Unit UT256A Manual de usuario

200A AC Fork Meter

UT256A

P/N:110401109062X

Preface

Thank you for purchasing the new fork meter. In order to use

this product safely and correctly, please read this manual

thoroughly, especially the Safety Instructions part.

After reading this manual, it is recommended to keep the

manual at an easily accessible place, preferably close to

the device, for future reference.

Limited Warranty and Liability

Uni-Trend guarantees that the product is free from any defect

in material and workmanship within one year from the purchase

date. This warranty does not apply to damage caused by

accident, negligence, misuse, modification, contamination

or improper handling. The dealer shall not be entitled to give

any other warranty on behalf of Uni-Trend. If you need

warranty service within the warranty period, please contact

your seller directly.

Uni-Trend will not be responsible for any special, indirect,

incidental or subsequent damage or loss caused by using

this device.

UT256A User Manual

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I. Overview

The UT256A is a stable, safe and reliable 6000-count AC fork

meter. It measures AC current via the fork, AC/DC voltage

(up to 1000V), resistance, and continuity via test leads, and

can detect the presence of AC voltage via the non-contact

voltage (NCV) sensor. It has data hold, auto/manual range,

LCD backlight, audio/visual alarm, and flashlight functions.

The full-scale overload protection and unique appearance

design make it a special electrical meter with superior

performance.

II. Accessories

Open the package box and take out the meter. Please double

check whether the following items are missing or damaged.

1. User manual ----------------------------------------------- 1 pc

2. Test leads 1 pair ---------------------------------------------------

3. Cloth bag 1 pc ----------------------------------------------------

4. 2 pcs 1.5V AA batteries (preinstalled into meter) ---------

If any of the above is missing or damaged, please contact

your supplier immediately.

I. Overview -------------------------------------- 4

II. Accessories ---------------------------------- 4

III. Safety Instructions ------------------------ 5

IV. Electrical Symbols ------------------------- 7

V. External Structure -------------------------- 8

VI. LCD Display -------------------------------- 9

VII. Function Buttons ------------------------ 10

VIII. Operating Instructions ----------------- 11

IX. Specifications ---------------------------- 17

X. Maintenance ------------------------------- 22

Table of Contents

UT256A User Manual UT256A User Manual UT256A User Manual UT256A User Manual

III. Safety Instructions

The meter is designed according to IEC/EN61010-1, IEC/

EN61010-2-033 and EN61326-1 safety standards, and

conforms to CAT II 1000V, CAT III 600V, double insulation,

and pollution degree 2. Use the meter only as specified, or

the protection provided by the meter may be impaired.

1. Before use, please check if there is any item which is

damaged or behaving abnormally. If any abnormal item

(such as bare test lead, damaged meter casing, broken

LCD, etc.) is found, or if the meter is considered to be

malfunctioning, please do not use the meter.

2. Do not use the meter if the rear cover or battery cover is

not covered up, or it will pose a shock hazard!

3. Before each use, verify meter operation by measuring a

known voltage.

4. When using the meter, keep fingers behind the finger

guards of the test leads, and do not touch exposed wires,

connectors, unused inputs, or circuits being measured to

prevent electric shock.

5. Place the function switch in the correct position before

measurement. It is forbidden to change the position during

measurement.

6. Do not apply more than the rated voltage, as marked on

the meter, between any meter terminal and earth ground

to prevent electric shock or damage to the meter.

7. Use caution when working with voltages above AC 30Vrms,

42Vpeak or DC 60V. Such voltages pose a shock hazard.

8. Never input a voltage or current which exceeds the specified

limit. If the range of the measured value is unknown, the

maximum range should be selected.

9. Before measuring the resistance and continuity online,

switch off the power supply of the circuit, and fully discharge

all capacitors to avoid inaccurate measurement.

10. When the “ ” symbol appears on the LCD, please

replace the batteries in time to ensure measurement

accuracy. If the meter is not in use for a long time, please

remove the batteries.

11. Do not change the internal circuit of the meter to avoid

damage to the meter or user!

12. Do not use or store the meter in high temperature, high

humidity, flammable, explosive or strong magnetic field

environments.

13. Clean the meter casing with a soft cloth and mild detergent.

Do not use abrasives or solvents!

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V. External Structure (Picture 1)

1. NCV sensor

2. Open jaw fork

3. Flashlight LED light

4. Hand guard

5. alarm indicatorVisual NCV

6. Function switch

7. LCD display

8. Function buttons

9. Signal input jack (red and positive +)

10.COM input jack (black and negative -)

Picture 1

IV. Electrical Symbols

Description

Direct current

Alternating current

Earth (ground) TERMINAL

Equipment protected throughout by DOUBLE INSULATION

or REINFORCED INSULATION

Caution, possibility of electric shock

Warning or Caution

Application around and removal from UNINSULATED

HAZARDOUS LIVE conductors is permitted.

Conforms to UL STD 61010-1, 61010-2-032, 61010-2-033.

Certified to CSA STD C22.2 No. 61010-1,

61010-2-032, 61010-2-033.

Complies with European Union standards

It is applicable to testing and measuring circuits

connected directly to utilization points (socket outlets and

similar points) of the low-voltage MAINS installation.

It is applicable to testing and measuring circuits

connected to the distribution part of the building's

low-voltage MAINS installation.

CAT II

CAT III

Symbol

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VII. Function Buttons

1.SELECT button: When the function switch is in the composite

function position, short press this button to switch between

the corresponding functions.

2.H/ button: Short press this button to enable/disable the

data hold function. Long press (>2s) this button to turn

on/off the flashlight.

3.RANGE button: Short press this button to enter the manual

range mode (no “Auto” displayed) and change the range

in this mode. Long press this button to exit the manual

range mode. Turn the function switch or restart the meter

to restore default settings.

4. button: Short press this button to turn on/off the backlight.

Description

Warning sign, indicating AC voltage >35V

and DC voltage >50V

Data hold

Negative reading

Continuity test

Low battery indication

AC/DC measurement

Auto range

Resistance units (ohm, kilo-ohm, meg-ohm)

Voltage unit (volt)

Current unit (ampere)

Frequency unit (hertz)

Auto power off

Non-contact voltage sensing

Symbol

AC/DC

Auto

Ω, kΩ, MΩ

NCV

VI. LCD Display (Picture 2)

Picture 2

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VIII. Operating Instructions

1. AC Current/Frequency Measurement (Picture 3)

1) Turn the function switch to the position, and use the

SELECT button to switch to AC current/frequency

measurement.

2) Clamp one current-carrying wire and keep it at the bottom

of the U-type open jaw fork.

3) Read the measured value on the display (frequency

response: 50Hz~60Hz).

Picture 3

Caution:

Disconnect the test leads when measuring current to avoid

electric shock.

Do not place any part of your body beyond the hand guard

of the meter when measuring current.

The maximum measuring current cannot exceed AC 200A.

2. AC Voltage/Frequency Measurement (Picture 4)

1) Turn the function switch to the position, and use the

SELECT button to switch to AC voltage/frequency

measurement.

2) Insert the red test lead into the signal input jack, black

into the COM input jack, and make the probes in contact

with both ends of the measured object (part).

3) Read the measured value on the display.

Red Black

Picture 4

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3. DC Voltage Measurement (Picture 5)

1) Turn the function switch to the position.

2) Insert the red test lead into the signal input jack, black into

the COM input jack, and make the probes in contact with

both ends of the measured object (part).

3) Read the measured value on the display.

Picture 5

Red Black

Caution:

Maximum measuring voltage: 1000V (AC/DC voltage)

under CAT II, 600V (AC/DC voltage) under CAT III,

ACV: 45Hz~400Hz.

Do not exceed the limits, otherwise there may be danger

of electric shock or damage to the meter (If the LCD displays

“OL”, it indicates that the voltage is over range).

The input impedance of the meter is 10MΩ. This load effect

may cause measurement errors when measuring high-

impedance circuits. If the measured impedance is

≤ ≤ 10kΩ, the error can be ignored ( 0.1%).

Be cautious to avoid electric shock when measuring high

voltages.

Before each use, verify meter operation by measuring a

known voltage.

4. Continuity/Resistance Measurement (Picture 6)

1) Turn the function switch to the position, and use the

SELECT button to switch to continuity/resistance

measurement.

2) Insert the red test lead into the signal input jack, black into

the COM input jack, and make the probes in contact with

both ends of the measured object (part).

3) Read the measured value on the display.

Picture 6

Red Black

Continuity

Resistance

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Caution:

Do not input voltages higher than DC 60V or AC 30V to

avoid personal injury.

Before measuring the resistance online, switch off the power

supply of the circuit, and fully discharge all capacitors to

ensure accurate measurement.

If the resistance is >0.5Ω when the test leads are short-

circuited, please check the test leads for looseness or other

abnormalities.

If the measured resistor is open or the resistance exceeds

the maximum range, the LCD will display “OL”.

Measurement result = displayed value – resistance of

shorted test leads

5. Non-contact Voltage (NCV) Sensing (Picture 7)

1) Turn the function switch to the NCV position, and use the

SELECT button to switch to high voltage measurement

(“EFHI”) or low voltage measurement (“EFLo”). When the

voltage is >48V, select “EFHI”; when the voltage is <48V,

select “EFLo”.

2) Bring the NCV sensor close to the charged AC wire under

test. As the intensity of the detected voltage increases, the

more the segments (“—”, “— —”, “— — —” or “— — — —”)

are displayed, the more frequently the buzzer beeps and

the indicator flashes. When the voltage is sensed in EFLo

mode, the indicator blinks in green, and when the voltage

is sensed in EFHI mode, the indicator blinks in yellow until

it turns red.

Picture 7

Caution:

If the distance between the NCV sensor and AC wire is

different, the intensity sensed will vary.

Frequency of the detected voltage: 50Hz~60Hz

NCV sensing is not used as a basis for touch. Use the test

leads for contact measurement to determine whether the

voltage is safe before touch to prevent electric shock.

6. Others

1) Auto power off: During measurement, if there is no operation

of the function switch or any button for 15 minutes, the

meter will automatically shut down to save power. Users

can wake it up by pressing any button or restart it after

turning the function switch to the OFF position.

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To disable the function, press and hold the auto power off

button in the off state, and then turn on the SELECT

buzzer will make five consecutive beeps. To meter. The

auto power off function, restart the meter.resume the

About 1 minute before auto power off, the buzzer will make

five consecutive beeps. If there is no operation within the 1

minute, the meter will automatically shut down accompanied

by one long beep.

2) Buzzer: When any button is pressed or the function switch

is turned, if it is valid, the buzzer will make one beep (two

short beeps indicating invalid button operation). In the

voltage or current measurement, the buzzer will beep

continuously to indicate the over range.

IX. Specifications

1. General Specifications

a. Max display: 6000 counts

b. Polarity display: Auto

c. Overload display: “OL” or “-OL”

d. Low battery indication: The “ ” symbol is displayed.

e. Test position error: If the measured source is not placed

in the measurement position of the open jaw fork in

measuring current, an error or erroneous reading will be

produced.

f. Drop protection: 2m

g. Jaw opening: 15mm

h. Battery: 2×1.5V AA batteries

i. Auto power off: 15 minutes (can be disabled)

j . Dimensions: 220mm×58.5mm×38mm

k. Weight: About 260g (including batteries)

l. Operating altitude: ≤2000m

m. Operating temperature and humidity: 0°C~30°C (≤80%RH),

30°C~40°C (≤75%RH), 40°C~50°C (≤45%RH)

n. Storage temperature and humidity: -20°C~60°C (≤80%RH)

o. Electromagnetic compatibility: RF=1V/m, overall accuracy

= specified accuracy + 5% of range; RF>1V/m, not specified

2. Electrical specifications

a. Accuracy: ± (a% of reading + b digits), 1 year calibration

cycle

b. Ambient temperature and humidity: 23°C±5°C; ≤80%RH

Caution:

To ensure measurement accuracy, the operating temperature

should be within 18°C~28°C and the fluctuation range should

be within ±1°C. When the temperature is <18°C or >28°C,

add temperature coefficient error 0.1 x (specified accuracy)/°C.

UT256A User Manual UT256A User Manual

17 18

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