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2.1 IJKWET CERTIFICERING
Test Certificaat nr. TC 5164 : CE Europese IJkwet, n < 10.000, e > 0,3 µV, impedantie > 58 ,
en Toelating nr. T 5170 geen kabellengte begrenzing, geen verplichte EMC voorzieningen
CE markering : Op basis van 50081-1, EN 50082-1, EN 61000-3-2 en EN 45501.
2.2 LOADCELL VOEDING
Spanning : 4,5 - 6,5 VAC, sinus 218 Hz, kortsluitvast
Stroom : 150 mA, max 8 loadcells van 350
Sense return : 6 draads aansluiting, de sense spanning bestuurt rechtstreeks de A/D
converter, daarom wordt de voedingsspanning niet bijgestuurd
Loadcell kabel : 6 draads, per paar getwist, low capacity, folie afgeschermd,
artikel nr. 32 TPST
2.3 LOADCELL INGANG ZIE VOOR AANSLUITINGEN PAG. 24
Impedantie (dynamisch) : 20 M, 10 nF parallel, bestand tegen kortsluiting en volle voedingsspanning
Gevoeligheid : 0,9 nV per schaaldeel; ruis incl. A/D conversie 2,7 nV pp
Ingangsinstelling : 0 . . . 0,25 mV/V tot 2 mV/V in stappen van 0,25 mV/V, zie tabel 1
Meetbereik : 0 . . . 1 mV tot 0 . . . 13 mV, afhankelijk van de ingangsinstelling
Dode last compensatie : max 1 mV/V, 0,25% nauwkeurig hardwarematig instelbaar,
restant tot 0,0007% digitaal met (auto-)zero functie
Lineariteits correctie : contra parabool, instelbaar over het ingestelde netto meetbereik,
bereik 0,09% in + en -, instelbaar per 0,006%
2.4 A/D CONVERTER, DIGITALE VERWERKING
Principe : 21 bit continu integrerende verhoudings meting
Integratie tijd : 2,3 msec. per complete omzetting, 436 Hz
Oplossend vermogen : 1.500.000 schaaldelen effectief beschikbaar voor afregeling, nulstellen,
stilstandmeting, tarrering, interne display aflezing en setpointvergelijking
Data uitgang 15.000 schaaldelen, setpoint data ingang 150.000 delen,
uitgang direct geschakeld max 2.000.000 delen
Stabiliteit (ruis) : 3 schaaldelen pp op 150.000 delen, inclusief voorversterker en A/D converter
2.5 STANDAARD DEMPING, FILTERS
Intern : 4,7 Hz eenpool filter in de A/D converter
Instelbaar : Digitaal tweepool filter instelbaar van 0,13 Hz tot 4,02 Hz in 8 stappen,
zie tabel 2
Automatisch adaptief : Progressief toenemende demping bij naderende stilstand,
oplopend tot 0,07 Hz
Handboek 348-2 V 3.1 Pag. 7 01-09-2006
7


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