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applied on the red terminal. The bias voltage works only
when the instrument on capacitance measurement
Polarisation (Bias)
mode.
A DC bias voltage can be superposed to the test
Measuring function selection
signal. Electrolytic and tantalum capacitors need
a positive bias voltage for accurate measurement,
The desired test function is selected by push buttons (12)
although the test voltage of the HM8018 is not
and (14). The push button (12) gives access to the main
high enough to damage the components. The
parameter (R, L or C), The push button (14) allows a
internal 1 V
secondary parameter measurement
DC
measurements as close as possible to reality. The
phase).
In order to measure D parameter the instrument needs at
internal bias voltage in addition allows performing
first to be set to capacitance measurement mode, on the
measurements on semiconductors junctions. To
other way, Q parameter will be displayed.
activate the bias voltage, press the BIAS button
. The ON LED indicator will light up. Pressing
Auto-measurement function
this key a second time disables the bias voltage.
However, make certain that the capacitor being
The HM8018-2 is able to automatically determine the
tested is connected with the correct polarity, DC
component type in most cases. 3 different automatisms
voltage positive pole is applied on the red terminal.
exists: the automatic impedance range selection (see the
The bias voltage works only when the instrument
section
« Auto-ranging»),
on capacitance measurement mode.
(series/parallel) selection (see the section « passive
components »), and the automatic function selection. These
Measuring function selection
three automatisms are simultaneously activated when the
instrument is set in automatic mode with the RANGE
The desired test function is selected by push but-
AUTO key (7). Then the user can change function or mode
tons
and
that disables their respective automatism. The manual range
to the main parameter (R, L or C), The push button
selection disables the three automatisms.
allows a secondary parameter measurement
When the instrument is on automatic mode the function
(Q/D, impedance or phase).
choice depends on the impedance module, phase angle as
In order to measure D parameter the instrument
well as the quality factor .The diagram below shows the
needs at first to be set to capacitance measure-
choice made by the instrument.
ment mode, on the other way, Q parameter will
be displayed.
Auto-measurement function
The HM8018 is able to automatically determine
the component type in most cases. 3 different
automatisms exist: the automatic impedance
range selection (see the section Auto-ranging),
the automatic mode (series/parallel) selection
and the automatic function selection. These three
automatisms are simultaneously activated when
the instrument is set in automatic mode with the
AUTo key
. Then the user can change function or
mode that disables their respective automatism.
The manual range selection disables the three
automatisms.
When the instrument is on automatic mode the
function choice depends on the impedance mo-
dule, phase angle as well as the quality factor.
The following diagram shows the choice made by
the instrument.
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bias voltage allows to perform
(Q/D, impedance or
the
automatic
. The push button
gives access
manuals search engine
O p e r a t i o n o f t h e H M 8 0 1 8
jX
Q = 500
D = 0,002
mode
Q = 500
D = 0,002
Calculation functions
Calculation functions
Apart from displaying normal values as resistance, inductance or
Apart from displaying normal values as resi-
capacitance, the HM8018-2 can display relative deviations and
stance, inductance or capacitance, the HM8018
percentages. It is not possible to use these calculation modes for
can display relative deviations and percentages.
other functions than the three previous values. The deviations
It is not possible to use these calculation modes
and percentages are displayed in relation to the two stored values
for other functions than the three previous values.
A and B.
The deviations and percentages are displayed in
relation to the two stored values A and B.
The procedure to obtain relative measurement is as follows:
1) Connect the component corresponding to the reference
The procedure to obtain relative measurement
value.
is as follows:
1) Connect the component corresponding to the
2) Store the value (memory A) by pressing on the STORE key,
reference value.
then press the A key.
3) Press on the A key. The indicator -A lights up and the
2) Store the value (memory A) by pressing the
display shows the value (Measure – A).
STORE key and then button A.
A direct percentage measurement is possible, it is only to use the
3) Press button A. The A LED lights up and the
÷B key instead of the –A key in the previous procedure. Then the
display shows the value Measure – A .
instrument displays the value 100*Measure/B in %.
A direct percentage measurement is possible, it is
To obtain a deviation in % proceed as follows:
only to use the ÷B key instead of the –A key in the
previous procedure. Then the instrument displays
1) Connect the component corresponding to the reference
the value 100*Measure/B in %.
value.
D = Q = 1
|Z| = 1000 Ω
D = Q = 1
Subject to change without notice
D = 500
Q = 0,002
R
D = 500
Q = 0,002
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