双活塞式压力计准确度等级的确定

双活塞式压力计基于不同结构可分为双活塞式压力真空计和双量程活塞式压力计两种。针对后者的结构特点,分析两套活塞系统共用一套砝码的问题,根据活塞的参数以及专用砝码质量计算出标称值下的实际压力值。本研究根据不同压力量程段来划分活塞式压力计的准确度等级,实现活塞式压力计的溯源性校准,以保证压力量传中的准确性和一致性。     

新一代全自动活塞式压力计

正KY-Z2压力范围:0.1MPa~250MPa工作介质:液体KYQ-Z2压力范围:5kPa~100MPa工作介质:气体KY-Z2是新一代液体介质全自动活塞式压力计,量程上限可以达到250MPa,准确度等级覆盖0.005级至0.05级。KYQ-Z2是气体介质的全自动活塞式压力计,可以测量表压和绝压,当量程大于10MPa时,活塞工作形式为油润滑。该系列活塞压力计可实现全自动加码、全自动加压。量程和准确度等级与JJG59-2007《活塞式压力计检定规程》和JJG1086-2013《气体活塞式压力计检定规程》的要求一致。     

新一代全自动活塞式压力计

正KY-Z2是新一代液体介质全自动活塞式压力计,量程上限可以达到250MPa,准确度等级覆盖0.005级至0.05级。KYQ-Z2是气体介质的全自动活塞式压力计,可以测量表压和绝压,当量程大于10MPa时,活塞工作形式为油润滑。该系列活塞压力计可实现全自动加码、全自动加压c量程和准确度等级与JJG59-2007《活塞式压力计检定规程》和JJG1086-2013《气体活塞式压力计检定规程》的要求一致。     

气体活塞压力计通过浙江省计量院验收

正近日,陕西创威科技有限公司为浙江省计量科学研究院制造的基准级0. 005级气体活塞压力计,顺利通过验收。本次交付的产品为:四个不同活塞公称面积,即1平方厘米、2平方厘米、5平方厘米、10平方厘米的活塞各一套。均为读数精度十万分之五的气体活塞式压力计。量程分别为0. 05～2. 5 MPa和5～400 kPa,以及气体活塞显示工作指示器等附件。客户验收的,不仅仅是取得中国计量科学院的《检定证书》,更是活塞系统性能的综合评价,比如活塞转动延续时间不小于4 min,活塞下降速     

活塞压力计自动化校准方法研究

利用高精度压力传感器作为原位传递标准,提出了一种活塞压力计校准新方法。对传感器的分辨率和短期稳定性进行了测试,并评估了传感器线性系数对校准结果的影响。对比研究了新方法和传统方法的校准结果,两者的不确定度均约为5×10-6(k=1),且在不确定度范围内是一致的。在新方法的基础上研制了活塞压力计自动化校准装置,实现了压力控制、阀门操作和数据采集等功能的自动化。该自动化装置提高了活塞压力计校准的效率。     

10 kPa气体活塞式压力计计量性能测试研究

用FPG8601型活塞式压力计作为标准器,对一台测量范围为1.2～10 kPa的气体活塞式压力计的活塞有效面积和鉴别阈进行了测试研究.介绍了标准器的特点和溯源方法,对被测器需要进行全量程测试的必要性和测试程序进行了阐述.测试覆盖了包括被测器测量下限在内的5个不同压力点,计算得到其活塞有效面积的平均值为9.773 71 ...     

FPG8601微压气体活塞式压力计的校准

FPG8601微压气体活塞式压力计的结构原理有别于传统的活塞式压力计,本文对其进行了简要介绍。由于其特殊性,该压力计进行量值溯源时需要对内部的力传感器和压力量值分别进行校准,并可通过压力量值校准结果计算其活塞有效面积。本文对校准方法进行了介绍,校准结果表明,压力的相对误差不超过±6. 7×10~(-6),示值误差的相对扩展不确定度不超过1. 6×10~(-5)(k=2)。     

一种校准双活塞式压力真空计活塞有效面积的方法

提出了一种新的校准双活塞式压力真空计活塞有效面积的方法.利用数字压力计较好的分辨力和短期复现性的特点,将标准活塞式压力计的量值间接传递至双活塞式压力真空计.结果显示:用新方法测得活塞有效面积相比于传统方法仅相差0.003％,相对扩展不确定度在(4～7)×10-5(k=2)范围内.研究表明,该方法可用于校准0.05级双活...     

新一代宽量程250MPa活塞式压力计近日于创威公司研制成功

针对当前国内部分企业生产的250 MPa宽量程活塞式压力计打压费力、稳压困难、密封性差等不足,经创威研发团队的长期不懈努力,于近日研制出了新一代250 MPa宽量程活塞式压力计。该压力计整个机身的设计是采用高强度铝合金制造,轻便、坚固、美观;活塞系     

超高压可控间隙活塞式压力计的长期稳定性

介绍了超高压可控间隙活塞式压力计的长期稳定性核查方法和稳定性实验数据,准确度为0.02％的30 ～1500 MPa超高压力基准活塞式压力计的年稳定性约为0.003％.活塞下降1mm位移需要1Omin的外套压力pj10逐渐增大和为零时的理想状态下的外套压力活塞系统间隙p2基本不变,表征了碳化钨活塞与高强度合金钢的活塞筒之间摩擦,导致活塞筒内径略有增大、活塞尺寸基本不变.     

基于任意波形发生器的高压短路试验测量系统校准方法和装置的研究

提出了一种将标准短路试验波形注入多通道任意波形发生器,来产生模拟实际的校准波形,进而对测量系统进行校准的方法。校准装置使用现场可编程门阵列(FPGA)、直接数字频率合成器(DDS)等器件。对装置的检定结果表明:在10 Hz^200 kHz频率范围内,输出频率、输出电压最大误差分别为2.1×10^-6、3×10^-3。重复输出10次,输出幅值的最大相对标准偏差为5.7×10^-4,1年内幅值变化的最大相对标准偏差为1.9×10^-4。通过将该装置用于实际高压短路试验测试系统的校准,验证了试验波形的噪声、零漂及带宽均会对测量系统的准确度产生显著影响。     

A Gas Pressure Scale Based on Primary Standard Piston Gauges

The National Institute of Standards and Technology (NIST) has redefined its gas pressure scale, up to 17 MPa, based on two primary standard piston gauges. The primary standard piston gauges are 35.8 mm in diameter and operate from 20 kPa to 1 MPa. Ten secondary standard piston gauges, two each of five series of the Ruska 2465 type, with successively smaller diameters form the scale extending up to 17 MPa. Six of the piston gauges were directly compared to the primary standards to determine their effective area and expanded (k = 2) uncertainty. Two piston gauges operating to 7 MPa were compared to the 1.4 MPa gauges, and two piston gauges operating to 17 MPa were compared to the 7 MPa gauges. Distortion in the 7 MPa piston gauges was determined by comparing those gauges to a DH Instruments PG7601 type piston gauge, whose distortion was calculated using elasticity theory. The relative standard uncertainties achieved by the primary standards range from 3.0 × 10⁻⁶ to 3.2 × 10⁻⁶. The relative standard uncertainty of the secondary standards is as low as 4.2 × 10⁻⁶ at 300 kPa. The effective areas and uncertainties were validated by comparison to standards of other National Metrology Institutes (NMIs). Results show agreement in all cases to better than the expanded (k = 2) uncertainty of the difference between NIST and the other NMIs, and in most cases to better than the standard (k = 1) uncertainty of the difference.     

能量分析器型真空电离规性能研究

电子激励脱附(ESD)效应和软X射线效应是影响电离真空计测量下限的两大重要因素.基于能量分析器研制了电离真空规,在极高真空校准装置上对其开展性能研究,包括不同压力或不同阴极发射电流下的离子流、ESD效应和软X射线影响.结果 表明,系统压力介于10-8Pa和10-6 Pa之间,当气体发生电离,能量分析器电压在低于阳极电压...     

利用超高压力国家基准对返压活塞式压力计校准的试验研究

原超高压力国家基准准确度仅为0.1级，无法对0.05～0.1级的活塞压力计进行检定。现在新的1500MPa国家基准准确度达到了0.02级，为超高压活塞压力计的检定打好了基础。2005年利用新的国家基准对南京理工大学0．05级的1000MPa返压式活塞压力计和国营9319厂0.1级6000kgf／cm^2返压式活塞压力计作了校准。本文报告了校准时两台活塞压力计的压力平衡判断原则，介绍了一种较为成功的锰铜压力计间接比较法。     

Kolbenmanometer mit Kraftmesszelle zur Kalibrierung sehr kleiner Drücke

Piston gauges are very precise pressure gauges. In the conventional design, the force exerted by the pressure balances the gravitational force on a piston or cylinder. Due to the mass of piston or cylinder, the smallest measurable pressure is limited to a few kPa (a few 10 mbar). The company DH Instruments, Inc. has developed a new piston gauge in which the pressure‐ induced force on the piston is measured by a mass comparator. Thereby, the measuring range is substantially extended towards smaller pressures. The instrument offers a measuring range from 1 Pa to 15 kPa (0,01 mbar to 150 mbar) for gauge and absolute pressure. The resolution is 1 mPa (10^‐5 mbar) and the uncertainty (5 mPa + 3·10^‐5 p). The piston gauge is calibrated through the determination of mass and piston‐cylinder effective area. An automated pressure controller is included in the instrument. Integrated software allows multi‐point calibrations with another device to be run unattended. The system has been used to perform an automatic test of capacitance diaphragm gauges in a variety of ranges.     

肺功能仪用定标筒容量校准方法

提出一种以静力称重法为基础并结合负压原理的肺功能仪用定标筒(以下称为定标筒)容量校准方法,设计了定标筒容量校准装置。校准时,定标筒活塞杆拉出,定标筒内形成负压,在压力作用下介质(纯水)进入称量筒;采集环境大气压力、介质质量和温度等数据;计算出20℃时定标筒的容量。根据定标筒容量测量原理,建立其容量测量模型。实测某个定标筒,其容量为3.001 96 L的定标筒,测量结果的不确定度为9.6×10^-4(k=2)。分析表明,该装置具有可靠性,可实现快速校准并满足定标筒容量校准要求。     

An automated guarded bridge system for the comparison of 10kΩ standard resistors

An automated guarded resistance bridge has been specifically developed at the National Institute of Standards and Technology (NIST) for the calibration of high-quality 10 kΩ standard resistors. The system is designed to compare up to 30 nominally equal, four-terminal resistors with a resolution and combined relative standard uncertainty of 0.01×10^-6 and 0.02×10^-6, respectively. It features a self-balancing detector circuit, and a programmable coaxial connector switch for selecting resistors. With a few minor modifications, the system is capable of comparing other nominally equal resistors in the range 100 Ω to 1 MΩ     

High-accuracy time transfer via geostationary satellites:preliminary results

Signal-delay phase measurements have been performed with Ku-band Earth station and VSAT (very-small-aperture terminal) facilities in various loop-around schemes using both a satellite simulator and geostationary satellites. Stability plots show that the standard deviation of pair differences (σ_y) is 4×10^-10 _τ^-1 for a C/No (carrier-to-noise density) ratio of 65 dB-Hz. This white-noise behavior continues for several days, when satellite simulator data shows σ _y to be 3×10^-15. Absolute phase-delay measurements show reproducibility to better than 1 ns over a 16-day sample time. This suggests the potential for accuracy to this level, given an appropriate calibration. A measurement method is described which determines the principal time-delay constant affecting the accuracy of time synchronization using a two-way satellite communications technique