National Instruments DAQMeter DAQCard-4050 User Manual
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Contents
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Chapter 3 DMM OperationDAQMeter DAQCard-4050 User Manual3-6 ©National Instruments CorporationThe impedance in each of these ranges is 1 MΩ. The DC component inany of these ranges can be as high as 250 VDC.Accuracy ConsiderationsThe AC voltage measurement accuracy is dependent on many factors,including the signal amplitude, frequency, and waveform shape(or crest factor). Each of these factors, and their effects on yourmeasurements, are discussed below. In addition to these factors,consider the effects of the source impedance of your circuit. Theseeffects are described in the Input Impedance section earlier in thischapter.Frequency ResponseThe accuracy of the DAQCard-4050’s AC voltage measurements is afunction of the input signal’s frequency. Table 3-3 shows the additionalmeasurement errors associated with different frequency ranges. Theseerrors are for full-scale, sine wave inputs.Table 3-2. AC Input Range AccuracyInputRangePercent ofReading ErrorPercent ofRange ErrorOverrange20 mV rms 0.3% 0.1% 22 mV rms200 mV rms 0.3% 0.1% 220 mV rms2.0 V rms 0.4% 0.2% 2.2 V rms25 V rms 0.4% 0.2% 27 V rms250 V rms 0.3% 0.1% 250 V rms |
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