Unit UT70C Manuale utente
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Table of Contents
Title
Overview
Unpacking Inspection
Safety Information
Rules For Safe Operation
International Electrical Symbols
The Meter Structure
Rotary Switch
Functional Buttons
Display Symbols
Measurement Ranges
A. Selecting a Measurement Range
B. Manual Ranging and Autoranging
Measurement Operation
A. AC Voltage Measurement
B. DC Voltage Measurement
C. DC Milivolt Measurement
D. Measuring Continuity, Resistance,
Conductance & Capacitance
E. Testing Diodes
F. DC or AC Current Measurement
G. Frequency & Duty Cycle Measurement
MAX MIN Recording Mode
PEAK MAX MIN Mode
Operation of Hold Mode
Operation of Auto Hold Mode
The Use of Relative Value and Relative
Percentage Value Mode
Turning on the Display Backlight
Analogue Bar Graph Display
Full Icons Display
Sleep Mode
General Specifications
Model UT70C: OPERATING MANUAL
1
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Accuracy Specifications
A. AC Voltage
B. DC Voltage
C. Continuity, Resistance &
Conductance Test
D. Capacitance
E. Diodes Test
F. DC Current
G. AC Current
H. Frequency & Duty Cycle
Maintenance
A. General Service
B. Testing the Fuses
C. Replacing the Battery
D. Replacing the Fuses
RS232C Serial Port
A. RS232C Port Cable
B. Setting of RS232C Serial Ports
C. System Requirements for Installing the
UT70C Interface Program
Model UT70C: OPERATING MANUAL
2
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.
Your multimeter is an intelligent digital one, a precise
instrument with a resolution of 8,000 counts and up-to-
date automatic computer calibrating function. High
resolution A/D converter and micro-controller data
processing technique is adopted in the Meter, featured
with intelligence, high precision and multi-functions. The
Meter can be widely used in laboratory, field service,
domestic and other applications. All the functions and
ranges have overloaded protection.
Model UT70C: OPERATING MANUAL
3
Unpacking Inspection
Open the package case and take out the Meter. Check
the following items carefully to see any missing or
damaged part:
In the event you find any missing or damage, please
contact your dealer immediately.
Item
1
2
3
4
5
6
7
8
Description
Operating Manual
Test Lead
Test Clip
9V Battery (NEDA1604, 6F22 or 006P)
(installed)
RS232C Interface Cable
CD-ROM (Installation Guide & Computer
Interface Software)
Holster
Tilt Stand
Qty
1 piece
1 pair
1 pair
1 piece
1 piece
1 piece
1 piece
1 piece
Model UT70C: OPERATING MANUAL
4
Safety Information
CAT. II: Local level, appliance, PORTABLE EQUIPMENT
etc., with smaller transient voltage overvoltages than
CAT. III
CAT. III: Distribution level, fixed installation, with smaller
transient overvoltages than CAT. IV
CAT IV: Primary supply level, overhead lines,
cablesystems etc.
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 on.
International electrical symbols used on the Meter and
in this Operating Manual are explained on page 8.
Model UT70C: OPERATING MANUAL
5
CE Version: The Meter complies with the standards
IEC61010-1:in pollution degree 2, overvoltage category
CAT III 1000V, CAT IV 600V and double insulation .
ULVersion: The Meter complies with the standards UL61010B-1,
in pollution degree 2, overvoltage category CAT II 1000V
and double insulation.
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.
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 Never working at an effective voltage over 60V
in DC or 30V rms in AC 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.
Model UT70C: OPERATING MANUAL
6
Rules For Safe Operation (2)
l Disconnect circuit power and discharge all high-
voltage capacitors before testing resistance,
conductance, continuity, diodes, current, or
capacitance.
l Before measuring current, check the Meter's
fuses and turn off power to the circuit before
connecting the Meter to the circuit.
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 Remove test leads, RS232C interface cable and
test clip from the Meter and turn the Meter power
off before opening the Meter case.
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 off the Meter 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.
Model UT70C: OPERATING MANUAL
7
International Electrical Symbols
The Meter Structure (see figure 1)
(figure 1)
1 Front Case
2 LCD Display
3 Functional Buttons
4 Rotary Switch
5 Input Terminals
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
Model UT70C: OPERATING MANUAL
8
mV
V
OFF
V
Rotary Switch
Below table indicated for information about the rotary
switch positions.
Rotary
Switch
Position
Function
Power is turned off.
AC voltage measurement.
DC voltage measurement.
DC millivolt measurement.
:Continuity test.
: Resistance measurement.
:Capacitance test.
Diode Test.
AC or DC Current Measurement
from 0.001A to 10.00A .
AC or DC Current Measurement
from 0.1mA to 800.0mA.
A
mA
Model UT70C: OPERATING MANUAL
9
Functional Buttons (1)
Below table indicated for information about the functional
button operations.
Button Operation PerformedMeasuring
Function
Continuity
Test Turn the continuity buzzer on and
off in resistance measurement
mode.
At OFF
position
At REC
mode or
REC mode
plus Hold
mode
Press while turning on the
Meter to disable the beeper at all
functions except short circuit and
diode testing.
To toggle between 100ms
response time and 1ms response
time under REC mode except at
resistance, capacitance and
continuity range.
MAX
MIN Any rotary
switch
position
except at
conductance
mode.
Starts recording of maximum and
minimum values. Steps the
display through the sequence of
present, high (MAX), low (MIN)
and average (AVG) readings at
any mode.
In 1ms response time, it steps
through only MAX and MIN
reading.
At OFF
position To select 1 second high accuracy
response time, press and hold
down MAX MIN while turning the
rotary switch to any function
setting.
RANGEAny rotary
switch
position
1. Press RANGE to enter the
manual ranging mode; the
Meter beeps.
2. Press RANGE to step
through the ranges available
for the selected function; the
Meter beeps.
3. Press and hold RANGE for
over 1 second to return to
autoranging; the Meter
beeps.
Model UT70C: OPERATING MANUAL
10
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