UNI-T UT90D Operating Manual

Model UT90D: OPERATING MANUAL

TABLE OF CONTENTS

TITLE PAGE

Model UT90D: OPERATING MANUAL

Introduction

Dear customer,

thank you for making the excellent decision to purchase this UNI-T product.

You have acquired an above-average quality product from a brand family which has distinguished itself in the ﬁeld of measuring, charging and network technology by particular competence and permanent innovation. The

products of the UNI-T family offer optimum solutions even for the most demanding applications for ambitious

hobby

electricians as well as for professional users. UNI-T offers you reliable technology at an extraordinarily favourable cost-performance ratio. Therefore,

we are absolutely sure: Your decision for a UNI-T product is the beginning of a long and successful

cooperation.

And now enjoy your new UNI-T product!

Introductio

n..................................................................................................................................................................1

Intended us

e..............................................................................................................................................................4

Operating element

s....................................................................................................................................................5

Safety instruction

s......................................................................................................................................................6

Product descriptio

n......................................................................................................................................................9

Scope of deliver

y........................................................................................................................................................10

Display Indications and Symbol

s................................................................................................................................11

Measuring mod

e..........................................................................................................................................................12

a)Voltage measuring „V“ ......................................................................................................................................13

b)Current measuring „A“...................................................................................................................................... 14

c)Frequency measuring........................................................................................................................................16

d)Resistance measurement..................................................................................................................................17

e)Diode test..........................................................................................................................................................18

f) Continuity check................................................................................................................................................19

g)Capacity measuring ..........................................................................................................................................20

REL

∆function........................................................................................................................................................21

Low Imp. 400 k

Ω

function......................................................................................................................................21

Auto power OFF functio

n........................................................................................................................................21

Maintenance and cleanin

g........................................................................................................................................22

Genera

l..................................................................................................................................................................22

Cleanin

g..................................................................................................................................................................22

Changing the 10

Afuse..........................................................................................................................................23

Inserting/changing the batter

y................................................................................................................................24

Disposal of ﬂat batterie

s........................................................................................................................................25

Disposa

l......................................................................................................................................................................26

Troubleshooting..........................................................................................................................................................26

Technical data............................................................................................................................................................28

Model UT90D: OPERATING MANUAL

TABLE OF CONTENTS

TITLE PAGE

Model UT90D: OPERATING MANUAL

Intended Use

- Measuring and displaying electric parameters in the range of excess voltage category III (up to max. 600V against ground potential, pursuant to EN 61010-1) and all lower categories.

- Measuring direct current up to max. 1000 V (C

ATII)

- Measuring alternating current up to max. 750 V (C

ATII)

- Measurement of direct and alternating current up to 10

- Frequency measuring up to 10 MHz

- Capacity measuring up to 100 µF

- Measurement of resistance values of up to 40MOhm

- Continuity check (< 70 Ohm acoustic)

- Diode test

The

two current measuring inputs are secured against overload. The voltage in the measuring circuit may not exceed

250

V. The 10 Ameasuring range is equipped with a ﬁne fuse, the 400 mAmeasuring range with a self-resetting PTC

fuse.

The device may only be operated with the speciﬁed batteries.

The

measuring instrument must not be operated when it is open, i.e. with an open battery compartment or when the

battery

compartment cover is missing. Measuring in damp rooms or under unfavourable ambient conditions is not admissible.

For

safety reasons, when measuring only use measuring cables or accessories which are adjusted to the speciﬁca-

tions of the multimete

Unfavourable ambient conditions are:

Wetness or high air humidity

- Dust and ﬂammable gases, vapours or solvents

- thunderstorms or similar conditions such as strong electrostatic ﬁelds etc.

Any

use other than the one described above damages the product. Moreover, this involves dangers such as e.g. short circuit, ﬁre, electric shock, etc. No part of the product must be modiﬁed or rebuilt!

The safety instructions must be followed unconditionally!

Operating elements

1 Detachable rubber holster

2 LC display with connection information

3 RELbutton for relative measuring function

4 Rotary switch

5 mAµAHz measuring socket (with self-resetting fuse)

6 10 Ameasuring socket (with ﬁne-wire fuse)

7 V

Ω

capacity measuring socket (with commensurability „+“)

8 COM measuring socket (reference potential)

9 SELECTbutton for function switching

10Low imp. 400 k

Ω

button for short-time reduction of the measuring impedance from 10 MOhm to 400 kOhm

Safety instructions

Please read the entire operating instructions before using the product for the ﬁrst time; they contain important information on the correct operation. The

guarantee is rendered invalid when damage is incurred as a result of non-compliance with

the

operating instructions! We do not assume any liability for any damage arising as a consequence! We will also not assume any responsibility for damage to assets or for personal injury caused by

improper handling or failure to observe the safety instructions! The warranty is voided in these cases.

This device left the manufacture

’s factory in a safe and perfect condition. We kindly request the user to observe the safety instructions and warnings contained in this operating manual to preserve this condition and to ensure safe operation!

Please observe the following symbols:

Atriangle containing an exclamation mark indicates important information in these operating instructions which is to be observed without fail.

The triangle containing a lightning symbol warns of danger of an electric shock or of the impairment of the electrical safety of the device.

The “hand” symbol indicates special information and advice on operation of the device.

Model UT90D: OPERATING MANUAL

This product has been CE-tested and meets the necessary European guidelines.

Class 2 insulation (double or reinforced insulation)

CAT II Overvoltage category II for measurements on electric and electronic devices connected to the mains

supply with a power plug. This category also covers all smaller categories (e.g. CAT I for measuring signal and control voltages).

CAT III Overvoltage category III for measuring in building installation (e.g. outlets or sub-distribution). This cat-

egory also covers all smaller categories (e.g. C

ATII for measuring electronic devices).

Ground potential

The

unauthorised conversion and/or modiﬁcation of the unit is inadmissible because of safety and approval reasons (CE).

Consult an expert when in doubt about the operation, the safety or the connection of the device.

Measuring instruments and accessories are not toys and have no place in the hands of children.

industrial sites the accident prevention regulations of the association of the industrial workers’society for electrical equipment and utilities must be followed.

Model UT90D: OPERATING MANUAL

In schools, training centres, computer and self-help workshops, handling of measuring instruments must be supervised by trained personnel in a responsible manne

Before measuring voltages, always make sure that the measuring instrument is not set to a measuring range for currents.

The

voltage between the connection points of the measuring device and the ground potential must not exceed 600 V DC/AC in overvoltage category III or 1000 V DC/AC in overvoltage category II.

The test prods have to be removed from the measured object every time the measuring range is changed.

especially careful when dealing with voltages higher than 25V AC or 35 V DC. Even at such voltages you can receive a life-threatening electric shock when you come into contact with electric wires.

Check

the measuring device and its measuring lines for damage before each measurement. Never carry out any

measurements if the protecting insulation is defective (torn, ripped o

ff etc.)

To avoid an electric shock, make sure not to touch the connections/measuring points to be measured neither directly nor

indirectly during measurement. During measuring, do not grip beyond the tangible grip range markings present on the test prods.

not use the multimeter just before, during or just after an electrical storm (electrical shock / high-energy overvoltages!). Please make sure that your hands, your shoes, your clothing, the ﬂoor, switches and switching components are dr

Avoid an operation near:

- strong magnetic or electromagnetic ﬁelds

- transmitting aerials or HF generators.

since this could affect the measurement.

you have a reason to believe that the device can no longer be operated safely, disconnect it immediately and secure it against being operated unintentionall

y. It can be assumed that safe operation is no longer possible if:

- the device exhibits visible damage,

- the device does not operate any longer and

- the device was stored under unfavourable conditions for a long period of time or

- the device was exposed to extraordinary stress in transit.

not switch the measuring instrument on immediately after it has been taken from a cold to a warm environment.

Condensation

water that forms might destroy your device. Leave the device switched off and wait until it has reached room temperature.

not leave the packaging material lying around carelessly since such materials can become dangerous toys in the hands of children.

You should also heed the safety instructions in each chapter of these instructions.

Product Description

The multimeter (referred to as DMM in the following) indicates measured values on the digital display. The measuring value display of the DMM comprises 4000 counts (count = smallest display value).

The measuring device can be used for do-it-yourself or for professional applications.

For better readabilit

y, the DMM can also be mounted with the clip on the rear.

The

mAcurrent section shows an absolute novelty. With this measuring device, it is no longer necessary to replace an accidentally triggered m

Afuse. The installed PTC fuse resets automatically after tripping.

Rotary switch (4)

The individual measuring functions are selected using a rotary switch for which „auto

range“, the automatic range selection, is active. The appropriate range of

measurement is set for each application individuall

With

the button „SELECT“ (9), you switch to a sub-function if the measuring func-

tion

is double assigned (e.g. switching resistance measuring - diode test and con-

tinuity test or

AC/DC switching in the current range).

the rotary switch is set to „OFF“, the measuring device is switched off. Always turn the measuring device o

ff when it is not in use.

Prior to working with the measuring device, you ﬁrst have to insert the enclosed batteries. Insert

the battery as described in the chapter „Cleaning and Maintenance“. A9V block battery is required for voltage

supply. These are supplied with the device.

Contents

Multimeter with removable rubber holster 9V block battery Safety measuring cable Operating instructions

Display indications and symbols

∆ Delta symbol for relative value measuring (= reference value measuring) Auto rang

e stands for „automatic measuring range selection“

Connect termina

lGraphic notice to select the required measuring sockets

OL Overload, the measuring range was exceeded

Battery replacement symbol; please replace the batteries immediately to avoid measuring errors!

Symbol for the diode test

Symbol for the acoustic continuity tester AC Alternating size for voltage and current DC Direct magnitude for voltage and current

mV millivolt (exp.-3) V Volt (unit of electric potential) A ampere (unit of electric current) mA Milliampere (exp.-3) µA Microampere (exp.-6) Hz Hertz (unit of frequency) kH

z Kilohertz (exp.3) MH

z Megahertz (exp.6) Ω Ohm (unit of electric resistance) kΩ Kiloohm (exp.3) MΩ Megaohm (exp.6) nF Nanofarad (unit of electric capacity, exp.-9, symbol ) µF Microfarad (exp.-6)

Model UT90D: OPERATING MANUAL

Measuring

Do not exceed the maximum permitted input values. Do not contact circuits or parts of circuits

if there could be voltages higher than 25 V ACrms or 35 V DC present within them. Mortal danger!

Before measuring, check the connected measuring lines for damage such as, for example, cuts,

cracks or squeezing. Defective measuring cables must no longer be used. Mortal danger!

During

measuring, do not grip beyond the tangible grip range markings present on the test prods.

You may only connect the two measuring leads to the measuring device that are required for measuring

operation. Remove all measuring leads not required from the device for safety

reasons.

The display shows the corresponding connection sequence of the measuring sockets for each measuring function. Observe this when connecting the measuring leads to the measuring device.

As soon as „OL“ (overload) appears on the displa

y, you have exceeded the measuring range.

a) Voltage measuring „V“

Proceed as follows to measure DC voltages „DC“ (V ):

- Turn the DMM on at the rotary switch and select measuring range „V “. For lower voltages up to max. 400 mV, select the measuring range „mV

“

- Plug

the red measuring lead into the V measuring socket and the black mea-

suring lead into the COM measuring socket.

- Now

connect the two test prods to the object to be measured (battery, circuit

etc.).

-The red measuring tip indicates the positive pole, the black measuring tip the

negative pole.

- The polarity of the respective measuring value is indicated on the together with the current measuring value.

soon as a minus „-“ appears for direct voltage in front of the measured value, the measured voltage is negative (or the measuring leads have been mixed up).

The

voltage range „V DC/AC“ shows an input resistance of >10

MOhm, the „mV DC“ measuring range >4000 MOhm.

- After measuring, remove the measuring leads from the measuring object and turn the DMM off. Turn the rotary switch to „OFF“.

Proceed as follows to measure AC voltages (V ):

- Turn the DMM on at the rotary switch and select measuring range „V “.

- Plug

the red measuring lead into the V measuring socket and the black measuring lead into the COM measuring

socket.

- Now connect the two measuring prods to the object to be measured (generator, switching etc.).

- The measuring value is indicated on the display

- After measuring, remove the measuring leads from the measuring object and turn the DMM off. Turn the rotary switch to „OFF“.

Model UT90D: OPERATING MANUAL

b) Current measuring „A“

Do not exceed the maximum permitted input values. Do not contact circuits or parts of circuits if there could be voltages higher than 25 V ACrms or 35 V DC present within them. Mortal danger!

The voltage in the measuring circuit may not exceed 250 V.

Measuring

in the 10 A range may only be performed for max. 10 seconds and at 15 minute

intervals.

Current

measuring operations are possible in three ranges. The ﬁrst range is from 0 to 4000µA, the second from 0 to 400mAand the third from 0 to 10 A. All current measuring ranges are protected against overload.

The m

Ameasuring input has a self-resetting PTC fuse; fuse changes are not required.

If the mAfuse tripped (measured value does not change etc.), turn the DMM off (OFF) and wait about ﬁve minutes. The self-resetting fuse cools down and then functions again.

Proceed as follows to measure DC voltages:

- If

you want to measure currents of up to max. 4000µA, set the rotary switch to position

„µA“ or to position „mA“ respectively up to max. 400 mA or to position

„A“ for max. 10

A. The display shows „DC“.

- Plug

the red measuring lead into the 10 Ameasuring socket (with currents > 400

mA)

or into the mAµAmeasuring socket (with currents <400 mA). Plug the black

measuring lead into the COM socket.

- Now

connect the two test prods in series with the object to be measured (battery,

circuit

etc.); the display indicates the polarity of the measured value together with

the currently measured value.

As soon as a minus „-“ appears for the direct voltage measuring in front

of the measuring value, the measured voltage is negative (or

the measuring tips have been mixed up).

After

measuring, remove the measuring leads from the measuring object and turn

the DMM o

ff. Turn the rotary switch to „OFF“.

Proceed as described above to measure alternating currents.

Press „SELECT“ (9) to switch to the

AC range. „AC“ appears on the display. Pressing this button again, takes you back etc. After

measuring, remove the measuring leads from the measuring object and turn the DMM off. Turn the rotary switch

to „OFF“.

Do not measure any currents above 10 Ain the 10Arange and no currents above 400 mAin the mA/µArange, otherwise the fuses trigger.

c) Frequency measurement

The DMM can be used to measure and indicate signal voltage frequencies up to 10 MHz.

Proceed as follows to measure frequencies:

- Turn the DMM on at the rotary switch and select measuring range „Hz“. The display reads „Hz“.

- Plug

the red measuring lead into the Hz measuring socket and the black mea-

suring lead into the COM measuring socket.

- Now

connect the two test prods with the object to be measured (signal generator,

circuit etc.).

- The frequency and corresponding unit are displayed.

- After measuring, remove the measuring leads from the measuring object and turn the DMM o

ff. Turn the rotary switch to „OFF“.

d) Resistance measuring

Make sure that all the circuit parts, switches and components and other objects of measurement are disconnected from the voltage at all times.

Proceed as follows to measure the resistance:

- Turn the DMM on at the rotary switch and select measuring range „Ω“.

- Plug

the red measuring lead into the Ωmeasuring socket and the black measur-

ing lead into the COM measuring socket.

- Check

the measuring leads for continuity by connecting both measuring prods to one another. After that the resistance value must be approximately 0.5 Ohm (inherent resistance of the measuring leads).

- Press

the button „REL“ (3) to not let the inherent resistance of the measuring leads ﬂow into the following resistance measuring. The display shows 0 Ohm

- Now

connect the measuring prods to the object to be measured. As long as the

object

to be measured is not high-resistive or interrupted, the measured value will

be indicated on the display. Wait until the display has stabilised. With resis-

tances of >1 MOhm, this may take a few seconds.

- As soon as „OL“ (overload) appears on the display, you have exceeded the measuring range or the measuring circuit has been broken.

- After measuring, remove the measuring leads from the measuring object and turn the DMM off. Turn the rotary switch to „OFF“.

If you carry out a resistance measurement, make sure that the measuring points which you contact with

the measuring prods are free from dirt, oil, solderable lacquer or similar. An incorrect

measurement may result under such circumstances.

e) Diode test

Make sure that all the circuit parts, switches and components and other objects of measurement are disconnected from the voltage at all times.

-Turn the DMM on at the rotary switch and select measuring range „“.

Plug the red measuring lead into the Ωmeasuring socket and the black measuring lead into the COM measuring socket.

- To activate the function „Diode test“, press the button „SELECT“ (9). Pressing this button again takes you to the next measuring function (continuity check) etc.

The display indicates the diode symbol .

- Check

the measuring leads for continuity by connecting both measuring prods to

one anothe

r. After that the value must be approximately 0 V.

Now connect the two measuring prods with the object to be measured (diode).

- The display shows the continuity voltage in volt (V). If „OL“ is indicated, the diode is

measured in reverse direction or the diode is faulty (interruption). Perform a counter-pole measuring for control reasons.

- After measuring, remove the measuring leads from the measuring object and turn the DMM o

ff. Turn the rotary switch to „OFF“.

f) Continuity check

Make sure that all the circuit parts, switches and components and other objects of measurement are disconnected from the voltage and discharged.

- Turn the DMM on at the rotary switch and select measuring range

- Plug

the red measuring lead into the Ωmeasuring socket and the black measur-

ing lead into the COM measuring socket.

- To activate the acoustic continuity test function, press the button „SELECT“ (9). Pressing

this button again takes you back to the ﬁrst measuring function (resis-

tance measuring) etc.

- The display indicates the symbol „Continuity test“ .

- Ameasuring value of less than 70 Ohm is identiﬁed as continuity; in this case a beep sounds.

Apermanent beep sounds as of <10 Ohm.

- As soon as „OL“ (overload) appears on the display, you have exceeded the measuring range or the measuring circuit has been broken.

- After measuring, remove the measuring leads from the measuring object and turn the DMM off. Turn the rotary switch to „OFF“.

Model UT90D: OPERATING MANUAL

g) Capacity measuring

Make sure that all the circuit parts, switches and components and other objects of measurement are disconnected from the voltage and discharged.

With electrolyte capacitors, observe the polarity.

- Turn the DMM on at the rotary switch and select measuring range

- Plug the red measuring lead into the V measuring socket and the black measuring lead into the COM measuring socket.

- The display shows the unit „nF“.

Due to the sensitive measuring input, the display may show a value in

case of „open“ measuring leads. By pressing the button „REL∆“,

the display is set to „0“.

- Now

connect the two test prods (red = positive pole/black = negative pole) with

the

object to be measured (condenser). After a short while the display shows the capacity. Wait until the display has stabilised. With capacities of >40 µF, this may take a few seconds.

- As soon as „OL“ (overload) appears on the display, you have exceeded the measuring range.

- After measuring, remove the measuring leads from the measuring object and turn the DMM o

ff. Turn the rotary switch to „OFF“.

REL∆function

The RELfunction allows a reference value measurement to avoid possible line losses which may caused e.g. during resistance measurements. For this purpose, the current indicated value is set to zero. Anew reference value is set.

Press the „REL

∆“ button to activate this measuring function. The display shows „∆“. The automatic measuring range

selection is deactivated no

To turn this function off, keep the button „REL∆“ depressed until „∆“ goes off.

Low Imp. 400 kΩfunction

This function may only be used for voltages of a max. of 250 V and a max. of 3 seconds!

This measuring function enables the reduction of the measuring impedance from 10 MW to 400 kW. Through the reduction

of the measuring impedance, possible phantom voltages are suppressed, which could falsify the measuring result. Press this button during voltage measurement (max. 250 V) for a max. of 3 seconds. After release, the multimeter has the normal measuring impedance of 10 M

Ω.

Auto power OFF function

The DMM turns off automatically after 30 minutes if no button or switch is operated. This function saves battery power and extends the service life.

To reactivate the DMM after automatic shutdown, use the rotary switch or press the „REL“ or „SELECT“ button.

You can turn the auto power-off function manually.

To do so, turn the measuring device off (OFF). Keep the button „SELECT“ depressed and turn the DMM on at the rotary switch.

This function remains inactive until the measuring device is turned off via the rotary switch.

Maintenance and cleaning

General information

To ensure the accuracy of the multimeter over an extended period of time, it should be calibrated once a year. Apart from occasional cleaning and fuse replacements, the multimeter requires no servicing. Information on changing the battery and fuse appears belo

Regularly check the technical safety of the instrument and measuring lines, e.g. check for damage to the housing or squeezing etc.

Cleaning

Always observe the following safety instructions before cleaning the device:

Live components may be exposed if covers are opened or parts are removed (unless this can be done without tools). The

connected lines must be disconnected from the measuring device and all measuring

objects prior to cleaning or repairing the device. Switch the DMM off.

not use any carbon-containing cleaning agents or petrol, alcohol or the like to clean the product. These could cor-

rode

the surface of the measuring instrument. The fumes are furthermore a health hazard and are explosive. More-

ove

r, you should not use sharp-edged tools, screwdrivers or metal brushes or similar for cleaning.

For cleaning the device or the display and the measuring lines, use a clean, fuzz-free, antistatic slightly damp cloth.

Changing the 10 Afuse

The 10 Ameasuring range is protected against overload with a standard ﬁne-wire fuse. If measuring in this range is no longer possible, you have to change the fuse.

Proceed as follows for replacement

- Separate

the connected measuring leads from the measuring circuit and the measuring device. Switch the DMM off.

- Slide the rubber holster o

ff the device.

- Unscrew the three screws on the back of the device and carefully pull the casing apart.

- Replace

the defective fuse with a new fuse of the same type and nominal voltage. The fuse has the following values:

Fine-wire fuse, quick-action, 10A/ 250 V (5 x 20 mm) Common name F10A250V.

- Now close the casing carefull

y. Replace the rubber holster on the device.

Using mended fuses or bridging the fuse holder is not admissible for safety reasons. Never operate the measurement device when it is open. !RISK OF

FATALINJURY!

Inserting/changing the batteries

Operation of the measuring device requires a 9V battery (1604A). You need to insert a new, charged battery prior to initial operation or when the battery change symbol

appears on the display.

To insert/replace the battery, proceed as follows:

- Separate

the connected measuring leads from the measuring circuit and the measuring device. Switch the DMM off.

- Slide the rubber holster o

ff the device.

- Unscrew the three screws on the back of the device and carefully pull the casing apart.

- Connect a new battery with the battery clip in the DMM observing the right polarit

- Now close the casing carefull

Never operate the measuring instrument when it is open. !RISK OF

FATALINJURY!

Do not leave ﬂat batteries in the appliance. Even batteries protected against leaking can corrode

and thus release chemicals which may be detrimental to your health or damage the appliance.

not leave batteries lying around carelessly. They might be swallowed by children or pets. If swallowed, consult a doctor immediatel

Remove the batteries if the device is not used for longer periods of time to prevent leaking.

Leaking

or damaged batteries may cause alkali burns if they come in contact with the skin. Therefore, use suitable protective gloves.

Make sure that the batteries are not short-circuited. Do not throw batteries into ﬁre!

Batteries may not be recharged. There could be danger of explosion.

You can order suitable alkaline batteries stating the following order no.: Order no.: 65 25 09 (please order 1). Only use alkaline batteries, since these are powerful and have a long life.

Disposal of ﬂat batteries

You, as the end customer, are legally obliged (Battery Ordinance) to return all used batteries and accumulators. Disposal in the household waste is prohibited!

Contaminated batteries/rechargeable batteries are labelled with these symbols to indicate that disposal in

domestic waste is forbidden. The description of dangerous heavy metal constituents are: Cd =

Cadmium,Hg

= Mercury, Pb= Lead. Vous pouvez rapporter gratuitement vos piles et accumulateurs usagés aux centres de récupération de votre commune, à nos succursales ou à tous les points de vente de piles et d’accumulateur

You thereby meet the legal obligations and contribute to the protection of the environment!

Disposal

Old electronic devices are hazardous waste and should not be disposed of in the household waste. When

the device has become unusable, dispose of it in accordance with the current statutory

regulations at the communal collection points. It is forbidden to dispose of it in the household waste.

Troubleshooting

In purchasing the DMM, you have acquired a product which has been designed to the state of the art and is operationally reliable. Nevertheless, problems or faults may occu

For this reason, the following is a description of how you can eliminate possible malfunctions yourself.

Please always observe the safety instructions!

Error Possible cause Remedy

The multimeter

Is the battery dead? Check the status. does not work.

None measuring

Is the wrong measuring function active Check the display (AC/DC) value change. (AC/DC)? and switch the function if applicable.

Did you use the wrong measuring sockets?

Compare the connection with the

display.

Is the fuse defect

? In mA/µA range: Turn the measuring

device o

ff and wait approx. 5 minutes until the PTC fuse is reset automatically. In the 10

Arange: Change the fuse as described in the chapter „Changing the fuse“.

Repairs other than those described should only be carried out by an authorised specialist. If you have queries about handling the measuring device, our technical support is available under the following telephone number:

Model UT90D: OPERATING MANUAL

Technical data

Display 4000 counts Measuring frequenc

y approx. 2-3 measuring operations/second Measuring lead length about 75 cm each Measuring impedanc

e >10MΩ(V range) Operating voltage 9-V compound battery Working temperature 0°C to 40°C Operating height max. 2,000 m Storage temperatur

e -10°C to +50°C Weight ca. 340 g Dimensions (LxWxH

) 177 x 85 x 40 (mm)

Over-voltage categor

y CATIII 600 V (incl. CATII 1000 V)

Measurement tolerances

Statement of accuracy in ±(% of reading + display error in counts (= number of smallest points)). The accuracy is valid for one year at a temperature of +23°C

±5°C, and at a relative humidity of less than 75 %, non-condensing.

Direct voltage, overload protection 1000 V

Range Accuracy Resolution 400 mV ±(0,8% + 3) 0.1 mV 4 V 1 mV 40 V ±(0,8% + 1) 10 mV 400 V 100 mV 1000

V ±(1% + 3) 1 V

Alternating voltage, overload protection 750 V

Range (40-400 Hz) Accuracy Resolution 4 V ±(1,2% + 5) 1 mV 40 V

±(1% + 5)

10 mV 400 V 100 mV 600

V ±(1,2% + 5) 1 V

Direct current, overload protection 400 mA/250V + 10

A/250 V

Range Accuracy Resolution 400 µA

±(1% + 2)

0,1 µA 4,000 µA 1 µA 40 mA

±(1.2% + 3)

10 µA 400 mA 100 µA 4 A

±(1.5% + 5)

1 mA 10

A 10 mA

Alternating current, overload protection 400mA/250V + 10 A/250 V

Range (40-400 Hz) Accuracy Resolution 400 µA

±(1.5% + 5)

0,1 µA 4000 µA 1 µA 40 mA

±(2% + 5)

10 µA 400mA 100 µA 4 A

±(2.5% + 5)

1 mA 10

A 10 mA

Resistance, overload protection 1000V/DC or 750V/AC

Range Accuracy Resolution 400 Ω ±(1,2% + 2) 0,1 Ω 4 KΩ 1 Ω 40 KΩ ±(1% + 2) 10 Ω 400 KΩ 100 Ω 4 MΩ ±(1,2% + 2) 1 kΩ 40 M

Ω ±(1.5% + 2) 10 KΩ

Capacit

y, overload protection 1000V/DC or 750V/AC Range Accuracy Resolution 40 nF ±(3% + 10) 0.01 nF 400 n

F 0.1 nF 4 µF ±(3% + 5) 1 nF 40 µF 0.01 µF 100 µ

F ±(4% + 5) 0.1 µF

Frequenc

y, overload protection 250 V

Range Accuracy Resolution 10 Hz - 10 MH

z 0,01 Hz - 0,01 MHz

max. 30

Vrms Sensitivity:

±(0,1% + 3)

< 1 MHz = 300 mV > 1 MHz = 600 mV

Acoustic continuity teste

r <70 Ω(<10 Ωpermanent beep)

Diode test test voltage:

1.48V / test voltage ca.1 mA

Diode overload protection/continuity tester:1000V/DC or 750V/AC

Do not exceed the maximum permitted input values. Do not touch any circuits or parts of circuits, if they can have higher voltages than 25 V

Acrms or 35 V DC. Mortal danger!

Manufacturer: Uni-

Trend Technology (Dongguan) Limited Dong Fang Da Dao Bei Shan Dong Fang Industrial Development District Hu Men

Town, Dongguan City Guang Dong Province China Postal Code: 523 925

Headquarters: Uni-Trend Group Limited 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

UNI-T UT90D Operating Manual

Specifications and Main Features

Frequently Asked Questions

User Manual