LQ-9101
USER MANUAL
4.4 The measuring
bridge is a fully automated working method. Range determination, impedance property
determination, equivalent parameter conversion, etc. are all completed by the program. According to the
actual needs of users, the operation of the items are: selection frequency, select the level level *.
The machine body has the best characteristics of its own measuring socket and should be used with
priority. The external test leads are suitable for situations where it is not convenient to use the body's own
receptacle measurement, such as large-size components, on-line inspection, etc.
4.4.1to read the measured value
In order to facilitate the user reading, four display interface design, with the control key M mode control
○
loop, the interface details,
see 1.3 section.
Based on the component loss values, the possible error range of the measured parameters is estimated as
described in 3.1.
Note: In the S interface and the P interface, the values of R and R\L\C are exchanged according to the
main features of the components. For example, the measuring resistor, the resistance is the main
parameter *, will automatically be displayed in large font in the middle, the distributed capacitance of the
resistor is a secondary parameter *, Cs or Cp is displayed in small font in the upper left corner.
4.4.2 Stability of measurement results
Generally, low-impedance series parameters are more stable than parallel parameters, and high-
impedance parallel parameters are more stable than series parameters. When Q value is high, L or C is
more stable than R parameters. In contrast, R parameter ratio L or C is stable; when the Q value is near 1,
the stability of the parameters is best. This is a general rule. Some parameters are unstable under certain
conditions and are normal.
Some unstable conditions are caused by improper measurement methods.
Coil type components should avoid environmental interference magnetic fields and high-impedance
components, and also need to consider avoiding the interference of the surrounding electric field.
Temperature-sensitive components should avoid direct hand contact with components and measure under
relatively stable conditions; when DCR* is measured, The micro-resistance should fully consider the
infuence of the thermo-electromotive force, pay attention to inserting and extracting the frictional heat,
the imbalance of heat caused by the hand-contact local, when these factors are unavoidable, it should wait
for the reading to be basically stable and the time may be longer.
4.4.3 Effects of clearing accuracy
Impact of short-circuit clearing on measurement:
Short-circuit clearing has a significant effect on low-impedance measurements. If the actual resistance of
the short-circuited piece (short-circuited line) is 10mΩ instead of zero, measure 100mΩ after clearing.
The result will be 90 mΩ, measuring 6mΩ and will show -4 mΩ.
Note: Since the negative number
