定价：

定价：

定价：

定价：

定价：

定价：

定价：

定价：

The fundamental basis for making a measurement of resolution of a camera system is to reproduce a suitable test chart with the equipment under test. This test chart shall include a pattern that has a sufficient amount of fine detail so that a quantitative observation can be made of the amount of this detail in the reproduced picture. This is usually done by incorporating in the chart a series of lines having graduated widths. The reproduced image of this test chart is then observed on a picture… read more tube or other suitable reproducing device. The point in the picture where the lines are no longer visible as separately defined images gives a measure of the system performance with respect to resolution. A quantitative method of measuring the horizontal resolution response of a camera system is based upon the oscilloscope display of the camera output voltage obtained from any single scan line across the vertical wedges of the resolution chart image. By choosing lines that occur at suitable times, the amplitude of the resulting signal can be plotted as a function of the line number of the chart. read less

定价： 127元 / 折扣价： 108 元

This standard is applicable to - Dielectric tests with direct voltages - Dielectric tests with alternating voltages - Dielectric tests with impulse voltages - Tests with impulse currents - Tests with combinations of the above - Capacitance and dielectric loss measurements This standard is applicable only to tests on equipment with a rated voltage above 1000 V. Procedures are given for applying correction factors to convert test data to standard atmospheric conditions. This standard also specifies procedures for testing equipment when external insulation of the test object is to be subjected to dry, wet, or contaminated conditions.

定价： 253元 / 折扣价： 216 元

This Recommended Practice offers users assistance in controlling or modifying the inductive environment and the susceptibility of affected wire-line telecommunications facilities in order to operate within the acceptable levels of steady-state or surge-induced voltages of the environmental interface (probe wire) defined by IEEE Std 776(TM). The methodology, application, and evaluation of results for mitigative techniques or devices in general are addressed for all Specific Type A and Specific… read more Type B coordination methods also defined by IEEE Std 776. read less

定价： 83元 / 折扣价： 71 元

定价： 88元 / 折扣价： 75 元

This document specifies identity-based cryptographic schemes based on the bilinear mappings over elliptic curves known as pairings. Specific techniques include algorithms to compute the pairings and specification of recommended elliptic curves and curve parameters over which the pairings are defined. The class of computer and communications systems is not restricted.

定价： 191元 / 折扣价： 163 元

Reprinted from the proceedings of the I.R.E Vol. 48, NO.8 August 1960. (Also known as 60 IRE 13.S1)

定价： 55元 / 折扣价： 47 元

This standard provides techniques to select wind turbine and wind farm aero acoustic noise measurements, including instrumentation standards and metrology technology, measurement set, measurement procedures, data processing, and noise source data analysis. The scope of measurement covers near-field sound measurement similar to IEC 61400-11 and distance and far-field sound measurement both outside and inside concerned houses or buildings. This standard focuses on amplitude modulation noise,… read more however, guidelines for low-frequency noise including infrasound near-field measurement are provided. IEC 61400-11 provides overall wind turbine noise measurement standards, while this standard focuses more on the aero acoustic noise of wind turbines to avoid overlap with IEC 61400-11. Users of this standard should also be familiar with of ANSI S1.1-1994 (R2004), Acoustical Terminology. read less

定价： 56元 / 折扣价： 48 元