Tonghui TH2773A User manual

OPERATION MANUAL
TH2773A
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Content
Chapter 1 General Introduction.........................................................................................................3
1.1 Product Introduction..............................................................................................................3
1.2 Specifications........................................................................................................................3
1.3 Main functions ......................................................................................................................4
1.4 Structure & Installation.........................................................................................................4
Chapter 2 Operation Instruction........................................................................................................7
2.1 Notice..........................................................................................................................................7
2.2 Operation.....................................................................................................................................7
2.2.1 Power ...............................................................................................................................7
2.2.2 Connecting the DUT........................................................................................................7
2.2.3 Display.............................................................................................................................7
2.2.4 Sorting function................................................................................................................8
2.2.5 Short correction function..................................................................................................9
2.2.6 Error...............................................................................................................................10
Chapter 3 Maintenance & Repair....................................................................................................11
3.1 Maintenance..............................................................................................................................11
3.1.1. Notice............................................................................................................................11
3.1.2 Performance checking....................................................................................................11
3.1.3 Troubleshooting .............................................................................................................11
3.1.4 Signal checking..............................................................................................................12
3.1.5 Standard .........................................................................................................................12
Chapter 4 Product package & Warranty..........................................................................................13
4.1 Product package........................................................................................................................13
4.2 Warranty....................................................................................................................................13

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Chapter 1 General Introduction
1.1 Product Introduction
Applying the most advanced measurement principle, TH2773A is a simple and intelligent
inductance meter with predominant function design, economic price, and fast
measurement speed (8 times/sec). It can measure inductance of different ranges under
different frequencies. It is a good choice for inductor incoming inspection and fast sorting
on product line.The instrument’s outstanding function is its sorting function, which has
simply-operated parameter setting, direct result indication, and beeper function, which can
easily tell the result.
1.2 Specifications
1.2.1 Measurement parameter
L: inductance Q: quality factor
1.2.2 Test frequency:
1kHz±0.02％
100Hz±0.02％
1.2.3 Basic measurement accuracy:
L: ±[1uH+0.3％(1+0.2mH/L+L/20H)](1+1/Q)
Q: ±0.2%
1.2.4 Measurement range:
L: 0.1uH～100H
Q: 0.1～999.9
1.2.5 Test level: 0.3Vrms (no load)
1.2.6 Measurement speed: approx. 8times/sec
1.2.7 Pre-set range (BCD switch):
Nominal inductance: 0.01uH～990H
Inductance error limit: -99.9～99.9％
Quality factor limit: 0～99.9
1.2.8 Temperature: 0°C～40°C
Humidity: ≤80％RH
1.2.9 Power voltage: 220V±10％
Frequency: 50Hz±5％
Power consumption: ≤30W
Dimensions and weight
Dimensions: 270×130×300
Weight: approx. 5Kg

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1.3 Main functions
1.3.1 Display mode: two display windows. Inductance (L) (or percentage deviation ∆％) ,
and quality factor (Q) are synchronously displayed.
1.3.2 Frequency: 100 Hz (conversion switch on), 1 kHz (conversion switch off)
1.3.3 Correction: Perform short correction by operating this key.
1.3.4 Sorting function:
When Q and ∆％meet limit requirement, PASS indicator is on, and beeper alarms
(can be turned on or off);
When Q is not qualified, QNG indicator is on;
When ∆％≥high limit, OVER indicator is on;
When ∆％≤low limit, DOWN indicator is on.
1.3.5 The instrument has strong protective design against concussion.
1.4 Structure & Installation
Front panel description
No. Name Description Function
1 Power Press to ON, to turn on power
2 Trademark & Model
3 Display 4 1/2-digit display L & △% are displayed
4 Display 4-digit display Value of Q is displayed
5 Manufacturer
6 Key switch to select correction
display L-Q or △%-Q;
to select frequency
L: inductance value;
△%: percentage deviation
When L and △% are off, BCD
switch reading is measured.
CLR: short correction
f: on: 100Hz off: 1KHz
7 BCD switch 8, 4, 2, 1 BCD code respectively corresponding to
inductance limit, quality factor limit,
high limit and low limit of inductance
8 LED indicator PASS, OVER, DOWN, QNG
respectively on according to the
sorting result
9 Test terminal HD, HS, LD, LS signal
test terminals
HD: high driving HS: high sampling
LD: low driving LS: low sampling
10 Grounding terminal connecting ground line
terminal
connecting the ground line of the
device under test

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HS
8
UNKNOWN
LDLS
！
100Hz 1kHz
f
CLRL
7
PASS
7
QNG
□
95
x
STANDARD VALUE
□
※(0.XX*10 )µΗ
HD
△%
n
□
n
□
x
□
x
x
□
Lm:
6
SORTING INDICATION
LO:- %
x
□
LIMITS SETUP
Q：
x
□xx □
DOWN
HI: %
□
x
□
xx
□
OVER
3
T H 27 7 3 A Inductance Meter
4
Q
H
∆%
mH
L
2
1
POWER
TONGHUI
ELECTRONICS
ON
OFF
R
Figure 1-1 Front panel overview

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1
Beeper
Figure 1-2 Rear panel overview
Rear panel description
No. Name Description Function
1
Beeper 2-bit switch
ON: When the inductor is qualified, PASS
indicator is on, beeper alarms (it doesn’t in
other states).
OFF: Beeper is turned off.
2 Power
outlet
3 Fuse fuse of 1A
4 Nameplate
220V 50Hz
S/N： 98008
Changzhou Tonghui Electronic Co., Ltd.
2
4 3

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Chapter 2 Operation Instruction
2.1 Notice
2.1.1 After unpacking, check with product package list.
2.1.2 Before operating the instrument, please read the manual thoroughly, or operate the
instrument under professional personnel’s instruction.
2.1.3 Line and neutral line through which power inputs should be of the same model as
those on the instrument’s power plug.
2.1.4 Connect test fixtures or test cable with four test terminals (HD, HS, LS, LD) on front
panel. When test cable is used, HD & HS, LD & LS should have short connection. For the
device under test (DUT) with guard shield, shielding plate should be connected with
grounding terminal of the instrument.
2.1.5 The instrument should be operated in the prescriptive environment. The instrument,
especially test leads connecting with the DUT, should be kept away from strong magnetic
field, to avoid interference.
2.1.6 When the measurement completes or it’s necessary to open the cover of the
instrument, power switch should be pressed to OFF, and please disconnect the instrument
from the power source.
2.2 Operation
2.2.1 Power
Perform the following steps to turn on the instrument:
1. Connect the instrument with the power source;
2. Press power switch to ON;
3. Numbers display in windows. Otherwise, restart the instrument;
4. Warm up for 15 minutes to the state of heat balance.
2.2.2 Connecting the DUT
Connect the DUT, and choose suitable test fixtures or cable. When cable is used, HD &
HS, LD & LS should have short connection. And the DUT’s lead should be clean to keep
good connection with test terminals.
2.2.3 Display
2.2.3.1 Press key switch to select display mode to L (inductance) or △% (percentage
deviation).
L: The instrument doesn’t directly display obtained measurement value in window after the
DUT is inserted, but judge whether the best range is selected. Only when the best range is
selected, are the data sent to be displayed. The inductance is displayed in 4.5-digit, and

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quality factor (Q) in 4-digit.
△%: The instrument selects range according to the set value on BCD, and the result is
output after each measurement. The measurement speed is fast up to 8 times/sec. So the
mode is applied to fast measure batches of devices. The output result is displayed in
3-digit percentage, and quality factor in 4-digit. And ∆％=[(Lx-L)/L]×100%, where L is
nominal value, and Lx is measurement value.
In %△mode, nominal inductance is set in the mode of L×10nuH. For example, when the
nominal inductance is 47 mH, 47mH=47×103uH=0.47×105uH,
The set value should be transformed into two-digit decimal and one-digit power, as the
following figure shows:
2.2.3.2 If L and △% are synchronously off, the instrument is in the state of measuring
BCD switch reading. The set inductance nominal value (L), high limit value (L-), low limit
value (L-), and quality factor limit value (Q-) are displayed, then press L or △% mode key.
The instrument will automatically enter the measurement state after this measurement
completes.
2.2.4 Sorting function
2.2.4.1 At the time of producing inductor or incoming inspection, a large number of
inductors of the same model need measuring. And it needs to be known whether the
component’s parameter is in some particular range, instead of its detailed value. This is
sorting. What the instrument is asked to do is to get the result fast and simply. TH2773A
provides the functions of one-bin inductance sorting and quality factor qualification sorting.
In all the modes of inductance direct reading (L), percentage deviation (△%), and quality
factor (Q), sorting function is valid.
2.2.4.2 Percentage limit and quality factor limit setting
When setting bin limit, inductance qualified bin that data on BCD switch denote is in the
form of percentage, and the default high limit is positive, low limit negative.
For example, the inductance bin limit is set from -12.3％to 45.6％, shown as the following
figure:
And quality factor limit is set to 10.2, shown as the following figure:

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quality factor
The sorting procedure is shown in figure 2-1:
NO YES
NO
YES
NO
YES
NO
YES
Figure 2-1 Sorting procedure
After setting inductance and quality factor limit, insert the inductance, to observe the
indicators on panel to judge whether the inductance is qualified or not. If beeper on rear
panel is turned on, beeper alarms when PASS signal is output.
2.2.5 Short correction function
TH2773 has short correction function. Perform the following steps:
1. Set the instrument’s test terminals to the short state;
2. Press correction key (CLR), and short distributing parameter Lo is measured out;
3. After connecting with the DUT Lx, the actual inductance value can be calculated
according to the formula: Lx=Lx’ (measurement result)-Lo (distributing parameter).
Qx≥Q—
QNG
indicator on QNG indicator off
∆％≤L—
∆%≥L—
OVER
indicator on
DOWN
indicator on
Qx≥Q—
PASS
indicator on
RET

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2.2.6 Error
The instrument’s operating environment and power supply are listed in Chapter 1.2.
Because range of L’s basic accuracy 0.3% and Q’s basic accuracy 0.2% is limited, please
precisely evaluate the instrument’s error when measuring inductor of some inductance
according to Chapter 1.2.3. In different frequencies, ranges that meet basic accuracy are
as follows (Q is considered infinite in ideal state):
1KHz: 100 uH ～1 H
100Hz: 1 mH ～10 H
Error factor (1+1/Qx) is omitted, and value of Q is little, so effect of Q should be
considered. If according to the formula, L’s accuracy is calculated to be 0.8%, and Q is
100, actual accuracy should be 0.808%.
Figure 2-2 Curve of the error