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Summary of Contents for Tonghui TH2817
- Page 1 OPERATION MANUAL OF MODEL TH2817 PRECISON LCR METER...
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Page 2: Table Of Contents
Contents 1 Chapter I Generals............2 1.1 Introduction ............... 2 1.2 Technical Specifications ............. 3 1.2.1 Measurement Parameters ........... 3 1.2.2 Measurement Terminals............ 3 1.2.3 Test Frequency ............3 1.2.4 Display Range ............3 1.2.5 Measurement Accuracy ............ 3 1.2.6 Measurement Level ............4 1.2.7 Measurement Speed ............ - Page 3 2.4.2 Equivalent Model ............22 2.4.3 D,Q Displayed in PPM Mode ..........24 2.4.4 Volume and State of Alarm ..........25 2.4.5 Automatic Selection of Parameters L, C and Z ......... 25 2.4.6 Correction.............. 25 2.5 Sorting Function ............27 2.5.1 Introduction of Sorting ............
- Page 4 DANGER The highest external DC bias voltage is 100V. When external dc bias voltage is applied, the high voltage exists between the test terminals of the meter. Special care should be taken when carrying out test to avoided injury of human body caused by electrical shock. When making test with external bias voltage applied, please do not contact directly or plug in/draw out the component under test on the test fixture or test cable because leads of the tested component are of high voltage.
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Page 5: Chapter I Generals
Chapter I Generals Introduction TH2817 is an high precision impedance test instrument with wide test range. The instrument provides six typical test frequencies of 100 Hz, 120 Hz, 1 kHz, 10 kHz, 40 kHz and 100 kHz and three test levels of 0.1V, 0.3V and 1.0V for convenient choice, and can measure various parameters such as inductance L, capacitance C and resistance R. -
Page 6: Technical Specifications
by a printer with a standard interface; · Serial interface – RS-232C provides great convenience for communications between the instrument and computers. All functions and parameters of the meter can be set through the interface by which functions of the keyboard can almost be replaced;... -
Page 7: Measurement Level
R: 0.05% (1+R ) (1+Q ) (1+k D: ±0.0003 (1+Z ) (1+D ) (1+k )+0.0002; Q: ±0.0005 (1+Z ) (Q +1/Q ) (1+k Notes: 1. D and Q are absolute deviations and others are percent deviations; 2. Those with subscript mean measurement values of the parameters, those with subscript mean maximum values and... -
Page 8: Measurement Speed
Level accuracy: ±(8%×set value) (1+k•f) Note: The set value of the measurement level is the value set when test terminals are opened (HD and HS should be connected). Here f is measurement frequency with the unit of kHz; When Range = 0, k = 0.25; When Range = 1, k = 0.025;... -
Page 9: Equivalent Circuit
Equivalent Circuit 1.3.3 The measurement value of the device under test can be outputted in both series and parallel equivalent circuit models. Measurement Mode 1.3.4 Continuous: the instrument continuously repeats measurements and displays the values after each measurement; Single: usually the instrument is in the wait for trigger state, the instrument performs a single measurement every time a “Start”... -
Page 10: Handler Interface
The instrument can be operated by a computer through the serial interface instead of the keyboard in the front panel, at the same time the instrument can send out the measurement values to other equipments. Handler Interface 1.3.10 When sorting function is selected, Handler interface is set to “ON” state and the instrument works in Single trigger mode, the instrument will output the bin sorting results, the signal of busy with A/D conversion and calculation, and the signal of End of A/D conversion. - Page 11 HD and HS should be connected to one lead of the device under test and LD and LS should be connected to another lead. Trade Mark & Model TONGHUI, TH2817 Precision LCR Meter Functions and measurement conditions of the instrument can be Keyboard selected and controlled by the 6-button keyboard.
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Page 13: Description Of The Rear Panel
Description of the Rear Panel 1.4.2 Description of the rear panel: Name Description of Function Provide serial interface between the instrument and peripheral RS-232 Serial equipments. Parameters, instructions and measurement results Interface (9-Pin) can be sent and received through the interface. By using the Handler Interface, the instrument can easily be Handler Interface combined with a component handler, and a system controller to... -
Page 15: Chapter Ⅱ Operation Instruction
Figure 2-1 Keyboard of TH2817 Figure 2-2 Measurement States of TH2817 TH2817 has only six keys shown as Figure 2-1. These keys are used to select controls and set parameters. The keys have different functions in different conditions. There are three main menus. - Page 16 when the instrument is in the first menu. In this menu you can set the test frequency, averaging rate, equivalent circuit, and so on. Third Menu: The instrument enters the third menu by pressing the SET key once again when the instrument is in the second menu. You should press the SET key twice if the instrument is in the first menu.
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Page 17: Conversion Of Menus
E. High Limit of Bin 3 (P3¯--); F. Low Limit of Bin 3 (P3_--); G. High Limit of D (D¯--); H. Low Limit of Q (Q_--); Nominal (STD--). Conversion of Menus Previous paragraph described the menus and the functions of each menu. The conversions from one menu to another menu are described as follows: The instrument is in the First Menu when it is switched on. -
Page 18: Measurement Parameter
ON, which means the state is selected. Measurement Parameter 2.3.1 Parameters to be measured by TH2817 are as follows: L/Q: Inductance L and Quality factor Q C/D: Capacitance C and Dissipation factor D R/Q: Resistance R and Quality factor Q... -
Page 19: Display Mode
Equation (2-3) shows that D and Q have the same sign with that of Rs and Rp, and have no relation with the sign of Xs or Xp. Display Mode 2.3.2 TH2817 provides four kinds of display modes: DIR, △, △% and V/I. DIR Mode 2.3.2.1 In DIR mode, the measurement values of the device under test can be read directly from the instrument. - Page 20 Deviation Measurement 2.3.2.2 TH2817 provides two types of deviation measurements. They are absolute deviation measurement and percent deviation measurement. Measurement speed will be reduced because more time will be used to calculate the deviation. Nominal Value Nominal must be set before deviation measurement, because the absolute deviation is the difference between the measured value of the component and a previously stored nominal value.
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Page 21: Measurement Level
2.3.2.3. Measurement Speed 2.3.4 TH2817 provides three measurement speeds: fast, medium and slow. Measurement Time 2.3.4.1 The measurement time consists of two main parts: integration time and calculation time. -
Page 22: Measurement Range
We can use the averaging function to acquire the more stable and accurate measurement value, but the measurement speed will be decreased. The averaging rate of TH2817 can be programmed from 1 to 99. The default value is 1, when the instrument is switched on. -
Page 23: Cont And Single Mode
If the impedance of the device under test is out of the effective measuring range of the held range, TH2817’s measurement accuracy does not meet its specification. So make sure that the optimum range is selected when using the range hold function. -
Page 24: Functions In The Second Menu
Functions in the Second Menu All functions in the second menu are shown as follows in Table 2-4. Functions States Name Display B Name Display A 100 Hz 0.1000 120 Hz 0.1201 Measurement 1 kHz 1.0000 F R E - - Frequency 10 kHz 10.000... -
Page 25: Set The Test Frequency
The resistor and reactor in both series and parallel models can be measured by TH2817. The values in the two different equivalent circuits can be converted to each other mathematically. The values are different due to the quality factor Q (or the dissipation factor D). - Page 26 Circuits Relations π π π π Table 2-5 Relations between the series and the parallel circuits Where: L: Inductor C: Capacitor f: Frequency R: Resistor D: Dissipation Factor Q: Quality Factor Subscript s means series model and subscript p means parallel model. D = 1/Q Xs = 1/(2 π...
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Page 27: D,Q Displayed In Ppm Mode
Figure 2-5 The Equivalent Circuit of An Actual Capacitor Where, Cx: ideal capacitor Rx: resistance of the leads Lo: inductance of the leads Rp: insulation resistance across the capacitor Co: stray capacitor across the capacitor. The following description gives some practical guide lines for selecting the equivalent circuits. -
Page 28: Volume And State Of Alarm
OPEN correction and SHORT correction are provided by TH2817. When TH2817 performs OPEN/SHORT correction, all the frequency points are corrected. When test speed or test level is changed, another OPEN/SHORT correction should be performed. - Page 29 No. Operations Display A Display B Descriptions Current FRE-- Enter the second menu frequency OPEN CLEAR Open the test terminals ＜ START 0.10000 OPE-0 Open correction for 100 Hz, range 0 0.1201 OPE-0 Open correction for 120 Hz, range 0 1.0000 OPE-0 Open correction for 1 kHz, range 0...
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Page 30: Sorting Function
Introduction of Sorting 2.5.1 TH2817 can sort the devices under test into four Bins: P1, P2, P3 and NG. NG means no good. NG is effective when either the main parameter or the sub parameter is not within their limits. P1 to P3 are effective when the sub parameter is within the limit of sub parameter and the main parameter is within the limits of P1 to P3. - Page 31 Note: X is the measurement value of main parameter. Figure 2-6 Flow Chart of Sorting There are two methods for specifying primary parameter limits. In both methods the high limit must be greater than the low limit for a certain pairs of limits. Tolerance Mode: The tolerance mode specifies bin limits by the deviation from the specified nominal value.
- Page 32 Figure 2-7 Tolerance Mode Sequential Mode : The sequential mode specifies bin limits as the actual measurement value. The limits must be set in order from the smallest value to the largest value. There can be openings and duplications between the bin limits. (Refer to Figure 2-8.) Figure 2-8 Sequential Mode The nominal value is set according to the selection of measurement parameters.
- Page 33 The states of the four kinds of flashing items are given as follows: A. The symbols of bin limits and nominal: Symbol Description Down High limit of bin P1 Low limit of bin P1 High limit of bin P2 Low limit of bin P2 High limit of bin P3 Low limit of bin P3 High limit of D...
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Page 34: Example Of Sorting
A or B. Handler Interface By using the handler interface, TH2817 can easily be combined with a component handler, and a system controller to fully automate component testing, sorting, and quality control data processing. External “START” signal is received for triggering the instrument to start measurement, while WAIT and EOC signals are output. -
Page 35: Operation
measurement, but the component handler must keep still before EOC is effective. Sorting result of each bin is outputted by an open-collector gate. Handler interface locates on the rear panel of the instrument. Operation 2.6.1 The Handler interface works only when the following three conditions are met: 1. -
Page 36: Connector Of Handler Interface
Table 2-8 HANDLER Interface Pin Assignments Standard Printer Interface TH2817 provides a standard parallel printer interface which can be connected to any printer which has the standard printer interface. Function setup, comparison limits, measurement value, and comparison results can be printed. -
Page 37: Print Format
Printer interface connector pin assignments are as follows: Figure 2-11 Pin Assignments of Printer Interface Pin assignments for printer interface: Pin No. Name Direction Function The signal tells the printer that data on the bus is effective and Output STROBE ready to be read. -
Page 38: Serial Interface(Rs-232C)
1. Measurement parameter (PARAM.); 2. Measurement frequency (FREQU.); 3. Measurement level (LEVEL); 4. Measurement speed (SPEED); 5. Averaging rate (AVERA.); 6. Equivalent circuit (EQUIV.); 7. Range mode (RANGE); 8. Measurement mode (MODE); 9. Display mode (DISP.); 10. D,Q in PPM display mode (DQ-PPM); 11. - Page 39 Accurately the ON/OFF state of serial interface determines whether the instrument can send out measurement results. TH2817’s serial interface meets the RS-232 standard. The serial interface adopts asynchronous serial communication bus with fixed baud rate of 9600 bps, the logic level is ±...
- Page 40 Test speed S, M, F S: slow M: medium F: fast Range mode A, H A: auto H: hold (manual) Measurement mode C, S C: continuous S: single Y: measurement value without correction No-correction Y, N N: measurement value with correction Y: printer interface ON Printer interface Y, N...
- Page 41 Table 2-10: Format of Output Information Commands for serial interface are shown as in Table 2-11(computer TH2817) In the following table, each command can only be sent alone, and you are not allowed to send more than two commands at a time. Each command starts with 02H and 0DH and ends with 3FH.
- Page 42 Measurement frequency: 100kHz Equivalent circuit: series Equivalent circuit: is parallel PPM mode: ON PPM mode: OFF Volume: off Volume: low Volume: high Alarm bin: NG Alarm bin: P1 Alarm bin: P2 Alarm bin: P3 Auto LCR: ON Auto LCR: OFF No-correction: ON No-correction: OFF Serial interface: ON...
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Page 43: Save The Parameters
U is 20H Table 2-11 Commands of Serial Interface Save the Parameters Th2817 has a non-volatile memory which saves the parameters without power supply. Here are the parameters saved: 1. Open and Short correction data;... -
Page 44: Chapterⅲ Measurement Basics And Troubleshooting
Measurement Basics 3.1.2 1. Turn on the instrument with proper power supply, “ TONGHUI TH2817” will be displayed and shifted in the windows of Display A and B, then the instrument performs the power-on self tests and corresponding information is displayed at the same time, the sequence number is from 99999 to 11111. - Page 45 2. The states of instrument will be initialized after self tests as follows: A. The First Menu (or “measurement” state) Parameter Display Direct Level 1.0V Speed Slow Range Auto Mode Continuous B: The Second Menu Frequency 1kHz Averaging Rate Equivalent circuit Series D,Q PPM Mode Sorting...
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Page 46: Measurement Of Inductor And Transformer
– (D – D Where is the actual value of the device under test; is the measurement value of the device under test; is the measurement value of the reference device; is the actual value of the reference device; Measurement of Inductor and Transformer Measurement of Inductor 3.2.1 The real inductor consists of a winding and a magnetic core, and its characteristics differ... - Page 47 Figure 3-4 Adjustment of output impedance TH2817 provides three kinds of test level: 0.1V, 0.3V and 1.0V, and the output impedance is about 15 Ω for measurement range 0~40 Ω . Adopt the above method shown in Figure 3-4, user can adjust the output impedance to acquire the same current level.
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Page 48: Measurement Of Transformer
Measurement of Transformer 3.2.2 TH2817 is not specially designed for transformer measurement; however some main parameters of transformer can be measured using the following methods. Transformer can be looked as a kind of special inductor, and following figure describes the equivalent circuit of transformer. - Page 49 The Primary and Secondary Inductors can be measured as shown in Figure 3-6. Primary inductance (L1) and secondary inductance (L2) can be directly measured. Other windings should be in open state, when one of the inductors is measured, the measured value is affected by capacitor C.
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Page 50: Connection Of Component
Connect the Component 3.3.2 TH2817 has four test terminals and the outer shields of each terminal are connected with the instrument ground, the outer shield can be looked as the fifth terminal. Descriptions of the five terminals are as follows: HD: high drive terminal of current;... -
Page 51: Eliminate The Influence Of Stray Impedance
LS: low sense terminal of voltage; ┴ : Ground. The ground shields are used reduce influence of stray capacitance and electromagnetic disturbance. HD, HS and LD, LS should be connected at the lead of the component under test in order to reduce the influence of cable resistance and contact resistance especially in D measurement. -
Page 52: Dc Bias
Here we introduce the way to measure the component with external DC bias. Measurement with DC Bias Voltage TH2817 can be applied with an external DC bias voltage of 100V in maximum. DC bias voltage can be applied according to the circuit described in Figure 3-13. Perform open and short corrections when DC bias voltage is 0V to eliminate the influence of the external circuit, then you can measure the component with the DC bias voltage. - Page 53 Measurement with DC Bias Current Figure 3-14 Circuit for External DC Bias Current When TH2817 is applied with external DC bias current, you can adopt TH1771 (0-6A), TH1772 (0-2A) DC bias current sources (DC Bias Current Source) produced by our company.
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Page 54: Troubleshooting
4. The high frequency pulses on the pins 29 and 30 of CPU; 5. The display unit. Normally, “ TONGHUI TH2817” is displayed and shifted in the windows of Display A and Display B, then self-tests are performed. Self-tests are stopped when an error occurs. - Page 55 company for maintenance. 5. Check the measurement frequency: 55555 F-0.10 55555 F-1.00 55555 F-10.0 Three frequencies of 100Hz, 1kHz and 10kHz are checked. D111 (8253) is used to check the frequencies. If frequency can’t be generated, then following information will be displayed: 55555 If 8253 can’t generate UNK signal, then following information will be displayed: 55555...
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Page 56: Chapter Ⅳ Packing And Warranty
Chapter Ⅳ Packing and Warranty Packing The contents are listed as follows: Description Quantity 1) Model TH2817 Precision LCR Meter 2) Th26011 Kelvin Test Cables 3) Th26005 Test Fixture 4) Three-Wire Power Cable 5) 1A Fuse 6) Operation Manual 7) Certificate of Quality...
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Questions and answers
オープンチェック、 ショ－トチェック の方法を教えてください。
To perform OPEN and SHORT checks for the Tonghui TH2817:
1. OPEN Check:
- Ensure the test terminals are open (not connected to any component).
- The instrument will display "OPEN" in Display A when Z > 50MΩ.
- Perform OPEN correction to correct stray admittance.
2. SHORT Check:
- Short the test terminals (connect them together).
- The instrument will display "SHORT" in Display A when Z < 80mΩ.
- Perform SHORT correction to correct residual impedance.
Both corrections should be performed for all frequency points, and they should be repeated if the test speed or test level is changed.
This answer is automatically generated