LQ-9101
User Manual
7.14 What is the use of level selection?
The bridge provides multiple measurement signal levels (internal resistance 100 ohms) for two
purposes: first, Since the measurement signal is an alternating signal, the voltage applied to the device
under test has a negative half cycle. For some devices that require a reverse voltage, such as a tantalum
capacitor and a solid capacitor, using a low level means that the device is applied to the device under test.
The upper reverse voltage is very small and will not damage the components. The second is when it is
used to check the circuit board, that is, it is measured on the road. The small signal can avoid the non-
linear effects of the semiconductor components and is convenient for on-the-road analysis.
7.15 What is the use of V magnification and I magnification in the upper left corner of the default
interface of the bridge?
Refers to the amplifier magnification of the bridge voltage channel and the current channel. You can
understand the working status of the bridge through the magnification factor. concern. For those friends
who wish to have a deeper understanding, it has a role that if the 0.6V level is used, the two
(amplification) values must have a value of 1, and if not, it may measure poor contact and re-contact. (Or
re-insert it).
7.16 What is the lowest voltage and current in the bridge Z, S, P display interface?
The actual voltage of the output signal of the bridge and the current fowing through the measurement
node. If a resistor is measured, it shows the signal voltage drop across the resistor and the signal current
through the resistor.
7.17 What is the relationship between the parameters displayed on different interfaces of the bridge?
Just know that all the parameters Z, Q, D, and θ are irrelevant to the parametric model, for example,
there is no display of the design D parameter in the S interface. If you need to know the D parameter, you
can look at the other display interface and it is the same.
7.18 I have a Fluke multimeter, which is a world famous brand. Measured an electrolytic capacitor. Why is
the measured value of the bridge inconsistent with the multimeter?
This is because the two devices have different measuring frequencies, and the parameters of the
electrolytic capacitor at different frequencies are different. Multimeter test principle is various, impedance
method, charge and discharge method, free oscillation method ... ... different principles, not specifically
check the multimeter instructions its frequency is not known. Therefore, don't suspect that the multimeter
is a world famous brand and you are actually skeptical about the results of the bridge. In fact, they are all
correct, but the measurement conditions are different (such as different measurement frequencies). By the
way, under the same measuring frequency conditions, the gap between the bridge and the multimeter will
be smaller, not necessarily very close or equal. In this case, the bridge measurement result is more
accurate.
7.19 Does the LQ-9101 need to be concerned about the deterioration of accuracy caused by aging?
Generally, it is not necessary to care. The bridge is said to be highly accurate and is relative. After all,
it is still at the level of a few thousandth. The aging factor of the bridge is mainly the range resistance. Its
