Tonghui Electronics TH2820 Manuale utente

OPERATION

MANUAL

iio

Caution

Keeping on turning on and off the instrument is absolutely

forbidden, as this will cause the disorder of the program, which will

lead to the loss of the calibrated data and the data saved by users.

Note

“7.Advanced set” in the setup menu should only be operated by

the qualified calibration personnel, therefore, this function is password

protected. Even if you know the password, you should also take high

cautions when choosing to use the options. Any wrong operations may

lead to the incorrect test results!

This instrument should be calibrated in the calibration lab in our

company.

Options and functions of the instrument may be advanced by our company in order to

make the instrument more accurate. Any queries regarding the instrument, please feel free to

Content

.Content

Caution......................................................................................................2

Note.................................................................................................................2

Chapter 1 Summary...............................................................................................................4

1 Introduction .......................................................................................................4

2 Main features .....................................................................................................4

3 Specifications .....................................................................................................5

4 Environment.......................................................................................................6

Chapter 2 Panel Overview.....................................................................................................7

1 Front Panel ........................................................................................................7

2 Rear Panel .........................................................................................................8

Chapter 3 Operation Illustration................................................................................................9

1 Turning On ..........................................................................................................9

2 Operation ..........................................................................................................10

Chapter 4 Maintenance and Measurement Basic...................................................................21

1 Input Protection ...............................................................................................21

2 Measurement Contacts......................................................................................21

3 StrayCapacitance............................................................................................22

Chapter 5 Contents and Warranty..........................................................................................24

1 Contents............................................................................................................24

2 Warranty..........................................................................................................24

Chapter 2 Panel Overview

Chapter 1 Summary

Thanks for purchasing our products! Please check the contents according to the last

chapter “Contents and Warranty” of the manual before put the instrument in use.

1 Introduction

Model TH2820 LCR meter is a micro desktop instrument by using microprocessor

technology. It can measure 6 basic parameters, they are inductance L, capacitance C,

resistance R, impedance Z, dissipation factor D and quality factor Q, which can fulfill the

measurement needs of various components manufacturers and maintenance technicians.

2 Mainfeatures

1．Zero Correction:

OPEN —— sweep correction of open circuit;

SHORT —— sweep correction of short circuit.

2．Display Format:

·Direct —— actual measured value；

·∆—— absolute delta between the measured value and the reference value;

·∆% —— delta percent between the measured value and the reference value.

3．Range Hold:

When measuring a large number of components with the same nominal value, this

function can effectively improve the measuring speed.

4．Comparator Function:

TH2820's built-in comparator can sort components into a maximum of four bins (NG, P1,

P2 and P3).

5．Equivalent Measurement Circuit:

There are two equivalent circuit models: parallel and series.

TH2820 LCR METER

3 Specifications

Parameters L-Q, C-D, R-Q, Z-Q and Z-D

Test Frequency 100Hz, 120Hz and 1kHz

Display Digits 5 digits for both primary parameters and secondary parameters

100 Hz, 120 Hz 1 µH – 9.9999 kH

L 1 kHz 0.1 µH – 999.99 H

100 Hz, 120 Hz 1 pF – 9.9999 mF

C 1 kHz 0.1 pF – 999.99 µF

R, |Z| 1 mΩ– 999.99 MΩ

D, Q 0.0001 – 99999

Measurement

Range

∆% 0.0001% – 99999%

Accuracy (Test

Condition: within

basic

measurement

range,23°C±5°C，

<75%R.H.)

C：0.3% (1+ Cx/Cmax+ Cmin/Cx)(1+Dx)；

L：0.3% (1+ Lx/Lmax+ Lmin/Lx)(1+1/Qx)；

Z：0.3% (1+ Zx/Zmax+ Zmin/Zx)；

R：0.3%(1+ Rx/Rmax+ Rmin/Rx)(1+Qx)；

D：±0.001(1+Zx/Zmax+ Zmin/Zx)(1+Dx+Dx2)+0.0002；

Q：±0.002(1+ Zx/Zmax+ Zmin/Zx)(Qx+1/Qx)；

Test signal level 0.3Vrms(1±10%)

Ranging Mode Auto, Hold

Equivalent model Series, Parallel

Display Direct: actual measured value;

∆: absolute delta;

∆% : delta percent.

Correction Open and Short correction

Test Speed approx.3times/second

Test Terminals 5 terminals

% -9999% – +9999%

L 0.0001 µH – 99999 kH

C 0.0001 pF – 99999 mF

R 0.0001 mΩ– 99999 MΩ

Range of Sorting

Limits Nominal

value Z 0.0001 mΩ– 99999 MΩ

Sorting Bins NG, P1, P2 and P3

Alarm States NG, P1, P2, P3 and OFF

Weight Around 1.5 kg

Consumption Max.10 W

Power 220VAC（1±10%）, 50Hz（1±5%）

Chapter 2 Panel Overview

Note:

1. Accuracy of D and Q are delta absolute deviations, the rest are delta percent deviations;

2. Suffix withX is the actual measured value of this parameter, suffix with max is the maximum

value, suffix with min is the minimum value;

Range Hold

Parameter Range

Auto Range0 Range1 Range2 Range3 Range4

Cmax 80µF/f 1000pF/f 0.1µF/f 1µF/f 10µF/f 80µF/f

Cmin 150pF/f 150pF/f 1900pF/f 10nF/f 100nF/f 1µF/f

Lmax 159H/f 159H/f 25.3H/f 2.53H/f 253mH/f 25.3mH/f

Lmin 0.32mH/f 2.53H/f 0.25H/f 25.3mH/f 2.53mH/f 0.32mH/f

Zmax 1MΩ1MΩ159kΩ15.9 kΩ1.59kΩ159Ω

Zmin 1.59Ω15.9kΩ1.59kΩ159Ω15.9Ω1.59Ω

max = Rmax; Zmin = Rmin

3. In order to maintain good test accuracy, proper open and short circuit corrections should

be taken under current measurement condition and measurement fixture.

4 Environment

1．Please do not operate the instrument under the following environment conditions, as

any of them will directly affect measuring precision or damage the instrument:

(1) Please do not operate the instrument in the places where is vibrative, dusty,

under direct sunlight, or where there is corrosive air.

(2) Although the equipment has been specially designed for reducing the noise

caused by AC power, a place with low noise is still recommended. If this cannot

be arranged, please make sure to use power filter for the instrument.

2．Please store the instrument in the place where temperature is between -25°C and

50°C. If the instrument will not be put in use for a while, please have it properly packed

for storing.

3．Operation environment for securing measuring precision requirement:

Temperature: 0°C ~ 40°C

Humidity：≤85%R.H.

4．Pre-heat the instrument about 10 minutes before starting measuring.

TH2820 LCR METER

Chapter 2 Panel Overview

1 Front Panel

UNKNOWN

SORTING

SETUP

START

FREQ

NG P1 P2 P3

PARA DISP RANGE

HD HS LS LD

POWER

OFF

BUZZER

TH2820 LCR METER

TONGHUI

ELECTRONICS

1234 5 6

789

Figure 2-1 Front panel

Following is the description of items 1~9 in Figure 2-1.

No Name Description

1 Parameter

Displaying current measured parameters：

L-Q, C-D, R-Q, Z-Q, Z-D or AUTO

2 Frequency

Displaying current frequency：100 Hz, 120 Hz or1 kHz

3 Display Mode

Displaying current display mode of the primary

parameter: DIR, ∆or ∆%

4 Range Displaying range state: Auto, Hold or current range.

5 Bins Indication

NG: No-good; P1: Pass1; P2: Pass2; P3: Pass3;

P1, P2, P3 Priority is lower in turn.

6 Buzzer

7 Test Terminals HD, HS, LS and LD

Cursor keys Function table moving and rolling

Setup key Entering function table setting

8 Key Start key The executing confirmation of command

9 POWER Power switch

Table 2-1 Front Panel Descriptions

Chapter 2 Panel Overview

2 Rear Panel

INPUT

AC 220V

50Hz

FUSE

123

Figure 2-2 Rear panel

Item Name Description

1 Plate Production date, model and serial number

2 Fuse Holder 1A 250 Vac slow blow fuse.

3 Power Receptacle 220 Vac 50 Hz

Table 2-2 Rear Panel Descriptions

Chapter 3 Operation Illustration

This chapter will introduce how to operate this instrument in details, please read it carefully

before operating, in order to avoid any damages to the instrument or dangers to the safety.

1 Turning On

a．Display company name and version，the indicator lamps of P1、P2、P3、NG flash in turn.

TH2820 LCD LCR METER

Ver1.0

Figure 3-1 Turning on information

b. Starting power-on self tests

1）EEPROM Memory checking

2）ADC AD converter checking

c. Entering measuring state after self tests

Cs:0.0030pF D:1.0000

C-D 100Hz Dir AUTO

Figure 3-2 Measuring state

The factory settings are listed as follows and can be reseted according to the

operation description in next paragraph.

（1） Parameter: C-D;

（2） Frequency: 100 Hz;

（3） Display: Dir（direct reading）;

（4） Range: AUTO（automation）;

（5） Equivalent: SER（serial）;

（6） Alarm Bin: P1（Pass #1）;

（7） LCZ automation: OFF;

（8） Cursor：

TH2820 LCR METER

2 Operation

1 Direct function setup —— Parameter, frequency, display and range:

a) Press keys to move the cursor and select one of the four direct functions.

b) Press keys to select：

Cs:0.0030pF D:1.0000

C-D 100Hz Dir AUTO

Para Freq Disp Rang

L-Q 100Hz Dir AUTO

C-D 120Hz ∆HOLD

R-Q 1kHz ∆%

Z-Q





Z-D







Table 3-1 OSD Direct Function Items

A．Parameter:

Unit descriptions:

L µH mH H kH

C pF nF µF mF

R/Z MΩΩkΩMΩ

Table 3-2 units

1．Z is the absolute value of impedance. Measurement value of L, C or R may be

positive or negative. Negative capacitance value means that the device under test

is actually an inductor; also negative inductance value means that the device

under test is actually a capacitor. In theory R should be positive constantly, under

some condition, R maybe negative due to over zero correction. Please carry out

correct zero correction.

2．The maximum number of display digits is 5, but 5 digits is not always available and

4 digits is displayed sometimes. The conversion is described in the following table:

Indice

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