Unit UT268B User manual

P/N:110401111944X
UT268B

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Contents
I. Safety Information .....................................................................................2
II. Introduction ...............................................................................................3
III. Basic Functions Introduction .....................................................................3
IV. Electrical Symbols .....................................................................................3
V. Technical Specifications ............................................................................4
1. Basic Operating Conditions................................................................4
2. Rated Operating Conditions...............................................................4
3. General Specifications ......................................................................4
4. Performance Specifications................................................................6
VI. External Structure .....................................................................................7
VII. Operating Instructions ............................................................................... 8
1. Power On/Off ....................................................................................8
2. Data Hold/Cancellation/Storage ........................................................8
3. Data Viewing/Exit ..............................................................................8
4. Data Deletion ....................................................................................8
5. Display Mode Switching .....................................................................9
6. Testing ..............................................................................................9
VIII. Battery Charging ..................................................................................... 12
IX. Others ..................................................................................................... 12
X. Packing List .............................................................................................13

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I. Safety Information
Thank you for purchasing the product. Before first use, please thoroughly read and
strictly follow the safety information and precautions listed in the user manual, to
avoid electric shock or personal injury.
The product is used for live working, for the sake of your safety, please follow
the national safe production regulations and safe operation procedures.
Please pay attention to the labeled words and symbols at the front and rear
panels.
Check if the product and its accessories are complete. Do not use if damage,
exposure or broken wire occurs. It is forbidden to use if rear cover and battery
cover are not closed in place. Stop use if metal exposure (caused by cracking of
casing or test lead) occurs during use.
Do not measure voltage over 600V. Do not use under strong electromagnetic
fields. It is forbidden to conduct test in places with inflammable and dangerous
substances.
Be sure that the plug of the lead connects with terminal tightly, and that the
direction is correct when performing phase test. Remove the test lead from
measured conductor before disconnecting the test lead with the voltammeter. Do
not make contact with the terminal by hand, to avoid electric shock.
Do not operate the product by wet hand. Avoid rain from dripping on the product.
It is forbidden to use in damp state.
Do not place or keep the product in environments with high temperature, high
humidity, dew or direct sunlight for a long time.
Keep the product surface clean and dry. Do not use clean the product by
corrosives or coarse materials, please wipe the current clamp mildly by soft cloth
(i.e. glasses cloth) dipped with rust-proof dehumidifying lubricant.
Please refrain the voltammeter and the current clamps from impact and
dropping.
Use the product in specified measurement range and operating environments.
Use, disassembly, calibration and maintenance must be performed by
authorized qualified personnel.
The safety warning symbol “ ” in the user manual identifies that the operator
must perform safe operation according to the instructions.
The danger symbol “ ” in the user manual identifies that the operator must
strictly perform safe operation according to the instructions.

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II. Introduction
The Digital 3-Phase Voltammeter, the latest product in clamp meter series, is a
digitalized, multifunctional, high-precision and intelligent multi-parameter
industrial-frequency measurement instrument. Designed with latest
microprocessor technology and digital signal processing technology, UT268B can
measure industrial-frequency parameters (i.e. voltage, RMS current,
active/reactive power, apparent power, industrial frequency, power factor, phase
relation, and others) in direct AC sampling method, identify transformer connection
section and inductive and capacitive circuits, test secondary loop and bus
differential protection system, display phase relations between current
transformers under differential protection, and check if the wiring of electric energy
meter is correct. By using clamp current transformer, this voltammeter can perform
measurement without disconnecting from measured conductor, making it a safe,
accurate and portable electric power meter.
Digital 3-Phase Voltammeter, also known as intelligent 3-Phase Voltammeter,
Multifunctional 3-Phase Voltammeter, Digital Clamp Voltammeter, etc., is
suitable for use in electric power, petrochemical industry, metallurgy, railway,
industrial and mining enterprises, scientific and research institute, metrology
service, electric energy charging system, relay protection system, and more.
III. Functions Introduction
1. Devised with large screen with high-brightness backlight, to clearly display
working state and testing parameters.
2. The ability to measure 3-phase voltage, current, phase, frequency, active power,
reactive power, apparent power, power factor, and overall power.
3. Can be used to measure grid frequency and phase sequence.
4. The function of phase measurement under small current of 5mA allows for
checking wire connection without load.
5. Automatically identify transformer winding and capacitive and inductive loads;
and identify wrong connection of 3P3W and 3P4W.
6. Static storage function to enable store 500 groups of data at most.
IV. Electrical Symbols
Extremely dangerous! The operator must follow the safety
information strictly, otherwise it may present a risk of electric shock,
which can cause personal injury or death.
Danger! The operator must follow the safety information strictly,
otherwise it may present a risk of electric shock, which can cause
personal injury or death.
Warning! The operator must follow the safety information strictly,
otherwise it can cause personal injury or product damage.

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Alternating Current (AC)
Direct Current (DC)
Double Insulated
V. Technical Specifications
1. Basic Operating Conditions
1) Ambient temperature: (23±5)°C
2) Ambient humidity: (45~75)% RH
3) Waveform of measured signal: Sinusoidal wave,  =0.02
4) Frequency of measured signal: (50±0.2)HZ
5) Location of measured current-carrying conductor at the clamp jaws: At center
6) Current amplitude when measuring phase frequency, phase sequence, power
and power factor: 5A±0.2A
7) Voltage amplitude when measuring phase frequency, phase sequence, power
and power factor: 220V±20V
8) Electromagnetic interference to external-reference frequency: Shall be avoided.
2. Rated Operating Conditions
1) Ambient temperature: (-15~+45)°C
2) Ambient humidity: (0~90)% RH
3) Operating altitude: 1500 m
4) Waveform of measured signal: Sinusoidal wave,  =0.05
5) Frequency of measured signal: 45~65HZ
6) Current amplitude when measuring phase frequency, phase sequence, power
and power factor: 20mA~1000A
7) Voltage amplitude when measuring phase frequency, phase sequence, power
and power factor: 20V~600V
8) Location of measured current-carrying conductor at the clamp jaws: Any
location
3. General Specifications
Functions
Measure 3-phase AC voltage, current, phase between
voltages, phase between currents, phase between voltage
and current, frequency, phase sequence, active power,
reactive power, apparent power, power factor, and current
vector sum;
identify transformer connection section,
inductive circuit, and capacitive circuits; and test
secondary loop and bus differential protection system,
display the phase relation between differentially-protected
CTs of each group, check if the wiring of electric energy
meter is correct, repair equipment of measured line, etc.

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Power supply
DC 3.7V large-capacity rechargeable lithium battery
Power consumption
250mA at most with backlight lit up (battery working
duration: >5 hours)
Display mode
LCD display (71×52 mm)
Voltammeter
dimensions
187*191*51 mm (Length*Width*Thickness)
Voltage range
AC 0.00V~600V
Current range
AC 0.0mA~1000A
Phase range
0.0°~360.0°
Frequency range
45.00Hz~65.00Hz
Active power range
0.0W~600Kw
Reactive power
range
0.0W~600kVAR
Apparent power
range
0.0W~600kVA
Power factor range
-1~+1
3-phase overall
power
3-phase overall power, overall apparent power, overall
reactive power and over power factor are displayed in the
line “T”.
Current vector sum
0mA~3000A
Resolution
Voltage: AC 0.01V
Current: AC 0.1mA
Phase: 0.1°
Frequency: 0.01Hz
Active power: 0.1W
Reactive power: 0.1VAR
Apparent power: 0.1VA
Power factor: 0.001
Current vector sum: 1mA
Phase sequence
If the phase sequence of “U1, U2 and U3” or “I1, I2 and I3”
is positive, then the cursor flashes from
left to right in
order; if negative, then from right to left.
Testing rate
About 2 seconds per time
Data hold
When the button “HOLD” is pressed during test, the data
will be held and the symbol “HOLD” is displayed.
Data storage
500 groups of data
USB port
Upload stored data to computer via USB port, so as to
analyze and manage data.
Auto power off
To reduce power consumption, the voltammeter powers
off automatically 15 minutes after it is powered on.
Backlight function
Used in dark environments and at night.
Voltage detection
If the battery voltage is lower than 3.0V, the low battery
symbol is displayed to indicate charging in time.
Product weight
Voltammeter: 450 g (including battery)
Large-caliber current clamp: 440 g × 3
Test lead: 250 g

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Length of test lead
length
1.5 m
Length of current
clamp lead
2 m
Operating
temperature and
humidity
-10°C~40°C; 80%RH
Storage temperature
and humidity
-10°C~60°C; 70%RH
Input impedance
2 M (the input impedance of testing voltage)
Withstand voltage
Apply 1000V/50Hz sinusoidal AC voltage between
voltammeter circuit and casing for one minute.
Insulation
100M(between voltammeter circuit and casing)
Structure
Double-insulated
Applicable safety
regulations
IEC61010-1 CAT III 600V, IEC61010-031, IEC61326,
Pollution Class 2
4. Performance Specifications
Type
Range
Resolution
Basic error
Voltage
AC 0.00V~9.99V
0.01V
± (1.5%rdg+3dgt)
AC 10.0V~99.9V
0.1V
± (1.5%rdg+3dgt)
AC 100V~600V
1V
± (1.5%rdg+3dgt)
Current
AC 0.0mA~9.9mA
0.1mA
± (1.5%rdg+3dgt)
AC 10.0mA ~99.9mA
0.1mA
± (1.5%rdg+3dgt)
AC 100mA ~999mA
1mA
± (1.5%rdg+3dgt)
1.00A~10.00A
10mA
± (1.5%rdg+3dgt)
10.0A~100.0A
0.1A
± (1.5%rdg+3dgt)
100A~1000A
1A
± (1.5%rdg+3dgt)
Phase
0.0°~360°
0.1°
±1°
Frequency
45Hz~65Hz
0.01Hz
±0.1Hz
Power factor
-1~+1
0.001
±0.03
Note 1: The phase error is ±3° under operating condition (For current amplitude
below 30mA, the phase error will be doubled).
<Active PRZHU!3: 9î$î&26ij
Current
Voltage range
10.0V~100.0V
100V~600V
Current
range
10.0mA~99.9mA
0.0100 KW
0.0600 KW
100mA~999mA
0.1000 KW
0.6000 KW
1A~9.99A
1.0000 KW
6.0000 KW
10A~99.9A
10.000 KW
60.000 KW
100A~1000A
100.000 KW
600.000 KW
Accuracy:
± (3%+3dgt)
Resolution:

10.000 KW: 0.0001 KW
10.000 KW: 0.001 KW

UT268B

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1. USB transfer/charging port
2. Charging indicator light
3. 3-phase voltage input ports
4. LCD display
5. Rubber-insulated protective cover
6. Functional buttons
7. 3-phase current input ports
8. Plug of current clamp
9. Large-caliber current clamps
10. Test leads of voltage input
VII. Operating Instructions
Please check if any component of the voltammeter is damaged,
do not use in case any damage is found.
It is forbidden to use the voltammeter in dangerous places.
1. Power On/Off
Press “ ” to power on/off the voltammeter. The voltammeter powers off
automatically 15 minutes after it is powered on.
2. Data Hold/Cancellation/Storage
When the button “HOLD” is pressed under testing mode, the displayed data is held
and the symbol “HOLD” is displayed. Press HOLD to disable data hold. When the
voltammeter holds data, it performs automatic numbering, stores the data held
currently, and displays the numbering of groups (i.e. “Save: 002”). 500 groups of
data can be stored at most, the symbol “FULL” appears if storage is full.
3. Data Viewing/Exit
When the button “MEM” is pressed, the voltammeter enters data viewing mode
and displays the symbol “Read”. Start reading data from Group “Save: 001”. Press
“ ” to read data at an increment of 1, long press “” to read data at an increment
of 10. Press “” to read data at a decrement of 1, long press “” to read data at
a decrement of 10. Press “” and “” to cycle through voltage/current and phase,
active power, reactive power, apparent power, power factor, frequency, and
storage. Press “MEM” to exit data viewing mode and return to testing mode.
4. Data Deletion
Under data viewing mode or testing mode, long press “HOLD” to enter data
deletion mode, press “” to select “YES” or “” to select “NO”, then return to
testing mode after selected.

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Danger! Do not measure voltage line over 600V, otherwise it can
pose a risk of electric shock, which may cause personal injury or
equipment damage.
Danger! Do not measure any line over 1000A, otherwise it may
cause equipment damage.
Please perform wiring strictly according to the user manual. Do
not connect I1, I2 and I3 inversely.
Please remove the test leads from measured line before
disconnecting the test leads with the voltammeter.
The phase relations of the voltammeter is: U1U2, U2U3, U3U1, I1I2,
I2I3, I3I1, U1I1, U2I2 and U3I3, the previous signals exceed the next
ones for all the phases.
The U1, U2 and U3 terminals and the right arrows at the
corresponding current clamps are the same-polarity ends.
For phase testing, the direction of current flowing into the clamp
shall be consistent with the direction of arrow at the clamp.
The voltammeter measure 3-phase AC voltage and current, phase between
voltages, phase between currents, phase between voltage and current, frequency,
active power, reactive power, apparent power, power factor, 3-phase current
vector sum, and identify phase sequence, inductive and capacitive circuits, etc.
Wiring of tests:
Single-phase testing: Connect the measured voltage lines L and N with U1
YELLOW and COM BLACK terminals correspondingly, then the current clamp I1
clamps the measured line L. “U2 GREEN, COM BLACK and I2” or “U3 RED, COM
BLACK and I3” can also be connected.
3-phase 4-wire testing: Connect the measured voltage lines UA YELLOW, UB
GREEN, UC RED and N BLACK with U1 YELLOW, U2 GREEN, U3 RED and
COM BLACK terminals correspondingly, then the current clamps I1, I2 and I3
clamp the measured lines IA, IB and IC correspondingly.
3-phase 3-wire testing: Connect the measured voltage lines UA YELLOW, UC
RED and UB GREEN with U1 YELLOW, U3 RED and COM BLACK terminals,
then the current clamps I1 and I3 clamp the measured lines IA and IC
correspondingly. See “Reference wiring diagrams”.
Inductive and capacitive loads, phase sequence and polarity can be identified
according to the phase relations. If the phase of U1I1 is between 0.0 and 90.0,
then the measured load is inductive; if between 270.0 and 360.0, then capacitive.
If the phase is approximate to 120.0, then the phase sequence is positive and the
polarity is same; if approximate to 120.0 and 300.0, then positive and opposite (the
current clamp may be in reverse direction or the measured line may be connected
inversely); the phase sequence is negative for other phase values (phase loss is
not considered).

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X. Packing List
Voltammeter
1 pcs
Carrying box
1 pcs
Current clamp
3 pcs
Test lead
4 pcs (1 pc for yellow, green, red and
black respectively)
Charger + USB cable
1 set
User manual
1 pcs
The content of this user manual cannot be used as a reason for using the product for special
purposes.
The company is not responsible for other losses caused by use.
The company reserves the right to modify the contents of the user manual. If there are changes,
no further notice will be given.