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Gossen Metrawatt GmbH
METRACELL BT PRO
The multimeter test probes can be used for measurements
Kelvin Probes (Z227D) for 4-Wire Measurement
Electrical resistance is a dipole which can generally be measured
using two poles. A measuring current of predetermined magnitude
is directed through the device under test to this end and the resul-
tant voltage drop is measured. The respective resistance value is
derived from the quotient of these two values. The two points
between which voltage is measured are decisive as regards the
results of the measurement. All resistances between these two
points (e.g. cable resistance) add to the measured resistance
value.
The included Kelvin probe can be used for measurement in order
to avoid this. In order to get the measuring device’s voltage mea-
surement potential points as close as possible to the device under
test, the probe has separate connections for current supply and
voltage measurement. This type of 4-pole connection is known as
connection according to Kelvin.
Table 4:
Kelvin Probes
Attention!
!
Never touch the conductive ends of the Kelvin probes.
Attention!
!
The Kelvin probes may only be used at the METRACELL
BT PRO battery tester for the measurement of “resistance”
(
39).
Connection and use of the Kelvin test probes are described within
the context of the “resistance” measurement
Attention!
!
Only use the Kelvin probes accessory (Z227D) in CAT O
measuring category environments.
The Kelvin probes (Z227D) may not be used in measuring
categories CAT II, III or IV.
Measuring category
See labeling on device