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In addition to the component type selection test signal level is
also adjusted when in-circuit measurements are made (see
below 7.2.4). Measurement mode can also be set manually to R,
L, C, Z and Large Cap. The last mode is only for measuring
capacitance values larger than 0.5
μF
(see section 7.2.10 below).
In Auto mode for inductors quality Q factor is displayed for Q>1
and series Resistance Rs for Q<1, and for capacitors, loss tangent
for C < 0.5
μF and ESR
for C >0.5
μF.
Automatic secondary
parameter selection does not work if the Test Signal is set to
Auto, Rs or Rp are used as the secondary parameter in this case.
This menu item allows to manually select the frequency of the
test signal. In Auto mode, the device automatically selects a
frequency of 100Hz, 1 kHz or 10 kHz, depending on the rating
and type of the component. For electrolytic capacitors 120 Hz is
used for capacitance measurements and 100kHz for ESR. Users
can also manually select the test frequency. A higher frequency
should be used for measuring small values of capacitances and
inductances as well as ESR. Lower frequencies are used to
measure large inductance and capacitance values. Resistance
measurements are always made at 1 kHz unless
RDC+LED
mode
is selected.
For more stable readings, select 1.0 Vrms or Auto signal level.
Auto is best for measuring loose components and in-circuit
measurements of R, C, L. When measuring a component on a
PCB, high test signal may open p-n junctions of semiconductor
components. This, in turn, may cause error in the measurements.
In order to avoid effect of the p-n
junctions, the signal level is
automatically reduced to 0.1 V
peak-to-peak and the impedance is
re-measured. In this case, the screen shows the diode symbol
and the direction of the p-n junction as shown below.
Increased measurement time results in more stable readings,
reduced time results in faster updates on the screen.
This is used to select the equivalent circuit depending on the
characteristics of the element. For Capacitance measurements in
Automatic equivalent circuit regime and Auto signal level Serial
circuit is used for impedance values lower that 100 Ohms. If
signal level is not in the Auto regime, serial equivalent circuit is
Summary of Contents for LCR-Reader MPA
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