actual “ohmic” series resistance of the wire leads and foils that are in series with
the heart of a capacitor physically, because ESR includes also the effect of
dielectric loss. ESR is related to D by the formula: ESR = Rs = D/ωCs. Where ω
represents “omega” = 2 pi time frequency.
Although it is traditional to measure series inductance of inductors, there are
situations in which the parallel equivalent circuit better represents the physical
component. For small “air-core” inductors, the significant loss mechanism is
usually “ohmic” or “copper loss” in the wire, therefore the series circuit is
appropriate. Nevertheless, for an “iron core”, the significant loss mechanism can
be “core loss”, therefore, the parallel equivalent circuit is appropriate which
being a better model of the inductor.
SPEED
SLOW
DISPLAY
VALUE
MODE
L/Q
CIRCUIT
SERIES
MENU
L 1.2345H
Q 0.6789
TESTING
F : 1.000 kHz
V : 1.000 V
AUTO MANU INT.B OFF
R.H OFF
C.V OFF
Press F4 key to
select the Series
or Parallel circuit
Figure 4-4. Selections of Series & Parallel Circuit
4-4-3. Measurement Displays
The measured results of the LCR Meters can be shown on the LCD monitor in
three ways: VALUE, DELTA%, or DELTA . User can press F2 key to select the
appropriate item for measurement.
LCR-800 Series User Manual
15
VALUE
The LCD monitor will display the measured value of both the primary and
secondary parameter, shown with decimal and units. The resolution of primary
display (L, C, R or Z) is five digits. The resolution of secondary display (D, Q or
R with C) is four digits. The resolution of secondary display (?) is at 2 digits after
decimal point. The message “TESTING” is displayed when a test is in process.
DELTA%
The “DELTA%” shows the percent deviation of the measured L, C, R or Z value
from a stored NOMINAL VALUE. The sign of deviation is indicated.
DELTA
The LCR difference is similar to the DELTA% except that the deviation is shown
in suitable units (ohms, henries, etc).
SPEED
SLOW
DISPLAY
VALUE
MODE
L/Q
CIRCUIT
SERIES
MENU
L 1.2345H
Q 0.6789
TESTING
F : 1.000 kHz
V : 1.000 V
AUTO MANU INT.B OFF
R.H OFF
C.V OFF
Press F2 key to select the
three different measuring
display ("VALUE",
"DELTA%", or "DELTA").
Figure 4-5. Types of measurement display
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