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ES51911 Scheda tecnica(PDF) 7 Page - Cyrustek corporation

Il numero della parte ES51911
Spiegazioni elettronici  11,000 Counts Auto DMM
Download  29 Pages
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Produttore elettronici  CYRUSTEK [Cyrustek corporation]
Homepage  http://www.cyrustek.com.tw
Logo CYRUSTEK - Cyrustek corporation

ES51911 Scheda tecnica(HTML) 7 Page - Cyrustek corporation

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v1.2
11/09/06
7
1.1.3 HCF signal detection
ES51911 provides detection of high-crest-factor (HCF) signal in ACV mode. When this
function is enabled, ES51911 senses the signal and determines it as HCF if the Vpp is
large enough. Once the signal is determined as HCF, ES51911 will jump up one
measuring range regardless of current measurement value. It takes 60ms to jump one
range up. The jumping up process will continue until the maximum range is reached.
With HCF detection, a more accurate result could be obtained. For example, when a
input signal with Vpp=500V, Vrms=100V(CF=5) was applied, traditional 4000 counts
DMMs might stay at 400V range but shows counts with the amount of error up to 10%
or even bigger. The error rises from limited input/output swing at internal ADC. With
HCF detection, DMM will stay at 4000V and exhibits more accurate results.
In addition to accuracy improvement, HCF will speed up the measuring process for
high voltage signals. For example, a 1000Vrms is applied, ES51911 will take about
180ms (3 HCF jumps) to enter 1100.0 V range. And it takes 1 or 2 measuring processes
to obtain the stable result. Thus a stable LCD reading could be obtained within 1 sec.
In determining whether the input signal is HCF, ES51911 senses the signal at VR1 for
fast response. However if a signal consists of a small ac part and a large enough dc part,
ES51911 might incorrectly treat it as HCF. This could incur range looping phenomenon,
i.e., the measurement could not settle to a specific range.


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