GETTING
STARTED
29
Frequency factor
in inductor
measurement
When an inductor is measured at a frequency
much lower than that for which it is designed (for
example, an HF choke tested at AF), the inductor
tends to behave as an inductive resistor. In these
circumstances, measurement accuracy is widened
by (1 + 1/Q) where Q is the quality factor.
Air-cored coils
Air-cored coils can pick up noise very easily,
therefore they should be kept well clear of any test
equipment that may contain power transformers
or display scan circuitry. Also, keep the coils away
from metal objects which may modify inductor
characteristics.
Iron-cored and
ferrite inductor
The effective value of iron-cored and ferrite
inductors can vary widely with the magnetization
and test signal level. Measure them at the AC level
and frequency in use. When core materials are
damaged by excessive magnetization (for example:
tape heads and microphone transformers), check
that the test signal is acceptable before connection.
LCR-8101
User
Manual
30
B
ASIC MEASUREMENT
Basic measurement measures DUT in numerical
style. Advanced measurements are available in
Pass/Fail test mode (page52), where measurement
results are compared with user-defined limits, and
in Graph mode (page75), where measurement data
is displayed in graphical representation.
Measurement item Measurement combination................................. 31
Series/Parallel circuit models............................. 32
Resistance (R) and Conductance (G = 1/R) ........ 34
Capacitance (C) ................................................. 35
Inductance (L) ................................................... 36
Reactance (X) and Susceptance (B = 1/X) .......... 37
Impedance (Z) and Admittance (Y = 1/Z)........... 38
Quality factor (Q) and Dissipation factor (D) ..... 39
Angle (
θ
) ........................................................... 40
Measurement
overview
Enter measurement mode .................................. 41
Display overview ................................................ 42
Show circuit model or scale (pass/fail) .............. 43
Measurement
configuration
Select measurement item ................................... 44
Set measurement range to Auto ......................... 45
Set measurement frequency ............................... 46
Set measurement voltage ................................... 48
Run measurement Select Single measurement ................................ 49
Select Repetitive measurement .......................... 50
Hide drive Voltage/Current ................................ 51