 4.990 kg, light 10 grams.
Why is the heavy weight of the electronic scale weighed because of the thick blankets? If the vendors are “deceived†like this, isn't it their own to lose?
“In order to ensure the accuracy of measurement, the state has stipulated that any weighing instruments that are weighed must be placed on a hard, flat surface,†said Song Wei, a tester at the Metrology and Verification Center of the Hangzhou Institute of Quality and Technology Supervision and Testing. Each electronic scale has a horizontal bead. When the horizontal bead is in the middle position, it means that the electronic scale is placed horizontally so that the weighing is accurate.
"The soft texture of blankets and plastic foams will deform after load-bearing. Unbalanced bearing planes will cause tilting of the horizontal beads, which will result in inaccurate measurement results."
Song Wei said that after a soft object under the electronic scale, the measurement results may be biased, it may be too light, and bad traders in the long-term practice, also summed up a set of experience, know how to place the measurement results will be biased - - Apply an external force to the electronic scale, lightly press the platform of the electronic scale, or slightly lift the scale, and the weight result will increase. "The Curiosity Lab" tested a lot, this is indeed the case.
If you later notice that vendors have unusual behavior when weighing, you should pay attention. However, it is difficult to avoid the bright guns to hide dark arrows, Hangzhou City, Quality and Technical Supervision and Inspection Institute also encountered modified electronic scales, hands-on inside the scales, relatively speaking, it is not easy to find.
“Electronic scales in the farmers' market in Hangzhou have a red seal posted by the quality supervision department. Consumers can see if the seal is passive; and the electronic scales at the roadside stalls have a seal at the factory. Everyone can Judging by seeing whether the seal is complete or not," Song Yu said.
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