UNI-T UT30C Operating Manual

Model UT30B/C/D/F: OPERATING MANUAL

CONTENTS

A. Introduction

B. Safety Rules

C. International Electrical Symbols

D. Feature

E. Specification

F. Operation Plate

G. Make Measurement

H. Fuse and battery replacement

I. Accessories

Remark:

The model of UT30B,UT30C,UT30D will be marked as UT30BL,UT30CL

UT30DL,if they have backlight function.

1


Summary of UT30 Series DMM

A.Introduction

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.

2


B. Safety Rules(1)

CAUTION-FOR CONTINUED PROTECTION AGAINST FIRE, REPLACE

ONLY WITH FUSE OF THE SPECIFIED VOLTAGE AND CURRENT

RATINGS.

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.

l When measuring voltage higher than DC 60V or AC 30Vrms, pay

extra attention to avoid electric shock.

3


B. Safety Rules(2) 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’s 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.

4


C. International Electrical Symbols

Low Battery

Warning

AC current

DC current

Fuse

Earth Ground

Double Insulation

Diode

Buzzer

AC or DC

5


D.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“V, ohm, mA”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: ø 5x20-0.3A 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).

6


D.General Specifications(2)

6. Temperature:

Operating: 0 o

C -40 o

C (32 o

F -104 o

F )

Storing:-10 o

C -50 o

C (14 o

F -122 o

F )

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 40 o

C.

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)

7


E.Specification(1)

Accuracy: (a% reading + b digit), which guarantee one year.

Environmental Temperature:23 o

C 5 o

C

Relative Humidity: <75%

1. DC Voltage

Accuracy

UT30B UT30C UT30D UT30F

Range Resolution

200mV

2000mV(2V)

20V

200V

500V

100

µ

V

1mV

10mV

100mV

1V

(0.5%+2)

(0.8%+2)

Input Impedance:10M Ω 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).

8


E.Specification(2)

2. AC Voltage

Range Resolution

200mV

2V

20V

200V

500V

100 µ

1mV

V

10mV

100mV

1V

Accuracy


(1.2%+3)

(1.2%+10)

(1%+3)

(1.2%+3)

Input Impedance: (approx. 5M

Ω

) of UT30B\C\D, but all ranges of

UT30F are 10M

Ω

.

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 )

9


E.Specification(3)

3. DC Current

Range

200 µ A

2000 µ A(2mA)

20mA

200mA

10A

Resolution

100nA

1 µ A

10 µ A

100 µ A

10mA

Accuracy


(1%+2)

(1.2%+2)

(2%+5)

Overload Protection: 0.3A/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.

10


E.Specification(4)

4. AC Current(Only UT30F)

Range Resolution

200mA 100 µ A

10A 10mA

Accuracy

(1.8%+3)

(3%+7)

Overload Protection: 0.3A/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)

11


E.Specification(5)

5. Resistance

Range

200 Ω

2000 Ω (2k Ω )

20k Ω

200k Ω

2M Ω

20M Ω

Resolution

0.1

Ω

1 Ω

10 Ω

100 Ω

1k Ω

10k Ω

Accuracy


(0.8%+5)

(0.8%+2)

(1%+5)

Overload Protection: All ranges are 230V(DC/ AC current).

12


E.Specification(6)

6. Temperature(Only UT30C)

Range

-40 o

C 150 o

C

150 o

C 1000 o

C

Resolution

1 o

C

1 o

C

Accuracy

(1%+3)

(1.5%+15)

13


E.Specification(7)

7. Frequency(Only UT30F Auto Range)

Range Resolution

2kHz 10MHz 1Hz 10kHz

Accuracy

(0.1%+3)

Overload Protection: 230V(AC / DC current)

Input Sensitivity: (10Hz- 1MHz) 500m V;

(1MHz-10MHz) 1V.

MAX input scope 10V.

8. Square Wave Output(Only UT30D)

Range

OUT

Illustration

Output approx. at 50Hz Square Wave .As a simple signal source , with 100k

Ω resistance output.

14


E.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

Diode

Transistor

Continuity

Beeper

Test hFE

1mV

1

1

β

Ω

Display voltage drop approximation.

Ibo 10 µ A

Vce 3V others 70

Ω

Buzzer sound

15


F.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

( figure 1)

* 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.

16

Model UT30B/C/D/F: OPERATING MANUAL

G.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)

17



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 10M Ω This can cause measuring

tolerance at high impedance, If circuit impedance is equal to or less

than 10k Ω , you can ignore the tolerance(0.1% or lower).

18



2. AC Voltage Measurement (see figure 3)

Same as DC voltage measurement.

(figure 3)

19



3. DC Current Measurement(see figure 4)

(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.

20



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 ø 5x20(mm)and the specification is F.0.3A/

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.

21



4. AC Current Measurement(Only for UT30F)(see figure 5)

(figure 5)

Same as DC current measurement

22



5. Resistance Measurement (see 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 0.1

Ω -0.3

Ω 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 1M Ω.

23

(figure 6)



6. Diode measurement (see 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.

24

(figure 7)



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 10 µ A,

Vce 3V

(figure 8)

25



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)

26



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 1M Ω .

4) Use square wave output to repair

audio equipment.

(figure10)

27



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)

28


Fuse and battery replacement

H. Fuse and battery replacement(see figure 12)

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) Replace the battery or fuse with in user s

manual specification.

5) Rejoin the bottom case and top case,and

reinstall two screws and two rubber feet.

(figure12)

29


I.Accessories

1) Operating manual

2) Test leads

3) Thermocouple(Only for UT30C)

** END **

This operating manual is subject to change without notice.

30


31


Copyright 2001 Uni-Trend International Limited.

All rights reserved.

Manufacturer:

Uni-Trend International Limited

Rm901, 9/F, Nanyang Plaza

57 Hung To Road

Kwun Tong

Kowloon, Hong Kong

Tel: (852) 2950 9168

Fax: (852) 2950 9303

Email: [email protected]

http://www.uni-trend.com

32

UNI-T UT30C Operating Manual

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