(1) 量測變壓器有無AC 10V輸出,不正常時更換變壓器。
(2) 量測橋式整流器 DC 10V 輸出,不正常時更換整流器。
(3) 量測TIP31C第一腳約8V,第二腳約8V輸出,不正常時更換TIP31C。
(4) 如果 E腳電壓在6V 以下,查 D2 (稽納二極體及R17 2W電阻可能不良。
(5) 量測 U4 LM723,第三腳約6.8~7.15V,第四腳約3.4V, 第五腳約4V, 第6腳約 7.2V, 不正常時更換 U4 LM723。
(6) 如果上述電壓都正常, 但充電燈一直不變(綠色),Q7 975可能不良。

1. Select a good brand with good reputation, and with R&D, Quality Management team.
2. Look at the capacity and specification that meet your needs.
3. Check its repeatibility. Just repeatly put the same object on the scale to see whether the weight is the same.
4. Check its function: Power on the scale and check if the digits is clear. Press the platter with hands to check whether the weight has changed and then release the hands to check the digits return to zero. Check the correction and reliability of the keypad and combination keys according to the manual.
5. Check appearance to see if the outer of the scale is smooth, color even, no rip and the display should is even, the digits are clear.

1. All our price computing scale has type approval certification.
2. "3000 millions liability insurance" are guaranteed for all our scales.
3. One year service and support for our scale products.

1. Make sure the scale manufacturers have licence to do measuring instrument business.
2. Make sure the scale products are with measuring instrument type approval.
3. The manual and LIMITED WARRANTY documents are included.
4. Insurance certificate are included.

It is also called repetitiveness. Methods of testing:
We test 3 times through testing linearity. The largest tolerance with standard value in testing.
Express way
tolerance of re-linearity < 0.0333333 % R.O
R.O is Rated Output
For example:
15.000kg*0.005kg Its external resolution =15.000kg/0.005kg= 3000E
To shift tolerance of re-linearity of external value= 3000E * 0.0333333% = 0.999999E ≒ 1E =0.005kg
Capacity: 0.000kg ~ 15.000kg; tolerance of linearity: ± 0.005kg

± 2% of the maximum capacity.

It is zero value that records after the digits countdown from 9 to 0.

It is zero value that records when doing specification calibration or weight calibration.

Temperature change effect on output
Express way：
TEMP. Effect on output: 0.020% R.O/10℃
R.O is Rated Output
For example：
15.000kg*0.005kg Its external resolution =15.000kg/0.005kg= 3000E
Change range of temperature：-10℃~ +40℃; temperature change in total:50℃
3000E * 0.02% * (50℃/10℃) = 3E = 3 *0.005kg=0.015kg
When using 1/3 capacity (equals to5.000kg) to measure:
(5.000kg / 15.000kg) * 3000E * ( 50℃ / 10℃ ) = 1E = 0.005kg