TH2821A

Portable LCR Meter

OPERATION MANUAL

English

1 st

November 2005

Edition Rev 1.0.0

© Copyright 2005 Changzhou Tonghui Electronic Co., Ltd.

All rights reserved.

Contents

TH2821A OPERATION MANUAL

Contents............................................................2

How to Contact Us .......................................3

Incoming Inspection .....................................4

Notes on Use ...............................................5

Warranty:....................................................6

Chapter 1 Overview............................................7

1.1 Introduction...........................................7

1.2 Main Functions.......................................7

1.3 Specifications ........................................9

1.4 Environment Requirements ...................12

Chapter 2 Panel Illustration..............................13

2.1 LCD Display Illustration.........................13

2.2 Keyboard Illustration ............................15

Chapter 3 Operation.........................................17

3.1 Power on .............................................17

3.2 How to operate....................................18

3.2.1 First Key Functions .....................18

3.2.2 Second Key Functions: ................20

3.3 Battery recharge..................................30

3.4 Clearing Instruction..............................31

Appendix .........................................................32

2

TH2821A OPERATION MANUAL

How to Contact Us

Changzhou Tonghui Electronic Co., Ltd.

Address: No. 3, Tianshan Road, New District,

Changzhou, Jiangsu, China

Tel: 0086-519-5132222, 5113342, 5109592

Fax: 0086-519-5109972 http:// www.tonghui.com.cn

http:// www.tonghui.cn

Email: [email protected]

3

TH2821A OPERATION MANUAL

Incoming Inspection

Inspect the shipping container for damage. The contents of the shipment should be listed as follows. If the contents are incomplete, if there is damage or defect, please contact our company or your nearest Sales and Service Office.

Accessories

TH26028 DC Power Adapter

TH26027 4 terminal Kelvin test clip leads

1

1

LH-200H7C rechargeable battery (inside) 1

Manual 1 User

Options

TH26029 SMD component test fixture

4

Notes on Use

TH2821A OPERATION MANUAL z This meter is only for indoor use. z Turn off the TH2821A while switching the power supply between battery and DC adapter or replacing the battery. z Although internal circuit protection is provided, DC voltage or current may damage TH2821A. Before you measure a capacitor, be sure the capacitor is fully discharged. z Charging may disturb measurement result sometimes. z Nickel Metal Hydride rechargeable battery can be used for the power supply. TH2821A will not work normally when battery voltage is less than 6V. z The 12V AC to DC adaptor is recommended to be used for TH2821A power supply. z Perform Open and Short corrections for accurate measurement especially when test fixture is changed. z The functions locked with password are not accessible by users.

5

Warranty:

TH2821A OPERATION MANUAL

This instrument product is warranted against defects in material and workmanship for a period of two years from the date of shipment. During the warranty period, Our company will, at its option, either repair or replace products which prove to be defective. For warranty service or repair, this product must be returned to a service facility designated by our company.

Warranty limitation

The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by Buyer,

Buyer-supplied software or interfacing, unauthorized modification or misuse, or improper site preparation or maintenance.

6

Chapter 1 Overview

Thank you for purchasing our product. To get the maximum performance from the instrument, please read this manual first, and keep this manual at hand.

1.1 Introduction

TH2821A is a microprocessor-controlled portable meter with low power consumption. It can measure six basic parameters, they are inductance L, capacitance C, resistance R, impedance |Z|, dissipation factor D and quality factor Q.

TH2821A can fulfill the measurement needs of various component manufacturers and maintenance technicians.

1.2 Main Functions

1． Test Parameter

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

2． Correction

OPEN: multi-frequency correction of open circuit;

SHORT: multi-frequency correction of short circuit.

3． Display Mode

Direct —— direct measurement value;

∆

∆%

—— absolute deviation;

—— percent deviation.

4． Range Hold

When measuring a large number of components with the same nominal value, this function can effectively improve the measuring rate.

TH2821A OPERATION MANUAL

5． Comparator Function

Built-in 4 Bins comparator: NG, P1, P2 and P3.

6． Equivalent Circuit Mode

Both parallel and series equivalent circuit modes can be obtained.

7． Data Hold

This function can be used to freeze the current display value.

8． Alarm Mode

NG, P1, P2, P3 and OFF modes can be selected.

8

TH2821A OPERATION MANUAL

1.3 Specifications

Parameter

Frequency

Accuracy

Display

Measurement

Range

Test Level

(Range Auto and Open

Circuit)

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

100 Hz, 120 Hz , 1 kHz and 10 kHz

Basic Accuracy: 0.3%

5 digits display for both primary and secondary parameters

100 Hz,120 Hz 1 µH – 9999 H

L

1 kHz,10 kHz 0.1 µH – 999.9 H

C

100 Hz, 120Hz

1kHz,10 kHz

1 pF – 9999 µF

0.1 pF – 999.9 µF

R, |Z| 0.0001 Ω - 999.9 MΩ

D, Q

∆%

0.0001 – 9999

0.0001% - 9999%

10kHz 0.1 Vrms (1±15%)

120Hz

1kHz

0.3 Vrms (1±15%)

100Hz 0.42 Vrms (1±15%)

Ranging Mode Auto and Hold

Equivalent

Circuit

Parallel and Series

Display

Correction

Rate

Terminals

Direct, ∆ABS and ∆%

Open and Short Zeroing

Approx. 3 meas/sec

5 terminals

9

TH2821A OPERATION MANUAL

(Continued)

Comparator 4 Bins：NG, P1, P2 and P3

∆% -9999% - 99999%

Limit Setup

Range

L

C

R

Z

0.0001 µH – 99999 H

0.0001 pF – 99999 µF

0.0001 Ω - 99999 MΩ

0.0001 Ω - 99999 MΩ

Alarm Mode NG, P1, P2, P3 and OFF

Power Supply

9V rechargeable battery or DC12V(100 mA) adapter

Low Battery

Indication

Approx. 6V

Power

Consumption

Normal: Approx. 25 mA

Auto power-off: Approx. 500 nA

Auto Power

Off time

Approx. 5 minutes

Weight Approx. 400 g

Dimensions 200mm(L) × 95mm(W) × 40mm(D)

Table 1-1 Specifications

10

TH2821A OPERATION MANUAL

*

Note：

Primary parameter accuracy(A e

C： A e

= 0.3%(1+C x

L： A e

= 0.3% (1+ L

/C max x

/L

)

+C max min

/C

+ L min x

)

/L x

)

Z： A e

= 0.3% (1+ Z x

R： A e

/Z max

+ Z min

/Z x

)

= 0.3%(1+ R x

/R max

+ R min

/R x

)

Max and Min values are as follows：

Parameter Range

C max

Auto

80µF/f

C min

150pF/f max

L max

159H/f

L min

0.32mH/f

Z max

Z min

= R max

; Z min

= R min

1MΩ

1.59Ω

, Frequency unit: kHz. Here：Z

Secondary parameter accuracy

D

D e e

= A

= A e e

/3

(1+D x when D x

)/3 when D x

≤0.1

＞0.1

Q e

= ±

1

Q x

µ

Q

× x

D

× e

D e

when Q x

·D e

<1

11

TH2821A OPERATION MANUAL

1.4 Environment Requirements

1 ． Please do not operate TH2821A under the following environment conditions, as any of them will directly affect measuring precision or damage the meter: z

Please do not operate the instrument in places where is dusty, vibrant, under direct sunlight, or where there is corrosive air. z Although TH2821A has been specially designed for reducing the noise caused by AC power, the environment with low noise is still recommended.

If this can not be arranged, please make sure to use power filter for the AC-DC adaptor.

2． The TH2821A must be operated under the following environment conditions:

Temperature: 0°C ~ 40°C,

Humidity: ≤ 90% RH at 40°C.

3． Storage Temperature: -25°C ~ 50°C.

12

TH2821A OPERATION MANUAL

Chapter 2 Panel Illustration

2.1 LCD Display Illustration

Figure 2-1 LCD Display

13

TH2821A OPERATION MANUAL

No. Description No.

1

Battery Power

2

3

Indicator

Remote

Indicator

Beeper

9

Description

Ranging Mode Indicator

4

5

6

7

Indicator

Series/Parallel

Indicator

Comparator

Indicator

Secondary

Parameter

Indicator

Secondary

Parameter

Display

13 2 nd Function Indicator

Table 2-1 LCD Description

Others:

DH: Data hold indictor

CAL: Correction function indictor

MENU: Menu operation indictor

14

TH2821A OPERATION MANUAL

2.2 Keyboard Illustration

POWER

①

CLEAR

PARA

ESC

②

LIMIT

U ③

SHIFT

⑧

EQU

DH

⑦

▲

BUZZER

⑥

V

MENU

FREQ

④

ENTER

DISPLAY

AUTO

⑤

Figure 2-2 Keyboard

Â

Convention：

Key Function Conventions

1 st

2 nd

function: PARA

function: CLEAR

3 rd function:

}

15

No. Key

TH2821A OPERATION MANUAL

Function

SHIFT+

Key

○

○

○

○

PARA

U

FREQ

AUTO

On/Off

Parameter

Selection

Range Up

Frequency

Selection

Range Auto

Selection

CLEAR

LIMIT

MENU

Function

Correction key

Sorting Limit

Setup

Auxiliary

Menu

V

DH

Range Down BUZZER Alarm Mode

Data Hold EQU

Equivalent

Circuit

○ SHIFT 2 nd Function

The 3 rd

Table 2-2 Key Description

Functions：

}

, o , q , p , r and x

are valid during Menu setup and Data input operations.

16

TH2821A OPERATION MANUAL

Chapter 3 Operation

3.1 Power on

1. Press POWER key to turn on TH2821A.

2. The operation system version will be displayed.

3. At last the instrument enters the measurement state.

6. Parameter D

8. Unit

Figure 4-1 Measurement Display

Measurement display description:

1. Battery Supply

4. Series Circuit

3. Beeper ON

5. Sorting Result: P1

7. Secondary parameter

9. Range 0 (Auto)

10. Primary parameter 11. Frequency: 1 kHz

12. Parameter C

17

TH2821A OPERATION MANUAL

3.2 How to operate

3.2.1 First Key Functions

1. Parameter Setup：

Press PARA key to select the following measurement parameter combinations：L-Q, C-D, R-Q and Z-Q.

Units Description:

L µH mH H

C pF nF µF

R/|Z| Ω kΩ

Table 4-1 Units

MΩ

|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 may be negative due to over zero correction. Please carry out correct zero correction.

The maximum number of display digits is 5, but 5-digit is not always available and 4-digit is displayed sometimes.

The conversion is described in the following description:

From 4-digit to 5-digit:

When the first 2 digit of current value is less than 18.

From 5-digit to 4-digit:

When the first 2 digit of current value is more than 20.

2. Frequency Setup:

Use FREQ key to select the following test frequencies in turn: 100 Hz, 120 Hz ，1 kHz and 10 kHz.

18

TH2821A OPERATION MANUAL

3. Range Setup:

U, V and AUTO keys are used to set the measurement range. AUTO key toggles ranging mode between “Auto” and “Hold”. U and V keys are used to increase or decrease the measurement range, if the current ranging mode is “Auto”, then the ranging mode is changed to

“Hold” at the same time.

*

Note：

When ranging mode is set to HOLD, the measurement range is fixed at current range. Overload symbol “-----” will be displayed if the impedance under test exceeds the current effective measurement range or display range.

Range

No.

Range

Resistor

Range

Up

Range

Down

0 100kΩ

Ï

20kΩ

1

2

3

4

10kΩ

1kΩ

100Ω

20Ω

Ï

2kΩ

Ï

200Ω

Ï

20Ω

Ï

Ð

18kΩ

Ð

1.8kΩ

Ð

180Ω

Ð

18Ω

Ð

Table 4-2 Ranges

19

TH2821A OPERATION MANUAL

*

Note：

How to calculate the measurement range

Example: Assume capacitance C=210pF, dissipation D=0.0010 and test frequency f=1 kHz.

Solution:

Z

X

=

R

X

+ j

2 π

1 fC

X

No. 2.

Z

X

≈

2 π

1 fC

X

=

2 × 3 .

1416 ×

1

1000 × 210 × 10 − 9

≈ 757 .

9 Ω

From the Table 4-2, we can get the correct measurement range is

4. Data Hold

Press DH key to freeze the display, press DH key again to release.

3.2.2 Second Key Functions:

1. Correction Function z Press u key to select the second function, “SHIFT” will be lighted on the screen. z Press CLEAR key to enter the correction function, the following information will be displayed on the screen.

Figure 4-2 Correction Display

20

TH2821A OPERATION MANUAL z Clear (Clear) is displayed in the primary parameter display area, OpeN (OPEN), Short (Short) or Quit (Quit) will be displayed in the secondary parameter display area.

*

Note：

OpeN (OPEN), Short (Short) and Quit (Quit) are selected and displayed automatically by the meter according to the impedance value of the device under test. z Press

}

key to cancel the correction operation and return to the measurement state. Press start the correction measurement. x

key to z When correction measurement is finished, PASS or FAIL will be displayed on the screen, see Figure 4-3 z Press

Figure 4-3 Open correction Passed

}

key to abort the current correction data measurement and return to the measurement. The previous correction data will still be stored.

*

Note：

1． The correction function must be used for accurate measurement.

The correction function can eliminate the stray admittance

(capacitance, and inductance) and the residual impedance

(resistance and reactance) induced by test fixture, test leads and

21

TH2821A OPERATION MANUAL instrument itself. Perform the correction operation again if the measurement conditions are changed such as test fixture and environment temperature.

2． It is recommended to perform the open and short correction at the same time.

3． During short correction period, FAIL (FAIL) will be displayed in the secondary parameter display area when short correction is failed.

Make sure that the measurement contacts are shorted reliably and perform the short correction again.

4． TH2821A measures the correction data at all frequency points and all measurement ranges. The correction data is stored in the non-volatile memory. So you don’t have to perform the correction again, if the test conditions are not changed.

5． Open and short corrections are automatically selected by the instrument according to the impedance value under test. If there is a component in the fixture or if there is error with the instrument, Quit (Quit) will be displayed in the secondary parameter display area.

2. Equivalent Circuit z Press u key to select the second function, “SHIFT” will be lighted on the screen. z Press EQU key to select the Series or Parallel circuit mode. (Refer to Figure4-1)

*

Note：

1． The actual C, R and L are not the ideal pure C, R and L. Normally an actual component can be regarded as the combination of an ideal resistor and an ideal reactor in series or parallel circuit mode.

2． TH2821A can convert between the two different equivalent circuit modes using the following equations. The measurement values of the two different circuit modes maybe different under different quality factor Q (or dissipation factor D).

22

TH2821A OPERATION MANUAL

Capacitance Cp: from parallel to series

Cp

Circuit Mode：

Rp

Dissipation：

D

Series： C

S

=

=

1

2 π fC

P

( 1 +

D

R

P

2

=

)

C

P

1

Q

R

S

=

R

P

D

2 ( 1 +

D

2 )

Capacitance Cs：from series to parallel

Circuit Mode： Cs

Rs

Dissipation:

D

= 2 π fR

S

C

S

=

1

Q

Parallel:

R

C

P

P

=

= 1

R

S

( 1 +

( 1 +

D

2 )

C

S

D

2 ) D

2

Inductance Lp：from parallel to series

Lp

Circuit Mode：

Rp

Dissipation:

D

Series: L

S

R

S

2

R fL

P

P

= 1 ( 1 +

=

1

Q

D

2 )

L

P

=

23

R

P

D

2 ( 1 +

D

2 )

TH2821A OPERATION MANUAL

Inductance Ls：from series to parallel

Lp Rp

Dissipation：

D

Parallel:

L

P

=

=

2 π

R

S fL

S

( 1 +

=

1

Q

D

2 ) L

S

R

P

=

R

S

( 1 +

D

2 ) D

2

Here parameter with subscript s means the series mode, parameter with subscript p means the parallel mode.

3. From the above equations, we can conclude that the conversion between series and parallel is determined by D 2 or Q 2 （Q=1/D）.

The value of D 2 or Q 2 directly determined the parameter values in different circuit mode.

Example:

Three capacitors have the same series capacitance: Cs=0.1µF, but their dissipations are different with each other: D1=0.0100,

D2=0.1000, D3=1.0000. According to the above equation, we can get their capacitance in parallel mode:

Cp1 = 0.09999 µF

Cp2 = 0.09901 µF

Cp3 = 0.05000 µF

We can find that Cs is almost the same with Cp when D is very small (Ｄ< 0.01), but when D is more than 0.01，Cp and Cs are different obviously. For example: When D = 0.1，the difference is

1%，but when D = 1，the difference is almost 50%.

3. Alarm Setup z Press u key to select the second function, “SHIFT” will be lighted on the screen.

24

TH2821A OPERATION MANUAL z Press BUZZER, the following information will be displayed on the LCD screen： z Use r and q

Figure 4-4 Alarm Setup

keys to select following alert modes in turn.

OFF Alert off

P1 P1 alert mode

P2 P2 alert mode

P3 P3 alert mode

Ng NG alert mode z Press x to save the alert setup and return to the measurement state. z press z Press

} u

to abort the alert setup without change.

4. Display Mode

key to select the second function, “SHIFT” will be lighted on the screen. z Press DISPLAY key to select the display mode: Direct,

Absolute deviation（∆）, Percent deviation（∆%）.

*

Note：

1． Absolute deviation （∆）display mode

25

TH2821A OPERATION MANUAL

Figure 4-5 Absolute deviation（∆）display mode

∆ =

X x

−

X std

Where X x

is the measurement value, X std

is the standard value.

2． Percent deviation（∆%）display mode

Fixture 4-6 Percent deviation（∆%）display mode.

∆ % =

X x

X

− std

X std

⋅ 100 %

26

TH2821A OPERATION MANUAL

5. Sorting Setup

Â

Key Convention：

Key Main Menu Data Input r Select the former item Select the left digit q Select the next item Select the right digit p o

Select parameter for

StD setup

Select parameter for

StD setup

Increase the digit, move the point left and set the unit

Decrease the digit, move the point right and set the unit x

Enter the sub menu Confirm the data input, and

} Return to the measurement state Return to the main menu

Table 4-4 Key convention in sorting setup z Press u key to select the second function, “SHIFT” will be lighted on the screen. z Press LIMIT to enter the sorting setup, P1~ will be flashing on the screen, and the value of P1~ is also displayed. z Use r, q to select the following sorting parameters:

P1_: Low limit of P1

P1~: High limit of P1

P2_: Low limit of P2

P2~: High limit of P2

P3_: Low limit of P3

P3~: High limit of P3

27

TH2821A OPERATION MANUAL

Q_: Low limit of Q

D~: High limit of D

StD: Standard value

}

key to abort the sorting setup and return to z Press the measurement state. z Press x key to select a parameter and enter the data input operation.

Figure 4-7 Sorting Limit Setup z Use r, q keys to select a digit or the point. z Use p , o keys to set the numeric value. z Press } to return to the main menu. z Press x to confirm and save the numeric data. z Select parameter STD to set the standard Value.

Figure 4-8 Standard Value Setup z Use r, q keys to select a digit, the point or the unit. z Use p , o keys to set the numeric data and unit. z Press

}

to return to the main menu.

28

z Press

TH2821A OPERATION MANUAL x

to confirm and save the numeric data.

Sorting

Setup

N D ≤ Dmax

Q ≥ Qmin

Y

P1min ≤ ∆% ≤ P1max

N

P2min ≤ ∆% ≤ P2max

N

P3min ≤ ∆% ≤ P3max

N

NG

Y

Y

Y

P1

P2

P3

END

Figure 4-8 Sorting Flow Chart

29

TH2821A OPERATION MANUAL

6. Other Functions： z Press u key to select the second function, “SHIFT” will be lighted on the screen. z Press MENU key, APO will be flashing on the screen.

Current delay time is also displayed. x

key to enter the auto power off function z Press setup, current delay time flashes on the screen. z Use p , o keys to select 5’, 10’, 20’,30’ or OFF. z Press x key to confirm the current delay time and return to the main menu.

*

Note：

When an external DC adapter is used, APO function is disabled automatically. z Use r, q keys to select “CAL” function. z Press x

key to enter the calibration function. This function is protected with password and is not available for users.

3.3 Battery recharge

*Note：

The instrument will not be started, when the battery is weakening. Recharge the battery immediately by using

DC Adaptor Power Supply. z Battery Power Indicator will flash when charging.

30

TH2821A OPERATION MANUAL z Charging may disturb measurement result sometimes. z The battery must be 9V series Nickel Metal Hydride rechargeable battery. For example GP20R8H and

LH-2007HC. 。 z 2~3 hours for charging and 5~6 hours for using.

3.4 Clearing Instruction

To clean the instrument, use a soft cloth slightly dipped in water. Do not spray cleanser directly onto the instrument, since it may leak into the cabinet and cause damage. Do not use chemicals containing benzine, alcohol or aromatic hydrocarbons.

31

TH2821A OPERATION MANUAL

Appendix

Message Code Table ： clear Clear: Correction

OpeN Open: Open correction short Short: Short correction

P1~

P1_

Mg

Q_

D~

Std

P1 — : High limit of P1 Bin

P1_: Low limit of P1 Bin

NG: No-Good

Q_: Low limit of quality factor

D_: High limit of dissipation factor

Std: Standard value (Nominal value)

APO: Auto Power Off ApO

Cal

Psd

Alert

OM

Off pass faIl

CAL: Accuracy Calibration

PSD: Password

Alert

ON

OFF

Pass

Fail

Quit Quit

First Edition2005-11

32