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Measuring Equipment
8 Measuring
Equipment
Measuring components requires the use of suitable mea-
surement adapters. This will be connected firmly with
the LCR R&S®HM8118 via the four front panel BNC
connectors:
❙ H
(High Potential)
Pot
❙ H
(High Current)
Cur
❙ L
(Low Potential)
Pot
❙ L
(Low Current)
Cur
Fig. 8.1: Front panel BNC connectors
For measurements of wired components, it is recommen-
ded to use the test adapter R&S®HZ181 whereas for SMD
components, it is recommended to use the test adapter
HZ188 that is included in delivery.
It is essential to discharge all components before connecting
them. Do not apply external voltages to the measurement inputs
(BNC sockets on the instrument front panel). During a measure-
ment, do not touch the component directly with hands or indi-
rectly with objects as this may distort the measurement results.
Always remove measurement accessories, such as test adapter
for component measurements, by pulling it forward.
For precision measurements, it is recommended to use
measurement adapters for 4-wire measurements. A 2-wire
measurement is not as accurate as a 4-wire measurement.
It is possible to minimize parasitic impedances by using
the appropriate measurement adapter. To maximize the ac-
curacy, it is recommended to perform an OPEN/SHORT/
LOAD compensation following each change to the mea-
surement configuration. This is also recommended for any
change to the measurement frequency. Alternatively, you
can use test leads instead of a measurement adapter. The
component to be measured can be connected to the LCR
bridge R&S®HM8118 by means of a suitable test lead. The
test lead will be connected via the four front panel BNC
connectors. Please also note that a 2-wire measurement is
not as accurate as a 4-wire measurement. Since any cable
is likely to see individual losses which ultimately distorts
the original measurement result due to inductive and ca-
pacitive properties (especially due to the length), it is re-
commended to measure a component with R&S®HM8118
accessories.
Connecting a conventional coaxial cable is not recommended since
the measurement result may be modified by other cable types,
changed cable length etc. Additionally, due to the OPEN or SHORT
calibration, the bridge cannot fully compensate such impacts.
60
8.1
4-Wire Test Adapter R&S®HZ181 (Including
Short Circuit Board)
The 4-wire test adapter (including the short circuit board)
is used to qualify wired components. The measurement
adapter converts the configuration of a 4-wire measure-
ment to a 2-wire measurement. The measurement adap-
ter is directly connected to the front panel BNC connec-
tors via the four front panel BNC sockets of the LCR bridge
R&S®HM8118. Insert the component to be measured with
its connection wires in the two provided contact slots
(measurement contacts). The following figure shows the
connection of this test adapter. This equipment is optional
and not included in delivery.
Fig. 8.3: Connecting a measurement adapter
Technical Data R&S®HZ181
Function:
Measurement adapter to operate (via 4-wire
connection) with LCR bridge HM8118
Measurable components:
Resistances, coils or capacitators with axial
or radial connecting wires
Frequency range:
20 Hz to 200 kHz
Maximum voltage:
± 40 V maximum value (AC+DC)
Connectors:
BNC sockets (4), measurement contacts (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 200 g
8.1.1 Compensation R&S®HZ181
Due to its design, the measurement adapter R&S®HZ181
has a fringing capacitance, a residual inductance and a re-
sidual resistance which impacts the accuracy of the mea-
sured values. To minimize these impacts, the compensa-
Fig. 8.2: 4-wire test
adapter R&S®HZ181
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