I. Overview
Main differences between LJD-B High Frequency Q Meter and LJD-C High Frequency Q Meter
LJD-B LJD-C
Test frequency range 10kHz～70MHz 100kHz～160MHz
Main tuning capacitor control Sensor Stepper motor
Capacitance search None Available
The High Frequency Dielectric Constant Tester can measure the Q value of high-frequency inductors or resonant circuits at higher test frequencies, the inductance and distributed capacitance of inductors, the capacitance and loss tangent of capacitors, high-frequency dielectric loss of electrical materials, effective parallel and series resistance of high-frequency circuits, and characteristic impedance of transmission lines. This instrument is widely used in research institutions, schools, factories, and other units.
LJD-B Dielectric Constant Tester and LJD-C Dielectric Constant and Dielectric Loss Tester are newly developed products by Beijing Zhonghang Dingli Instrument Equipment Co., Ltd.
The LJD-B and LJD-C dielectric constant and dielectric loss testers generate signal sources using DDS digital direct synthesis, with frequencies up to
60MHz /160MHz. The signal source has the advantages of low signal distortion, stable frequency and signal amplitude, ensuring measurement accuracy. The LJD-B main capacitor is adjusted by sensor induction, with capacitance reading, and the frequency value can be set. The LJD-C dielectric constant and dielectric loss tester uses
stepper motor control for main capacitor adjustment, with more accurate capacitance reading, and both frequency and capacitance values can be set. The LJD-B/LJD-C capacitance, inductance, Q value, frequency, and range are all digitally displayed. At a certain frequency, as long as the resonance point can be found, the inductance and capacitance values can be read directly, greatly expanding the measurement range of inductance, rather than only measuring inductance values at a few fixed frequencies. The unique resonance point frequency automatic search or capacitance automatic search function of LJD-B/LJD-C helps you quickly find the resonance point of the device under test during use, and automatically read the Q value and other parameters. The Q value range can be switched manually or automatically.
II. Operating Characteristics
1. Q value measurement
a. Q value measurement range: 2～1023;
b. Q value range gears: 30, 100, 300, 1000, automatic or manual switching;
c. Nominal error
LJD-B LJD-C
Frequency range 10kHz～10MHz 100kHz～10MHz
Intrinsic error ≤5％±2% of full scale ≤5％±2% of full scale
Operating error ≤7％±2% of full scale ≤7％±2% of full scale
Frequency range 10MHz～70MHz 10MHz～160MHz
Intrinsic error ≤6％±2% of full scale ≤6％±2% of full scale
Operating error ≤8％±2% of full scale ≤8％±2% of full scale
2. Inductance measurement range
LJD-B LJD-C
14.5nH～8.14H 4.5nH～140mH
3. Capacitance measurement
LJD-B LJD-C
Direct measurement range 1～460p 1～202p
Main capacitor adjustment range 40～500pF 18～220pF
Accuracy Below 150pF ±1pF;
Above 150pF ±1% Below 150pF ±1pF
Above 150pF ±1%
Note: For capacitance measurement beyond the direct measurement range, see the usage instructions.
4. Signal source frequency coverage range
LJD-B LJD-C
Frequency range 10kHz～70MHz 0.1～160MHz
CH1 10～99.9999kHz 0.1～0.999999MHz
CH2 100～999.999kHz 1～9.99999MHz
CH3 1～9.99999MHz 10～99.9999MHz
CH4 10～70MHz 100～160MHz
Frequency indication error 3×10-5±1 digit
5. Q pass indication preset function: preset range: 5～1000
6. Normal working conditions for Q meter
a. Ambient temperature: 0℃～+40℃;
b. Relative humidity lt;80％;
c. Power supply: 220V±22V, 50Hz±2.5Hz.
7. Others
a. Power consumption: about 25W;
b. Net weight: about 7kg;
c. Dimensions (width×height×depth) mm: 380×132×280.
Note: The above information and technical parameters are compiled and released by Yangzhou Darui Electric Co., Ltd.
