UNI-T UT209 Operating Manual

Model UT209

OPERATING MANUAL

Table of Contents
Title Page

Overview
Unpacking Inspection
Safety Information
Rules For Safe Operation
International Electrical Symbols
The Meter Structure
Functional Buttons
The Effectiveness of Functional Buttons
Display Symbols
Measurement Operation
A. DC/AC Voltage Measurement
B. Measuring Resistance
C. Testing Diodes
D. Testing for Continuity
E. Frequency Measurement
F. DC Current Measurement

3
4
5
6
9
10
11
13
14
17
17
19
21
23
25
27

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Title Page

30
32
33
33
34
35
35
36
37
38
38
39
40
40
41
41
42

G. AC Current Measurement
Sleep Mode
Specifications
A. General Specifications
B. Environmental Requirements
Accuracy Specifications
A. DC Voltage
B. AC Voltage
C. Resistance
D. Diode Test
E. Continuity Test
F. Frequency
G. DC Current
H. AC Current
Maintenance
A. General Service
B. Replacing the Battery

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Overview

This Operating Manual covers information on safety and cautions. Please read the
relevant information carefully and observe all the Warnings and Notes strictly.

Warning

To avoid electric shock or personal injury, read the “Safety Information” and
“Rules for Safe Operation” carefully before using the Meter.

Digital Clamp Multimeter Model UT209 (hereafter referred to as “the Meter”) are 3
3/4 digits with steady operations, fashionable structure and highly reliable measuring
instrument. The Meter uses large scale of integrated circuit with double integrated
A/D converter as its core and has full range overload protection.

The Meter can measure AC/DC Voltage, AC/DC Current, Frequency, Resistance,
Diodes, Continuity and etc.

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Item Description Qty

1
2
3
4

English Operating Manual
Test Lead
Tool Box
9V Battery (NEDA1604A or 6LF22)

1 piece
1 pair
1 piece
1 piece

Unpacking Inspection

Open the package case and take out the Meter. Check the following items carefully
to see any missing or damaged part:

In the event you find any missing or damage, please contact your dealer immediately .

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Safety Information

This Meter complies with the standards IEC61010: in pollution degree 2, overvoltage
category (CAT. II 600V, CAT. III 300V) and double insulation.

CAT. II: Local level, appliance, PORTABLE EQUIPMENT etc., with smaller transient
overvoltages than CAT. III.
CAT. III: Distribution level, fixed installation, with smaller transient overvoltages than
CAT. IV

Use the Meter only as specified in this operating manual, otherwise the protection
provided by the Meter may be impaired.

In this manual, a Warning identifies conditions and actions that pose hazards to the
user, or may damage the Meter or the equipment under test.

A Note identifies the information that user should pay attention to.
International electrical symbols used on the Meter and in this Operating Manual are

explained on page 9.

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Rules For Safe Operation

To avoid possible electric shock or personal injury, and to avoid possible
damage to the Meter or to the equipment under test, adhere to the following
rules:

Warning

Before using the Meter inspect the case. Do not use the Meter if it is
damaged or the case (or part of the case) is removed. Look for cracks or
missing plastic. Pay attention to the insulation around the connectors.
Inspect the test leads for damaged insulation or exposed metal. Check the
test leads for continuity. Replace damaged test leads with identical model
number or electrical specifications before using the Meter.
Do not apply more that the rated voltage, as marked on the Meter , between
the terminals or between any terminal and grounding.
When measurement has been completed, disconnect the connection between
the test leads and the circuit under test, remove the testing leads away
from the input terminals of the Meter and turn the Meter power off.
The rotary switch should be placed in the right position and no any

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changeover of range shall be made during measurement is conducted to
prevent damage of the Meter.
Do not carry out the measurement when the Meter’s back case and battery
compartment are not closed to avoid electric shock.
Do not input higher than 600V between the two Meter’s input terminal to
avoid electric shock and damages to the Meter.
When the Meter working at an effective voltage over 70V in DC or 33V rms
in AC, special care should be taken for there is danger of electric shock.
Use the proper terminals, function, and range for your measurements.
Do not use or store the Meter in an environment of high temperature,
humidity , explosive, inflammable and strong magnetic field. The performance
of the Meter may deteriorate after dampened.
When using the test leads, keep your fingers behind the finger guards.
To avoid electric shock, do not touch the bare wires, connectors, unused
input terminals or the circuit under testing during measurement.
Disconnect circuit power and discharge all high-voltage capacitors before
testing resistance, continuity and diode.
Replace the battery as soon as the battery indicator appears. With a
low battery , the Meter might produce false readings that can lead to electric
shock and personal injury.

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When servicing the Meter, use only the same model number or identical
electrical specifications replacement parts.
The internal circuit of the Meter shall not be altered at will to avoid damage
of the Meter and any accident.
Soft cloth and mild detergent should be used to clean the surface of the
Meter when servicing. No abrasive and solvent should be used to prevent
the surface of the Meter from corrosion, damage and accident.
The Meter is suitable for indoor use.
Turn the Meter off when it is not in use and take out the battery when not
using for a long time.
Constantly check the battery as it may leak when it has been using for
some time, replace the battery as soon as leaking appears. A leaking
battery will damage the Meter.

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International Electrical Symbols

AC (Alternating Current)
DC (Direct Current)
AC or DC
Grounding
Double Insulated
Warning. Refer to the Operating Manual
Deficiency of Built-In Battery
Continuity Test
Diode
Danger of High Voltage
Conforms to Standards of European Union

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Figure 1

The Meter Structure (see figure 1)

Hand Guards: to protect user’s hand
from touching the dangerous area.
Trigger: press the lever to open the
transformer jaws. When the pressure
on the lever is released, the jaws will
close.
Functional Buttons
Input Terminals
LCD Display
Rotary Switch
Transformer Jaw: designed to pick up
the AC and DC current flowing through
the conductor. It could transfer current
to voltage. The tested conductor must
vertically go through the Jaw center.

1.

2.

3.

4.

5.

6.

7.

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Press SELECT button to select the alternate functions including
V

, and

Button Operation Performed
SELECT

PMAX/PMIN

Press HOLD to enter the Hold mode in any mode, the Meter
beeps.
Press HOLD again to exit the Hold mode to return to measurement
mode, the Meter beeps.

HOLD

Functional Buttons

Below table indicated for information about the functional button operations.

Press and hold for 2 seconds to enter that function internal
calibration.
Press the button once to start recording of maximum peak value.
Press the button again to start recording of minimum peak value.
Press and hold for one second to exit PMAX/PMIN mode.

Press once to turn the display backlight on.
It will automatically off after around 15 seconds.

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Button Operation Performed

HOLD

Hz

ZERO

Press ZERO to display the present value as stored value and
display zero. After that, all the measurement result displayed
will automatically subtract the stored value.
Press ZERO again to display the stored value.
Press and hold ZERO to exit and back to normal operation.

Turn the rotary switch or press SELECT button can also exit
Hold mode.
Press HOLD button for 2 seconds when turning on the Meter to
display full icon.

When the Meter is at V , A and A

, press the button to
measure frequency. But the frequency readings obtained from
these ranges are only for reference,

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SELECT MAX/MIN

HOLD

Hz

ZERO

%Hz

44A

1000A

40A

1000A

N/A

N/A

N/A

N/A

N/A
N/A

N/A

Rotary Switch
Positions

V

Functional Buttons

N/A
N/A

The Effectiveness of Functional Buttons

Not every functional buttons can be used on every rotary switch positions. Below
table describe which functional buttons can be used on which rotary switch positions

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Figure 2

Display Symbols (see figure 2)

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Number Symbol Meaning

1

2

3
4
5
6
7

8
9
10
11

Hz,
kHz,
MHz

,
k ,
M

PMAX
PMIN

ZERO

Hz: Hertz. The unit of frequency.
KHz: Kilohertz. 1 x 103 or 1000 hertz.
MHz: Meghertz. 1 x 106 or1,000,000 hertz.

: Ohm. The unit of resistance.
k :Kilohm. 1×103 or 1000 ohms
M :Megohm. 1×106 or 1,000,000 ohms
Maximum peak reading displayed
Minimum peak reading displayed
Indicator for relative value zeroing
Data hold is active
The Meter is in the auto range mode in which the
Meter automatically selects the range with the best
resolution.
True RMS indicator
Indicator for AC voltage or current
Indicates negative reading
Indicator for DC voltage

H

AUTO

RMS
AC

DC

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Number Symbol Meaning

12

13
14
15
16
17
18
19

The battery is low.
Warning: To avoid false readings, which

could lead to possible electric shock or
personal injury, replace the battery as soon as
the battery indicator appears.

Sleep mode is on
Analogue bar graph ruler
Analogue Bar Graph
Test of diode
The continuity buzzer is on
Amperes (amps). The unit of current.
Volts. The unit of voltage.
mV: Millivolt. 1×10

-3

or 0.001 volts

A

mV, V

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A.DC/AC Voltage Measurement (see figure 3)

To avoid harms to you or damages to the Meter from eletric shock, do not
attempt to measure voltages higher than 600V AC/DC, although readings may
be obtained.

The DC Voltage ranges are:
400mV, 4V, 40V, 400V and 600V

The AC Voltage ranges are:
400mV, 4V, 40V, 400V and 600V

Red Black

Red Black

Measurement Operation

Figure 3

Warning

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To measure DC/AC voltages, connect the Meter as follows:

Insert the red test lead into the V Hz terminal and black test lead into the COM
terminal.
Set the rotary switch to V . DC mesaurement mode and auto ranging is a default.
Press SELECT to switch to AC measurement mode.
Press Hz button to measure frequency , but the frequency readings obtained
from this range is only for reference.
Connect the test leads across with the object being measured.
The measured value shows on the display.

1.

2.

3.

4.

Note

When DC/AC voltage measurement has been completed, disconnect the connection
between the testing leads and the circuit under test and remove testing leads
from the input terminals.

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B.Measuring Resistance (see figure 4)

T o avoid damages to the Meter or to the devices
under test, disconnect circuit power and
discharge all the high-voltage capacitors before
measuring resistance.

The resistance ranges are:
400 , 4k , 40k , 400k and 40M

To measure resistance, connect the Meter as
follows:

Insert the red test lead into the V Hz terminal
and black test lead into the COM terminal.
Set the rotary switch to Resistance
measurement is a default or press SELECT
to switch to measurement mode.

1.

2.

Red Black

Figure 4

Warning

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3. Connect the test leads across with the object being measured.
The measured value shows on the display.

Note

To obtain a more precise reading, you could remove the objects being tested from
the circuit when measuring.
When resistance measurement has been completed, disconnect the connection
between the testing leads and the circuit under test and remove testing leads
from the input terminals.

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C. Testing Diodes (see figure 5)

To avoid damages to the Meter or to the devices
under test, disconnect circuit power and
discharge all the high-voltage capacitors before
testing diodes.

Use the diode test to check diodes, transistors, and
other semiconductor devices. The diode test sends
a current through the semicondutor junction, then
measure the voltage drop across the junction. A
good silicon junction drops between 0.5V and 0.8V.

Red Black

Figure 5

Warning

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Insert the red test lead into the V Hz terminal and black test lead into the COM
terminal.
Set the rotary switch to

Press SELECT to switch to measurement
mode.
For forward voltage drop readings on any semiconductor component, place the
red test lead on the component’s anode and place the black test lead on the
component’s cathode.

1.

2.

3.

Note

To obtain a more precise reading, you could remove the objects being tested from
the circuit when measuring.
When diode testing has been completed, disconnect the connection between the
testing leads and the circuit under test and remove testing leads from the input
terminals.

To test the diode out of a circuit, connect the Meter as follows:

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D. Testing for Continuity (see figure 6)

To avoid damages to the Meter or to the devices
under test, disconnect circuit power and
discharge all the high-voltage capacitors before
measuring continuity.

To test for continuity, connect the Meter as follows:

Insert the red test lead into the V Hz terminal
and the black test lead into the COM terminal.
Set the rotary switch to and press
SELECT button to select measurement mode.
The buzzer sounds if the resistance of a circuit
under test is less than 30 .
The buzzer may or may not sound if the
resistance of a circuit under test is between 30
to 100 .
The buzzer does not sound if the resistance of

1.

2.

3.

4.

5.

Red Black

Figure 6

Warning

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a circuit under test is higher than 100

Note

When continuity testing has been completed, disconnect the connection between
the testing leads and the circuit under test and remove testing leads from the
input terminals.

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E. Frequency Measurement (see figure 7)

To avoid harms to you or damages to the Meter
from eletric shock, do not attempt to measure
voltages higher than 600V AC/DC, although
readings may be obtained.

The frequency ranges are:
4kHz, 40kHz, 400kHz, 4MHz and 40MHz.

Insert the red test lead into the V Hz terminal
and the black test lead into the COM terminal.
Set the rotary switch to Hz.
Connect the test leads across with the object
being measured.
The measured value shows on the display.

1.

2.

3.

To measure frequency, connect the Meter as follows

Red Black

Figure 7

Warning

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Note

The maximum amplitude must not exceed 30Vrms.
When frequency measurement has been completed, disconnect the connection
between the testing leads and the circuit under test, and remove the testing leads
away from the input terminals of the Meter.

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F. DC Current Measurement (see figure 8)

The operating temperature must be 0 ~40
when measuring current.

The measurement ranges of current are: 40A and
1000A .

Set the rotary switch to 40A or 1000A .
When the Meter is at 400A range, the LCD
displays 00.00. Press ZERO for zeroing if it does
not display zero. It allows 10 bouncing digits
after zeroing.
When the Meter is at 1000A range, it
automatically separate 400A and 1000A
range. The initial stage is 400A , the Meter
displays 0.0. Press ZERO for zeroing if it does

1.

2.

3.

To measure current, do the following:

Warning

Figure 8

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not display zero. When the testing current is greater than 400A , it is not

necessary to zero.
Hold the Meter tight, don’t release. The Hall components are very senstive not
only to the magnet but also to heat and machines reaction force. Any shock will
cause the changing in reading in the short time.
Press the lever to open the transformer jaw.
Center the conductor within the transformer jaw, then release the Meter slowly
until the trasnformer jaw is completely closed, Make sure the conductor to be
tested is placed at the center of the transformer jaw, otherwise it will casue
deviation. The Meter can only measure one conductor at a time, to meausre
more than one condutor at a time will cause deviation.

4.

5.

6.

Below testnig method can obtain more accurate DC current:

Power off the tested conductor current,
Press the lever to open the transformer jaw.
Center the conductor within the transformer jaw, then release the Meter slowly
until the transformer jaw is completely closed. Make sure the conductor to be
tested is placed at the center of the transformer jaw, otherwise it will cuase ±1.0
% deviation.
When the reading is stabled at the minimal, press ZERO to display zero

1.

2.

3.

4.

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Note

Press ZERO to display the present value as stored value and display zero.
After that, all the measurement result displayed will automatically subtract
the stored value.

Press ZERO again to display the stored value.
Press and hold ZERO to exit and back to normal operation.

5. Power on the tested conductor current, read out the reading after the Meter is
stable.

6. This DC currrent measurment result is more accurate.

The Meter adopts relative value zeroing.

When measuring DC current, if the reading is positive, then the current direction
is from up to down (see figure 9: the front case face up while the bottom case
face down)
When current measurement has been completed, disconnect the connection
between the conductor under test and the jaw, and remove the conductor away
from the transformer jaw of the Meter.

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G. AC Current Measurement (see figure 9)

The operating temperature must be 0 ~40
when measuring current.

The measurement ranges of current are: 40A and
1000A .

Set the rotary switch to 40A or 1000A .
Hold the Meter tight, don’t release. The Hall

components are very senstive not only to the
magnet but also to heat and machines reaction
force. Any shock will cause the changing in
reading in the short time.
Press the lever to open the transformer jaw.
Center the conductor within the transformer jaw,
then release the Meter slowly until the trasnformer
jaw is completely closed, Make sure the
conductor to be tested is placed at the center of

1.

2.

3.

4.

Figure 9

Warning

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Note

When measuring AC current range, It may have unstable or wrong sensed readings,
it will not affect measurement result.
Change to AC:
Couple AC and True RMS response method. Input sine wave to adjust. Non sine
wave must follow the below data to adjust:

Peak factor: 1.4~2.0, add 1.0% on the stated accuracy.
Peak factor: 2.0~2.5, add 2.5% on the stated accuracy

Peak factor: 2.5~3.0, add 4.0% on the stated accuracy.
When current measurement has been completed, disconnect the connection
between the conductor under test and the jaw, and remove the conductor away
from the transformer jaw of the Meter.

the transformer jaw, otherwise it will casue deviation. The Meter can only measure
one conductor at a time, to meausre more than one condutor at a time will cause
deviation.

When the measuring current >1A, press

Hz button to toggle between AC current
and frequency measurement mode. But the frequency readings obtained from
this range is only for reference.

5.

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Sleep Mode

To preserve battery life, the Meter automatically turns off if you do not turn the rotary
switch or press any button for around 30 minutes.

The Meter beeps 3 times in one minute before entering Sleep Mode and one long
beep just before entering Sleep Mode.

The Meter can be activated by turning the rotary switch or pressing the button except
the

button, details see the ‘The Effectiveness of Functional Buttons” on page

11-12
If the Meter is activated by pressing button, the Meter will keep the measurement

value before entering Sleep Mode.

Press PMAX/PMIN, ZERO or

Hz to turn on the Meter can disable the Sleep Mode

feature.

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l Maximum Voltage between any Terminals and grounding: Refer to different
range input protection voltage.

l Display: 3 3/4 digits LCD display, Maximum display 4000.
l Polarity: Auto
l Overloading: Display OL or –OL.
l Battery Deficiency: Display .
l Sampling: 3 times per second.
l Measurement Deviation: The conductor being meaured is not placed in the

center of the jaw during AC/DC current measurement, it will cause extra ±1%
deviation based on the stated accuracy.

l Drop Test: 1 meter drop test passed.
l Max. Jaw Size: 55mm diameter.
l Projected Max. Current conductor size: 45mm diameter.
l Electro-Magnetic: When carrying out measurement near the electro-magnetic,

it may cause unstable or wrong reading.
l Power: 1 x 9V battery (6LF22 1604A)

Specifications

A.General Specifications:

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l Battery Life: typically 150 hours (alkaline battery)
l Dimensions: 285.3mm x 105mm x 44.5mm
l Weight: Approximate 533g (battery included)

B. Environmental Requirements

l The Meter is suitable for indoor use.
l Altitude: Operating: 2000m

Storage: 10000m
l Safety/ Compliances: IEC 61010 CAT.II 600V, CAT.III 300V
over voltage and double insulation standard, pollution degree 2.

l Temperature and humidity:
Operating:

0

~30 ( 80%R.H)

30

~40 ( 75%R.H)

40

~50 ( 45%R.H)

Storage:

-20

~+60 ( 80%R.H)

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Accurate Specifications

Accuracy: (a% reading + b digits), guarantee for 1 year.
Operating temperature: 23

5

Relative humidity: 85%R.H
Temperature coefficient: 0.1×(specified accuracy)/1

A. DC Voltage

Range

400mV
4V
40V
400V
600V

Resolution

0.1mV

0.001V

0.01V

0.1V
1V

Accuracy

(0.8%+3)

(0.8%+1)

(1 %+3)

Overload protection

600V DC/AC

Remark: Input Impedance: 10MΩ

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B. AC Voltage

Range
400mV
4V
40V
400V
600V

Resolution

0.1mV

0.001V

0.01V

0.1V
1V

Accuracy

(1.2%+20)

(1.2%+5)

(1.5%+5)

Overload protection

600V DC/AC

Remarks:

Input Impedance: 10MΩ
Frequency Response:

400mV range: 50~100Hz
Other ranges: 40Hz~400Hz
Change to AC:
Couple AC and True RMS response method. Input sine wave to adjust. Non
sine wave must follow the below data to adjust:

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Peak factor: 1.4~2.0, add 1.0% on the stated accuracy
Peak factor: 2.0~2.5, add 2.5% on the stated accuracy
Peak factor: 2.5~3.0, add 4.0% on the stated accuracy.

C. Resistance

Range
400Ω
4kΩ
40kΩ
400kΩ
4MΩ
40MΩ

Resolution

0.1Ω
1Ω
10Ω
100Ω
1kΩ
10kΩ

Accuracy

(1.2%+2)

(1%+2)

(1.2%+2)
(1.5%+2)

Overload protection

250VAC

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D. Diode Test

Range Resolution

1mV

Accuracy

0.5V~0.8V (Open
circuit voltage
approx. 3.0V)

Overload protection

250VAC

E. Continuity Test

Range Resolution

0.1

Accuracy
l The buzzer sounds if the resistance of a

circuit under test is less than 30Ω.
l The buzzer may or may not sound if the
resistance of a circuit under test is between
30Ω to 100Ω.
l The buzzer does not sound if the resistance
of a circuit under test is higher than 100Ω
Open circuit voltage approx. –1.2V

Overload
protection

250VAC

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Remarks:
l Input Sensitivity as follows:
When 100kHz: 300mV rms
When>100kHz: 600mV rms
l Input amplitude a: 300mV a 30V rms

F. Frequency

Range
4kHz
40kHz
400kHz
4MHz
40MHz

Resolution

0.001kHz

0.01kHz

0.1kHz

0.001MHz

0.01MHz

Accuracy

(0.1%+3)

Overload protection

250VAC

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G. DC Current

Range

40A

1000A

Resolution

0.01A

1A

Accuracy

(2%+40)

(2%+8)

Overload protection

250VAC

H. AC Current

Range

40A

1000A

Resolution

0.01A

1A

Accuracy

(2%+40)

(2%+8)

Overload protection

250VAC

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MAINTENANCE

This section provides basic maintenance information including battery replacement
instruction.

Do not attempt to repair or service your Meter unless you are qualified to do
so and have the relevant calibration, performance test, and service information.

To avoid electrical shock or damage to the Meter, do not get water inside the
case.

Periodically wipe the case with a damp cloth and mild detergent. Do not use
abrasives or solvents.
To clean the terminals with cotton bar with detergent, as dirt or moisture in the
terminals can affect readings.
Turn the Meter power off when it is not in use.
Take out the battery when it is not using for a long time.
Do not use or store the Meter in a place of humidity , high temperature, explosive,

Warning

A. General Service

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inflammable and strong magnetic field.

To avoid false readings, which could
lead to possible electric shock or
personal injury, replace the battery as
soon as the battery indicator “ ”
appears.

Make sure the transformer jaw and the
tets leads are disconected from the
circuit being tested before opening the
case bottom.

Figure 10

B. Replacing the Battery (see figure 10)

Warning

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To replace the battery:.

1. Turn the Meter off and remove all the connections from the input terminals

2. Turn the Meter’s front case down.

3. Remove the screw from the battery compartment, and separate the battery
compartment from the case bottom.

4. Take out the old battery and replace with a new 9V battery (6LF22, 1604A).

5. Rejoin the case bottom and the battery compartment, and reinstall the screw.

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* END *

This operating manual is subject to change without notice.

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Copyright 2007 Uni-Trend Group Limited.

All rights reserved.
Manufacturer:

Uni-Trend Technology (Dongguan) Limited
Dong Fang Da Dao
Bei Shan Dong Fang Industrial Development District
Hu Men Town, Dongguan City Guang Dong Province
China
Postal Code: 523 925

Headquarters:
Uni-Trend Group Limited
Rm901, 9/F, Nanyang Plaza
57 Hung To Road Kwun Tong Kowloon, Hong Kong
Tel: [phone]
Fax: [phone]
Email: [e-mail]
http://www.uni-trend.com

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