有效值电压表URE2 RMS Voltmeter

　　德国罗德与施瓦茨Rohde & Schwarz

　　真有效值测量AC和AC + DC 高速More than 30 measurements/s 高精度四位半显示或模拟显示，档位可选择50uV - 300V 高通、低通滤波器宽带有效值电压表，10Hz - 25MHzA patented rectifier circuit allows measurement of signals with a crest factor of up to 7 and frequencies of up to 25 MHz. 方便的菜单指引操作Relative measurement, maxima/ minima Use of commercial probes, taking into account their division factor in the displayed result 通讯接口IEEE488 应用领域

　　Level measurements in audio range Interference measurements on switch-mode power supplies Measurement of extremely fast dialling signals and detection of simultaneously transmitted supply voltages in radiotelephony Automatic quality control of audio and video tapes High-frequency measurements in digital magnetic storage and optical data storage Peak weighting in video measurements (sync signals) Secondary calibration standard 测量精度

　　A patented rectifier circuit with microprocessor-controlled autocalibration makes for the outstanding measurement characteristics of URE2 and URE3. In order to further enhance the accuracy, correction factors are determined for each instrument and measurement range and stored in a nonvolatile memory.

　　A zero function allows noise voltages and the inherent noise to be compensated for, the measurement accuracy being thus increased in particular at low levels.

　　The measured frequency value is used by URE3 for an internal frequency response correction. This method increases the accuracy mainly at the higher frequencies. Distortion-free measurement of signals is ensured by:

　　high input impedance low input capacitance highpass and lowpass filters that can be switched in to suppress hum or high-frequency noise voltages