UNI-T ut151a, ut151b, ut151c, ut151d, ut151e Operating Manual

P/N:110401102629

TABLE OF CONTENTS

Item Page
I. Characteristics---------------------------------------------------------------------------------------- --------------3
II. Technical data------------------------------------------------------------------------------------------------------ 3
III. Operating method ------------------------------------------------------------------------------------------------9
IV. Maintenance of instrument ---------------------------------------------------------------------- ------------15
V. Accessories -------------------------------------------------------------------------------------------------------17

OVERVIEW

3 1/2-bit DDM in the brand-new UT151 series is a kind of hand-held 3 1/2-bit digital
universal meter with stable performance and high reliability. The large-scale integrated circuits
and dual integral A/D transducer are the core design of circuits of the overall instrument and
overload protection with full range of functions is also provided. It can be used to measure the
DC voltage and AC voltage, electric current, resistance, capacitance, diode, triode, temperature,
frequency, battery and the circuit break-make. It's your ideal tool.

SAFETY RULES AND PRECAUTIONS

This instrument is designed and manufactured in strict accordance with safety requirements
of electronic measuring instrument in GB4793 as well as safety standards of IEC61010-1
and IEC100-2-O32. It also complies with the safety standards of double insulation, over
voltage CAT I 1000V, CAT II 600V and pollution class 2.F ollow t he i nstructions o f t his M anual,
or the protection of the instrument will be damaged.

Ensure that it cannot be operated before the back cover is put in the place, otherwise there is
a risk of electric shock.

The range switch shall be installed at the correct position.

Check and ensure the insulation layer of the pen is in good condition without damage and
broken line.

The red and black pens should be inserted in the hole which meet the measurement
requirement; ensure well contact.

The input signal is not allowed to exceed the limit value to avoid electric shock and damage.

Changing range switch shift is strictly prohibited during the measurement of voltage and
current in order to avoid damaging the instrument.

If you want to change the bad fuse and you must use the one of the same type.
In order to avoid electric shock, the potential difference between common port COM a nd

the earth is not exceeded 1000V.

When the voltage to be measured is more than 60 DC or 30 Vrms AC, you must be careful

to avoid electric shock.

When the LCD shows the symbol of , you must change the battery in time to ensure the

measuring accuracy.

Turn off the power after finishing the measurement. If you do not use it for a long time, take

out the battery.

Don't operate this instrument under high temperature or high humidity. Especially, it cannot
be stored in damp environment. If the instrument is affected with damp, its performance will
be damaged.

Don't change the circuits of the instrument at random, otherwise, you will damage the
instrument and be in danger.

Maintenance: Clean the shell of the instrument with wet cloth or mild cleaning agent rather
than abrasive objects or solvent.

Symbols

Lower battery level

Buzzer

Fuse

Grounding

AC

Double insulation

Warning

DC

Diode

I.CHARACTERISTICS

1. There are 30 ranges for function selection.

2. LCD display with visible zone 63 29mm

3. Over-range indication 1 .

4. The maximum value displayed of 1999(three and half digits)

5. Overload protection for the full range.

6. Automatic power cut-off

7. Temperature range Working temperature: 0 ~40 (32 ~104 ) Storage temperature:

-10 ~50 (14 ~122 )

8. Indication of lower battery level: The upper-left corner of LCD will show the symbol of

9. The function to keep number of all shifts.

10. Physical dimensions: 186mm x 91mm x 39mm

11. Weight: Approximate 300g (instrument +protection sleeve + bracket+ battery, excluding
pens)

II.TECHNICAL DATA

Accuracy: (a% reading +digit); the guarantee period is 1 year.
Ambient temperature: 23 5
Relative humidity: <75%

2-1. DC voltage

Range

200mV

2 V

20 V

200 V

1000 V

nput impedance: 10MÙ for all ranges
Overloading protection: For 200mV range, 250V, DC or AC effective value. For other ranges,
750Vrms or 1000Vp-p peak value.

2-2. AC voltage

Range

2 V

20 V
200 V
750 V

Input impendence: 10 MÙ for all ranges
Frequency range: 45Hz-400Hz
Overloading protection: 750 Vrms or 1000Vp-p peak
Display: Mean value (sine-wave effective value)

Resolution

100µV

1 mV

10mV

100mV

1 V

Resolution

1 mV

10mV

100mV

1 V

UT151A UT151B

UT151A UT151B

Accuracy

UT151C

(0.5%+1)

(0.8 %+2)

Accuracy

UT151C

(0.8%+3)

(1.5%+5)

UT151D UT151E

UT151D UT151E