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MM560 参数 Datasheet PDF下载

MM560图片预览
型号: MM560
PDF下载: 下载PDF文件 查看货源
内容描述: 多主控数字万用表系列随着PC接口 [MultiMaster Digital MultiMeter Series With PC Interface]
分类和应用: PC
文件页数/大小: 21 页 / 614 K
品牌: EXTECH [ EXTECH INSTRUMENTS CORPORATION. ]
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DC+AC True RMS  
DC+AC True RMS calculates both of the AC and DC components given  
by the expression  
when making measurement, and  
can responds accurately to the total effective RMS value regardless of  
the waveform. Distorted waveforms with the presence of DC  
components and harmonics may cause:  
1) Overheated transformers, generators and motors to burn out faster  
than normal  
2) Circuit breakers to trip prematurely  
3) Fuses to blow  
4) Neutrals to overheat due to the triplen harmonics present on the  
neutral  
5) Bus bars and electrical panels to vibrate  
AC Bandwidth  
AC bandwidth of a DMM is the range of frequencies over which AC  
measurements can be made within the specified accuracy. It is not the  
frequency measurement function, and is the frequency response of the  
AC functions. A DMM cannot accurately measure the AC value with  
frequency spectrums beyond the AC bandwidth of the DMM. Therefore,  
wide AC bandwidth plays an important role in a high performance DMM.  
In reality, complex waveforms, noise and distorted waveforms contain a  
much higher frequency spectrum than its fundamental.  
NMRR (Normal Mode Rejection Ratio)  
NMRR is the DMM's ability to reject unwanted AC noise effect that can  
cause inaccurate DC measurements. NMRR is typically specified in  
terms of dB (decibel). This series has a NMRR specification of >60dB at  
50 and 60Hz, which means a good ability to reject the effect of AC noise  
when making DC measurements.  
CMRR (Common Mode Rejection Ratio)  
Common mode voltage is voltage present on both the COM and  
VOLTAGE input terminals of a DMM, with respect to ground. CMRR is  
the DMM's ability to reject common mode voltage effects that can cause  
digit rattle or offset in voltage measurements. This series has a CMRR  
specifications of >90dB at DC to 60Hz in ACV function; and >120dB at  
DC, 50 and 60Hz in DCV function. If neither a NMRR nor a CMRR  
specification is specified, a DMM's performance will be uncertain.  
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