Uni-t UTM 1231 User Manual [ru]

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UT231

Operating Manual

Digital Power Clamp

Meter

Model UT231

OPERATING MANUAL

Model UT231: OPERATING MANUAL

TABLE OF CONTENTS TITLE PAGE

Overview Unpacking Inspection Safety Information Rules For Safe Operation International Electrical Symbols The Meter Structure A. The Meter Front Structure B. The Meter Back and Bottom Structure Functional Buttons Display Symbols Measurement Operation A. AC Voltage + Frequency Measurement B. AC Current + AC Voltage Measurement C. Active Power + Phase Angle Measurement D. Apparent Power + Reactive Power Measurement E. Power Factor + Phase Angle Measurement F. Active Energy + Time Measurement

G. Temperature

+ Temperature Measurement

True RMS Measurement and Average Value Measurement

3 3 4 4 6 6 6 8 8 11 13 13 15 16 18 19 21 23 24

Model UT231: OPERATING MANUAL

TABLE OF CONTENTS TITLE PAGE

Three Phases Four Wires and Three Phases Three Wires Measurement Method Specifications A. General Specifications B. Environmental Requirements Accuracy Specifications A. AC Voltage B. Frequency C. AC Current D. Active Power E. Apparent Power F. Reactive Power G. Power Factor H. Phase Angle I. Active Energy J. Temperature Maintenance A. General Service B. Replacing the Battery

25 26 26 26 27 27 27 28 28 29 30 31 31 32 32 33 33 34

Model UT231: OPERATING MANUAL

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.

Model UT231 is a digital power clamp meter (hereafter

referred to as “the Meter”) is a handheld intelligent power meter which has both the features of digital current meter and also power measurement meter.

The Meter can measure Voltage, Current, Active Power, Apparent Power, Reactive Power, Power Factor, Phase Angle, Frequency, Active Energy , Temperature and etc.

Unpacking Inspection

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

Item

Description

English Operating Manual

Test Lead

Alligator Clip

Point Contact Temperature Probe

USB Interface Cable

Software

Tool Box

1.5V Battery (LR6)

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

Qty

1 piece 1 pair 1 pair 1 piece 1 piece 1 piece 1 piece 4 pieces

Model UT231: OPERATING MANUAL

Safety Information

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

CAT. III: Distribution level, fixed installation, with smaller transient overvoltages than CAT. IV. CAT IV: Primary supply level, overhead lines, cable systems.

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 6.

Rules For Safe Operation

Warning

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:

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. 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.

Model UT231: OPERATING MANUAL

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. Do not carry out the measurement when the Meter’s back case and / or battery door is opened to avoid electric shock. When the Meter working at an effective voltage over 30V in AC, special care should be taken. Use the proper terminals and function 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. Do not use the Meter if the surface of it is wet or the user’s hands are wet. When using the test leads, keep your fingers behind the finger guards. 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. When opening the battery door, must make sure the Meter is power off. 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. 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.

Model UT231: OPERATING MANUAL

International Electrical Symbols

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

The Meter Structure

A. The Meter Face View (see figure 1)

Brack Red

Figure 1

Model UT231: OPERATING MANUAL

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. Hand Guards: to protect user’s hand from

touching the dangerous area. Power button

Max/ button

MENU button

LOAD button (recall data)

CLEAR button (clear the stored reading)

MIN/ button

Temperature negative Input Terminal

Temperature positive Input Terminal

V: Voltage Input Terminal

COM Input Terminal

MAX/MIN button

CAL: calibration button

SAVE button (data store button)

USB button

LIGHT button (auto display backlight button)

HOLD button

LCD Display

Testing Leads (Red and Black)

Temperature Probe

Model UT231: OPERATING MANUAL

B.The Meter Back and Bottom Structure (see figure 2)

Figure 2 1 Infrared Interface 2 USB Communication Interface Cable

Functional Buttons

Below table indicated for information about the functional button operations.

Button POWER

HOLD

LIGHT

Operation Performed

Press and hold POWER for 1 second to turn the Meter on. Press POWER again to turn the Meter off.

Press HOLD to enter the Hold mode in any mode, beeps. Press HOLD again to exit the Hold mode to return to measurement mode, the Meter beeps and Press LIGHT to turn the display backlight on. The display backlight will be off automatically after 30 seconds.

Press MENU to display the following functions in sequence:

appears and

disappears.

the Meter

Model UT231: OPERATING MANUAL

Button MENU

USB

Operation Performed

AC Voltage (main display) + Frequency (secondary display) AC Current (main display) + AC Voltage (secondary display) Active power (main display) + Phase angle (secondary display) Apparent power (main display) + Reactive power (secondary display) Power factor (main display) + Phase angle (secondary display) Active Energy (main display) + Time (secondary display)

Temperature Temperature Press LOAD once, MR icon shown, the Meter displays the next stored reading, the left secondary display showing the index increase one. Press USB once to turn the USB

(main display) +

(secondary display)

Button

USB

LOAD

CAL

SAVE

Operation Performed

interface on, USB appears and the Meter beeps. Press USB again to turn the USB interface off, USB disappears and the Meter beeps. It is invalid at active energy mode. Press once to enter LOAD mode, MR appears and the Meter beeps. Press again to exit LOAD mode, MR disappears and the Meter beeps. Press and hold LOAD for 1 second to display the stored data quickly.

Calibrating data. It is not recommended to calibrate the meter without authorization.

Press once to store single reading, MEM appears and the Meter beeps. Press and hold for over 1 second to continuous store reading, MEM blinks and the Meter beeps. The index number

Model UT231: OPERATING MANUAL

SAVE

CLEAR

MAX/MIN

Operation PerformedButton

shown on the left secondary display keep on increasing. Press SAVE again to exit. The maximum number of data store is 99, when it achieves 99, the Meter shows FUL. Press CLEAR to clear the stored reading in order to store next reading.

At active energy range, press to reset time the zero, then restart the timing. At all other ranges, press to clear stored readings. Press once at LOAD mode, MR icon shown, the Meter displays the previous stored reading, the left secondary display showing the index decrease one.

Starts recording of maximum and minimum vales. Press to step through maximum (high), minimum (low) and the current AC voltage True RMS value

Operation PerformedButton

MAX/MIN at any mode except at the following ranges:

Power factor (main display) + Phase angle (secondary display) Active Energy (main display) + Time (secondary display)

Temperature Temperature

(main display) +

(secondary display)

Model UT231: OPERATING MANUAL

Display Symbols (see figure 3)

1 2 3 4 5 6

24 23

22 21 20 19

Figure 3

Number

1 2 3 4

7 8

5 6 7

Symbol

USB DC h mm s

Meaning

Data hold is active Data Output is in progress Indicator for DC measurement Unit for hour Unit for minute Unit for second The battery is low.

Warning: To avoid false readings, which could lead to possible electric shock or personal injury, replace the

131415161718

battery as soon as the battery indicator appears.

Hz, PG, KVAr

Symbol of Unit. Hz: Hertz. The unit of frequency . PG: The unit of phase angle KVAr: The unit of reactive power Minimum reading

Model UT231: OPERATING MANUAL

Number

9 10 11 12 13 14 15 16

17 18 19 20

Symbol MIN

MAX TEMP CAL CLR

FREQ

Meaning

Minimum reading Analogue Bar Graph Overloading Ruler Maximum reading Temperature symbol Calibration symbol Indicator for clear the stored reading Ruler negative symbol High voltage symbol Indicates negative reading Indicator for AC voltage or current Indicator for recall the stored reading Frequency symbol

Number

23 24

Symbol MEM FUL

Meaning

Indicator for data store Indicator for data stored is full

Model UT231: OPERATING MANUAL

Measurement Operation

Press and hold POWER for one second to turn the Meter on. The default range is the last measurement range when you turned off the Meter. Replace the battery as soon as the battery indicator “ ” appears on the display.

A. AC Voltage (main display) + Frequency (secondary display) Measurement (see figure 4)

Circuit

Brack Red

Figure 4

Model UT231: OPERATING MANUAL

The AC Voltage ranges are: 15V, 100V, 300V and 600V

The frequency range is: 20Hz~500Hz

Warning

When the voltage input is higher than 30V, the display shows to warn you to take extra care of safety. When the input voltage is higher than 600V (r.m.s.), the display shows OL.

To measure AC voltage + frequency, connect the Meter as follows:

Insert the red test lead into the V terminal and black

1. test lead to the COM input terminal. Press the MENU to select Voltage (main display)

2. + Frequency (secondary display) range and connect the two test leads to the object being measured. The double display shows the AC voltage True

3. RMS value and the frequency value.

Press MAX/MIN once, the LCD displays MAX, it

4. starts recording the maximum AC voltage T rue RMS value. Press MAX/MIN again, the LCD displays MIN, it

5. starts recording the minimum AC voltage True RMS value.

Press MAX/MIN again to show the present AC

6. voltage True RMS value. The display shows OL when the input voltage is

7. higher than 600V (r.m.s).

Note

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

Model UT231: OPERATING MANUAL

B. AC Current (main display) + AC Voltage (secondary display) Measurement (see figure 5)

Figure 5

The AC current ranges are: 40A, 100A, 400A and 1000A

The AC Voltage ranges are: 15V, 100V, 300V and 600V

T o measure AC current + AC voltage, connect the Meter as follows:

Press the MENU to select AC Current (main display) + AC Voltage (secondary display) range.

Press the lever to open the transformer jaw.

Center the tested 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.

The double display shows the AC current True RMS value and AC voltage True RMS value.

Press MAX/MIN once, the LCD displays MAX, it

Model UT231: OPERATING MANUAL

starts recording the maximum AC current T rue RMS value.

Press MAX/MIN again, the LCD displays MIN, it starts recording the minimum AC current True RMS value.

Press MAX/MIN again to show the present AC current True RMS value.

The display shows OL when the current of the tested conductor is higher than 1000A rms.

Note

When the 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.

C. Active Power (main display) + Phase Angle (secondary display) Measurement (see figure 6)

Brack

Red

Figure 6

Model UT231: OPERATING MANUAL

The active power ranges are: 40A, 100A, 400A and 1000A

The phase angle ranges are: 0° ~360°

Warning

To avoid damages to the Meter or harms to you, do you measure higher than AC voltage 600 v.r.s. and AC current 1000A v.r.s.

To measure active power + phase angle, connect the Meter as follows:

Press the MENU to select Active power (main display) + Phase angle (secondary display) range.

Press the lever to open the transformer jaw, and clamp them to the power source or the tested conductor.

Insert the red test lead to V input terminal and black test lead to COM input terminal and connect them to tbe live wire and neutrual wire of the tested circuit.

The double display shows the active power kW value and the PG value of the measured object.

The maximum active power kW measuring range is 600kW, OL will be displayed when it is over than that.

Press MAX/MIN once, the LCD displays MAX, it starts recording the maximum active power value.

Press MAX/MIN again, the LCD displays MIN, it starts recording the minimum active power value.

Press MAX/MIN again to show the present active power value.

Note

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

Model UT231: OPERATING MANUAL

D. Apparent Power (main display) + Reactive Power (secondary display) Measurement (see figure 7)

Brack

Red

Figure 7

Warning

To avoid damages to the Meter or harms to you, do you measure higher than AC voltage 600V rms and AC current 1000A rms.

To test for Apparent power (main display) + Reactive power (secondary display), connect the Meter as follows:

Press the MENU to select Apparent power (main display) + Reactive power (secondary display) range.

Press the lever to open the transformer jaw, and clamp them to the power source or the tested conductor.

Insert the red test lead to V input terminal and black test lead to COM input terminal and connect them to tbe live wire and neutrual wire of the tested circuit.

The double display shows the apparent power kVA value and the reactive power KVAr value of the measured object.

The maximum apparent value kVA and the reactive power KVAr measuring range is 600kVar. OL will be displayed when it is over than that.

Press MAX/MIN once, the LCD displays MAX, it

Model UT231: OPERATING MANUAL

starts recording the maximum apparent power value. Press MAX/MIN again, the LCD displays MIN, it

7. starts recording the minimum apparent power value. Press MAX/MIN again to show the present apparent

8. power value.

Note

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

E. Power Factor (main display) + Phase Angle (secondary display) Measurement (see figure 8)

Brack

Red

Figure 8

Model UT231: OPERATING MANUAL

Warning

To avoid damages to the Meter or harms to you, do you measure higher than AC voltage 600V rms and AC current 1000A rms.

To test for Apparent power (main display) + Reactive power (secondary display), connect the Meter as follows:

Press the MENU to select Power factor (main display) + Phase angle (secondary display) range.

Press the lever to open the transformer jaw, and clamp them to the power source or the tested conductor.

Insert the red test lead to V input terminal and black test lead to COM input terminal and connect them to tbe live wire and neutrual wire of the tested circuit.

The double display shows the power factor value and the phase angle value of the measured object.

When the power factor value is negative, it means the loading is capacItive.

When the power factor value is positive, it means the loading is inductive.

MAX and MIN are not valid when measuring power

factor.

Note

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

Model UT231: OPERATING MANUAL

F. Active Energy (main display) + Time (secondary display) Measurement (see figure 9)

Brack

Red

Figure 9

Warning

To avoid damages to the Meter or harms to you, do you measure higher than AC voltage 600V rms and AC current 1000A rms.

To test for Active Energy (main display) + Time (secondary display), connect the Meter as follows:

Press the MENU to select Power factor (main

1. display) + Phase angle (secondary display) range. Press the lever to open the transformer jaw, and

2. clamp them to the power source or the tested conductor. Insert the red test lead to V input terminal and black

3. test lead to COM input terminal and connect them to tbe live wire and neutrual wire of the tested circuit. The double display shows the active energy value

4. and the measuring time value of the measured object.

The measuring reading gets increasing along with the time increases. Press HOLD to read a particular time kWh value. Then the reading and

time are locked, but still continuous accumulate measuring time. After read the data, press HOLD again to continous measurement. kWh value continous accumulate and the measuring time jumps to the present measuring time. When the measuring time is over 24 hours or the Meter is switched to other measuring ranges, active energy measuring will stop. The maximum readinng of acitve energy is 9999kWh. OL will be displayed when the reading is over than that.

MAX and MIN are not valid when measuring active

5. energy. Press CLEAR to reset the time.

Note

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

Model UT231: OPERATING MANUAL

G. Temperature (main display) and Temperature (secondary display) Measurement (see figure

10)

K type of temperature probe

Figure 10

T o test for temperature (main display) and Temperature

(secondary display), connect the Meter as follows:

Press the MENU to select Power factor (main display) + Phase angle (secondary display) range.

Inser the temperature probe positve to the TEMP+ input terminal and negative to the TEMP – input terminal and connect it to the mesaured object.

The double display shows the present degree celsius value on the main display and the fahrenheit value on the secondardy display.

Note

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

Model UT231: OPERATING MANUAL

True RMS Measurement and Average Value Measurement

The True RMS measurement method can measure accurately the effective value of non-sine wave input signal.

Average value measurement method can measure the mean value of one sine wave input signal, and then displays it as RMS value

When the input waveform has distortion, measuring tolerance will be included. The total tolerance depends on the total distortion. Below table 1 shows the waveform coefficient and the relationship and the requested changing factor of sine wave, square wave, pulse rectangle wave, sawtooth triangle wave, RMS value and average value.

Input Wave PK-PK 0-PK RMS AVG

Sine

sine commute (whole wave)

sine commute (half wave)

square wave

commuted square wave

PK 0

pulse rectangle

sawtooth triangle

PK-PK

D=X/Y

PK-PK

2.828

1.414

2.828

1.800

0.9/D

3.600

1.414

2.828

0.900

1.800

0.9/ D

1.800

1.000

1.414

0.900

1.272

0.9D/2

1.038

0.900

0.9/D

0.900

Model UT231: OPERATING MANUAL

Three Phases Four Wires and Three Phases Three Wires Measurement Method

The Model UT231 digital power clamp meter can measure single phase power and power factor. The power of three phases four wires system can use single phase power measurement method to measure, see figure 7.

If it is a balance load, the total watts is three times of single phase. If it is not a balance load, test each phase power separately, then sum up the three phases power value to obtain the total watt. The apparent power, reactive power, active energy and active power measurement methods are the same.

Power factor value can be obtained directly from each phase power factor testing. Thee phases total power factor is equal to three phases total active power value divided by three phases total apparent power value.

Under three phases three wires balance load situation,

its total watt can be directly by measuring its voltage of the line and current of the line. Connect the loaded two phases to the V and COM input terminal of the power meter, clamp the transformer jaw to the third phase, its total watt is equal to the reading obtained times 1.732.

Three phases total watt also can be obtained by using the specified clamp type three phases digital power meter.

Model UT231: OPERATING MANUAL

Specifications

A. General Specifications

Maximum Voltage between any Terminals and grounding: Refer to different range input protection voltage. Display: Multi LCD displays, Maximum display 9999. Ranges: Auto Overloading: Display OL. Battery Deficiency: Display .

Data Holding: Display Data Logging: Maximum 99, Single or Continuous records Data Recall Maximum and Minimum value display: Voltage, Current, Active Power and Apparent Power ranges Display Backlight: White colour Computer connection: USB Calibration Feature Sleep Mode: To preserve battery life, the Meter automatically turns off if you do not turn press any button for around 15 minutes., except at active

energy range. Analogue Bar Graph Sampling: 3 times per second. Max. Jaw Size: 55mm diameter. Power: 4 x 1.5V battery (LR6) Dimensions: 303mm x 112mm x 39mm Weight: Approximate 601g

B. Environmental Requirements

Altitude: Operating: 2000m Storage: 10000m Temperature and humidity: Operating:

~30 ( 85%R.H) 30 40

Storage:

-10 Safety/ Compliances: IEC 61010 CAT.III 600V, CAT.IV 300V overvoltage and double insulation standard, pollution degree 2. Certification:

~40 ( 75%R.H) ~50 ( 45%R.H)

~+60 ( 85%R.H)

Model UT231: OPERATING MANUAL

Accurate Specifications

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

Operating humidity: 45~75%R.H

A. AC Voltage (True RMS)

Range

15V 100V 300V

B. Frequency

Range 20Hz~500Hz

Resolution

0.1V

Precision 1Hz

Accuracy

(1.2%+5)

Accuracy

(0.5%+5)

Allowable Maximum overload protection voltage

600 RMS

Input Impedance

10M

C. AC Current (True RMS)

Model UT231: OPERATING MANUAL

Range

40A 100A 400A 1000A

D. Active Power (W=V x A x COS Φ)

Voltage / Current

40A Current Range

Precision Defend Rate

Remarks:

Allowable maximum overload protection voltage: 600V RMS Allowable maximum overload protection current: 1000A RMS

100A

400A

1000A

Resolution

0.1A

Accuracy

(2%+5)

15V

0.60kW

1.50kW

6.00kW

15.00kW (3%+5)

100kW:0.01kW 100kW: 0.1kW

100V

4.00kW

10.00kW

40.00kW

100.0kW

Allowable Maximum overload protection current

1000A RMS

Voltage Range

300V

12.00kW

30.00kW

120.0kW

300.0kW

600V

24.00kW

60.00kW

240.0kW

600.0kW

Model UT231: OPERATING MANUAL

E. Apparent Power (VA = V x A)

Voltage / Current

40A Current Range

Accuracy Resolution

Remarks:

Allowable maximum overload protection voltage: 600V RMS Allowable maximum overload protection current: 1000A RMS

100A

400A

1000A

15V

0.60kVA

1.50kVA

6.00kVA

15.00kVA (3%+5)

1000kVA:0.01kVA 100kVA: 0.1kVA

100V

4.00kVA

10.00kVA

40.00kVA

100.0kVA

Voltage Range

300V

12.00kVA

30.00kVA

120.0kVA

300.0kVA

600V

24.00kVA

60.00kVA

240.0kVA

600.0kVA

F. Reactive Power (Var = V x A x SIN Φ)

Model UT231: OPERATING MANUAL

Voltage / Current

40A Current Range

Accuracy Resolution

Remarks:

Allowable maximum overload protection voltage: 600V RMS Allowable maximum overload protection current: 1000A RMS

100A

400A

1000A

15V

0.60kVar

1.50kVar

6.00kVar

15.00kVar (4%+5)

1000kVar: 0.01kVar 100kVar: 0.1kVar

100V

4.00kVar

10.00kVar

40.00kVar

100.0kVar

Voltage Range

300V

12.00kVar

30.00kVar

120.0kVar

300.0kVar

600V

24.00kVar

60.00kVar

240.0kVar

600.0kVar

Model UT231: OPERATING MANUAL

G. Power Factor (PF = W / VA)

Range

0.3~1 (capacitive or inductive)

Accuracy

0.022

For reference only

Resolution

0.001

Remarks:

Allowable maximum overload protection voltage: 600V RMS Allowable maximum overload protection current: 1000A RMS

H. Phase Angle (PG=acos (PF))

Range 0o ~360 0o~360

Accuracy

For reference only

Resolution

Measuring Condition The minimum measuring current 10A The minimum measuring voltage 45V Measuring current less than 10A OR Measuring voltage less than 45V

I. Active Energy (kWh)

Model UT231: OPERATING MANUAL

Range 1~9999kWh

Remarks:

Allowable maximum overload protection voltage: 600V RMS Allowable maximum overload protection current: 1000A RMS

K. Temperature (TEMP)

Range

-50 ~0 0 ~1300

-58 ~32 32 ~2372

Accuracy

(3%+2)

Accuracy

(1%+10) (1%+5) (1%+18) (1%+11)

Resolution

0.001kWh

Resolution 1 1

Model UT231: OPERATING MANUAL

MAINTENANCE

This section provides basic maintenance information including battery replacement instruction.

Warning

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.

A. General Service

Periodically wipe the case with a damp cloth and mild detergent. Do not use abrasives or solvents. T o 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, inflammable and strong magnetic field.

Model UT231: OPERATING MANUAL

B. Replacing the Battery (see figure 11)

Figure 11

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

To replace the battery:.

Press POWER to turn the Meter off and remove all

1. the connections from the input terminals Turn the Meter’s front case down.

2. Remove the screw from the battery door, and separate

3. the battery door from the case bottom. Take out the old battery and replace with 4 x 1.5V

4. battery (LR6). Rejoin the case bottom and the battery compartment,

5. and reinstall the screw.

Model UT231: OPERATING MANUAL

*END*

This operating manual is subject to change without notice.

Model UT231: OPERATING MANUAL

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: (852) 2950 9168 Fax: (852) 2950 9303 Email: info@uni-trend.com http://www.uni-trend.com

Uni-t UTM 1231 User Manual [ru]

Specifications and Main Features

Frequently Asked Questions

User Manual