UNI-T UT61A, UT61B, UT61C, UT61D, UT61E User manual

Model UT61A/61B/61C/61D/61E: OPERATING MANUAL

Table of Contents
Title Page

Overview
Unpacking Inspection
Safety Information
Rules For Safe Operation
International Electrical Symbols
The Meter Structure
Rotary Switch
Functional Buttons
Display Symbols
Measurement Operation

A.DC/AC Voltage Measurement
B.DC/AC Current Measurement
C.Measuring Resistance
D.Testing for Continuity
E.Testing Diodes
F.Capacitance Measurement
G.Frequency Measurement
H.Temperature Measurement

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Model UT61A/61B/61C/61D/61E: OPERATING MANUAL

Title Page

I.Transistor hFE Measurement
J.EF Function
Operation of Hold Mode

RANGE Button
MAX MIN Button
PEAK Button

Data Outputting
The Use of Relative Value Mode
The BLUE Button
Turning on the Display Backlight
Sleep Mode
General Specifications
Accuracy Specifications
A.DC Voltage
B.AC Voltage
C.DC Current
D.AC Current
E.Resistance

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Model UT61A/61B/61C/61D/61E: OPERATING MANUAL

Title Page

F.Capacitance
G.Frequency
H.Diode Test
I.Continuity Test
J.Temperature
K.Transistor hFE
Maintenance
A.General Service
B.Replacing the Battery
C.Replacing the Fuses
USB and RS232C Serial Port

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Model UT61A/61B/61C/61D/61E: OPERATING MANUAL

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

Warning

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Model UT61A/61B/61C/61D/61E: OPERATING MANUAL

Except where noted, the descriptions and instructions in this Operating Manual apply
to all Model UT61A/UT61B/UT61C/UT61D/UT61E.

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

1

Operating Manual

2

Test Lead

3

Point Contact K type Temperature Probe (UT61B and UT61C only)
UT61 Multi-Purpose Socket

4

9V Battery (NEDA1604, 6F22 or 0006P) (installed inside the Meter)

5

RS232C Interface Cable(except UT61A)

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USB Interface Cable (Optional at extra cost) (except UT61A)

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Installation Guide & Computer Interface Software (CD-ROM) (Come

8

along with the RS232C or USB Interface Cable) (except UT61A)

5

Qty

1 piece
1 pair
1 piece
1 piece
1 piece
1 piece
1 piece

1 piece

Model UT61A/61B/61C/61D/61E: OPERATING MANUAL

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

Safety Information

This Meter complies with the standards IEC61010: in pollution degree 2, overvoltage
category (CAT. III 1000V, CAT. IV 600V) 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 etc.
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 on.

International electrical symbols used on the Meter and in this Operating Manual are
explained on page9.

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Model UT61A/61B/61C/61D/61E: OPERATING MANUAL

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:

l 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.
l Inspect the test leads for damaged insulation or exposed metal. Check
the test leads for continuity. Replace damaged test leads with identical
model number or electrical specifications before using the Meter.
l Do not apply more than the rated voltage, as marked on the Meter, between
the terminals or between any terminal and grounding.
l The rotary switch should be placed in the right position and no any
changeover of range shall be made during measurement is conducted to
prevent damage of the Meter.
l When the Meter working at an effective voltage over 60V in DC or 30V
rms in AC, special care should be taken for there is danger of electric
shock.

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Model UT61A/61B/61C/61D/61E: OPERATING MANUAL

l 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.

l When using the test leads, keep your fingers behind the finger guards.
l Disconnect circuit power and discharge all high-voltage capacitors before

testing resistance, continuity and diodes.
l Before measuring current, check the Meterís fuses and turn off the current
to be tested before connecting the Meter to the circuit. After connecting
the circuit reliably, turn the current to be tested on.
l 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.

l When servicing the Meter, use only the same model number or identical
electrical specifications replacement parts.
l The internal circuit of the Meter shall not be altered at will to avoid damage
of the Meter and any accident.
l 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.
l The Meter is suitable for indoor use.

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Model UT61A/61B/61C/61D/61E: OPERATING MANUAL

l Turn the Meter off when it is not in use and take out the battery when not
using for a long time.
l 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.

International Electrical Symbols

AC or DC
Double Insulated
Warning. Refer to the Operating

Manual

Grounding
Deficiency of Built-In Battery
Conforms to Standards of

European Union

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The Meter Structure (see figure 1)

LCD Display

1

Functional Buttons

2

Blue button

3

Rotary Switch

4

Input Terminal:

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Model UT61A/61B/61C/61D/61E: OPERATING MANUAL

figure 1

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Model UT61A/61B/61C/61D/61E: OPERATING MANUAL

Rotary Switch

Below table indicated for information about the rotary switch positions.

AC and DC Voltage Measurement

mV

AC Voltage Measurement (UT61D only)
DC Voltage Measurement (UT61D only)
Resistance Measurement
Diode Test
Continuity Test
Capacitance Test
Frequency and Duty Cycle Test
Temperature in Celsius (UT61B and UT61C only)
Temperature in Fahrenheit (UT61B and UT61C only)
Transistor (UT61A only)
DCA and ACA Measurement
DCmA and ACmA Measurement
10A DC and AC Measurement
Sensor Test (UT61A only)

OFF

Power off

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Model UT61A/61B/61C/61D/61E: OPERATING MANUAL

Functional Buttons

Below table indicated for information about the functional button operations.

Button
Hold

BLUE Button
RANGE

REL

PEAK (UT61E only)

Operation Performed
Press and hold for 2 serconds to turn the display backlight on or off.
Press to enter or exit data hold mode.
Press to select the alternate feature

Press RANGE to enter the manual ranging mode;
the Meter beeps.

Press RANGE to step through the ranges available for the
selected function; the Meter beeps.

Press and hold RANGE for 2 seconds to return to autoranging;
the Meter beeps

Press to select the maximum and minimum value.

Press to enter REL mode.
Press again to exit REL mode
For Model UT61C, UT61C and

Press and hold for over 2 seconds to enter or exit RS232C or
USB mode.

"CAL" means the meter enter self-calibration mode.

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Model UT61A/61B/61C/61D/61E: OPERATING MANUAL

Display Symbols

No

1
2
3
4
5
6

7
8

9
10
11
12
13
14

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Symbol

Meaning
Data hold is active.
Sleep Mode indicator
Indicates negative reading.
Indicator for AC measurement
Indicator for DC measurement
The Meter is in the auto range mode in which the Meter automatically

selects the range with the best resolution.
Indicator for manual ranging mode.
The input value is too large for the selected range.
Transistor testing indicator
Test of diode
The continuity buzzer is on.
Maximum and Minimum reading.
Data output is in progress
The battery is low.

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

Sensor test is in progress

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Model UT61A/61B/61C/61D/61E: OPERATING MANUAL

No

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Symbol Meaning

The REL is on to display the stored value minus the present value.

: Ohm. The unit of resistance.
k : kilohm. 1 x 103 or 1000 ohms.
M : Megaohm. 1 x 106 or 1,000,000 ohms.
V: Volts. The unit of voltage.
mV: Millivolt. 1 x 10-3 or 0.001 volts.
A: Amperes (amps). The unit of current.
mA: Milliamp. 1 x 10-3 or 0.001 amperes
µA : Microamp. 1x 10
F: Farad. The unit of capacitance.

µF : Microfarad. 1 x 10
nF : Nanofarad. 1 x 10-9 or 0.000000001 farads.

: Centigrade. The unit of temperature.

: Fahrenheit. The unit of temperature.

Hz: Hertz. The unit of frequency in cycles/second.
kHz: Kilohertz. 1 x 103 or 1,000 hertz.
MHz: Megahertz. 1 x 106 or1,000,000 hertz.
The unit of transistor

-6

or 0.000001 amperes

-6

or 0.000001 farads.

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Model UT61A/61B/61C/61D/61E: OPERATING MANUAL

Measurement Operation

A. DC/AC Voltage Measurement (See figure 2)

figure 2

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Model UT61A/61B/61C/61D/61E: OPERATING MANUAL

Warning
To avoid harms to you or damages to the Meter from electric shock, please do

not attempt to measure voltages higher than 1000V although readings may be
obtained.

When measuring high voltage, take extra care to avoid electric shock.

1. Insert the red test lead into the V terminal and the black test lead into the COM
terminal.

2. Set the rotary switch to V; DC measurement is default or press BLUE button to
switch between DC and AC measurement mode.

3. Connect the test leads across with the object being measured. The measured
value shows on the display.
UT61A, UT61B and UT61C: display effective value of sine wave (mean value
response).
UT61D and UT61E: display true rms value.

4. Press Hz% to obtain the frequency and duty cycle value.

Input Amplitude: (DC electric level is zero)
Input Amplitude: range 30%
Frequency respouse:UT61A and B 400Hz

UT61C,UT61D and UT61E 1KHz

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Model UT61A/61B/61C/61D/61E: OPERATING MANUAL

Note

l In each range, the Meter has an input impedance of 10M except mV range
which input impedance is 3000M . This loading effect can cause measurement
errors in high impedance circuits. If the circuit impedance is less than or equal
to 10k , the error is negligible (0.1% or less).
l For UT61A and UT61B:When measuring mV, you must press RANGE manually
to enter mV range.
l When voltage measurement has been completed, disconnect the connection
between the testing leads and the circuit under test, and remove the testing leads
away from the input terminals of the Meter.

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Model UT61A/61B/61C/61D/61E: OPERATING MANUAL

B. DC/AC Current Measurement (See figure 3)

A

figure 3

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Model UT61A/61B/61C/61D/61E: OPERATING MANUAL

Warning
Before connecting the Meter to the return circuit to be tested, cut off the current

of the return circuit.

If the fuse burns out during measurement, the Meter may be damaged or the

operator himself may be hurt.
Use proper terminals, function, and range for the measurement.
When the testing leads are connected to the current terminals, do not parallel

them across any circuit.

To measure current, do the following:

1. Insert the red test lead into the mA or A input terminal and the black test lead
into the COM terminal.

2. Set the rotary switch to A, mA, or A.

3. The Meter defaults to DC current measurement mode. To toggle between DC
and AC current measurement function, press BLUE button.

4. Connect the test lead in serial to the return circuit to be tested. The measured
value shows on the display.

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Model UT61A/61B/61C/61D/61E: OPERATING MANUAL

UT61A, UT61B and UT61C: display effective value of sine wave (mean

value response).
UT61D and UT61E: display true rms value.

5. Press Hz% to obtain the frequency and duty cycle value.

Input Amplitude: (DC electric level is zero)
Input Amplitude: range 30%
Frequency response:UT61A and B 400Hz

UT61C , UT61D andUT61E 1KHz

Note

l If the value of current to be measured is unknown, use the maximum measurement
position, and reduce the range step by step until a satisfactory reading is obtained.
l For safety sake, each measurement time for >5A current should be less than
10 seconds and the interval time between 2 measurements should be greater
than 15 minutes.
l When current measurement has been completed, disconnect the connection
between the testing leads and the circuit under test, and remove the testing leads
away from the input terminals of the Meter.

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Model UT61A/61B/61C/61D/61E: OPERATING MANUAL

C. Measuring Resistance (See figure 4)

figure 4

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