Ut201 PDF

Model UT201/202: OPERATING MANUAL
Table of Contents
Title Page
Overview 3
Unpacking Inspection 4
Safety Information 5
Rules For Safe Operation 6
International Electrical Symbols 8
The Meter Structure 9
Rotary Switch 10
Functional Buttons 11
The Effectiveness of Functional Buttons 12
Display Symbols 13
Measurement Operation 15
A. DC Voltage Measurement 15
B. AC Voltage Measurement 16
C. Measuring Resistance 17
D. Testing Diodes 19
E. Testing for Continuity 20
F. Temperature Measurement 22
G. AC Current Measurement 23
Sleep Mode 25
Specifications 26
A. General Specifications 26
B. Environmental Restriction 26
Accuracy Specifications 27
A. AC Voltage 27
B. DC Voltage 27
C. Resistance 28
D. Continuity Test 28
E. Diode Test 28
F. Temperature 29
G. AC Current 29
Maintenance 30
A. General Service 30
B. Replacing the Battery 30
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Overview
This Operating Manual covers information on safety

and cautions. Please read the relevant information
carefully and observe all the Warnings and Notes strictly.
Warning
To avoid electric shock or personal injury, read the
“Safety Information” and “Rules for Safe Operation”
carefully before using the Meter.
Digital Multimeter Model UT201/202 (hereafter referred

to as “the Meter”) are 3 1/2 digits with steady operations,
fashionable structure and highly reliable measuring
instrument. The Meter uses large scale of integrated circuit
with double integrated A/D converter as its core and has
full range overload protection.
The Meter can measure AC/DC Voltage, AC Current,

Resistance, Temperature( oF/ oC), Diodes, Continuity
and so on.

Unpacking Inspection
Open the package case and take out the Meter. Check
the following items carefully to see any missing or damaged
part:
Item Description Qty

1 English Operating Manual 1 piece
2 Test Lead 1 pair
3 Point Contact Temperature Probe 1 piece
(UT202 only)
4 1.5V Battery (AAA) 2 pieces
In the event you find any missing or damage, please

contact your dealer immediately.

Safety Information
This Meter complies with the standards IEC61010: in

pollution degree 2, overvoltage category (CAT. II 600V,
CAT. III 300V) and double insulation.
CAT. II: Local level, appliance, PORTABLE EQUIPMENT

etc., with smaller transient overvoltages than CAT. III.
CAT. III: Distribution level, fixed installation, with smaller
transient overvoltages than CAT. IV
Use the Meter only as specified in this operating manual,

otherwise the protection provided by the Meter may be
impaired.
In this manual, a Warning identifies conditions and

actions that pose hazards to the user, or may damage
the Meter or the equipment under test.
A Note identifies the information that user should pay

attention to.
International electrical symbols used on the Meter and

in this Operating Manual are explained on page 8.

Rules For Safe Operation (1)
Warning
To avoid possible electric shock or personal injury,
and to avoid possible damage to the Meter or to the
equipment under test, adhere to the following rules:
l Before using the Meter inspect the case. Do not

use the Meter if it is damaged or the case (or part
of the case) is removed. Look for cracks or
missing plastic. Pay attention to the insulation
around the connectors.
l Inspect the test leads for damaged insulation
or exposed metal. Check the test leads for
continuity. Replace damaged test leads with
identical model number or electrical specifications
before using the Meter.
l Do not apply more than the rated voltage, as
marked on the Meter, between the terminals or
between any terminal and grounding. If the value
to be measured is unknown, use the maximum
measurement position and reduce the range step
by step until a satisfactory reading is obtained.
l When measurement has been completed, disconnect
the connection between the test leads and the
circuit under test, remove the testing leads away
from the input terminals of the Meter and turn
the Meter power off.
l The rotary switch should be placed in the right
position and no any changeover of range shall
be made during measurement is conducted to
prevent damage of the Meter.
l Do not carry out the measurement when the
Meter’s back case and battery compartment are
not closed to avoid electric shock.
l Do not input higher than 600V between the Meter’s
terminals and the grounding to avoid electric
shock and damages to the Meter.

Rules For Safe Operation (2)

l When the Meter working at an effective voltage
over 60V in DC or 30V rms in AC, special care
should be taken for there is danger of electric
shock.
l Use the proper terminals, function, and range
for your measurements.
l Do not use or store the Meter in an environment
of high temperature, humidity, explosive,
inflammable and strong magnetic field. The
performance of the Meter may deteriorate after
dampened.
l When using the test leads, keep your fingers
behind the finger guards.
l Disconnect circuit power and discharge all high
-voltage capacitors before testing resistance,
continuity and diode.
l Replace the battery as soon as the battery indicator
appears. With a low battery, the Meter might
produce false readings that can lead to electric
shock and personal injury.
l When servicing the Meter, use only the same
model number or identical electrical specifications
replacement parts.
l The internal circuit of the Meter shall not be altered
at will to avoid damage of the Meter and any
accident.
l Soft cloth and mild detergent should be used to
clean the surface of the Meter when servicing.
No abrasive and solvent should be used to
prevent the surface of the Meter from corrosion,
damage and accident.
l The Meter is suitable for indoor use.
l Turn the Meter off when it is not in use and take
out the battery when not using for a long time.
l Constantly check the battery as it may leak when
it has been using for some time, replace the
battery as soon as leaking appears. A leaking
battery will damage the Meter.

International Electrical Symbols
AC (Alternating Current).
DC (Direct Current).
AC or DC.
Grounding.
Double Insulated.
Deficiency of Built-In Battery
Continuity Test.
Diode.
Capacitance Test
Fuse.
Warning. Refer to the Operating Manual.
Conforms to Standards of European Union.

The Meter Structure (see figure 1)
( figure 1)
1. Input Terminals
2. LCD Display
3. Functional Buttons
4. Rotary Switch
5. Trigger: press the lever to open the transformer jaws.
When the pressure on the lever is released, the jaws
will close.
6. Hand Guards: to protect user’s hand from touching
the dangerous area.
7. Transformer Jaws: designed to pick up the AC current
flowing through the conductor. It could transfer current
to voltage.

Rotary Switch
Below table indicated for information about the rotary switch
positions.
Rotary Function
Switch
Position
OFF Power is turned off.
AC/DC voltage measurement.
: Diode test.
: Continuity test.
Ω Ω : Resistance measurement.
o o Temperature measurement
CF (UT202 only)
AC current measurement range from 0.001A

A
to 400.0A
10

Functional Buttons(1)
Below table indicated for information about the functional
button operations.
AC voltage measurement.
l Press HOLD to enter and exit the
HOLD
Hold mode in any mode, the Meter beeps.
l Press and hold HOLD button
while turning on the Meter to display
full icons.
MAX Press MAX to start recording and updating
of maximum values.
SELECT Press SELECT button to switch between
Ω o o
and C F .
11

The Effectiveness of Functional Buttons

Not every functional buttons can be used on every rotary
switch positions. Below two tables describe which functional
buttons can be used on which rotary switch positions
Model: UT201
Rotary Switch
Positions Functional Buttons
SELECT MAX HOLD
V N/A
V N/A
Ω N/A N/A
N/A
A 2/20A N/A
A 200/400A N/A
Model: UT202
Rotary Switch
Positions Functional Buttons
SELECT MAX HOLD
V N/A
V N/A
Ω N/A
o o
F C(K-Type) N/A
A 2/20A N/A
A 200/400A N/A
12

Display Symbols(1) (see figure 2)
No. Symbol Meaning

1 AC Indicator for AC voltage or current
2 DC Indicator for DC voltage
The battery is low.
Warning: To avoid false readings,
3 which could lead to possible electric
shock or personal injury, replace
the battery as soon as the battery
indicator appears.
The Meter is in the auto range mode
4 in which the Meter automatically selects
the range with the best resolution.
5 Test of diode.
6 The continuity buzzer is on.
7 MAX Maximum reading displayed
8 Date hold is active.
9 o o
CF The unit of temperature:
o
C: Centigrade temperature
o
F: Fahrenheit temperature
Ω: Ohm. The unit of resistance.
3
10 Ω,kΩ,MΩ kΩ: kilohm.1 x 10 or 10006
ohms.
MΩ: Megaohm. 1 x 10 or
1,000,000 ohms.
13

Display Symbols(2) (see figure 2)

No. Symbol Meaning
11 A Amperes (amps). The unit of current.
12 mV, V Volts. The unit of voltage.mV: Millivolt.
1x10-3 or 0.001 volts
13 Indicates negative reading
14 OL The input value is too large for the
selected range
14

Measurement Operation(1)
A. DC Voltage Measurement (see figure 3)
red black
( figure 3)
Warning
To avoid harms to you or damages to the Meter from
eletric shock, do not attempt to measure voltages
higher than 600V AC/DC, although readings may be
obtained.
The DC Voltage ranges are:
200.0mV, 2.000V, 20.00V, 200.0V and 600V.
To measure DC voltage, connect the Meter as follows:
1. Insert the red test lead into the VΩ terminal

and the black test lead into the COM terminal.
2. Set the rotary switch to V .
3. Connect the test leads across with the object being
measured.
The measured value shows on the display.
Note
l In each range, the Meter has an input impedance of
10MΩ. This loading effect can cause measurement
errors in high impedance circuits. If the circuit impedance
is less than or equal to 10kΩ, the error is negligible
(0.1 or less).
15

l When DC voltage measurement has been completed,
disconnect the connection between the testing leads
and the circuit under test and remove testing leads
from the input terminals.
B. AC Voltage Measurement (see figure 4)
red black
( figure 4)
Warning
To avoid harms to you or damages to the Meter from
eletric shock, do not attempt to measure voltages
higher than 600V AC/DC, although readings may be
obtained.
The AC Voltage ranges are:
2.000V, 20.00V, 200.0V and 600V.
To measure AC voltage, connect the Meter as follows:

1. Insert the red test lead into the VΩ terminal
and the black test lead into the COM terminal.
2. Set the rotary switch to V
measured.
16

Note
l In each range, the Meter has an input impedance of
10MΩ. This loading effect can cause measurement
errors in high impedance circuits. If the circuit impedance
is less than or equal to 10kΩ, the error is negligible
(0.1 or less).
l When AC voltage measurement has been completed,
and the circuit under test and remove testing leads
from the input terminals.
C.Measuring Resistance (see figure 5)
red black
( figure 5)
Warning
To avoid harms to you, do not attempt to input voltages
higher than 60V DC or 30V rms AC.
To avoid damages to the Meter or to the devices

under test, disconnect circuit power and discharge
all the high-voltage capacitors before measuring
resistance.
17

The resistance ranges are:
200.0 , 2.000k , 20.00k ,200k ,2.000M and 20.00M .
To measure resistance, connect the Meter as follows:

1. Insert the red test lead into the V terminal and
the black test lead into the COM terminal.
2. Set the rotary switch to ; resistance measurement
( ) is default or press SELECT button to select
measurement mode.
measured.
Note:
The test leads can add 0.1Ω to 0.3Ω of error to resistance
measurement.
l For high-resistance measurement (>1M ), it is normal
taking several seconds to obtain a stable reading.
l If reading with shorted test leads is not 0.5 , check
for loose test leads, wrong function selected, or enabled
data hold function.
l The LCD displays OL indicating open-circuit or the tested
resistor value is higher than the maximum range of the
Meter.
l Resistance measurement is default to auto range mode.
l To remove the objects being tested from the circuit when
measuring can obtain a more accurate result.
l When resistance measurement has been completed,
and the circuit under test and remove testing leads from
the input terminals.
18

D.Testing Diodes (see figure 6)
red black
( figure 6)
Warning
To avoid damages to the Meter or to the devices under
test, disconnect circuit power and discharge all the
high-voltage capacitors before testing diodes.
Use the diode test to check diodes, transistors, and other

semiconductor devices. The diode test sends a current
through the semicondutor junction, then measure the
voltage drop across the junction. A good silicon junction
drops between 0.5V and 0.8V.
To test the diode out of a circuit, connect the Meter as

follows:
1. Insert the red test lead into the VΩ terminal and
2. Set the rotary switch toΩ and press SELECT
button to select measurement mode.
3. For forward voltage drop readings on any semiconductor
component, place the red test lead on the component’s
anode and place the black test lead on the component’s
cathode.
19

Note
l In a circuit, a good diode should still produce a forward
voltage drop reading of 0.5V to 0.8; however, the
reverse voltage drop reading can vary depending
on the resistance of other pathways between the
probe tips.
l Connect the test leads to the proper terminals as
said above to avoid error display.
l The LCD will display OL indicating either open circuit
or wrong polarity connection.
l The unit of diode is volt (V), displaying the forward
voltage drop readings.
l To remove the objects being tested from the circuit
when measuring can obtain a more accurate result.
l When diode testing has been completed, disconnect
the connection between the testing leads and the
circuit under test and remove testing leads from the
input terminals.
E.Testing for Continuity (see figure 7)
red black
( figure 7)
20

Warning
To avoid damages to the Meter or to the devices under
test, disconnect circuit power and discharge all the
high-voltage capacitors before measuring continuity.
To test for continuity, connect the Meter as follows:
1. Insert the red test lead into the VΩ terminal and
2. Set the rotary switch to Ω and press SELECT
button to select measurement mode.
3. The buzzer sounds if the resistance of a circuit under
test is less than 50 Ω .
4. The buzzer may or may not sounds if the resistance
of a circuit under test is between 50 Ω to 120 Ω .
5. The buzzer does not sound if the resistance of a circuit
under test is higher than 120Ω.
Note
l The buzzer beeps once when pressing any buttons
at any rotary switch positions except at 2/20A positions
if the button is valid. If the button is not valid, it does
not beep. At 2/20A rotary switch position, the buzzer
is set not to beep.
l The buzzer beeps 5 times continuously on around
1 minute before entering the sleep mode. When it
is just before entering the sleep mode, it will have
one long beep to warn you.
l The LCD displays OL indicating the circuit being
tested is open.
l When continuity testing has been completed, disconnect
the connection between the testing leads and the
circuit under test and remove testing leads from the
input terminals.
21

F. Temperature Measurement (UT202 Only)
(see figure 8)
red black
( figure 8)
o o
The temperature measurement ranges are -40 C~1000 C
o o
and -40 F~1832 F.
To measure temperature, connect the Meter as follows:

1. Insert the red temperature probe into the VΩ
terminal and the black temperature probe into the COM
terminal.
o o
2. Set the rotary switch to F C and press SELECT button
o o o
to select F or C measurement mode. C measurement
mode is default.
3. Place the temperature probe to the object being measured.
Note
l The Meter automatically displays the temperature
value inside the Meter when there is no temperature
probe connection.
l When temperature measurement has been completed,
disconnect the connection between the temperature
probe and the circuit under test, and remove the
temperature probe away from the input terminals of
the Meter.
22

G. AC Current Measurement (see figure 9)
( figure 9)
Warning
To avoid electric shock, never measure current while
the test leads are inserted into the input terminals
and disconnect test leads and tested circuit connection.
Never attempt an in-circuit current measuremnet

where the open-circuit voltage between the circuit
and the ground is greater than 600V
Use proper function and range for the measurement.

The measuremnet ranges of current are: 2.000A, 20.00A,
200.0A and 400A.
To measure current, do the following:

1. Set the rotary switch to 2/20A or 200/400 A
2. Press the lever to open the transformer jaws.
3. Center the conductor within the transformer jaw.
The measured value shows on the display, it is a
effective value of sine wave (mean value response).
23

Note:
l To obtain accurate reading, measure only one
conductor at each time.
l When current measurement has been completed,
disconnect the connection between the conductor
under test and the jaw, and remove the conductor
away from the transformer jaw of the Meter.
24

Sleep Mode
To preserve battery life, the Meter automatically turns
off if you do not turn the rotary switch or press any button
for around 15 minutes.
The Meter can be activated by turning the rotary switch

or pressing any button with the following conditions:
1) When the Meter is entered Sleep Mode at temperature

functions of Model: UT202, the Meter cannot be
activated by turning the rotary switch to AC current
ranges.
2) By pressing any button must be according to”The
Effectiveness of Functional Buttons” on page 12
3) The Hold function will be cancelled if the Meter is

activated by pressing the HOLD button.
To disable the Sleep Mode function, press and hold

HOLD button while turning on the Meter.
25

Specifications
A.General Specifications:
l Maximum voltage including transient overvoltage
between any terminals and grounding: 500V rms.
l Display: 3 1/2 digits LCD display, Maximum display 1999
l Auto Polarity Display
l Overloading : Display OL or –OL
l Battery Deficiency : Display
l Measurement Speed : Updates 3 times/second.
l Measuremnet Deviation : When the conductor being
meaured is not placed in a
correct position during AC
current measurement, it will
cause 1% reading deviation.
l Drop Test : 1 meter drop test passed.
l Max. Jaw Size : 28mm diameter.
l Projected Max.
Current conductor size : 26mm diameter.
l Power : 2pcs of 1.5V battery (AAA)
l Battery Life : typically 150hours (alkaline
battery)
l Sleep Mode (can be disabled)
l Dimensions (H x W x L) : 30mm x 76mm x 208mm.
Weight : Approximate 260g (battery
included)
B.Environmental Restrictions:
l The Meter is suitable for indoor use.
l Altitude : Operating: 2000m
Storage: 10000m
l Safety/ Compliances : IEC 61010 CAT.II 600V,
CAT.III 300V over voltage
and double insulation standard.
l Temperature and humidity:
o o
Operating: 0 C~30 C ( 75%
o o
R.H);30 C~40 C ( 70%R.H);
o o
40 C~50 C ( 45%R.H);
o o
Storage: -20 C~+60 C
( 75%R.H)
26

Accurate Specifications(1)
Accuracy: (a% reading + b digits), guarantee for 1 year.
o o
Operating temperature: 23 C 5 C
Relative humidity: 75%R.H
o
Temperature coefficient: 0.1x(specified accuracy)/1 C
A. AC Voltage: Auto ranging
Range Resolution Accuracy Overload

Protection
2.000V 1mV
20.00V 10mV (1.2%+5) 600V rms
200.0V 100mV
600V 1V (1.5%+5)
Remarks:
l Input impedance: 10MΩ //<100pF”
l Displays effective value of sine wave (mean value
response).
l Frequency response: 40Hz~1kHz.
l To adjust reading in accordance with effective value
B. DC Voltage: Auto ranging

Protection
200.0mV 0.1mV (0.8%+3)
2.000V 1mV 600V rms
20.00V 10mV (0.8%+1)
200.0V 100mV
600V 1V (1%+3)
Remarks: Input impedance: 10MΩ .
27

C. Resistance: Auto ranging

Protection
200.0Ω 100mΩ (1.2%+2)
2.000kΩ 1Ω
20.00kΩ 10Ω (1%+2) 600Vp
200.0kΩ 100Ω
2.000MΩ 1kΩ (1.2%+2)
20.00MΩ 10kΩ (1.5%+2)
Remarks: Input impedance: 10MΩ .
D. Continuity Test
Protection
Around 600Vp50Ω the
100mΩ buzzer beeps
Remark:
l Open circuit voltage approximate 0.45V.
l The buzzer may or may not beeps when the resistance
of a circuit under test is between 50Ω and 120Ω
The buzzer may not beep when the resistance of a
circuit under test is greater than 120Ω.
E. Diode Test
Protection
Display approximate
1mV forward voltage drop 600Vp
: 0.5V~0.8V
Remarks: Open circuit voltage approximate 1.48V.
28

F. Temperature (UT202 Only):

Protection
o
-40~0 C:
(3%+4)
o
-40~1000 C
o
1C
o
0~400 C:
(1%+3)
o
400~1000 C:
(2%+10) 600Vp
o
-40~32 F:
o
(3%+8)
o o o o
-40 F~1832 F 1F 32 F~752 F:
(1%+6)
o o
752 F~1832 F:
(2%+18)
G. AC Current: Auto ranging

Range Resolution Accuracy Frequency Overload
Response Protection
<1A(4%+40)
2.000A 0.001A
1A(3%+30)
(3%+12) 50Hz~60Hz 400A rms
20.00A 0.01A 4A
(2%+8)
200.0A 0.1A
400A 1A (1.5%+5)
Remarks:
l Displays effective value of sine wave (mean value
response).
To adjust reading in accordance with effective value
29

MAINTENANCE(1)
This section provides basic maintenance information
including battery replacement instruction.
Warning
Do not attempt to repair or service your Meter unless
you are qualified to do so and have the relevant
calibration, performance test, and service information.
To avoid electrical shock or damage to the Meter, do

not get water inside the case.
A. General Service
l Periodically wipe the case with a damp cloth and mild

detergent. Do not use abrasives or solvents.
l To clean the terminals with cotton bar with detergent,
as dirt or moisture in the terminals can affect readings.
l Turn the Meter power off when it is not in use.
l Take out the battery when it is not using for a long time.
l Do not use or store the Meter in a place of humidity,
high temperature, explosive, inflammable and strong
magnetic field.
B. Replacing the Battery (see figure 10)
Screw
( figure 10)
30

MAINTENANCE(2)
Warning
To avoid false readings, which could lead to possible
electric shock or personal injury, replace the battery
as soon as the battery indicator “ ” appears.
Make sure the transformer jaw and the tets leads are
disconected from the circuit being tested before
opening the case bottom.
To replace the battery:.

1. Turn the Meter off and remove all the connections
from the input terminals
2. Turn the Meter’s case top down.
3. Remove the screw from the battery compartment,
and separate the battery compartment from the case
bottom.
4. Remove the old battery from the battery compartment.
5. Replace the battery with 2pcs of new 1.5V (AAA)
battery.
6. Rejoin the case bottom and the battery compartment,
and reinstall the screw.
** END **
This operating manual is subject to change without notice.
31

Copyright 2001 Uni-Trend Group Limited.

All rights reserved.
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
32

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Model UT201/202: OPERATING MANUAL

Downloaded from www.Manualslib.com manuals search engine

Downloaded from www.Manualslib.com manuals search engine

This Operating Manual covers information on safety

Digital Multimeter Model UT201/202 (hereafter referred

The Meter can measure AC/DC Voltage, AC Current,

Downloaded from www.Manualslib.com manuals search engine

Item Description Qty

In the event you find any missing or damage, please

Downloaded from www.Manualslib.com manuals search engine

This Meter complies with the standards IEC61010: in

CAT. II: Local level, appliance, PORTABLE EQUIPMENT

Use the Meter only as specified in this operating manual,

In this manual, a Warning identifies conditions and

A Note identifies the information that user should pay

International electrical symbols used on the Meter and

Downloaded from www.Manualslib.com manuals search engine

Rules For Safe Operation (1)

l Before using the Meter inspect the case. Do not

Downloaded from www.Manualslib.com manuals search engine

Rules For Safe Operation (2)

Downloaded from www.Manualslib.com manuals search engine

International Electrical Symbols

Downloaded from www.Manualslib.com manuals search engine

The Meter Structure (see figure 1)

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AC current measurement range from 0.001A

Downloaded from www.Manualslib.com manuals search engine

Downloaded from www.Manualslib.com manuals search engine

The Effectiveness of Functional Buttons

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Display Symbols(1) (see figure 2)

No. Symbol Meaning

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Display Symbols(2) (see figure 2)

Downloaded from www.Manualslib.com manuals search engine

To measure DC voltage, connect the Meter as follows:

1. Insert the red test lead into the VΩ terminal

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B. AC Voltage Measurement (see figure 4)

To measure AC voltage, connect the Meter as follows:

Downloaded from www.Manualslib.com manuals search engine

C.Measuring Resistance (see figure 5)

To avoid damages to the Meter or to the devices

Downloaded from www.Manualslib.com manuals search engine

To measure resistance, connect the Meter as follows:

Downloaded from www.Manualslib.com manuals search engine

Use the diode test to check diodes, transistors, and other

To test the diode out of a circuit, connect the Meter as

Downloaded from www.Manualslib.com manuals search engine

E.Testing for Continuity (see figure 7)

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Downloaded from www.Manualslib.com manuals search engine

To measure temperature, connect the Meter as follows:

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Never attempt an in-circuit current measuremnet

Use proper function and range for the measurement.

To measure current, do the following:

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