General DMM333 User manual

DMM333
USER’S MANUAL
DIGITAL POCKET
MULTIMETER -
AUTO RANGING

2
TITLE PAGE
INSTRUMENT..........................3
OVERVIEW
FEATURES ...............................4
SPECIFICATIONS....................5-6
SAFETY COMPLIANCE .........7
SAFETY ....................................8-15
INFORMATION
ELECTRICAL ...........................16
SYMBOLS
OPERATING............................. 17-25
INSTRUCTIONS
MAINTENANCE ......................26
TABLE OF CONTENTS

INSTRUMENT OVERVIEW
1. LCD Display
2. Function Select Button
3. Rotary Switch
4. DATA/MAX HOLD Button
5. Test Leads
DMM333
3

FEATURES
• Data Hold, Max Hold Ranging
• Easy to use
• Continuity Beeper, Diode Test
• Auto Power Off
• Low Battery Indicator
• Fast Sampling Rate
• Built-In-Test Leads
4

5
GENERAL SPECIFICATIONS
FUNCTIONS DMM333
Auto Ranging auto
Display Count 2000
DC Volts Auto 200mV/2/20/
200/500VDC
DC Volts ±(0.5%+5dgt)
Accuracy
AC Volt Auto
2/20/200/500VAC
AC Volts ±(0.8%+5dgt)
Accuracy
Resistance Auto 200/2k/20k/
(Ohms) 200k/2M/20MΩ
Resistance ±(0.8%+5dgt)<1MΩ,
Accuracy ±(2%+5dgt)≥1MΩ
Diode Test •
Continuity •
(audible)
DC Amps
200µ/2000µA/20m/200mADC
DC Amps ±(1.8%+5dgt)
Accuracy
AC Amps
200µ/2000µA/20m/200mAAC
AC Amps ±(1.8%+5dgt)
Accuracy

6
GENERAL SPECIFICATIONS
FUNCTIONS
Input
Impedance
(DCV setting)
Auto Off
Data Hold
Max Data
Hold
Fuse
Battery Type
Operating
Temperature
Storage
Temperature
Size(L×W×H)
Weight
(including
batteries)
DMM333
10MΩ
•
•
•
250mA 250V
Fast Fuse
2 “LR44” 1.5V
button cell batteries
32° to 140°F
(0°to 40°C) ≤75%RH
14° to 122°F
(-10° to 50°C)
≤75% RH
Approx
4.5" x 2.3" x .5"
(115 x 58 x 12mm)
Approx
3oz (84g)

7
SAFETY COMPLIANCE
Note: Accuracy is given for
one year at 73.4°±5.4°F (23°±3°C)
RH<75%
This unit was designed to be
safe at least under the
following conditions:
•Indoor use
•Altitude: up to 2000m
•Pollution degree: 2
•Ingress protection degree: IP20
•Test leads type: CE, CAT II 500V
and CAT III 300V,1A
•Safety Compliance: IEC61010-1,
2001 CAT II 500V and
CAT III 300V

8
SAFETY INFORMATION
To avoid electric shock
or injury:
• Do not perform the performance
tests or adjustment procedures
described in this manual unless
you are qualified to do so.
• The information provided in this
manual is for the use of qualified
personnel only.
• Read “Safety Information” before
using this meter.
• This multimeter is battery
operated, with a digital display.
• The Meter complies with
IEC61010-1，2001 CATII 500V
and CATIII 300V. Refer to
“General Specifications” for
more information.

9
SAFETY INFORMATION
(continued)
• In this manual, a Warning
identifies conditions and actions
that pose hazards to the user.
• A Caution identifies conditions
and actions that may damage the
Meter or the equipment under test.
International symbols used on the
Meter and in this manual are
explained in Table 1 on page 16.

10
To avoid possible electric shock
or personal injury, and to avoid
possible damage to the Meter
or to the equipment under test,
comply with the following
practices:
1. Do not use the Meter in a
manner not specified by this
manual or the safety features
of the Meter may be impaired.
2. Before using the Meter, inspect
the case. Do not use the Meter
if it is damaged. Look for cracks
or missing plastic. Pay particular
attention to the insulation
around the connectors.
3.
Inspect the test leads for
damaged insulation or exposed

11
metal. Check the test leads for
continuity. Replace damaged
test leads before using the Meter.
Only test leads meeting CE,
CAT II 500V and CAT III 300V 1A
can be used in this multimeter.
Replacing test leads should be
referred to qualified service
personnel only.
4. Verify a Meter’s operation by
measuring a known voltage.
Do not use the Meter if it
operates abnormally. Protection
may be impaired. When in doubt,
have the Meter serviced.
5.
Do not apply more than the
rated voltage, as marked on the
Meter, between the terminals
or between any terminal and
earth ground.
9

12
6.
Do not measure voltages above
500 V in Category II, or 300 V
in Category III installations.
7.
Do not measure voltage when
the function/range switch is set
on the resistance (ohms) or the
current (µA/mA) settings. Never
measure current when the meter
is set on the resistance range.
Never measure AC voltage
when the meter is set on DC
voltage or DC current settings.
Setting the meter on the incorrect
function may burn out some of
the internal circuitry and may
pose a safety hazard.
8. Use caution when working with
voltages above 30 V ac rms,
42 V AC peak, or 60 V DC.
These voltages pose a shock
hazard.

13
9. Use the proper terminals,
function, and range for all
measurements.
10.
Do not operate the Meter around
explosive gas, vapor, or dust.
11.
When using the probes, keep
the fingers behind the finger
guards. Do not touch the metal
probes of the test leads when
making a measurement.
12.When making connections,
connect the common test lead
before connecting the live test
lead; when disconnecting,
disconnect the live test lead
before disconnecting the
common test lead
13.Disconnect circuit power and
discharge all high-voltage

14
capacitors before testing
resistance, continuity, diodes,
or capacitance.
14.For all DC functions, to avoid
the risk of shock due to possible
improper reading, verify the
presence of any AC voltages by
first using the AC function. Then
select a DC voltage range equal
to or greater than the AC range.
15.Before measuring current, you
should turn off power to the
circuit before connecting the
Meter to circuit.
16.Do not operate the Meter with
the case (or part of the case)
removed.
17.Use only two 1.5V button cell
batteries, properly installed in

15
the Meter case, to power the
Meter.
18.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.
Don’t replace batteries with the
wrong type. Otherwise, you may
encounter hazards!
19.Remove test leads from the
circuit under test before opening
the Meter case.
20.When servicing the Meter, use
only specified replacement parts.

16
TABLE 1.
ELECTRICAL SYMBOLS
SYMBOL DESCRIPTION
AC (Alternating
Current)
DC (Direct Current)
Caution, risk of
electric shock
Hazardous voltage
Battery (Low battery
when shown on the
display).
Diode
AC or DC
Fuse
Double
Insulated
Risk of danger.
Important
Information.
Refer to the manual.
Earth ground
Continuity/Buzzer
Complies with EU
directives

17
OPERATING INSTRUCTIONS
• Data Hold and Max Hold
Press the “H” (Hold) button
to hold present reading, and
press the “M” (Max Hold)
button to hold max reading.
• DC Voltage Measurement
Do not measure voltage higher
than 500V. If the voltage is over
1000 VDC, the beeper will
sound for warning continuously,
designating an over-range
measurement.
1.Set the function/range switch to
the appropriate DC voltage range.
2.Touch the black test lead to the
negative polarity, and touch the
red test lead to positive polarity
of the circuit to be tested.

18
3.Read the measured voltage on
the display. If the test leads are
reversed, the “
— ” indicator will
appear on the display.
red test lead
black test lead
red test lead
black
test lead

19
• AC Voltage Measurement
Do not measure voltage higher
than 500V. It may make damage
to internal circuit. If the voltage is
over 750 VAC, the beeper will
sound for warning continuously,
designating an over-range
measurement.
1.Set the function/range switch to
the appropriate AC voltage range.
2.Measure the voltage by touching
the probes to the desired test
points of the circuit. With AC
voltage, the polarity of the test
leads is not a factor.
3.Read the
measured
voltage on
the display.
red
test lead
black
test lead

20
• Resistance
Measurement (Ω)
To avoid electrical shock or
damage to the meter when
measuring resistance or continuity
in a circuit, make sure the power
to the circuit is turned off and all
capacitors are discharged.
1.Turn the rotary switch to the
appropriate resistance (ohms)
range. Make sure power is
disconnected from the circuit
to be measured.
2.Measure the resistance by
touching the probes to the
desired test points of the circuit.
3.Read the measured resistance
on the display. When the
resistance value is over range,