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CONTENTS
A. Introduction
B. Safety Information
C. Rules for safe operation
D. International Electrical Symbols
E. General Specifications
F. Specification
G. Operation plate
H. Make Measurements
I. Fuse and battery replacement
J. Accessories
Remark:
The model of UT30B,UT30C,UT30D will be marked as UT30BL,UT30CL
UT30DL,if they have backlight function.
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Model UT30B/C/D/F: OPERATING MANUAL
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UT30 series Multimeter is 3 1/2 digits with steady operations,fashionable
structure and highly reliable hand-held measuring instrument. The meter
can measure DC/AC voltage, DC/AC current, Resistance, Frequency,
Temperature, Diode, Transistor hFE, and Continuity. It is an ideal tool for
maintenance.
A. Introduction
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This Meter complies with the standards IEC61010-1: in pollution degree 2, overvoltage
category (CAT I 600V, CAT II 300V) and double insulation.
CAT. I: Signal level, special equipment or parts of equipment, telecommunication,
electronic, etc., with smaller transient overvoltages than overvoltages CAT. II.
CAT. II: Local level, appliance, PORTABLE EQUIPMENT etc., with smaller transient
overvoltages than CAT. III
Use the Meter only as specified in this operating manual, otherwise the protection
provided by the Meter may be impaired.
B. Safety Information
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C.Rules for safe operation(1)
l Use the meter only as the rules specified in this manual, otherwise,
the protection provided by the meter may be impaired.
l Do not operate the meter unless the bottom case has been closed as
terminal can carry voltage.
l Inspect the insulation of the test leads and make sure there is no
damage to the test leads before using the meter.
l As soon as the battery indicator’s“ ” appear, replace the battery to
ensure accurate readings.
l Set the meter to suitable function and range before each measurement.
l Tested values over the maximum range of each measurement can
cause damages to the meter or electric shock to users.
l To avoid damages of the meter, do not turn the rotary switch during
measurement
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Model UT30B/C/D/F: OPERATING MANUALModel UT30B/C/D/F: OPERATING MANUAL
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Model UT30B/C/D/F: OPERATING MANUAL
l When measuring voltage higher than DC 60V or AC 30Vrms, pay
extra attention to avoid electric shock.
l Make sure to replace right type and right rating fuse.
l Do not operate or store the Meter under high temperature or humid
condition.
l Do not change internal circuit to avoid damages to the meter and
danger to the user.
l Periodically wipe the case with damp cloth and mild detergent. Do
not use abrasives and solvents.
l The meter is designed to withstand the stated maximum voltages.
If it not possible to exclude without doubts that impulses,transients,
disturbance or for other reasons these voltages are exceeded,a
suitable prescaler (1:10) must be used.
C.Rules for safe operation(2)
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D.International Electrical Symbols
Low Battery Earth Ground
Warning
Double Insulation
AC current
Diode
DC current
Buzzer
Fuse
Conforms to Standards of European Union.
AC or DC
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Model UT30B/C/D/F: OPERATING MANUAL
E.General Specifications(1)
1. The maximum voltage, between any terminal and earth, is 600Vrms.
A . The“COM”input terminal is always connected with the black test
lead.
B . The“VΩmA”input terminal is always connected with the red test
lead and is used to measure voltage up to 500V,resistance and
current up to 200mA.
C . The“10A MAX”input terminal is always connected with the red test
lead and is used to measure current greater than 200mA but no
more than 10A.
2.
10A Terminal: non-fused
3.
mA Terminal Fuse: ø5x20-315mA, 250V.(Fast)
4. Maximum Display is 1999,and updates two or three times every second.
5. Over range display is “1” or “OL”. (Only UT30F).
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E.General Specifications(2)
6. Temperature:
Operating: 0
o
C-40oC (32 oF-104 oF)
Storing:-10
o
C-50oC (14 oF -122 oF)
7. Altitude:
Operating:2000m
Storage:10000m
8 Relative humidity:Max.relative humidity 80% for temperature up to
31
o
C decreasing linearly to 50% relative humidity at 40oC.
9. Battery: 9V NEDA 1604 or 6F22 or 006P.
10. Low Battery Indication: Display “ ”.on LCD.
11. Dimension:75mmx130mmx36mm
12. Weight: approx. 150g(Test Leads not included)
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Model UT30B/C/D/F: OPERATING MANUAL
F.Specification(1)
Accuracy: (a% reading + b digit), which guarantee one year.
Environmental Temperature:23
o
C 5oC
Relative Humidity: <75%
Input Impedance:10MΩ for all the ranges.
Overload protection: At 200mV range, it’s protected at 230V(AC / DC
Current), others are protected at 500V(AC or DC).
Range
Resolution
Accuracy
200mV
2000mV(2V)
20V
200V
500V
100µV
1mV
10mV
100mV
1V
UT30B UT30C UT30D UT30F
(0.5%+2)
(0.8%+2)
1. DC Voltage
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F.Specification(2)
2. AC Voltage
Input Impedance: (approx. 5MΩ ) of UT30B\C\D, but all ranges of
UT30F are 10MΩ .
Frequency: 40-400Hz
Display: RMS of Sine Wave Value (Average Value)
Overload protection: At 200mV range, it is protected at 230V(AC / DC
Current), others are protected at 500V(AC or DC )
Range Resolution
Accuracy
200mV
2V
20V
200V
500V
100µV
1mV
10mV
100mV
1V
UT30B UT30C UT30D UT30F
(1.2%+10)
(1.2%+3)
(1.2%+3)
(1%+3)
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Model UT30B/C/D/F: OPERATING MANUAL
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F.Specification(3)
Range Resolution
Accuracy
200µA
2000µA(2mA)
20mA
200mA
10A
100nA
1µA
10µA
100µA
10mA
UT30B UT30C UT30D UT30F
(1.2%+2)
(2%+5)
(1%+2)
Overload Protection:315mA/250V fuse, No fuse at 10A,measuring time
limit is equal to or less than 10 seconds, and time interval should be equal
to or over 15 minutes.
Measuring voltage drop: Full range is 200m V.
3. DC Current
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F.Specification(4)
4. AC Current(Only UT30F)
Overload Protection: 315mA/250V fuse, No fuse at 10A,measuring
time limit is equal to or less than 10 seconds; time interval is equal to or
over 15 minutes.
Frequency response: 40Hz-400Hz
Display: RMS of Sine Wave Value (Average Value)
Range Resolution
Accuracy
(1.8%+3)
200mA
10A
100µA
10mA
(3%+7)
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Model UT30B/C/D/F: OPERATING MANUAL
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F.Specification(5)
5. Resistance
Range Resolution
Accuracy
200Ω
2000Ω(2kΩ)
20kΩ
200kΩ
2MΩ
20MΩ
0.1Ω
1Ω
10Ω
100Ω
1kΩ
10kΩ
UT30B UT30C UT30D UT30F
(0.8%+5)
(1%+5)
(0.8%+2)
Overload Protection: All ranges are 230V(DC/ AC current).
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Model UT30B/C/D/F: OPERATING MANUAL
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Model UT30B/C/D/F: OPERATING MANUAL
F.Specification(7)
7. Frequency(Only UT30F Auto Range)
Range
Resolution
Accuracy
(0.1%+3)
2kHz 10MHz 1Hz 10kHz
8. Square Wave Output(Only UT30D)
Range
Illustration
OUT
Output approx. at 50Hz Square Wave .As a simple
signal source , with 100kΩ resistance output.
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Model UT30B/C/D/F: OPERATING MANUAL
F.Specification(8)
No overload protection for this range; make sure voltage
output of calibrated equipment is less than 10V to avoid damages to the
Meter.
9. Diode, Transistor, Continuity Beeper Test
Function Range Resolution 30B 30C 30D 30F Remark
Transistor
Continuity
Beeper
Test
hFE
1β
1Ω
Display
voltage
drop
approximation.
Diode
Ibo 10µA
Vce 3V
for UT30F 30Ω
others 70Ω
Buzzer sound
1mV
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Model UT30B/C/D/F: OPERATING MANUAL
G.Operation Plate
Overload Protection: 230V(DC/ AC current),Only
Operation Plate(see figure 1)
1. Liquid Crystal Display
2. Data hold or backlight selection button
except UT30F(AC/ DC exchange)*
3. Rotary Switch
4. Transistor Test Jack
5. Common Input Jack
6. 10A Input Jack
7. Input Jack for General Measurement
* If the model has backlight function as UT30BL,UT30CL,UT30DL,
press the button abidingly over 3 seconds,backlight will be opened, it
will shut off automatically after 20 seconds late.
( figure 1)
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Model UT30B/C/D/F: OPERATING MANUAL
H.Make Measurements(1)
First, set rotary switch to proper position. When the battery is low,“ ”will
appear on LCD. Second, the “
” symbol beside the input jack warns you
when testing current and voltage. Input values must not exceed the limit.
1.DC Voltage Measurement(see figure 2)
( figure 2)
black red
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1) Never measure voltage value exceeding 500V, although it is possible
to get the reading. This may cause damages to the internal circuit and
danger to users;
2) Set rotary switch to maximum range, if the voltage value to be tested
is unknown. Then according to reading requirement adjust to a lower
range until satisfactory reading is obtained.
3) If “1”or “OL” is shown on LCD, set to the higher range because the
selected range is overloaded.
4) At every range, input impedance is 10MΩ This can cause measuring
tolerance at high impedance, If circuit impedance is equal to or less
than 10kΩ ,you can ignore the tolerance(0.1% or lower).
H.Make Measurements(2)
Model UT30B/C/D/F: OPERATING MANUAL
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H.Make Measurements(3)
2. AC Voltage Measurement (see figure 3)
Same as DC voltage measurement.
(figure 3)
black red
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Model UT30B/C/D/F: OPERATING MANUAL
H.Make Measurements(4)
3. DC Current Measurement(see figure 4)
1) Do not measure when value between open voltage and earth is
exceeding safety voltage 60V because it may cause damages to the
measuring object or instrument and also hurt the user.
(figure 4)
black red
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2) Before measurement, cut off the power to the object to be measured
and inspect if input terminal or rotary switch is set to the right range
then you can measure the object with power on.
3) If the magnitude of current is unknown, set rotary switch to the highest
range and then adjust to a lower range until a satisfactory reading is
obtained.
4) If the meter is overloaded on mA input jack the fuse will melt up. In this
case, replace with a new fuse with same specification.
5) The dimension of fuse is ø5x20(mm)and the specification is F.315mA/
250V (FAST).
6) For 10A input jack, it is non-fused. For safety, each measuring time
should be equal to or less than 10 seconds. Time intervals should be
equal to or over 15 minutes.
H.Make Measurements(5)
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Model UT30B/C/D/F: OPERATING MANUAL
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H.Make Measurements(6)
Same as DC current measurement
(figure 5)
4. AC Current Measurement(Only for UT30F)(see figure 5)
black red
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Model UT30B/C/D/F: OPERATING MANUAL
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Model UT30B/C/D/F: OPERATING MANUAL
H.Make Measurements(7)
5. Resistance Measurement (see figure 6)
(figure 6)
1) To avoid damages to the Meter when
measuring resistance, cut off the power
of the object and make sure there is no
charge in capacitor.
2) Test lead wires take 0.1Ω -0.3Ω tolerance
when measuring resistance. To get an
accurate reading, subtract the short circuit
values of the 2 test leads.
3) It will take several seconds for the display
to become stabilized when resistance value
is over 1MΩ.
black red
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Model UT30B/C/D/F: OPERATING MANUAL
H.Make Measurements(8)
6. Diode measurement (see figure 7)
(figure 7)
1) Avoid damages to the meter. When
measuring diode, cut off the power supply
of the object and make sure there is no
charge in capacitor.
2) When measuring voltage drop of diode,
transistor, and other semiconductor
component at diode function, its silicon
semiconductor structure should be normal
positive reading and stay between 0.5V
and 0.8V. Negative display being “1” means
open circuit; when the red test lead is
positive pole and the black one is negative pole.
black red
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Model UT30B/C/D/F: OPERATING MANUAL
H.Make Measurements(9)
7. Transistor hFE Measurement (see figure 8)
1) Check that the transistor is
PNP or NPN type.
2) Connect the transistor to be
measured to the corresponding
jacks.
3) LCD display hFE reference value.
4) Measuring condition:Ibo 10µA,
Vce 3V
(figure 8)
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Model UT30B/C/D/F: OPERATING MANUAL
H.Make Measurements(10)
8. Temperature Measurement:(Only for UT30C)(see figure 9)
1) Insert the black K type thermocouple
(P/N:41700103) into “COM” socket.
Red lead of temp. probe into “
o
C” socket,
LCD displays the measuring value with
unit in
o
C.
2) The temperature probe limits to below
250
o
C. For a higher degree of temperature
measurement, use another hand-held
thermocouple (P/N:41700107). The LCD
display room temperature when unloading
the probe.
(figure9)
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Model UT30B/C/D/F: OPERATING MANUAL
H.Make Measurements(11)
9. Square Wave Output:(Only UT30D) (see figure 10)
1) To avoid damages to the meter, do
not let output terminal reach
higher then 10V voltage.
2) The frequency is 50Hz.
3) The output voltage range will be
over 3V when it is loaded 1MΩ.
4) Use square wave output to repair
audio equipment.
(figure10)
black red
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Model UT30B/C/D/F: OPERATING MANUAL
H.Make Measurements(12)
10. Frequency Measurement (Only for UT30F)(see figure 11)
1) Do not input voltage over 230V RMS to
avoid damages to the meter.
2) The LCD will display reading when the
measured frequency is more than 10V,
but the read out may exceed specification.
To obtain an accurate, stable reading, an
external attenuator should be used.
3) To measure high frequency signal in high
interferenced environment use shielded
cable.
(figure11)
black red
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Model UT30B/C/D/F: OPERATING MANUAL
I.Fuse and battery replacement
1) Turn the rotary switch to OFF position,and
remove the test leads from terminals.
2) Remove two rubber feet and two screws from
the bottom case.
3) Separate the bottom case from the top case.
4)
H. Fuse and battery replacement(see figure 12)
(figure12)
Replace the battery or fuse as per the following
specification:
Battery: 9V NEDA 1604 or 6F22 or 006P
Fuse:
a) mA Terminal: ø5x20-315mA, 250V (Fast)
b) 10A Terminal: Unfused
5) Rejoin the bottom case and top case,and
reinstall two screws and two rubber feet.
Page 31
** END **
This operating manual is subject to change without notice.
J.Accessories
1) Operating manual
2) Test leads
3) Thermocouple(Only for UT30C)
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Model UT30B/C/D/F: OPERATING MANUAL
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Manufacturer: UNI-TREND TECHNOLOGY(DONG GUAN)LIMITED
Address: Dong Fang Da Dao, Bei Shan Dong Fang Industrial
Development District, Hu Men Town, Dong Guan City,
Guang Dong Province, China
Headquarters: Uni-Trend International Limited
Address: 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
Copyright 2001 Uni-Trend International Limited.
All rights reserved.
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Model UT30B/C/D/F: OPERATING MANUAL
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