Tonghui Electronics TH2820 Operation Manual
OPERATION
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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 oper ations 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
contact us
2
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 Stray Capacitance............................................................................................22
Chapter 5 Contents and Warranty..........................................................................................24
1 Contents ............................................................................................................24
2 Warranty..........................................................................................................24
3
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 Main features
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 i nto a maximum of four bins (NG, P1,
P2 and P3).
5．
Equivalent Measurement Circuit:
There are two equivalent circuit models: parallel and series.
4
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
L
Measurement
C
Range
R, |Z| 1 mΩ – 999.99 MΩ
D, Q 0.0001 – 99999
∆% 0.0001% – 99999%
Accuracy (Test
Condition: within
basic
measurement
range,23°C±5°C，
<75%R.H.)
C： 0.3%
L： 0.3%
Z： 0.3%
R： 0.3%
D： ±0.001
Q： ±0.002(1+ Z
(1+ Cx/C
(1+ Lx/L
(1+ Zx/Z
(1+ Rx/R
(1+Zx/Z
Test signal level 0.3V
Ranging Mode Auto, Hold
Equivalent model Series, Parallel
Direct: actual measured value;
Display
∆ : absolute delta;
∆% : delta percent.
Correction Open and Short correction
Test Speed approx. 3 times/second
Test Terminals 5 terminals
% -9999% – +9999%
L 0.0001 µH – 99999 kH
Range of Sorting
Limits
Nominal
value
C 0.0001 pF – 99999 mF
R 0.0001 mΩ – 99999 MΩ
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%）
100 Hz, 120 Hz 1 µH – 9.9999 kH
1 kHz 0.1 µH – 999.99 H
100 Hz, 120 Hz 1 pF – 9.9999 mF
1 kHz 0.1 pF – 999.99 µF
max
max
max
max
max
x/Zmax
+ C
+ L
+ Z
+ R
+ Z
+ Z
)(1+Dx )；
min/Cx
)(1+1/Qx )；
min/Lx
)；
min/Zx
)(1+Qx)；
min/Rx
)(1+Dx+D
min/Zx
min/Zx
rms
2
)+0.0002；
x
)(Qx+1/Qx )；
(1±10%)
5
Chapter 2 Panel Overview
Note:
1. Accuracy of D and Q are delta absolute deviations, the rest are delta percent deviations;
2. Suffix with
value, suffix with
is the actual measured value of this par ameter, suffix with
X
is the minimum value;
min
is the maximum
max
Parameter
C
C
L
L
Z
Z
Z
max
max
min
max
min
max
min
= R
Range
Auto
80µF/f
150pF/f 150pF/f 1900pF/f 10nF/f 100nF/f
159H/f 159H/f 25.3H/f 2.53H/f 253mH/f 25.3mH/f
0.32mH/f
1MΩ 1MΩ 159kΩ 15.9 kΩ 1.59kΩ 159Ω
1.59Ω 15.9kΩ 1.59kΩ 159Ω 15.9Ω 1.59Ω
; Z
max
min
Range0 Range1 Range2 Range3 Range4
1000pF/f
2.53H/f 0.25H/f 25.3mH/f 2.53mH/f 0.32mH/f
= R
min
0.1µF/f 1µF/f 10µF/f 80µF/f
Range Hold
1µF/f
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 pack ed
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.
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Chapter 2 Panel Overview
1 Front Panel
1234 5 6
TONGHUI
ELECTRONICS
TH2820 LCR METER
SORTING
NG P1 P2 P3
TH2820 LCR METER
BUZZER
PARA DISP RANGE
POWER
ON
OFF
FREQ
SETUP
START
HD HS LS LD
UNKNOWN
789
Figure 2-1 Front panel
Following is the description of items 1~9 in Figure 2-1.
No Name Description
1 Parameter
2 Frequency
3 Display Mode
4 Range Displaying range state: Auto, Hold or current range.
5 Bins Indication
6 Buzzer
7 Test Terminals HD, HS, LS and LD
Cursor keys Function table moving and rolling
8 Key
Setup key Entering function table setting
Start key The executing confirmation of command
9 POWER Power switch
Displaying current measured parameters：
L-Q, C-D, R-Q, Z-Q, Z-D or AU TO
Displaying current frequency：100 Hz, 120 Hz or1 kHz
Displaying current display mode of the primary
parameter: DIR, ∆ or ∆%
NG: No-good; P1: Pass1; P2: Pass2; P3: Pass3;
P1, P2, P3 Priority is lower in turn.
Table 2-1 Front Panel Descriptions
7
2 Rear Panel
Chapter 2 Panel Overview
123
FUSE
INPUT
1A
AC
220V
50Hz
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
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