Hydraulic valve testing equipment commonly used technical parameters
来源: Ningbo Weige Electrical Appliances Co., Ltd. 作者: www.cn-weige.com 时间: 2012-07-24
A partial index, with representation in the weighing valve testing equipment technical parameter, the traditional method is the use of item index, the utility model has the advantages of clear physical meaning, used for many years, familiar with many people. We now list the main items are as follows: * the rated capacity of manufacturers are weighing range upper limit value.
* rated output ( sensitivity)
With the rated load and no load, the output signal of the difference between the valve testing equipment. Because the weighing valve testing equipment output signal and the excitation voltage, so the output unit to "mV/V". And called sensitivity.
* sensitivity tolerance
Valve testing equipment of the actual output and the corresponding nominal rated output of the difference between the nominal rated output percentage. For example, a weighing valve testing equipment rated the actual output of 2.002mV/V, compatible with the standard output is 2mV/V, the sensitivity of tolerance is: ( (2.002- 2. 000) /2.000) *100% = 0.1%
The empty load output values and the rated load output value is determined by the linear and the increase of load curve of the maximum deviation to the rated output value percentage.
* lag tolerance
No load is loaded into the rated load and then gradually unloaded. In the same load point load and unload output maximum difference of rated output value percentage.
* the repeatability error
Under the same environmental condition, the valve testing equipment of repeated loading to rated load and unload. During loading process are the same load point output values of the maximum difference of rated output percentage.
In the load constant ( general admission for the rated load ), other test conditions remain invariable situation, weighing valve testing equipment output with the change of time on the percentage of rated output.
* zero output
The recommended voltage excitation, not when the load is valve testing equipment output values for the percentage of rated output.
* insulation impedance
Valve testing equipment circuit between elastomers and DC impedance.
* input impedance
The signal output terminal is open, the valve testing equipment without load from the power supply input end, the measured impedance values.
* output impedance
Power supply input terminal short circuit, valve testing equipment without load, the signal output end of the measured impedance.
Temperature compensation range
In this temperature range, valve testing equipment rated output and zero balance have to undergo a rigorous compensation, so as not to exceed the specified range.
* zero temperature effect
Environment temperature changes induced by zero balance changes. General with temperature change for every10K, caused by zero balance variation on rated output percentage.
* the temperature effect on rated output
The change of environmental temperature change caused by the rated output. General to the temperature of each change caused by 10K rated constant amount of change of the output rated output percentage.
* use temperature range
Valve testing equipment in this temperature range using any of its performance parameters are not permanent deleterious changes
In two," OIML60international recommendations in use of the term". In" OIML60international recommendations"92 years edition as the basis, reference" JJG669--90 weighing valve testing equipment test specification" new technical parameters have roughly:
* weighing valve testing equipment output
( quality ) was measured by weighing valve testing equipment obtained from the measurement.
* weighing valve testing equipment division value
Weighing valve testing equipment measurement range is divided after one size.
* weighing valve testing equipment test index value ( V )
In order to accurately grade, in weighing valve testing equipment testing using, to the quality unit expression weighing valve testing equipment division value.
* weighing valve testing equipment minimum verification graduation value (Vmin )
Weighing valve testing equipment measurement range can be indexing indexing on minimum verification.
* minimum dead load ( Fsmin )
Can be applied to the weighing valve testing equipment without exceeding the maximum permissible error of the quality of the minimum value.
* the largest weighing
Can be applied to the weighing valve testing equipment without exceeding the maximum permissible error of the maximum value of the quality.
* nonlinear ( L )
Weighing valve testing equipment process calibration curve and theory straight line deviation.
* lag error ( H )
Applying the same load weighing valve testing equipment output readings between the maximum difference; one is determined by the minimum dead load process started by reading, another is determined by the maximum began to return readings.
* creep ( Cp )
In the load change, all environmental conditions and other variables remain unchanged, weighing valve detection device full load output changes with time.
* minimum dead load output recovery plant ( CrFsmin )
A load is applied before, after the weighing valve testing equipment minimum dead load difference between outputs.
* the repeatability error ( R )
Under the same load and under identical environmental conditions, so that the continuous several times on the weighing valve testing equipment output readings of the difference between.
* temperature on minimum dead load output effects ( Fsmin )
Due to environmental temperature changes caused by the minimum dead load output changes between.
Effect of temperature on the sensitivity of the output * ( St )
Due to environmental temperature changes caused by the sensitivity of the output change.
* weighing valve testing equipment measurement range
The measured value range ( quality ), the measurement results in this range does not exceed the maximum permissible error.
Safety load limit
Can be applied to the weighing valve testing equipment 's maximum load, the weighing valve testing equipment in performance characteristics, will not exceed the specified value of the permanent drift.
* the temperature and humidity on the minimum dead load output effects ( FsminH )
Due to the change of temperature and humidity caused by the minimum static load output variation.
* the temperature and humidity on the sensitivity of the output effect
Due to the change of temperature and humidity caused by the sensitivity of the output change.
In addition, in" JJG699 - 90weighing valve testing equipment verification regulations", also listed a technical parameters, i.e.
* minimum load ( Fmin )
Force generating device can achieve the closest to the weighing valve testing equipment minimum dead load quality value.
It is because the valve testing equipment measurement, always in force measuring machine, and it is very difficult to directly measure the minimum static load performance. To illustrate the point," OIML60international recommendation" is specialized for weighing valve testing equipment and make, it weigh valve testing equipment assessment is the starting point to adapt to the requirements of weighing. When the valve testing equipment for other purposes, this assessment is not necessarily the most appropriate.