LCR LQ-9101 User manual
LQ-9101 User Manual
Chapter 1 The General Description
LQ-9101 is a compact LCR measurement instrument that uses the principle of free axis impedance
measurement VI parallel processing and modern components. It has the characteristics of small size
light weight high precision low power consumption and fast measurement speed. It is suitable for
electronic test design electrical maintenance and other occasions to facilitate rapid measurement and
analysis of component performance.
1.1 Basic Performance
Measurement Source Frequency 0Hz(DC) 100Hz 120Hz 1000Hz 10KHz Error ±100PPM
Voltage DC: 0.56V±5%
AC AC RMS: 100mV 300mV 600mV ±5%
Internal Resistance AC DC Constant 100Ω ±5%
Basic Accuracy ± Reading × 0.2%
Measurement Display Range
Resistance 000.0 mΩ—1000 MΩ
Q: 0.000—9999 D: 0.0000—9999.9 θ: -180.00°-- +180.00°
Minimum Resolution
Rs/Rp/Z 0.1 mΩ
100Hz120Hz 0.1P 0.1uH
1000Hz 0.01P 0.01 uH
10KHz 0.001P 0.001uH
Display Valid Digit
Measurement Status Four Valid Digit
Test Status Five Valid Digit
Display
Window 43×29 mm Eective Display Area 37×23 mm
LCD128×64 Automatic Backlight
Update Frequency 3.75Hz
Measurement Terminal
Body Built-in Spring Clip jack: Direct measurement
of the external test socket: Suitable for 3.5mm stereo headphone plug test line Ф
Measurement connection method
Body reed clip jack: Four-wire mode
External test line: Four-wire mode
measurement result display and model
resistance inductance capacitance Q value D value phase angle
Ls(Cs)-Rs-Q model Lp(Cp)-Rp-D model Z-θ model
measurement time
from the of the measured component the main parameter is about 1 second parameter ≥1 second
power supply and a charging
Set 3.7V / 450mAH rechargeable polymer lithium ion battery
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LQ-9101 User's Manual
normal operating voltage of > 3.5 ± 0.1V when the normal operating voltage of the bridge is lower than
the boot can not be
Charging power supply DC5V 3.5mm inner and outer core plugs inner + outer - charging time of Ф
about 2 hours
The power consumption of
the power consumption of maximum27mA (dark ambient backlight automatic adjustment of the brightest
non-test state)
Basic operating current 23mA (light environment backlight automatically adjust the most Dark non-test
state)
Power OFF state consumption < 1uA Automatic shutdown time
15 ± 2 minutes automatic shutdown pre-reminded time 1 minute The maximum size and weight of
the whole machine 103 × 69 × 24 mm 180g
1.2 Panel function conguration
shown in Figure 1 Each functional part of the instrument (charging jack charging indicator power
switch on the top side and external test cord outlet on the lower side)
Fig. 1
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User Manual
1.3 Display interface description
Figure 2 shows the integrated display interface. The content description is shown in the
gure.
Figure 2
Figure 3 is the Z-θ display interface and the interface mark is the lower right corner Z. For the □
description of the content see the
gure 3
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User Handcopies
FIG 4 is a tandem parameter interface the interface is marked as the lower right corner S see gure □
Description
4
5 is parallel parameter interface the interface is the lower right corner ag P illustrated5 see □
Description
in FIG.
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LQ-9101 User Manual
Complex Impedance and Equivalent Circuit
2.1 Complex Impedance Parameter Description
The measured component impedance can be regarded as the complex value of a series model ie the real
part resistance Rs and imaginary The series of reactance Xs is represented by the vector diagram 6 .
Figure 6
Xs can be either capacitive reactance or inductive reactance related to frequency f
XC = 1 / 2 f C лXL = 2 f Lл
2.2 Equivalent parameter description
For impedance Z the series equivalent of the series model can be used. Z = Rs + jXs
The expression of can also be expressed by the parallel equivalent parameter Z = Rp || jXp of the
parallel model. The form is dierent but |Z| and θ are the same ie the two models are equivalent.
In the equivalent two models the relationship between the parameters Rs and Rp Xs and Xp and the
quality factor Q or loss factor D is shown in Fig. 7. In the gure F is the frequency.
The conversion relation described in the chart is for reference when the user understands it and the
bridge directly outputs the corresponding parameter in dierent display modes without user conversion.
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7
Part III describes testing accuracy
3.1Ae accuracy of impedance regularity as shown in FIG.
Figure 8
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The accuracy of L C in addition to the impedance also relates to D (or Q):
Ae(LC) = Ae *√(1+ D^2)
When D<0.1 Ae(LC) ≈ Ae
the accuracy of R in addition to impedance is also related to D(or Q):
Ae(R) = Ae* *√(1+ Q^2)
When Q<0.1 In the case of Ae(R) ≈ Ae
DC Q can be considered to be innitely small ie equal to Ae
D. Accuracy
De = Ae/100 ---- Condition D<0.1
De = (1+D)*Ae/100 -- - Condition D> 0.1
Operation and use of the fourth part
Warning: When measuring should avoid the external signal DC voltage is added to the measuring mouth
prevent the bridge from damaging.
4.1 The charging
bridge has a built-in 450mAH polymer lithium-ion battery. The charging interface is a 3.5mm DC
socket. Input 5V DC power the positive pole of the core through a random USB to DC charging cable
can be connected to the computer USB port to charge you can also use a mobile phone charger with USB
charging output charging treasure and other charging power. The charging indicator red indicates
charging and green indicates charging is complete.
After the built-in rechargeable battery is fully charged the accumulated time for the use of the bridge for
normal measurement is not less than 8 hours. Allows the bridge to be used while charging without
aecting the stability and accuracy of the measurement.
4.2 startup and shutdown
bridge supply controlled by a key. Long press the key the built-in buzzer "drip" turn on and then long
press the shutdown. The bridge power supply has an automatic shutdown feature. The typical automatic
shutdown time is 15 minutes. The built-in buzzer one minute before the automatic shutdown prompts two
short “drip” sounds to remind the user that the user is about to shut down. If you do not want to shut
down press the power control button briey. The buzzer will beep once this time the automatic shutdown
will be eliminated the automatic shutdown time will be re-timed and the state will continue to be turned
on. After power on the display is on the word “WELCOME” appears and the copyright information
appears. Then it enters the measurement state.
4.3 Clearing the Short Circuit and Clearing the Open Circuit
4.3.1 Clearing the Basic Description
Bridge The key is the short-circuit clear and open-circuit clear control keys which share one key. When ○
the test port is short-circuited or open-circuited the short-circuit impedance is not zero due to the eects
of the hardware's own parasitic parameters and the open-circuit impedance is not innite but there is a
certain parasitic impedance. Typical parasitic impedance values are several mΩ or less at short circuit
tens of MΩ or more at open circuit and when the device under test is at mΩ and MΩ level the parasitic
impedance will aect the accuracy of the test results (non-low-end and high-end The measured impedance
is less aected by spurious impedance. Therefore it is necessary to make the short-circuit clear and open-
circuit clear once for dierent frequencies.
The allowed thresholds for the bridge are as follows:
Short circuit clear <100mΩ;
Open circuit clear frequency 1KHz and below> 10MΩ clearance
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10KHz > 5MΩ. Clearing the impedance value outside the threshold does not work.
When measuring with a local jack an external Kelvin clip or an external table pen it is necessary to
clear this connection mode. After the clear operation the clear data with the conditions of the current
measurement method and the test level level* are saved. When the measurement is still done in this way it
is not necessary to clear each time; when changing the measurement connection mode the data must be
cleared again. Zero operation.
4.3.2 Zeroing the local measurement connector to clear theshort circuit:
Insert the shorting piece (or a good conductor) into the body socket to conrm that the connection is
good. When the display is stable press C and the series parameter is zero or minimum. 0.XXXmΩ+ ○
0.000uH.
Open circuit clear: open the socket without inserting any components. When the display is most stable
press C. The parallel parameter is the largest and the display is >1000MΩ// 0.000P.○
4.3.3 Kelvin Test Clip Clear
When using the Kelvin clip measurement method to clear or measure the two test wires should be
stranded. This approach helps to reduce the uncertainty of the test line's parasitic parameters due to
changes in the attitude of the test line. Sex especially when measuring low impedance or high impedance
should be twisted. For intermediate impedance stranding is not so important.
Specially pointed out that when the two clips of the Kelvin clips are snapped to one another and are
short-circuit-cleared attention should be paid to following the order of the terminal names shown in Fig.
9 that is the current terminal is next to the current terminal and the voltage terminal and the voltage
terminal are next to each other. Do not alternate. For self-made external test leads refer to 4.5.4.
Figure 9
4.3.4 External two-wire table pen to clear
external two-wire table pen measurement method the contact resistance is aected by the surface
conductivity of the pen tip operating pressure and other factors not suitable for low impedance
measurement so the short-circuit clearing eect is not ideal. The operation of short-circuit and open-
circuit clearing is the same as other measurement methods. The parasitic parameters of the external two-
wire meter pens will also cause uncertainty due to the change of the attitude of the two pens. Therefore it
is also required to glue the two pens together as much as possible.
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