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Gossen Metrawatt PROFITEST MXTRA Manual

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34 GMC-I Messtechnik GmbH
10.5 Aardweerstandmeting op stroom werkend – Meten van de aardelektrodespanning (functie U
E
)
Deze meting is alleen mogelijk met sonde, zie hoofdstuk 10.4.
De aardelektrodespanning U
E
is de spanning die op de aardelek-
trode tussen de aardaansluiting en de referentieaarde optreedt,
als er tussen de buitenste geleider en de aardelektrode een kort-
sluiting ontstaat. De berekening van de aardelektrodespanning is
voorgeschreven in de Zwitserse norm NIV/NIN SEV 1000.
Meetprocedure
Voor de berekening van de aardelektrodespanning meet het
apparaat eerst de aardlusweerstand R
ESchl
en meteen daarna de
aardingsweerstand R
E
. Het apparaat bewaart beide meetwaar-
den en berekent hieruit volgens de formule
de aardelektrodespanning en geeft deze op het display aan.
Meetfunctie kiezen
Gebruiksmodus kiezen Meetbereik kiezen
Aansluiting
Aangesloten worden: 2-polige adapter en sonde
Parameter instellen
q Meetbereik: 10 Ω / U
E
q Aansluitingstype: 2-polige adapter + sonde
q Contactspanning: UL < 25 V, < 50 V, < 65 V, willekeurig instel-
bare spanning zie hoofdstuk 5.7
q Golfvorm meetstroom: hier alleen sinus (volledige golf) !
q Netvorm: TN/TT, IT
q Overzetverhouding: hier niet van belang
Meting starten
Opmerking
Als de 2-polige adapter verkeerd is
aangesloten, verschijnt het volgende
diagram in beeld.
P
R
O
F
I
T
E
S
T
Ri
W
a
t
e
r
l
e
i
d
i
n
g
SE
2
E
1
B
U
E
U
N
R
E
⋅
R
ESchl
--------------------=
R
E
Limiet / grenswaarde:
R
E
> Limiet / grenswaarde
U
L
⏐ R
L
… 34 …


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