TH2851-050 Precision Impedance Analyzer

        TH2851 series impedance analyzer is a new generation of impedance test instrument successfully developed by Changzhou Tonghui Electronics using the current international advanced automatic balancing bridge principle, which is the latest height of domestic impedance test instrument.

        TH2851 series impedance analyzer completely subverted the complex and cumbersome operation interface of traditional domestic instruments, based on Windows 10 operating system, realizing the full computerized operation interface, making the test smarter and simpler.

        TH2851 series impedance analyzer also completely surpassed the 120MHz frequency bottleneck of similar foreign instruments; solved the defects of similar foreign instruments that can only be analyzed and cannot be individually tested; the Chinese and English operation interface also solved the embarrassment of the English interface of the foreign instruments only; adopted the two interfaces of single measurement and analysis, which makes the test simpler.

  The fast 2.5ms test speed and impedance range of up to 40MΩ meets the measurement requirements of components and materials, and is especially beneficial for low loss (D) capacitors and high quality factor (Q) inductors. The four-terminal port configuration effectively eliminates the influence of electromagnetic coupling of the test line and extends the lower limit of low-impedance testing capability downward by a factor of ten compared to conventional five-terminal configurations.

The TH2851 series impedance analyzers include the following types:

1. highly accurate

     The application of broadband automatic zeroing type auto-balancing bridge technology can achieve ideal 10% measurement accuracy in 10Hz-130MHz frequency, 25mΩ-40MΩ impedance range, of which the highest accuracy reaches 0.08%, which is much higher than the accuracy of impedance analyzers and network analyzers of RF reflection measurement method.

1. High stability and consistency

      The following figure shows the curve of measuring 100Ω resistance at speed 5 and test frequency 1MHz, and the trace noise ≦0.003% (≦±0.0015Ω) can be seen from the following figure

1. high speed

10. Large 10.1" screen with four measurement parameters for details at a glance

      10.1-inch touch screen, 1280*800 resolution, Windows 10 system, Chinese and English operation interface, support for keyboard, mouse, LAN, VGA/HDMI interfaces, brings unparalleled ease of operation.

      The large screen brings more benefits is that you can place all the test parameters and sorting parameters, sorting results, function selection and other parameters in the same screen, and it never looks crowded and cluttered, and at the same time, you can display four kinds of measurement parameters, four kinds of measurement parameters can be adjusted arbitrarily. The button on the left side of the screen can quickly select eight sets of test parameters

1. Enhanced list scanning functionality

      A list scan of up to 1601 points can be set, and test conditions such as test frequency, test voltage, DC bias, etc. can be set individually for each point.

1. Powerful graphical interface for analysis

    Up to 4 channels can be displayed simultaneously, and each channel can display up to 4 curves. There are fourteen display methods for each channel and curve.

1. Segmented Scanning Function

       Segment scanning is to set different frequency segments for scanning in one scanning cycle, different levels and offsets can be set during scanning, and the scanning result is directly displayed graphically, which is used for scanning needs that require fast screening of multiple frequency band parameters.

    If a crystal resonator needs to be tested for nominal resonance/anti-resonance frequencies as well as other spurious frequencies, the Segmented Sweep function allows the measurement to be scanned over a specific frequency range without scanning for uncorrelated frequencies.

1. Powerful cursor analysis

TH2851 series precision impedance analyzer has a powerful cursor analysis capability, which can realize the following functions by cursor:

1. Reading the value of the measurement result (as an absolute value or as a relative value with respect to a reference point)
2. Finding a specific point on a curve (cursor find)
3. Analyzing curve measurements and calculating statistics
4. Use cursor values to modify the scanning range and vertical scale.

The TH2851 can display 10 cursors on each curve, including the reference cursor.

Each cursor has an excitation value (the value corresponding to the X-axis of the coordinate system) and a response value (the value corresponding to the Y-axis of the coordinate system).

The Cursor Find function allows searching for the following conditional measurement points:

1. Powerful graphical analysis

1)    Curve sorting function

          All or part of the scanning curve test value can be qualified / unqualified judgment, commonly used in resonance curve screening such as piezoelectric components and other resonance frequency.

2) Equivalent circuit analysis test

     Different types of real-life devices can be equated to simple three-parameter, four-model, four-parameter, three-model impedance devices. The Equivalent Circuit Analysis test provides seven basic circuit models for equating these devices.

         You can compare the impedance fitting curves of the simulated equivalent circuit parameter values with the actual measured impedance curves, and you can also fit them according to the selected model by the parameters you enter.

     Equivalent circuit models can be directly exported to TXT files for users to save and use.

3) Crystal Oscillator Analysis (Piezo Device Analysis)

          Measurement and performance analysis of a crystal oscillator is carried out to obtain important parameters such as resonant frequency, anti-resonant frequency, quality factor, etc. of the crystal after measurement and calculation.

      At the same time, for other piezoelectric devices such as piezoelectric ceramic filters, piezoelectric ceramic traps, piezoelectric ceramic frequency discriminator, piezoelectric ceramic transformer, high-power ultrasonic generator, transducer (oscillator), surface acoustic wave devices, electroacoustic devices and so on can be tested for such as static capacitance, loss, resonance frequency, anti-resonance frequency, mechanical coupling coefficient and other parameters.

4) Comparison of curve trajectories

Curve Trajectory Comparison is used for continuous measurements of the measured part, with all curves displayed in the same coordinate system. By the following two applications:

1. a) For a wide range of different DUTs

       Comparison of curve trajectories under different measurement conditions

       Set different frequency points and calculate the measured values of all curves at that frequency point

1. b) For the same DUT

       Repeatability of multiple measurements compared to measurements taken under the same conditions

       Setting different frequency points and calculating the measured values of all curves at that frequency point

1. Dielectric constant analysis (optional)

      TH2851 series precision impedance analyzer support dielectric material dielectric constant, dielectric loss analysis, need to purchase test fixture and analysis software.

1. configure

2. TH26077 Dielectric Material Test Fixture

     The TH26077 Dielectric Material Test Fixture is designed to make accurate dielectric constant and dielectric loss measurements on the TH2851. Discrete capacitance is eliminated by measuring the dielectric constant of solid materials using the parallel plate method.

1) External structure

2) Basic parameters

3) Test Principle

4) Dielectric constant formula

3. Dielectric Constant Analysis Software

  The software is optional, after opening the TH2851 interface directly select the corresponding parameters can be, respectively, single measurement, list scanning, curve scanning, the following figure is the curve scanning interface.

1. Magnetic permeability analysis

       TH2851 supports magnetic permeability testing of magnetic materials. On the basis of the mainframe, it needs to be equipped with optional test fixture and magnetic permeability analysis software, the specific configurations are as follows:

1. configure

2. Test Fixture

1) TH26086 adapter base

       Used to convert a 4-end pair into an N-type 7mm base, adapted to other test fixtures such as the TH26088 Magnetic Permeability Test Fixture.

       The TH26086 is a mandatory option, if not selected, the TH26088 will not be measured correctly.

       Technical Parameters

2) TH26088 Magnetic Permeability Test Fixture

       The TH26088 accurately measures the permeability of toroidal magnetic materials. Since the fixture is constructed with a toroidal coil wrapped around one turn (no magnetic leakage), there is no need for a wire wrapped around a toroidal coil, and it allows for a wide range of frequency coverage. It comes with one small and one large fixture to accommodate a wide range of sizes, making it an ideal structure for measuring magnetic materials.

       Technical Parameters

3. Test Principle

1) Basic Concept of Magnetic Permeability

2) Effective permeability 

      Measured by the inductance measurement method, the wire is wound on the core of a toroidal core and placed in a closed cylindrical space (TH26088 fixture), the inductance (self-inductance) at both ends of the wire is measured by an impedance analyzer, and the effective permeability is deduced based on the test inductance and the following formula.

3) Relative permeability      

4. Magnetic permeability analysis software (optional)

      After choosing to open the permeability analysis software, the instrument can directly select the permeability parameters in the single measurement, list scan and curve scan, and directly display the test results in the interface.

1. Standard Accessories

1. Optional accessories