
規模精度與精確度:數字的真正意義
Lisa Thompson
Storage & Preservation Specialist
規模精度與精確度:數字的真正意義
比例規格可能會令人困惑。 「0.1g 精度」的實際意義是什麼? 「可讀性」與「準確性」相同嗎? 本指南以簡單的語言解釋比例規格,因此您可以選擇正確的比例並了解您的閱讀材料真正告訴您的內容。
快速回答
準確度是多麼接近真實重量;精確度是多麼一致。 0.1g 量表可以檢測 0.1g(十分之一克)的差異。 對於花,0.1g 可以正常工作。 對於濃縮物,您需要 0.01g 或 0.001g。可讀性 = 顯示的最小增量。 準確度 = 實際測量可靠性。 它們是相關的,但不相同。
理解比例規格
For statistical concepts in measurement accuracy, NIST 工程統計手冊 provides technical guidance.
可讀性(解析度)
是什麼: The smallest weight increment the scale displays.
Example:
- 0.1G 可讀性顯示:1.0、1.1、1.2 等。
- 0.01G 可讀性顯示:1.00、1.01、1.02 等。
- 0.001G 可讀性顯示:1.000、1.001、1.002 等。
Key point: This is what you SEE, not necessarily what's TRUE.
Accuracy
是什麼: How close to the actual weight the reading is.
Example:
當真實重量為 3.48g 或 3.52g 時,刻度可能會顯示 3.5g。精度會告訴您預期的偏差。
通用精度規格:
- 「±0.1g」意味著讀數可能會下降高達 0.1g
- 3.5g 讀數實際上可能是 3.4g 到 3.6g
精度(可重複性)
是什麼: How consistently the scale gives the same reading for the same item.
精度高: Weigh same item 5 times, get 3.50g each time.
精確度差: Weigh same item 5 times, get 3.48g, 3.52g, 3.49g, 3.51g, 3.50g.
關係
不同的精度在實踐中意味著什麼?
0.1g 精度(口袋秤)
您可以可靠地測量:
- 1g及以上充滿信心
- 0.5g 具有合理的精度
- 低於 0.5G 變得不可靠
Best for:
- 驗證八分之一、四分之一、盎司
- 一般花卉稱重
- 日常使用
不適合:
- 單半克購買
- 濃縮物
- 精確劑量
閱讀解釋:
當比例顯示 3.5G 時,實際重量可能為 3.4-3.6G。
0.01g 精度(精密口袋秤)
您可以可靠地測量:
- 0.1g及以上 具有高置信度
- 0.05g 具有合理的準確性
- 少量更好
Best for:
- 驗證較小的購買
- 更準確的花稱
- 預算集中稱重
- 更好的可食用劑量
閱讀解釋:
當比例顯示為 3.50g 時,實際重量可能為 3.48-3.52g。
0.001g 精度(毫克秤)
您可以可靠地測量:
- 0.01g 以上 充滿信心
- 0.005g 具有合理的準確性
- 極度精確
Best for:
- 濃縮物
- 精確的可食用
- 科學精確性
- 專業用途
閱讀解釋:
當比例顯示為 3.500g 時,實際重量可能為 3.498-3.502g。
準確度與精確度
都很好(理想)
讀數:3.50、3.50、3.50、3.50、3.50
真實重量:3.50g
Result: Perfect—accurate and precise.
精確但不準確
讀數:3.55、3.55、3.55、3.55、3.55
真實重量:3.50g
Result: Consistently wrong. Needs calibration.
準確但不精確
讀數:3.48、3.52、3.49、3.51、3.50
真實重量:3.50g
Result: Averages correct but individual readings vary. Environmental issue likely.
兩者都沒有(壞規模)
讀數:3.45、3.58、3.42、3.61、3.49
真實重量:3.50g
Result: Unreliable. Replace or repair scale.
將準確性與目的相匹配
大麻花
底線: 0.1g works for most flower purposes. 0.01g is better for small amounts.
For Concentrates
Bottom line: 0.001g is really the only appropriate accuracy for concentrates.
For Edibles
Understanding Margin of Error
What ± Means
When specs say "±0.1g":
- Reading of 5.0g means actual could be 4.9-5.1g
- Reading of 3.5g means actual could be 3.4-3.6g
Error Compounds with Small Weights
At larger weights:
5.0g ± 0.1g = 2% potential error
At smaller weights:
0.5g ± 0.1g = 20% potential error
Lesson: Accuracy matters more for smaller amounts.
Why Cheap Scales Are Worse
Better scales:
- Tighter actual accuracy than spec
- More consistent
- Better at edges of range
Cheap scales:
- May not meet stated spec
- Worse at small weights
- More environmental sensitivity
Testing Your Scale's Accuracy
Using Known Weights
Calibration weights (best):
- Known precise weight
- Use to verify and calibrate
Coins (adequate):
- US nickel = 5.00g
- US penny (post-1982) = 2.50g
- Stack for larger weights
Precision Test
1. Weigh same item 5 times
2. Record each reading
3. All same = good precision
4. Variation = precision issue
Accuracy Test
1. Weigh known weight (calibration weight or coins)
2. Compare to known value
3. Close = good accuracy
4. Off = needs calibration or replacement
Improving Your Readings
Environmental Factors
For best accuracy:
- Level, stable surface
- Away from air currents
- Consistent temperature
- No vibrations
Usage Factors
For best accuracy:
- Calibrate regularly
- Fresh batteries
- Let scale warm up
- Don't rush readings
Scale Factors
For best accuracy:
- Quality brand
- Appropriate accuracy for task
- Proper maintenance
- Not exceeding capacity
Quick Reference
Accuracy by Scale Type
When Readings Matter Most
- Verifying purchases: Need accuracy
- Consistent dosing: Need precision
- Making edibles: Need both
- Casual use: Either works
Summary
Understanding scale specs helps you:
1. Choose right accuracy for your needs
2. Interpret readings correctly
3. Identify problems when they occur
4. Not overpay for unnecessary precision
For most cannabis flower use, 0.1g accuracy is sufficient. For concentrates or precision work, 0.001g is essential. Don't be fooled by extra decimal places—readability isn't the same as accuracy.
This guide is for educational purposes. Always comply with local laws regarding cannabis.
Frequently Asked Questions
準確度是刻度讀數的真實重量。 精確度是它給出相同讀數的一致性。 量表可以是精確但不準確(始終錯誤)或準確但不精確(變化但平均正確)。 好的規模是兩者。
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