Uni-T UT890C Manual

Uni-T Måling UT890C

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Side 1/2

Buzzer

Fuse

Auto shut off

Grounding

Double Insulation

Relative Measurement

Warning

Diode

Range

600mV 0.1mV

0.001V

0.01V

0.1V

60V

600V

1000V

Resolution Accuracy

±(0.5%+4)

±(0.5%+2)

±(0.7%+10)

Range

600 0.1Ω Ω

0.001kΩ

0.01kΩ

0.1kΩ

0.001MΩ

0.01MΩ

6kΩ

60kΩ

600kΩ

6MΩ

60MΩ

Resolution

Accuracy

±(0.8%+5)

±(0.8%+3)

±(1.0%+25)

Operating Manual

I. General Introduction

This brand new UT890C+/D Operating Manual is a handheld

3-5/6 digit True RMS Digital Multi-meter featuring stable performance

and high reliability. Its whole circuit design utilizes a large scale

integrated circuit that uses ∑△ADC converter as its core and is

further equipped with full function overload protection, making it an

ideal tool for users to measure the followings: DC and AC voltage,

electric current, resistance, capacitance, frequency, temperature

(UT890D/C+), diode, triode and continuity test.

Safety Rules and Instructions

● This unit is designed and produced in strict accordance with

GB4793, Safety Requirements for Electronic Measuring Instrument

and Safety Standards coded as IEC61010-1 and IEC1010-2-032. It

complies with safe standards, such as double insulation, over voltage

(CAT II 1000V, CAT III 600V) and class of pollution II. Please follow

the instructions contained in this manual, otherwise the protection

provided by this unit may be impaired.

● You should not use this unit unless its back cover is properly

secured in place, otherwise you are exposed to shock hazard.

●

The range switch should be switched to a correct range.

●

Check the insulation layer of the test leads to ensure no

damaged or broken cable.

●

The red and black test leads should be well inserted into the

jacks that are in compliance with the measurement requirements to

ensure good contact.

●

The input signal should not exceed the specified limit value

to avoid shock or unit damage.

● It is prohibited to change range when measuring voltage or

electric current so as to avoid unit damage.

● Damaged fuse must only be replaced with fuse with identical

specification.

● To avoid electric shock, the potential difference measured

between “COM” and earth “ ” should be no more than 1000V.

●

To avoid electric shock, test with great caution in case the

voltage to be measured maybe higher than DV 60V or AC 30Vrms.

● Battery should be replaced in time so as to ensure measurement

accuracy when the LCD displays “ ”.

● Power should be turned off immediately upon the test is completed

and battery should be taken out if it may not be used for a long

period of time.

● Do not use the unit under an environment with high temperature

and high humidity, especially not store it in a wet place as the

dampened unit may perform badly.

● Please do not change the circuit of the unit arbitrarily so as to

avoid unit damage or safety hazard.

● Maintenance: Please use wet cloth and mild detergent rather

than abrasive material or solvent for the cleaning of its exterior housing.

III. Characteristics

● More than 30 functional ranges are available.

● LCD display, visible area 63×29mm.

● Over range display “OL”.

● Maximum displayed value 5999.

● Overload protection for all ranges.

● Auto power off.

● Temperature scope:

Working temperature: 0 ~40 32 ~104℃ ℃（ ℉ ℉）

Storage temperature: -10 ~50 14 ~122℃ ℃（ ℉ ℉）

● Low battery indicator: The symbol “ ” will be displayed at top

left of the LCD.

● It has functions, including data hold, measurement of maximum/

minimum value, relative measurement, backlight, etc.

II. Symbol Description

Low battery

IV. Technical Indexes

Accuracy: ± , 1 year warranty period（）α% reading plus figure

Environment Temperature: 23 ±5℃ ℃

Relative humidity: ＜75%

1. DC Voltage

Input impedance: 1GΩfor the range of 600mV while 10MΩ for all

other ranges.

Overload protection: 750Vrms or at a peak value of 1000Vp-p.

2. AC Voltage

Range

0.001V

0.01V

0.1V

60V

600V

750V

Resolution Accuracy

±(0.8%+3)

±(1.0%+10)

Input impedance: 10MΩfor all the ranges.

Frequency scope: 40Hz – 1KHz (Only applicable to sine wave and

triangular wave, but only being referable for other waves whose

frequencies are equal or higher than 200Hz.)

Guaranteed Accuracy: within 5~100% of its range and allow less t

han 5 figures of remaining reading in case of short circuit.

Overload Protection: 750Vrms or at a peak value of 1000Vp-p.

Display: True RMS

3. DC Current

Range

60μA

0.01μA

0.001mA

0.01mA

0.1mA

0.01A

6mA

60mA

600mA

20A

Resolution Accuracy

±(0.8%+8)

±(1.2%+5)

±(2.0%+5)

Overload prote.ction: Fuse F1-630mA/250V, F2-20A/250V

Maximum input current: 20A (measuring electric current between

5A and 20A, testing time ≤10 seconds, Interval≥15 mins).

Measuring voltage drop: 600mV when at its full range.

4. AC Current

Range

6mA 0.001mA

0.01mA

0.1mA

0.01A

60mA

600mA

20A

Resolution Accuracy

±(1.0%+12)

±(2.0%+3)

±(3.0%+5)

Overload protection: Fuse F1-630mA/250V, F2-20A/250V

Frequency scope: 40Hz – 1KHz (Only applicable to sine wave and

triangular wave, but only being referable for other waves whose

frequencies are equal or higher than 200Hz.)

Guaranteed Accuracy: within 5~100% of its range and allow less

than 2 figures of remaining reading in case of short circuit.

Maximum input current: 20A (measuring electric current between

5A and 20A, testing time ≤10 seconds, Interval≥15 mins) Measuring

voltage drop: 600mV when at its full range

Display: True RMS

5. Resistance

Range of 600Ω: measured value=displayed value - value shown when

test leads are short connected Open circuit voltage: About 1V

Overload protection: 600Vrms.

6. Capacitance

Range

9.999n 0.001nFF

0.01nF～ 0.1μF

1 Fμ

10μF

99.99nF～ 999.9μF

9.999mF

99.99mF

Resolution

Accuracy

±(5.0%+35)

±(2.5%+20)

±(5.0%+10)

10mF≤C≤20mF:±(10.0%+5)

>20mF:reading is for reference only

Range: Auto (Reading for distributed capacitance of test leads may

be shown when the unit is in open circuit. It is recommended to use

REL mode to measure for any capacitance of less than 1μF)

Overload protection: 600Vrms.

7. Frequency

Range

9.999Hz

～10.00MHz

0.001Hz～0.01MHz

Resolution

Accuracy

±(0.1%+5)

Range: Auto

Input frequency:

≤100KHz: 100mVrms≤Input frequency≤30Vrms;

＞100kHz~1MHz: 200mVrms≤Input frequency≤30Vrms;

＞1MHz: 600mVrms≤Input frequency≤30Vrms;

Overload protection: 600Vrms .

8.Diode & Buzzer Continuity Test

Range

Description

Display forward voltage of the diode under test (approximate

value) and the range scope is 0 V. ～3

If it is equal or less than 10 , the buzzer beeps, indicatingΩ

circuit is closed; if it is equal or more than 100 ，the buzzer Ω

remain silence, indicating open circuit with a voltage of

approximately 1V.

Overload protection: 600Vrms .

9. hFE Test for Transistors

Range

Description

hFE

Test Condition

It can be used to test hFE specificiations

for Transistors of NPN or PNP type.

Display range: 0-1000β

Base current is about

10μA, Vce is about

1.2V

10. Temperature Test (Only for UT890C+)

Accuracy

±3

±5

±(1.0%+3)

±(1.5%+5)

±(2.5%+5)

±(2.0%+3)

Function Range Resolution

Temperature ℃

-40

～0℃

1℃>0

～100℃

>100 0℃～100

－40～32

>32～212

>212～1832

V. How to Use it:

Instructions before operating

(1). Once the unit is powered up, please check the 9V battery

contained in this unit, and if the battery

voltage is insufficient, there will be a

symbol “ ” being displayed on the

screen, then the battery should be

replaced to ensure measurement

accuracy.

(2). The symbol “ ” located beside

the jacks for test leads warns that for

the prevention of internal circuit from

being damaged, the input voltage or

current should not exceed the rated

value.

(3). Before measuring, the range switch should be switched into the

range needed.

(4). Instrument Introduction (see Fig. 1):

(see Fig. 1)

① Combination keys: HOLD/ /SELECT(UT890C+)

② LCD

③ Combination keys: MAX MIN/

④ Range switch

⑤ Jack for transistor testing

⑥ Input Jack

1. DC Voltage Measurement

(1). Insert the black test lead into “COM”, while insert the red test

lead into “V”.

(2). Switch the range switch into the range “ ”. Then connect

the test leads in parallel with the power or load under test, the polarity

shown by the unit is the polarity of the terminal connected by the

red test lead.

Notes

1) If the voltage being measured remains unknown, turn the range

switch into the maximum range first and then gradually adjusting it

downward.

2) If “OL” is shown on the LCD, it indicates that it has exceeded the

range, so the range should be switched into a higher one.

3) The symbol “ ” besides the “V” jack indicates that no voltage

higher than 1000V should be input into the unit, as though it is

possible to display a higher voltage, but this may incur a risk of

damaging internal wiring!

4) In case the input impedance is around 10MΩ, it may result in

measurement error if such load is connected into a circuit with high

impedance. Under most circumstances, if the circuit impedance is

less than 10kΩ, then the error is ignored (0.1% or even lower).

5) Especially be cautious to avoid shock when measuring high voltage.

2. AC Voltage Measurement

(1) Insert the black test lead into “COM”, while insert the red test

lead into “V”.

Produkt Specifikationer

Mærke:	Uni-T
Kategori:	Måling
Model:	UT890C

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