61
Measuring Equipment
red values. To minimize these impacts, the compensation
of impedance errors caused by adapters and leads beco-
mes necessary.
To compensate or eliminate this measurement error, it is
recommended to perform an open and short compensa-
tion (OPEN/SHORT compensation) with the LCR bridge
HM8118. For the open compensation, the measurement
adapter is connected without component. For the short
compensation, insert the enclosed short circuit board into
the two adapter contact slots (measurement contacts).
The compensation values that are measured during the
compensation process will be stored in the memory of
the LCR bridge HM8118 and are valid until another com-
pensation is performed. If any changes to the measure-
ment setup are implemented, it becomes necessary to
perform a new compensation. For more information about
the OPEN/SHORT compensation, see chapter 7.2.
8.2 Kelvin-Test Lead HZ184
The Kelvin test lead with Kelvin clamps allows for the
4-wire measurement of components that could otherwise
not be tested by means of conventional test adapters (for
instance, due to their size). The test lead is directly connec-
ted to the front panel BNC connectors via the four front pa-
nel BNC sockets of the LCR bridge HM8118. The leads of
the red clamp are connected to H
CUR
and H
POT
, the leads
of the black clamp to L
POT
and L
CUR
. This equipment is in-
cluded in delivery.
For frequency dependent components, make sure to perform
an OPEN and SHORT compensation for each of the 69 test
frequencies.
Fig. 8.4: Kelvin test
lead HZ184
Technical Data HZ184
Function:
Kelvin test lead to operate (via 4-wire con-
nection) with LCR bridge HM8118
Measurable components: Resistances, coils or capacitators
Frequency range:
20 Hz to 200 kHz
Test lead length
approximately 35 cm
Connectors
BNC sockets (4), clamps (2)
Safety standards:
EN61010-1; IEC61010-1;
EN61010-031; IEC61010-031
Environmental conditions: Contamination Class 2, internal use
Operating temperature:
+5 °C to +40 °C
Temperature limits:
-20 °C to +70 °C
Weight:
approximately 170 g
8.2.1 Compensation HZ184
Due to their design, the test lead HZ184 and the terminal
clamps have a fringing capacitance, a residual inductance
and a residual resistance which impacts the accuracy of
the measured values. To minimize these impacts, the com-
pensation of impedance errors caused by adapters and
leads becomes necessary.
To compensate or eliminate this measurement error, it is
recommended to perform an open and short compensa-
tion (OPEN/SHORT compensation) with the LCR bridge
HM8118. For the open compensation, the test lead wit-
hout component and without the measurement clamps are
attached without being connected to each other (separate
arrangement).
For the short compensation, the two connecting clamps
are connected to each other. The compensation values
that are measured during the compensation process will
be stored in the memory of the LCR bridge HM8118 and
are valid until another compensation is performed. If any
changes to the measurement setup are implemented, it
becomes necessary to perform a new compensation. For
more information about the OPEN/SHORT compensation,
see chapter 7.2.
8.3 4-wire Transformer Test Lead HZ186
For frequency dependent components, make sure to perform
an OPEN and SHORT compensation for each of the 69 test
frequencies.
Fig. 8.5: Short compensation HZ184
Fig. 8.6: Connecting the measurement adapter to the LCR bridge
Содержание HM8118
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