Unit UTE9811+ User manual

User’s Manual
UTE9811+ Smart Digital Power Meter

User’s Manual UTE9811+ Smart Digital Power Meter
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Preface
Thank you for purchasing this brand new UNI-T product. In order to use this product safely and correctly,
please read this manual thoroughly, especially the safety notes.
After reading this manual, it is recommended to keep the manual at an easily accessible place, preferably
close to the device, for future reference.
Copyright Information
Copyright is owned by Uni-Trend Technology (China) Limited.
UNI-T products are protected by patent rights in China and foreign countries, including issued and pending
patents.
UNI-T reserves the rights to any product specification and pricing changes.
UNI-T reserves all rights. Licensed software products are properties of Uni-Trend and its subsidiaries or
suppliers, which are protected by national copyright laws and international treaty provisions. Information in
this manual supersedes all previously published versions.
UNI-T is the registered trademark of Uni-Trend Technology (China) Co., Ltd.
Warranty Service
UNI-T warrants that the product will be free from defects for one year. If the product is re-sold, the warranty
period will be from the date of the original purchase from an authorized UNI-T distributor. Probes, other
accessories, and fuses are not included in this warranty.
If the product is proved to be defective within the warranty period, UNI-T reserves the rights to either repair
the defective product without charging of parts and labor, or exchange the defected product to a working
equivalent product. Replacement parts and products may be brand new, or perform at the same
specifications as brand new products. All replacement parts, modules, and products become the property of
UNI-T.
The “customer” refers to the individual or entity that is declared in the guarantee. In order to obtain the
warranty service, "customer" must inform the defects within the applicable warranty period to UNI-T, and to
perform appropriate arrangements for the warranty service. The customer shall be responsible for packing
and shipping the defective products to the designated maintenance center of UNI-T, pay the shipping cost,
and provide a copy of the purchase receipt of the original purchaser. If the product is shipped domestically
to the location of the UNI-T service center, UNI-T shall pay the return shipping fee. If the product is sent to
any other location, the customer shall be responsible for all shipping, duties, taxes, and any other expenses.

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Guarantee Limit
This warranty shall not apply to any defects or damages caused by accidental, machine parts’ wear and tear,
improper use, and improper or lack of maintenance. UNI-T under the provisions of this warranty has no
obligation to provide the following services:
a) Any repair damage caused by the installation, repair, or maintenance of the product by non UNI-T service
representatives.
b) Any repair damage caused by improper use or connection to an incompatible device.
c) Any damage or malfunction caused by the use of a power source which does not conform to the
requirements of this manual.
d) Any maintenance on altered or integrated products (if such alteration or integration leads to an increase
in time or difficulty of product maintenance).
This warranty is written by UNI-T for this product, and it is used to substitute any other express or implied
warranties. UNI-T and its distributors do not offer any implied warranties for merchant ability or applicability
purposes.
For violation of this guarantee, regardless of whether UNI-T and its distributors are informed that any
indirect, special, incidental, or consequential damage may occur, UNI-T and its distributors shall not be
responsible for any of the damages.
Safety Instructions
To avoid possible electric shock and personal safety problem, please follow the instructions below. Uni-
Trend will not be responsible for the personal safety and property damage caused by the user's failure to
comply with the following terms.
1. Do not usethe damaged instrument. Before using, please checkthe outer shell whether has crack or plastic
lack. Do not use the instrument in flammable and explosive gas, steam or dusty environment.
2. Only trained personnel can execute maintain procedure to avoid fire and personal injury; there must be
personnel supervision in use, otherwise it should be turned off the instrument and its power supply.
3. Before connecting the instrument, observe all marks on the instrumentto learn more about the rated value,
warnings and Notes.
4. The power supply of the instrument is 100-240VAC, 50/60Hz.
5. The instrument is equipped with three core power cord, only use the power cord provided by the
manufacturer to avoid accidental injury; do not plug and unplug the power cord when the instrument is
energizing; do not put other objects on the power cable when using it, and ensure that the power cable is
away from heat source.

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6. Instrument grounding：To prevent the risk of electric shock, please connect the power ground wire.
7. Do not install substitutes or perform unauthorized changes; do not use the instrument whenthe outer shell
opened or looseness.
8. During the test, do not touch terminal blocks and test line to prevent from electric shock; do not plug the
communication port; do not put article on the instrument to protect the instrument, especially pay
attention not to let metal chips, water, oil and other liquids into the internal the interior of the instrument,
otherwise, it may cause unpredictable and serious consequences.
9. Avoid exposed circuits, do not touch exposed connectors and components after the power is turned on.
10. Use the appropriate fuse, only with the fuse type and rating indicator specified for this product.
11. Do not use the instrument that work abnormally; if you suspect that the product has malfunctioned, let
qualified maintenance personnel to check the instrument.
12. Unplug the power cord from the power outlet if the instrument is not to be used for a long time. Please do
not pull the power cord to unplug it; if the instrument need to move, please make sure the power line and
other connecting line is pulled outand use the carrying handle on the side of the instrument, be gentle with
it to prevent collision.
Environmental Condition
The instrument can only use indoors and non-condensing area, the general environmental requirements
shown as below table.
Environmental Condition
Operating Environment
5℃～40℃，20%～80%RH（non-condensing）
Accuracy guaranteed
temperature and humidity
temperature
23℃±5℃，30%～75% R.H.
Storage temperature
-10℃～50℃, non-condensing below 80% R.H.
Operating altitude
≤2000 meters
Explanation：In order to ensure the measurement accuracy, it is recommended to start the operation after
half an hour to warm-up the machine.

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Chapter 1 Inspection and Installment
1.1 Check Packing List
Check with packing list to confirm that accessories has no loss or abnormal. If there have any problem, please
contact with UNI-T distributor or manufacture.
No.
Components
Quantity
Remark
1
Digital power meter
1
UTE9811+
2
Power cable
1
3
RS-232 communication
line
1
4
User’s manual
/
Please download from official website.
http://www.uni-trend.com
Explanation：After confirming that the contents of the package are consistent and there are no problems,
please keep the box and related contents properly, the instrument should meet the encasement
requirements if it return to the factory for service.
1.2 Hand Shank
The hand shank can be adjustment, hold the hand shank in both hands and then pull out two flanks to twist it,
it can be adjust to four positions shown as the following figure.
1. Original Position (Factory Setting)

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2. Testing Position
3. Remove Hand Shank
4. Lift Position

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Chapter 2 Product Introduction
2.1 Product Overview
UTE9811+ smart digital power meter is an economic and portable measuring instrument. It is a multi-
functional measuring instrument which integrating voltage, current, power, power factor and harmonic wave.
The products is widely used in production, testing, evaluation and scientific research and multi-field.
UTE9811+ smart digital power meter adopts high speed CPU for data processing, the sampling resistance of
voltage and current are all use low temperature drift resistor, therefore, the stability and accuracy of
measurement data are guaranteed.
The instrument can measure voltage, current, power, power factor, frequency, voltage crest ratio and
current crest ratio. It also has harmonic analysis and serial communication function.
The instrument has perfect functions, superior performance and simple operation. It meets the needs of
high-speed measurement in production sites, as well as laboratory and R&D measurements. It is widely used
in in the fields of lighting appliances, power tools, householdappliances, electric motors and electric heating
appliances of production lines, laboratories and quality inspection departments.
Characteristics
1. VA broken code screen display for intuitive reading.
2. Multi-window simultaneous display of voltage, current, power, power factor, frequency, voltage crest ratio,
current crest ratio and harmonic measurement data.
3. Harmonic measurement adopts phase-locked loop (PLL) synchronization method. The maximum of
harmonic analysis is 50 times.
4. Voltage and current range can switch automatically, It will help for improving the measurement accuracy.
5. Average function can make the reading more stable and it suitable for measuring the load or power with
large variations.
6. Data upgrade period can be set. User can select a faster upgrade period according to the test needs, so as
to improve the test efficiency.
7. Communication interface supports RS-232 and RS-485. Communication protocol supports SCPI and
Modbus for communicating with computer and PLC.
8. It can freely set the upper and lower limit of current and power, the digital power meter will automatic judge
whether the test value is exceed. Sound and light alarm indication, it is convenient for batch detection to
improve the measurement efficiency.

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2.2 Technical Index
Note: * f represent the frequency of input signal in the below table.
Model
UTE9811+
Display
VA broken code display, 5 digits，four windows
Display Update Rate
0.1S, 0.25S, 0.5S, 1S, 2S, 5S
Measuring Object
V,A,W,PF/HZ/THD/CF
Measuring Mode
AC
Measuring Range of Voltage
3.0V-600V
Voltage Range
75V/150V/300V/600V
Accuracy of Voltage
40Hz≤f≤70Hz：±( 0.4% reading+ 0.1 range+1 character )
Voltage Resolution
0.01V/0.1V
Measuring Range of Current
5.0mA~20.0A
Current Range
200mA/1A/4A/20A
Accuracy of Current
40Hz≤f≤70Hz：±( 0.4% reading+ 0.1 range+1 character )
Current Resolution
0.001A
Switching Range
Auto
Power Range
1W~12kW
Accuracy of Power
40Hz≤f≤70Hz：±( 0.4% reading+ 0.1 range+1 character ）
Power Resolution
0.01W/0.1W/1W
Power Factor Range
-1.000~1.000
Accuracy of Power Factor
±( 0.004 + 0.001* reading +1 character )
Frequency Range
40Hz~70Hz
Accuracy of Frequency
±(0.1% reading +1 character)
Auto Range
Switching
Voltage Range
Increasing
Urms exceeds the measuring range about 110 %( CF < 2 )
Voltage Range
Decreasing
Urms is less than the lower part range about 80 %( CF < 2 )

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Current
Range
Increasing
Irms exceeds the measuring range about 110 %( CF < 2 )
Current
Range
Decreasing
Irms is less than the lower part range about 60 %( CF < 2 )
Harmonic Analysis Times
1~50
Accuracy of Harmonic
±( 0.3% range +5% reading+1 character ）
Pre-heating Time
>30 minutes
Current Peak
The maximum display 24A
Maximum of Allowed Input for
Continuous
Voltage 700V，Current 24A
Maximum of Allowed Input for Instant
1000V, 40A (1 min)
Input Impedance
Voltage about 2 MΩ，Current is less than 0.02Ω
Upper/Lower limit
Four settings for the upper/lower limit of power and current
P Hi (Power high),
P Lo (Power low),
A Hi (Current high),
A Lo (Current low)
Average Function
√
Interface
RS232（DB9 ; 2 pin: TX, 3-pin: RX, 5-pin: GND）
RS485 (DB9 ; 8-pin: A , 9-pin: B )
Baud Rate
4800，9600，19.2K，38.4K，57.6K，115.2K，default 9600.
It follows communication protocol of standard SCPI and Modbus-
RTU.
Display Hold
√
Mute
√
Lock Key
√
Power Source
Input power：AC 100V~240V Frequency 50/60Hz

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Precision Environment
18℃~28℃，30%~75%RH (28℃< operating temperature
<18℃(when in 18℃, it needs to add temperature coefficient)：
reading of 0.05%/℃）
Storage Temperature
-10℃~50℃，non-condensing below 80% RH
Operating Altitude
≤2000 meters
General Characteristic
Color
Gray
Weight
3.2kg
Size
214mm×88mm×340mm
Standard Accessories
Specialized power cable x1；RS232 serial port line X1
Optional Accessories
UTE-L10A 10A three-pronged plug convert banana head plug
connection cable x1
UTE-L16C 16A connection cable with alligator clip x1
UTE-L16A 16A three-pronged plug convert banana head plug
connection cable x1
Standard Packing Quantity
2
Standard Packing Size
400mm*300m*325mm
Gross Weight of Standard Packing
9kg

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2.3 Front Panel
The front panel and function of UTE9811+, as shown in the following figure.
2.3.1 Key function on the front panel
Key Function
Symbol
Description
Power Switch
Press one time to turn “ON”, the power source is enabled, press it again
to turn “OFF”, the power source is disabled.
Left, Right Key
,
Switch sub-menu：Use left, right key to select the sub-menu that need
to be edited.
Number editing: Use left, right key to select the data bit that need to be
edited.
For description, use “←”,“→”to indicate the two keys in the manual.
Up, Down Key
,
Menu editing: Use up, down key to select function item.
Number editing: Use up, down key to increase or decrease the numerical
value.
For description, use “↑”,“↓”to indicate the two keys in the manual.
Decimal Point Key
Number editing: To move decimal point
Display Hold
Data hold key, when the key is activated, it will keep display the current
data.
PF/Hz
To select the fourth line to display power factor or frequency.
TRMS/
Total RMS of
Harmonic
Press this key to enter TRMS display interface, press it again to enter
total RMS of harmonic display interface.
Measurement
value of Harmonic/
Harmonic
Distortion Factor
Press this key to enter harmonic distortion factor display interface,
press it again to enter measurement value of harmonic display interface.

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Setup Key
Enter Setup menu, this menu is to editing the configuration data of
measurement, alarm and communication.
Mute Key
The beeper can be mute when over the limit (mute alarm). Press the key
to activate mute key and the indicator will be illuminated; press it again
to relieve the mute and the indicator will be extinguished.
Crest Factor
To enter crest factor display interface.
Enter or Utility Key
Enter Key: Short press is to activate confirm key to save the currently
edited data.
Utility Key: Long press is to activate Utility key to enter Utility menu.
Lock Key
Press this key and the indicator will be illuminated. Long press to unlock
the key and the indicator will be extinguished.
2.3.2 Display and Symbol
Display and Symbol
Description
Four display windows；
Display measurement data: The display screen can display V (voltage), A
(current), W (power), PF (power factor)/Hz (frequency) and measurement
value of harmonic at the same time.
Menu editing: Display menu
An upgrade symbol of measurement data.
, ,
, ,
Alarm Symbol
OK：Measurement value of the current and power within the upper/lower
limit.
A Hi：Measurement value of current is higher than the upper limit.
A Lo：Measurement value of current is lower than the upper limit.
P Hi：Measurement value of power is higher than the upper limit.
P Lo：Measurement value of power is lower than the upper limit.
The current display data is RMS.
The current display data is the measurement data of harmonic.
The current display data is crest factor.
The current display data is the measurement value of harmonic.
The current display data is the harmonic distortion factor.
It’s a symbol of communication, it represents the upper computer
communicating with power meter.

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2.4 Digital and Character Display
The data display format of data display window is nixie tube. Due to the limitation of the format, special
symbols are needed to represent each character, as shown in the following figure.
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
1
2
3
4
5
6
7
8
9
0
2.5 Rear Panel
The rear panel and function of UTE9811+, as shown in the following figure and table.
No.
Picture of parts
Description
1
Under test load/LOAD terminal, it usually used to connect to the
input port of the product to be test.

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2
Under test input terminal /SOURCE terminal，it usually used to
connect to the output port of AC power.
3
Three-wire power socket and fuse
4
Ground terminal
5
RS232/RS485 communication interface
Chapter 3 Operating Preparation and Measurement
Display
3.1 Operating Preparation
3.1.1 Connecting Power Cable
The operating voltage of the instrument is 100V~240V (50/60Hz), please make sure the power supply is within
the rated voltage of this instrument, and make sure the instrument is well grounded.
Warning: Please make sure that the power supply voltage matches the supply voltage before turning on the
power supply, otherwise the instrument will be burned out.
Notes: The instrument should be used under the recommended working conditions. Never use the
instrument in a place where have flammable or explosive materials, it may cause safety injuries.
3.1.2 Connecting Test Circuit
Please follow the following figure to connect the power and load, and make sure voltage and current is within
the measurement range of the instrument.
Warning:
1. The load current flows along the thick wire in the above diagram, so these wires should have a large
enough safe load capacity.
2. The power supply of the load and the power supply of the instrument should be turned off when wiring

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at the load end.
Notes:
1）When measuring large current/voltage or the current includes high frequency, it should pay attention
to possible mutual interference and noise problems when wiring.
2）The lead wire should as short as possible.
3）Use heavy gauge wire as can as possible when measuring current.
4）To reduce the distributed capacitance to ground, the wire and grounding wire should be as far away
from the instrument housing as possible.
3.1.3 Turn ON/OFF Power Supply
Turn on：Start self-check program when the instrument is enabled, the instrument will enter the measuring
state if the check result is correct.
Turn off：The upper/lower limit of current and power will be saved when the power has been turned off.
Notes：After turn off the power, wait for 5 seconds to turn on again, otherwise the instrument may abnormally
display.
3.1.4 Power-on Measurement
Firstly, plug in the power socket on the rear panel, and use the specified voltage, the power socket should be
with a ground wire. After checking the wiring is connect rightly, turn on the instrument switch located at the
front panel, and the instrument will enter the measurement state. Apply power to the load and read out the
required measurement value from the display on the front panel of the instrument after the load has been
working stably.
Notes: The instrument should be preheated for 30 minutes before entering the stable state. After cutting off
the instrument power, it should wait for more than 5 seconds before powering it on again. It is strictly
forbidden to switch the power on and off repeatedly within a short period of time, which will cause the
instrument life to shorten and may cause instrument failure. When the measurement is finished, turn off the
instrument power and unplug it to prevent possible damage to the instrument caused by lightning strikes.

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3.2 Measurement Display
3.2.1 Window Display
UTE9811+ has four display windows, it can display different measurement value at the same time, as shown
in the following table.
No.
Window Display
Name
Measurement Range
1
V
Voltage (volt）
U: 3.0V～600V
2
A
Current（Ampere/milliampere）
I: 0.0005A～20A
3
W
Active power（Watt）
P: 0.001W～12kW
4
PF
Power factor
PF: -1.000~1.000
Hz
Frequency（Hertz）
Hz: 40Hz～70Hz
The four window display as shown in the following figure.
3.2.2 Alarm for Over Range
These situations will be regarded as over range.
1. The measured value of voltage and current exceeds 120% of the rated range;
2. The peak value of voltage and current exceeds 170% of the rated range；
“--OL-”will be appear when the range is exceeded.
3.2.3 Alarm for the Lower Measured Value
The alarm will be appear if the measured value of voltage is less than 3V or the measured value of current is
less than rated value 0.1%.
1. Voltage, current, power displays “0”.
2. Power factor displays “-----”.
3.2.3 Alarm for Break Off
When switch measurement range and function, “-----”will be appear for a while.

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3.2.4 Alarm for Auto Range Switching
UTE9811+ supports auto range, it can adjust the range according to the size of input signal. The adjustment
interface as shown in the following figure.
Window 2: the current voltage range, “600V”,“300V” , “150V” , “75V”.
Window 4: the currently current range, “20A” , “4A” , “1A” , “0.2A”.
When the instrument is only adjust the voltage range, window 3, 4 will display“-----”.
When the instrument is only adjust the current range, window 1, 2 will display “-----”.
3.2.5 Hold (Data-Hold)
Press Hold key and the indicator will be illuminated, the measurement value will keep display and the data will
not refresh. Press it again, the indicator will be extinguished and the data will be update.
3.2.6 Lock (Lock Key)
To prevent from error operating during measurement, lock key function can set other key be invalid (Lock
state). Press Lock key and the indicator light will be illuminated. This key will be no response. It need to long
press Lock key for 1s and the indicator light will be extinguished. After that, the key will turn to enable state.
3.3 Display Measurement Value
UTE9811+ supports multiple parameter measurement. Press different keys to enter different parameter
measurement interface.
3.3.1 TRMS
After the instrument is boot-up, the instrument will automatic enter TRMS display interface. In other
interface, press【RMS】key to enter TRMS display interface.
Notes: If press【RMS】key multiple times, the system switches between the TRMS display interface and the

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total RMS of harmonic display interface, please select the appropriate interface. The following figure is TRMS
display interface.
Window 1: the measured value of voltage, the unit is V.
Window 2: the measured value of current, the unit is A.
Window 3: the measured value of power, the unit is W.
Window 4: the measured value of power factor (PF) or frequency（Hz）, it can be switch by press【PF/HZ】
key.
3.3.2 Crest Factor
Press【CF】key to enter crest factor display interface, as shown in the following figure.
Window 1: the measured value of voltage crest factor, no unit. The measured value of voltage crest factor=
Voltage crest value/ TRMS Voltage. When no voltage signal is input, it displays "-----".
Window 2: the measured value of current crest factor, no unit. The measured value of current crest factor=
Current crest value/ TRMS Current. When no current signal is input, it displays "-----".
Window 3: the measured value of power, the unit is W.
Window 4: the measured value of power factor (PF) or frequency（Hz）, it can be switch by press【PF/HZ】
key.

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3.3.3 Total RMS of Harmonic
Press【RMS】key to enter the total RMS of harmonic display interface.
Notes: If press【RMS】key multiple times, the system switches between the TRMS display interface and the
total RMS of harmonic display interface, please select the appropriate interface. The following figure is the
total RMS of harmonic display interface.
Window 1: the total RMS voltage (operation value) of 1~50 times，the unit is V.
Window 2: the total RMS current (operation value) of 1~50 times，the unit is A.
Window 3: the total RMS active power (operation value) of 1~50 times, the unit is W.
Window 4 is fixed to display “RMS”.
•When no voltage signal is input or voltage frequency is over the range,
Window 1, 2, 3 displays“-----”.
3.3.4 Measured Value of Harmonic
Press【THD/%】key to enter the measured value of harmonic display interface.
Notes: If press【THD/%】key multiple times, the system switches between the measured value of harmonic
display interface and the harmonic distortion display interface, please select the appropriate interface. The
following figure is the measured value of harmonic display interface.
Window 4 displays “tHD”or “or01”~“or50”. “tHD”represents the total harmonic distortion; “or01”~“or50”
representsthe currently selected harmonic times. The display item of window 4can switch by【↑】or【↓】.

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【↑】or【↓】key supports continuous press function, long press the two keys to quickly switch the display
item.
• When window 4 displays“tHD”,
Window 1: the measured value of the voltage total harmonic distortion，the unit is V.
Window 2: the measured value of the current total harmonic distortion，the unit is A.
Window 3: the total RMS power (operation value) of 1~50 times，the unit is W.
•When window 4 displays“or01”~“or50”,
Window 1: the voltage measured value of the current harmonic times，the unit is V.
Window 2: the current measured value of the current harmonic times，the unit is A.
Window 3: the total RMS power (operation value) of 1~50 times，the unit is W.
•When no voltage signal is input or voltage frequency is over the range,
Window 1, 2, 3 displays“-----”.
•When no current signal is input,
Window 2 displays“-----”.
3.3.5 Harmonic Distortion Factor
Press【THD/%】key to enter harmonic distortion factor display interface.
Notes: If press【THD/%】key multiple times, the system switches between the measured value of harmonic
display interface and the harmonic distortion display interface, please select the appropriate interface. The
following figure is harmonic distortion factor display interface.
Window 4 displays “tHD”or “or01”~“or50”. “tHD”represents the total harmonic distortion; “or01”~“or50”