UNI-T UT61B True RMS Digital Multimeter User Manual

UNI-T UT61B True RMS Digital Multimeter

Product Information

Specifications:

• Model: UT61+ Series
• Maximum Voltage: 1000V True RMS
• Compliance: CAT III 1000V, CAT IV 600V, Pollution Degree 2

Product Usage Instructions

I. Overview

Ensure you have read the manual thoroughly for safe and correct usage of the UT61+ Series Digital Multimeter.

II. Accessories

Open the package box and check for the following items: meter, test leads, batteries, manual. Contact supplier if any item is missing or damaged.

III. Safety Instructions

1. Check for any damaged components before use.
2. Ensure rear and battery covers are intact to avoid shock hazard.
3. Replace damaged test leads with same model or specifications.
4. Avoid touching exposed wires or circuits during measurement.
5. Exercise caution with voltages above AC 30Vrms or DC 60V.
6. Operate the meter at maximum range if value range is unknown.
7. Adhere to rated voltage and current limits.
8. Set function dial correctly before measurement.
9. Switch off circuit power and discharge capacitors before measuring resistance, diode, etc.
10. Check fuses before measuring current.
11. Avoid extreme environmental conditions.
12. Do not alter internal circuit to prevent damage.
13. Replace batteries promptly when low battery indicator is displayed.
14. Turn off the meter after use.

Frequently Asked Questions

• Q: What should I do if the meter displays an error message?
  • A: If an error message is displayed, refer to the manual for troubleshooting steps. If the issue persists, contact customer support.
• Q: Can the meter be used to measure temperature?
  • A: The UT61+ Series Digital Multimeter does not support temperature measurement. It is designed for voltage, current, resistance, and other electrical measurements only.

P/N:110401109614X
UT61+ Series 1000V True RMS Digital Multimeter
User Manual

Preface
Thank you for purchasing this brand new 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.
Limited Warranty and Liability
Uni-Trend guarantees that the product is free from any defect in material and workmanship within one year from the purchase date. This warranty does not apply to damage caused by accident, negligence, misuse, modification, contamination or mishandling. The dealer shall not be entitled to give any other warranty on behalf of Uni-Trend. If you need warranty service within the warranty period, please contact your seller directly.
Uni-Trend will not be responsible for any special, indirect, incidental or subsequent damage or loss caused by using this device.

Overview

The UT61B+/UT61D+/UT61E+ is a handheld true RMS digital multimeter with high reliability and security (UT61B+/UT61D+: 6000 counts; UT61E+: 22000 counts). With large screen, high resolution analog pointer display, full scale overload protection, and unique appearance design, it becomes a new practical electrical measuring meter. The meter can measure AC/DC voltage/current, resistance, diode, transistor hFE (UT61E+), continuity, capacitance, frequency, duty ratio, temperature (UT61D+), etc. Featuring data transmission, data hold, relative value measurement, peak measurement (UT61D+/UT61E+), internal temperature alarm, low battery indication, backlight, auto power off, and NCV functions, the meter is an ideal measuring tool for many application fields.

Accessories

Open the package box and take out the meter. Please double check whether the following items are missing or damaged.
1. User manual —————————————————- 1 pc 2. Test leads —————————————————— 1 pair 3. Adapter socket (UT61E+) ———————————— 1 pc 4. K-type thermocouple (UT61D+) —————————- 1 pc 5. USB cable ——————————————————– 1 pc 6. Download operation guide ———————————– 1 pc 7. 1.5V AAA batteries ——————————————– 4 pcs
If any of the above is missing or damaged, please contact your supplier immediately.

Safety Instructions

The meter is designed and manufactured according to IEC61010-1 safety standard, and conforms to CAT III 1000V, CAT IV 600V, and pollution degree 2. If the meter is used in a manner not specified by the manufacturer, the protection provided by the meter may be impaired.
1. Before use, please check if there is any item which is damaged or behaving abnormally. If any abnormal item (such as bare test lead, damaged meter casing, broken LCD, etc.) is found, please do not use the meter.
2. Do not use the meter if the rear cover or the battery cover is not completely covered up, or it may pose a shock hazard!
3. Damaged test leads must be replaced with ones of the same model or same electrical specifications.
4. During measurement, do not touch any exposed wires, connectors, unused inputs or circuits being measured.
5. Use caution when working with voltages above AC 30Vrms, 42Vpeak or DC 60V. Keep fingers behind the finger guards of the test leads to prevent electric shock.
6. If the range of the measured value cannot be determined, the meter must be operated at the maximum range.
7. Do not apply more than the rated voltage or current marked on the meter between the terminals or between any terminal and earth ground.
8. Place the function dial in the correct position before measurement. 9. Before measuring resistance, diode, continuity, or capacitance, switch off the
power supply of the circuit, and fully discharge all capacitors. 10.Before measuring current, make sure the fuses are intact. 11.Do not use or store the meter in high temperature, high humidity, flammable,
explosive, or strong magnetic field environments. 12.Do not change the internal circuit of the meter to avoid damage to the meter
or user! 13.When ” ” is displayed, please replace the batteries in time to ensure
measurement accuracy. 14.Turn off the meter in time after measurement. If the meter is not in use for a
long time, please remove the batteries.

IV. Electrical Symbols

Symbol Description Warning or Caution Caution, possibility of electric shock Both direct and alternating current

Equipment protected throughout by DOUBLE INSULATION or REINFORCED INSULATION
Earth (ground) Terminal

CAT III

It is applicable to testing and measuring circuits connected to the distribution part of the building’s low-voltage MAINS installation.

CAT IV

It is applicable to testing and measuring circuits connected at the source of the building’s low-voltage MAINS installation.

V. External Structure (Picture 1)
1. NCV detector 2. Indicator light 3. LCD display 4. Function buttons 5. Function dial 6. Input terminals 7. USB (Bluetooth) access port 8. Test lead slots 9. Nut for external holder 10.Battery compartment fixing screw 11.Tilt stand
FUSED 250V max MAX 10sec EACH 15min
Picture 1

VI. LCD Display (Picture 2, Picture 3)

Picture 2 UT61B+/UT61D+

Picture 3 UT61E+

Symbol
AC/DC
, k, M mV, V
A, mA, A nF, F, mF
Hz, %
NCV P-MAX/P-MIN
MAX/MIN °C/°F LoZ hFE TRMS

Description Measured voltage is >30V (AC or DC) Data hold Negative reading AC/DC measurement Low battery indication Auto range Diode test Continuity test Relative value measurement Resistance units: ohm, kilohm, megaohm Voltage units: millivolt, volt Current units: microampere, milliampere, ampere Capacitance units: nanofarad, microfarad, millifarad Frequency, duty ratio Data transmission Transistor magnification (UT61E+) Non-contact voltage detection Peak measurement (UT61D+/UT61E+) Maximum/Minimum measurement Celsius/Fahrenheit (UT61D+) Low impedance measurement (UT61D+) Transistor magnification measurement (UT61E+) Auto power off True RMS

Function Dial and Function Buttons

1. Function Dial

Dial Position

Power off

Description

AC voltage measurement/Low pass filter measurement/ Frequency and duty ratio measurement (UT61E+)

DC voltage measurement/AC+DC measurement (UT61E+)
AC voltage measurement/Frequency and duty ratio measurement (UT61B+)
AC/DC voltage measurement/Frequency and duty ratio measurement (UT61D+)
AC/DC millivolt voltage measurement/Frequency and duty ratio measurement
Diode test/Continuity test/Resistance measurement/ Capacitance measurement (UT61D+/UT61E+)
Continuity test/Resistance measurement (UT61B+)
Diode test/Capacitance measurement (UT61B+)
Transistor magnification measurement (UT61E+)
Frequency and duty ratio measurement
AC/DC microampere current measurement/ Frequency and duty ratio measurement
AC/DC milliampere current measurement/ Frequency and duty ratio measurement
AC/DC ampere current measurement/Frequency and duty ratio measurement
Non-contact voltage detection

Function Buttons

Short press: Press a button for less than 2s. Long press: Press a button for more than 2s.

Button

Short press to switch between functions in each compound function position.

Button

Short press to enter the manual range mode and change the range. Long press to exit the manual range mode.

3. USB Button
   Short press to switch between frequency and duty ratio measurement. Long press to turn on/off data communication (note: only available when USB communication module is inserted into the casing).

Button

Short press to enter/exit the relative value measurement mode.

5. Button PEAK MAX MIN
   Short press to cycle through the measured maximum and minimum. Long press to cycle through the peak maximum and peak minimum (UT61D+/UT61E+).

Button

Short press to cycle through the measured maximum and minimum (UT61B+).

Button

Short press to hold the measurement on the display and ” Short press again to cancel data hold. Long press to turn on/off the backlight.

” will be displayed.

Operating Instructions

Please check the internal batteries first. If ” ” is displayed, replace the batteries in time. Please also pay attention to the warning sign ” ” beside the input terminals, which indicates that the measured voltage or current must not exceed the values marked on the meter.
1. AC Voltage Measurement (Picture 4)

Before each use, verify meter operation by measuring a known voltage. The input impedance of the meter is about 10M. This load effect may cause measurement errors in high-impedance circuits. In most cases, if the impedance of the circuit is below 10k, the error can be ignored (0.1%).
2. DC Voltage Measurement (Picture 5)

Picture 4

1. Insert the red test lead into the

or

terminal, and black test lead

into the COM terminal.

2. Turn the function dial to the , , or position.

3. Short press the SELECT button to switch to AC voltage measurement or LPF

ACV measurement (UT61E+, manual maximum range by default) if required.

4. Connect the test leads with the measured load or power supply in parallel.

5. Read the voltage value on the display (if the voltage is >1000V, the red indicator

light will be on and the buzzer will sound an alarm).

6. Short press the button to display the frequency/duty ratio of the measured

voltage.

Caution: Do not input a voltage over 1000V or it may damage the meter. Be cautious to avoid electric shock when measuring high voltages. After completing the measurement, disconnect the test leads from the circuit under test.

Picture 5

DC Voltage Measurement

1. Insert the red test lead into the

or

terminal, and black test lead

into the COM terminal.

2. Turn the function dial to the , , or position.

3. Short press the SELECT button to switch to DC voltage measurement if

required.

4. Connect the test leads with the measured load or power supply in parallel.

5. Read the voltage value on the display (if the voltage is >1000V, the red indicator

light will be on and the buzzer will sound an alarm).

AC+DC Voltage Measurement (UT61E+)

1. Insert the red test lead into the

terminal, and black test lead into the

COM terminal.

2. Turn the function dial to the position.

3. Short press the SELECT button to switch to AC+DC voltage measurement.

4. Connect the test leads with the measured load or power supply in parallel.

5. Read the voltage values on the display. The AC and DC voltages are displayed

alternately.

3. AC/DC Millivolt Voltage Measurement (Picture 6)

Picture 6

1. Insert the red test lead into the

or

terminal, and black test lead

into the COM terminal.

2. Turn the function dial to the

position.

3. Short press the SELECT button to switch to AC/DC millivolt voltage measurement

if required.

4. Connect the test leads with the measured load or power supply in parallel.

5. Read the voltage value on the display.

6. When measuring AC millivolt voltage, short press the

button to display

the frequency/duty ratio of the measured voltage.

Caution:
Do not input a voltage over 1000V or it may damage the meter. Be cautious to avoid electric shock when measuring high voltages. After completing the measurement, disconnect the test leads from the circuit under test. Before each use, verify meter operation by measuring a known voltage. The input impedance of the AC mV range is about 10M. This load effect may cause measurement errors in high-impedance circuits. In most cases, if the impedance of the circuit is below 10k, the error can be ignored (0.1%).

The input impedance of the DC mV range is infinite (about 1G), and it does not attenuate when measuring weak signals, so the measurement accuracy is high. When the test leads are open, there may be a value on the screen, but this is normal and will not affect the measuring result. Frequency measurement at 60mV range (AC voltage) is for reference only (UT61B+/UT61D+).
4. LoZ (low impedance) ACV Measurement (UT61D+, Picture 7)

Picture 7

1. Insert the red test lead into the

terminal, and black test lead into the

COM terminal.

2. Turn the function dial to the

position.

3. Connect the test leads with the measured load or power supply in parallel.

4. Read the voltage value on the display.

5. Short press the button to display the frequency/duty ratio of the measured

voltage.

Caution:
Do not input a voltage over 1000V or it may damage the meter. Be cautious to avoid electric shock when measuring high voltages. After completing the measurement, disconnect the test leads from the circuit under test. Before each use, verify meter operation by measuring a known voltage. After using the LoZ function, wait 3 minutes before next operation. LoZ ACV measurement eliminates ghost voltage for more accurate measurement.

5. Resistance Measurement (Picture 8)

6. Continuity Test (Picture 9)

Picture 8

1. Insert the red test lead into the

or

terminal, and black test lead

into the COM terminal.

2. Turn the function dial to the

or position.

3. Touch the probes to the test points in the circuit.

4. Read the resistance value on the display.

Caution:
Use caution when working with voltages above AC 30Vrms, 42Vpeak or DC 60V. Such voltages pose a shock hazard. If the measured resistor is open or the resistance exceeds the maximum range, the LCD will display “OL”. Before measuring resistance, switch off the power supply of the circuit, and fully discharge all capacitors. When measuring low resistance, the test leads will produce 0.1~0.3 measurement error. To obtain accurate measurement, short- circuit the test leads and use the relative value measurement (REL) mode. If the resistance is not less than 0.5 when the test leads are short-circuited, please check if the test leads are loose or abnormal. When measuring high resistance, it is normal to take a few seconds to stabilize the reading.

Picture 9

1. Insert the red test lead into the

or

terminal, and black test lead

into the COM terminal.

2. Turn the function dial to the

or

position.

3. Short press the SELECT button to switch to continuity test.

4. Touch the probes to the test points in the circuit.

5. Measured resistance <50: The circuit is in good conduction status;

the buzzer beeps continuously and the green indicator light is on.

Caution:
Use caution when working with voltages above AC 30Vrms, 42Vpeak or DC 60V. Such voltages pose a shock hazard. Before testing continuity, switch off the power supply of the circuit, and fully discharge all capacitors.

7. Diode Test (Picture 10)

8. Capacitance Measurement (Picture 11)

Picture 10

1. Insert the red test lead into the

or

terminal, and black test lead

into the COM terminal.

2. Turn the function dial to the

or position.

3. Short press the SELECT button to switch to diode test if required.

4. Connect the red probe with the diode anode, and black probe with the diode

cathode.

5. Read the forward bias value on the display.

6. Measured value <0.12V: The diode may be damaged; the red indicator light

is on.

Measured value within 0.12V~2V: The diode is normal; the green indicator

light is on (for reference only).

7. If the diode is open or its polarity is reversed, the LCD will display “OL”. For

silicon PN junction, the normal value is generally about 500~800 mV.

Caution:
Use caution when working with voltages above AC 30Vrms, 42Vpeak or DC 60V. Such voltages pose a shock hazard. Before testing the diode, switch off the power supply of the circuit, and fully discharge all capacitors.

Picture 11

1. Insert the red test lead into the

or

terminal, and black test lead

into the COM terminal.

2. Turn the function dial to the

or position.

3. Short press the SELECT button to switch to capacitance measurement.

4. Touch the probes to the capacitor pins.

5. Read the capacitance value on the display after it gets steady.

Caution:
Use caution when working with voltages above AC 30Vrms, 42Vpeak or DC 60V. Such voltages pose a shock hazard. Before measuring, fully discharge all capacitors (especially high-voltage capacitors) to avoid damage to the meter and user. If the measured capacitor is short-circuited or the capacitance exceeds the maximum range, the LCD will display “OL”. When measuring high capacitance, it is normal to take a few seconds to stabilize the reading. For small capacitance measurement, the REL mode should be used to avoid the influence coming from distributed capacitance so as to obtain the correct reading.

9. Transistor Magnification (hFE) Measu rement (UT61E+, Picture 12)

10. Frequency/Duty Ratio Measurement (Picture 13)

NPN
Picture 12

1. Turn the function dial to the hFE position. 2) Insert the adapter socket into the input terminals. 3) Insert the three pins of the transistor under test into the corresponding holes
   of the adapter socket. 4) Read the magnification of the measured transistor.

Picture 13

1. Insert the red test lead into the

or

terminal, and black test lead

into the COM terminal.

2. Turn the function dial to the

position.

3. Short press the

button to switch to frequency/duty ratio measurement

if required.

4. Read the frequency/duty ratio value on the display.

Caution:
Use caution when working with voltages above AC 30Vrms, 42Vpeak or DC 60V. Such voltages pose a shock hazard.

11. Temperature Measurement (UT61D+, Picture 14)

Digital Multimeter-HVAC USB

A FUSED 250V max MAX 10sec
EACH 15min

Picture 14

1. Turn the function dial to the °C°F position.

2. Insert the K-type thermocouple into the

and COM terminals, observing

correct polarity.

3. Bring the temperature sensing end of the thermocouple close to the object

surface under test.

4. Read the Celsius temperature value on the display after it gets steady.

5. Short press the SELECT button to switch between °C and °F.

Caution: Only K-type thermocouple is applicable. The LCD displays “OL” when the meter is turned on. The measured temperature should be less than 230°C/446°F (°F = °C × 1.8 + 32)

21

12. AC/DC Current Measurement (Picture 15)
AC/DC
RL
RL
Picture 15 1) Insert the red test lead into the mA/A or A terminal, and black test lead into
the COM terminal. 2) Turn the function dial to the , , or position. 3) Short press the SELECT button to switch to AC/DC current measurement if
required. 4) Connect the test leads with the measured load or power supply in series. 5) Read the current value on the display (if the current is >10A, the red indicator
light will be on and the buzzer will sound an alarm). 6) When measuring AC current, short press the button to display the
frequency/duty ratio of the measured current. Caution:
To prevent possible electric shock, fire, or personal injury, switch off the power supply of the circuit, and then connect the meter with the circuit in series before measuring the current. If the range of the measured current is unknown, select the maximum range and then accordingly reduce. There are fuses inside mA/A and A input terminals. Do not connect the test leads with any circuit in parallel. When the measured current is >5A, each measurement time should be 10s and the rest interval should be 15 minutes. When the temperature in the meter is 75°C after measurement of large current, the yellow indicator light will be on, the buzzer will beep, and the LCD will display “CUT”. When the temperature drops to <40°C, the yellow indicator light will be off, and the measurement can be made.
22

13. Non-Contact Voltage (NCV) Detection (Picture 16)

14. USB Data Transmission (Picture 17a, Picture 17b)

FUSED 250V max MAX 10sec EACH 15min
Picture 16 1) Turn the function dial to the NCV position. 2) Bring the NCV detector (top left corner of the meter) close to the wire (AC)
under test. 3) If the voltage of the wire is 50Vrms (frequency: 50Hz/60Hz), the red indicator
light will be on and the buzzer will beep. If no voltage is detected, the LCD will display “EF”. As the intensity of the detected voltage increases, more segments “-” will be displayed, and the frequency for buzzer beeping and red indicator light flashing will be higher.
Caution: The detected voltage level varies with the distance between the NCV detector and the wire under test. The detected voltage level is for reference only, not for specific measurement. The frequency of the detected voltage should be 50Hz/60Hz. Hold the meter casing for non-contact voltage detection.
23

Picture 17a

Picture 17b

1. Pull out the USB sealing cover at the back of the meter (Picture 17a). 2) Insert the USB communication module into the USB access port of the meter
   and the LCD will display ” ” (Picture 17b). 3) If USB data transmission is not needed during measurement, long press the
   button or pull out the USB module to disable data transmission, and ” ” will disappear.
2. To recover this function, long press the button or insert the USB module.
3. The USB communication software can be downloaded from the official website
   of Uni-Trend (www.uni-trend.com).

15. Others

1. Auto power off: During measurement, if there is no operation for 15 minutes, the meter will automatically shut down to save power; before the automatic shutdown, the buzzer will beep for warning. Users can wake the meter up by pressing the SELECT button. To disable the auto-off function, press and hold the SELECT button in the off state, and then turn on the meter. To recover the function, restart the meter.
2. Buzzer alarm during measurement: When the input voltage >1000V or current

   10A, the buzzer will sound an alarm.

3. Low battery indication: When the battery voltage is 4.6V ±0.2V, ” ” will be displayed.

24

Specifications

1. General Specifications

1. Max voltage between the input terminal and COM terminal: Please refer to the description of input protection voltage for each range.
2. mA/A input terminal protection: 1A 240V fast-acting fuse, 6x25mm 3) A input terminal protection: 10A 240V fast-acting fuse, 6x25mm 4) Max display: 6000 (UT61B+/UT61D+), 22000 (UT61E+)
   Analog bar: 31 segments (UT61B+/UT61D+), 46 segments (UT61E+) (conversion rate: 30 times/s). 5) Refresh rate: 2~3 times/s 6) Range: Auto/Manual 7) Polarity display: Auto 8) Over-range Indication: OL 9) Low battery indication: ” ” is displayed. 10) Operating temperature: 0°C~40°C (32°F~104°F) 11) Storage temperature: -10°C~50°C (14°F ~122°F) 12) Relative humidity: 75% at 0°C~30°C; 50% at 30°C~40°C 13) Operating altitude: 2000m 14) Electromagnetic compatibility: Conforms to EN61326-1:2006 and
   EN61326-2-2:2006 standards 15) Battery: 4×1.5V AAA 16) Dimensions: 186mm×89mm×49mm 17) Weight: 400g 18) Safety standard: IEC 61010-1: CAT III 1000V/CAT IV 600V 19) Pollution degree: 2 20) Information of usage: Indoor and outdoor
   25

2. Electrical Specifications
Accuracy: ± (a% of reading + b digits), 1 year warranty Ambient temperature: 23°C ± 5°C (73.4°F ± 9°F) Relative humidity: 75%

Caution: To ensure measurement accuracy, the operating temperature should be within
18°C~28°C and the fluctuation range should be within ±1°C. When the temperature
is <18°C or >28°C, add temperature coefficient error: 0.1 x (specified accuracy)/ °C.

1. DC Voltage

Range 220.00mV 2.2000V 22.000V 220.00V 1000.0V

UT61E+ Resolution
0.01mV 0.1mV 1mV 10mV 0.1V

Accuracy ± (0.1%+5)
± (0.05%+5)
± (0.1%+5)

Range 60.00mV 600.0mV 6.000V 60.00V 600.0V
1000V

UT61B+/UT61D+ Resolution 0.01mV 0.1mV 0.001V 0.01V 0.1V 1V

Accuracy ± (0.8%+5) ± (0.8%+3) ± (0.5%+3)
± (0.5%+3)
± (1.0%+3)

Input impedance: About 1G for mV range, about 10M for other ranges Accuracy guarantee: 1%~100% of range; short circuit allows least significant digit 5 Max input voltage: 1000V (if the voltage is >1000V, the red indicator light will be on and the buzzer will sound an alarm; if the voltage is >1010V , the LCD will display “OL”) Overload protection: 1000V
26

2. AC Voltage

Range 220.00mV

Resolution 0.01mV

2.2000V

0.1mV

22.000V

1mV

220.00V

10mV

1000.0V

0.1V

UT61E+ Frequency response
40Hz~1kHz 1kHz~10kHz 40Hz~1kHz 1kHz~10kHz 40Hz~100Hz (LPF)
40Hz~1kHz 1kHz~10kHz 40Hz~100Hz (LPF)
40Hz~1kHz 1kHz~10kHz 40Hz~100Hz (LPF)
40Hz~1kHz 1kHz~10kHz 40Hz~100Hz (LPF)

Accuracy ± (1.0%+10) ± (1.5%+30) ± (0.8%+10) ± (1.2%+50) ± (1.2%+50) ± (0.8%+10) ± (1.2%+50) ± (1.8%+50) ± (0.8%+10) ± (2.0%+50) ± (2.0%+50) ± (1.2%+10)
± (3.0%+50)

Range
60.00mV 600.0mV 6.000V 60.00V 600.0V
1000V LoZ ACV 600.0V (UT61D+) LoZ ACV 1000V (UT61D+)

UT61B+/UT61D+ Resolution 0.01mV 0.1mV 0.001V 0.01V 0.1V 1V 0.1V 1V

Accuracy ± (1.2%+5) ± (1.2%+5) ± (1.0%+3) ± (1.0%+3) ± (1.0%+3) ± (1.2%+5) ± (2.0%+5) ± (2.0%+5)

Input impedance: About 10M Display: True RMS Frequency response: 40Hz~500Hz (UT61B+), 40Hz~1kHz (UT61D+), 40Hz~10kHz (UT61E+) The AC crest factor can be 3.0 at 3000 counts, and can only be 1.5 at 6000 counts. The additional error should be added according to the crest factor of a non-sinusoidal wave as follows (UT61B+/UT61D+):
27

a) Add 4% when crest factor is 1~2 b) Add 5% when crest factor is 2~2.5 c) Add 7% when crest factor is 2.5~3
The AC crest factor can be 2.0 at 10000 counts, and can only be 1 at 22000 counts. The additional error should be added according to the crest factor of a non-sinusoidal wave as follows (UT61E+): a) Add 4% when crest factor is 1~2 b) Add 5% when crest factor is 2~2.5 c) Add 7% when crest factor is 2.5~3 Frequency measurement range: 40Hz~500Hz (UT61B+), 40Hz~1kHz (UT61D+), 40Hz~10kHz (UT61E+); input amplitude: 10% of voltage range Duty ratio is for reference only. Accuracy guarantee (UT61B+/UT61D+): 2%~100% of 60mV range, 1%~100% of other ranges; short circuit allows least significant digit 3 Accuracy guarantee (UT61E+): 1%~100% of range at 40Hz~1kHz, 10%~100% of range at 1kHz~10kHz; short circuit allows least significant digit 10 Max input voltage: 1000V (if the voltage is >1000V, the red indicator light will be on and the buzzer will sound an alarm; if the voltage is >1010V, the LCD will display “OL”) Overload protection: 1000V

3. AC+DC Voltage (UT61E+)

Range 2.2000V 22.000V 220.00V 1000.0V

UT61E+

Resolution

Frequency response

0.1mV

40Hz~500Hz

1mV

40Hz~500Hz

10mV

40Hz~500Hz

0.1V

40Hz~500Hz

Accuracy ± (1.8%+70) ± (1.8%+70) ± (1.8%+70) ± (4.0%+70)

AC voltage display: True RMS Input impedance: About 10M Accuracy guarantee: 10%~100% of range For AC voltage, short circuit allows least significant digit 200 Overload protection: 1000V
28

4. Resistance
   Range 220.00 2.2000k 22.000k 220.00k 2.2000M 22.000M 220.00M

UT61E+ Resolution
0.01 0.1 1 10 100 1k 10k

Accuracy
± (0.5+10)
± (0.8+10) ± (1.5%+10) ± (3.0%+50)

Range 600.0 6.000k 60.00k 600.0k 6.000M 60.00M

UT61B+/UT61D+ Resolution 0.1 1 10 100 1k 10k

Accuracy ± (1.2%+2)
± (1.0%+2)
± (1.2%+2) ± (2.0%+5)

Measurement result = displayed value ­ resistance of shorted test leads Open circuit voltage: About 1V Accuracy guarantee: 1%~100% of range Overload protection: 1000V

29

5. Continuity and Diode

Range

Resolution 0.1

UT61B+/UT61D+/UT61E+
Remarks
Broken circuit: Resistance 70, no beep Well-connected circuit: Resistance <50, audio/visual alarm

0.001V

Open circuit voltage: About 3V For normal diodes, the buzzer will beep once. For short circuit, the buzzer will beep for a long time.

Overload protection: 1000V When the forward voltage drop is within 0.12V~2V, the buzzer will beep once. When the forward voltage drop is <0.12V, the buzzer will beep for a long time.

6. Transistor Magnification (UT61E+)

Range 1000

Resolution 1

UT61E+ Remarks
Ib0: About 1.8A; Vce: About 2.5V

The displayed value of the transistor magnification is for reference only.

7. Capacitance
   Range 22.000nF 220.00nF 2.2000F 22.000F 220.00F 2.2000mF 22.000mF 220.00mF

UT61E+ Resolution
1pF 10pF 100pF 1nF 10nF 100nF 1F 10F

Accuracy
± (3.0%+5)
± (4.0%+5) ± (10%+5) ± (20%+5)
30

Range 60.00nF 600.0nF 6.000F 60.00F 600.0F 6.000mF 60.00mF

UT61B+/UT61D+ Resolution 10pF 100pF 1nF 10nF 100nF 1F 10F

Accuracy ± (3%+5) ± (10%+5)

Overload protection: 1000V Measurement result = displayed value ­ capacitance of open-circuit test leads For capacitance 1F (UT61B+/UT61D+) and 22nF (UT61E+), it is recommended to use the REL mode to deduct the open circuit reading. Accuracy guarantee: 1%~100% of range For ranges of 2.2F and below, when the accuracy is 3%, 10 digits should be added (UT61E+). For ranges of 60mF (UT61B+/UT61D+) and 220mF (UT61E+), the measurement time is about 20s.

8. Temperature

Range

-40~0°C

-40~1000°C

0~300°C 300~1000°C

-40~32°F

-40~1832°F

32~572°F

572~1832°F

Resolution 0.1°C~1°C
0.2°F~2°F

Accuracy ± (1.0%+3°C) ± (1.0%+2°C) ± (1.0%+3°C) ± (1.0%+6°F) ± (1.0%+4°F) ± (1.0%+6°F)

The measured temperature should be less than 230°C/446°F.
31

9. DC Current
   Range 220.00A 2200.0A 22.000mA 220.00mA 20.000A

UT61E+ Resolution
0.01A 0.1A 1A 10A 1mA

Accuracy ± (0.5%+10) ± (1.2%+50)

Range 600.0A 6000A 60.00mA 600.0mA 6.000A 10.00A (UT61B+) 20.00A (UT61D+)

UT61B+/UT61D+ Resolution 0.1A 1A 10A 0.1mA 1mA 10mA 10mA

Accuracy ± (1.0%+2) ± (1.0%+3)
± (1.2%+5)

Overload protection: mA/A range: F1 Fuse 1A 240V 6x25mm A range: F2 Fuse 10A 240V 6x25mm Open circuit allows least significant digit 5 (UT61B+/UT61D+) and 10 (UT61E+). Accuracy guarantee: 1%~100% of range

32

10. AC Current

Range 220A 2200A 22mA 220mA
20A

Resolution 0.01A 0.1A 1A 10A 1mA

UT61E+ Frequency response
40Hz~1kHz 1kHz~10kHz 40Hz~1kHz 1kHz~10kHz 40Hz~1kHz 1kHz~10kHz 40Hz~1kHz 1kHz~10kHz 40Hz~1kHz 1kHz~10kHz

Accuracy ± (0.8%+10) ± (3%+50) ± (0.8%+10) ± (3%+50) ± (1.2%+10) ± (3%+50) ± (1.2%+10) ± (3%+50) ± (1.2%+10) ± (3%+50)

Range 600.0A 6000A 60.00mA 600.0mA 6.000A 10.00A (UT61B+) 20.00A (UT61D+)

UT61B+/UT61D+ Resolution
0.1A 1A 10A 0.1mA 1mA 10mA 10mA

Accuracy ± (1.2%+5) ± (1.5%+5)
± (2.0%+5)

Display: True RMS Frequency response: 40Hz~500Hz (UT61B+), 40Hz~1kHz (UT61D+), 40Hz~10kHz (UT61E+) Accuracy guarantee (UT61B+/UT61D+): 5%~100% of 600.0A range, 1%~100% of other ranges; open circuit allows least significant digit 5 Accuracy guarantee (UT61E+): 1%~100% of range at 40Hz~1kHz, 10%~100% of range at 1kHz~10kHz (the minimum measured current at A ranges is 30A); open circuit allows least significant digit 10 The AC crest factor can be 3.0 at 3000 counts, and can only be 1.5 at 6000 counts. The additional error should be added according to the crest factor of a non-sinusoidal wave as follows (UT61B+/UT61D+):
33

a) Add 4% when crest factor is 1~2 b) Add 5% when crest factor is 2~2.5 c) Add 7% when crest factor is 2.5~3
The AC crest factor can be 2.0 at 10000 counts, and can only be 1 at 22000 counts. The additional error should be added according to the crest factor of a non-sinusoidal wave as follows (UT61E+): a) Add 4% when crest factor is 1~2 b) Add 5% when crest factor is 2~2.5 c) Add 7% when crest factor is 2.5~3 Frequency measurement range: 40Hz~500Hz (UT61B+), 40Hz~1kHz (UT61D+), 40Hz~10kHz (UT61E+); input amplitude: 50% of current range. Duty ratio is for reference only. Frequency accuracy: ± (0.1%+4); resolution: 0.1Hz (UT61B+/UT61D+) Overload protection: Same as that for DC current

11. Frequency/Duty Ratio

Range 10Hz~220MHZ
0.1%~99.9%

UT61E+ Resolution 0.01Hz~0.01MHz
0.1%

Accuracy ± (0.01%+5)
± (2%+5)

Range 10.00Hz~10.00MHZ
0.1%~99.9%

UT61B+/UT61D+ Resolution
0.01Hz~0.01MHz 0.1%

Accuracy ± (0.1%+4) ± (2.0%+5)

Frequency input amplitude: 100kHz: 200mVrms input amplitude 20Vrms

100kHz~1MHz: 600mVrms input amplitude 20Vrms >1MHz (UT61B+/UT61D+): 1Vrms input amplitude 20Vrms >1MHz~40MHz (UT61E+): 1Vrms input amplitude 20Vrms 40MHz (UT61E+): Not specified Duty ratio measurement is only applicable to square waves. 1Vpp input amplitude 20Vpp Frequency 10kHz, duty ratio: 10.0% ~ 90.0% Overload protection: 1000V
34

12. Indicator Light

Function

Status

NCV

Off On, red

Off

Continuity On, red

On, green

Off

Diode

On, red

On, green

AC/DC voltage

Off On, red

Current

Off On, red

Internal temperature during AC/DC current measurement

Off On, yellow

Description
<36V 50V~1000V (the red indicator light flashes from slow to fast)
OL No continuity (70) Continuity (<50)

2V Breakdown (<0.12V) Conduction (0.12V~2V) 1000V >1000V 10A >10A The temperature in the meter drops to <40°C after measurement of large current.
The temperature in the meter is 75°C after measurement of large current.

Maintenance

Warning: Before opening the rear cover or battery cover of the meter, switch off the power supply and remove the test leads.
1. General Maintenance

1. Clean the meter casing with a damp cloth and mild detergent. Do not use abrasives or solvents!

2. If there is any malfunction, stop using the meter and send it for maintenance. 3) The maintenance and service must be implemented by qualified professionals
   or designated departments.
   35

3. Resistance measurement can be used to check the built-in 1Aand 10A fuses. Operation (Picture 18a): Insert the red test lead into the or terminal. Insert the red probe into the mA/A input terminal to measure the resistance. If the LCD displays “OL”, the 1A fuse is blown. Insert the red probe into the A input terminal to measure the resistance. If the LCD displays “OL”, the 10A fuse is blown.
   2. Battery/Fuse Replacement (Picture 18b)
   Battery: 4×1.5V AAA batteries Fuse: F1 Fuse 1A 240V 6x25mm (mA/A input terminal) F2 Fuse 10A 240V 6x25mm (A input terminal)
   When ” ” is displayed, please replace the batteries in time to ensure measurement accuracy.
   Replacement steps: 1) Turn the function dial to the “OFF” position, and remove the test leads. 2) Unscrew and remove the battery cover to replace the batteries and fuses.

RANGE

10A 1

OL

mAµA 20M OL

FUSED 250V max MAX 10sec EACH 15min

Picture 18b

Picture 18a The contents of this manual are subject to change without prior notice.

36

References

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