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Motech
MT-4080A
LCR meter
Some digital multimeters have facilities for testing
inductance, capacitance and resistance but none
really do a good job for all three, particularly as far
as inductance is concerned. This is where the
Motech MT-4080A LCR meter comes into its own.
T
HE MT-4080A is a multimetersized instrument with a large
liquid crystal display and eight
pushbuttons on its control panel. As
well, there is a three-way socket with
large contacts to take the measurement
adaptors. Of course, some components
with suitable leads can be plugged
straight in but most component measurements will be taken using one of
the adaptors.
All told, up to 10 component par
ameters can be measured: AC impedance and DC resistance from zero
up to 9999MΩ; serial and parallel
inductance from 0.000µH up to 9999H;
serial and parallel capacitance from
0.000pF to 9999F; equivalent series
resistance (ESR) from zero to 9999Ω;
Dissipation factor (for capacitors) from
0 to 9999; Quality factor (for inductors)
from 0 to 9999; and phase angle from
-180° to + 180°.
72 Silicon Chip
Not only can all these parameters be
measured but you can also use one of
five test frequencies: 100Hz, 120Hz,
1kHz, 10kHz and 100kHz. The two
lower frequencies are important when
measuring ESR of electrolytic capacitors while 100kHz is important when
measuring small inductors and dissipation factor in the smaller capacitors.
At most times though, the chosen test
frequency is likely to be 1kHz.
The test voltage level is also select
able, at 1V, 250mV or 50mV RMS or
1V DC (for DC resistance measurements). Furthermore, if you are making
measurements on a component that
is varying, you can select fast or slow
measurement speeds: 2.5 or 4.5 meas
urements/second.
The LCD panel will show two par
ameters for each measurement, plus
the signal level and frequency. For
example, when measuring a capacitor
it will display the capacitance in pF,
nF, µF or F (Farads) plus the Dissipation factor or ESR. Similarly, for an
inductor, it will display the inductance
in µH, mH or H (Henries) plus the Q
or ESR.
Accuracy of the MT-4080A is quoted
as ±0.2%. The instrument also has a
range hold and relative modes which
can be handy when selecting components against a standard value.
Two adaptors are available for
measurements plus a shorting bar attachment. The first adaptor is a 4-wire
probe for surface mount components
while the second is a 4-wire probe for
testing standard leaded components.
Power comes from two AA cells
which may either be alkaline or rechargeable NiMH. A constant current
charger is also supplied.
All told then, the Motech MT-4080A
is a well-thought out instrument that
is very straightforward to use. We used
it in our laboratory for several weeks
and found it a very reliable unit.
The MT-4080A is priced at $1142
plus GST. For further information,
contact Westek Industrial Pro
ducts,
Unit 2, 6-10 Maria Street, Laverton
North, 3026. Ph (03) 9369 8802; fax
SC
(03) 9369 8006.
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