This multimeter has been designed according to IEC 1010
concerning electronic measuring instruments with an overvoltage
category (CAT II) and pollution 2. Follow all safety and operating
instructions to ensure that the meter is used safely and is kept in
good operating condition. Full compliance with safety standards
can be guaranteed only with test leads supplied. If necessary, they
must be replaced with the type specied in this manual.
SAFETY SYMBOLS
Important safety information, refer to the operating manual.
Dangerous voltage may be present.
Earth ground.
Double insulation (Protection class II).
Fuse must be replaced with rating specied in the manual.
200mA/250V
MAINTENANCE
• Before opening the case, always disconnect test leads from all
energized circuits.
• For continue protection against re; replace fuse only with the
specied voltage and current ratings: F 200mA/250V(Quick
Acting)
• Never use the meter unless the back cover is in place and
fastened completely.
• Do not use abrasives or solvents on the meter. To clean it using
a damp cloth and mild detergent only.
2
Page 3
DURING USE
• Never exceed the protection limit values indicated in specications for each range of measurement.
• When the meter is linked to measurement circuit, do not touch
unused terminals.
• Never use the meter to measure voltages that might exceed
600V above earth ground in category II installations.
• When the value scale to be measured is unknown beforehand,
set the range selector at the highest position.
• Before rotating the range selector to change functions, disconnect test leads from the circuit under test.
• When carrying out measurements on TV or switching power
circuits always remember that there may be high amplitude voltages pulses at test points, which can damage the meter.
• Always is careful when working with voltages above 60V dc
or 30V ac rms. Keep ngers behind the probe barriers while
measuring.
• Before attempting to insert transistors for testing, always be sure
that test leads have been disconnected from any measurement
circuits.
• Components should not be connected to the hFE socket when
making voltage measurements with test leads.
• Never perform resistance measurements on live circuits.
GENERAL DESCRIPTION
The meter is a handheld 3 1/2 digital multimeter for measuring DC
and AC voltage, DC current, Resistance, Diode, Transistor and
Continuity Test with battery operated.
DC Current A••••
Resistance Ω••••
Diode••••
Transistor hFE test••••
Continuity•••
Temperature ºC•
HOLD••••
BACK LIGHT•
1
4
2
3
5
6
4
7
Page 5
FRONT PANEL DESCRIPTION
Display
1
3 1/2 digit, 7 segment, 15mm high LCD.
Back light (option)
2
When this button is pushed, the Back light of display is on. After
about 5 seconds, the Back light is self-off. The Back light is on
again, just push this button once.
3
Rotary switch
This switch is used to select functions and desired ranges as
well as to turn on/off the meter.
4
Hold button
When this button is pushed, the display will keep the last reading
and " " symbol will appear on the LCD until pushing it again.
5
"
10A" jack
Plug in connector for red test lead for 10A measurement.
"
COM" jack
Plug in connector for black (negative) test lead. "VΩmA" jack
6
7
Plug in connector for red (positive) test lead for voltage, resistance and current (except 10A) measurements.
SPECIFICATIONS
Accuracy is specied for a period of one year after calibration and
at 18 to 28°C(64°F to 82°F) with relative humidity to 80%.
GENERAL
Maximum voltage between
terminals and earth ground : CAT II 600V
Fuse protection : F 200mA/250V
Power : 9V battery, NEDA 1604 or 6F22
Display : LCD, 1999 counts, updates 2-3/sec.
Measuring method : Dual-slope integration A/D converter
Overrange Indication : Only gure "1" on the display
Polarity indication : "-" displayed for negative polarity
Operating Environment : 0 to 40ºC
Storage temperature : -10ºC to 50ºC.
Low battery indication : " " appears on the display
Size : 138mm×69mm×31mm
Weight : Approx.170g.
5
Page 6
DC VOLTAGE
RangeResolutionAccuracy
200mV100µV±0.5% of rdg ± 2 digits
2V1mV±0.5% of rdg ± 2 digits
20V10mV±0.5% of rdg ± 2 digits
200V100mV±0.5% of rdg ± 2 digits
600V1V±0.8% of rdg ± 2 digits
Overload Protection: 250V rms. For 200mV range and 600V dc
or rms. ac for other ranges.
DC CURRENT
RangeResolutionAccuracy
200µA0.1µA±1% of rdg ± 2 digits
2mA1µA±1% of rdg ± 2 digits
20mA10µA±1% of rdg ± 2 digits
200mA100µA±1.5% of rdg ± 2 digits
10A10mA±3% of rdg ± 2 digits
Overload Protection: F 200mA/250V fuse. (10A range unfused)
*303-150NCS DC 200µA Excepted
AC VOLTAGE
RangeResolutionAccuracy
200V100mV ±1.2% of rdg ± 10 digits
2600V1V±1.2% of rdg ± 10 digits
Overload Protection: 600V dc or rms. ac for all ranges.
Frequency range: 40Hz to 400Hz. Response: Average respond-
ing, calibrated in rms. of a sine wave.
DIODE & CONTINUITY(*903-150NAS Excepted)
RangeDescription
If continuity exists (about less than 1.5kΩ), built-in buzzer
will sound.
Show the approx. forward voltage drop of the diode.
6
Page 7
Overload Protection: 250V dc or rms. ac.
RESISTANCE
RangeResolutionAccuracy
200Ω0.1Ω±0.8% of rdg ± 3 digits
2kΩ1Ω±0.8% of rdg ± 2 digits
20kΩ10Ω±0.8% of rdg ± 2 digits
200kΩ100Ω±0.8% of rdg ± 2 digits
2MΩ1kΩ±1.0% of rdg ± 2 digits
Maximum Open Circuit Voltage: 3.2V
Overload Protection: 250V dc or rms. ac for all ranges.
TRANSISTOR hFE TEST (0-1000)
RangeTest RangeTest CurrentTest Voltage
NPN & PNP0-1000Ib=10µAVce=3V
TEMPERATURE (For 303-150NCS only)
RangeResolutionTest RangeAccuracy
ºC1ºC
-20ºC to 0ºC
-0ºC to 400ºC
400ºC to 1000ºC
±1.0% of rdg ± 2 digits
±1.0% of rdg ± 3 digits
±2.0% of rdg
TEMPERATURE (For 303-150NCS only)
RangeResolutionTest RangeAccuracy
ºF1ºF
-4ºF to 32ºF
32ºF to 752ºF
752ºF to 1832ºF
±10% of rdg ± 2 digits
±1.0% of rdg ± 3 digits
±2.0% of rdg
OPERATING INSTRUCTIONS DC VOLTAGE MEASUREMENT
1. Connect the red test lead to the "V.Ω.mA" jack and the black
lead to the "COM" jack.
2. Set rotary switch at desired DCV position. If the voltage to be
measured is not known beforehand, set range switch at the
highest range position and then reduce it until satisfactory
resolution is obtained.
3. Connect test leads across the source or load being measured.
4. Read voltage value on the LCD display along with the polarity of
the red lead connection.
7
Page 8
DC CURRENT MEASUREMENT
1. Connect the red test lead to the "V.Ω.mA" jack and the black
test lead to "COM" jack. (For measurements between 200mA
and 10A, remove red lead to "10A" jack.)
2. Set the rotary switch at desired DCA position.
3. Open the circuit in which the current is to be measured, and
connect test leads in series with the circuit.
4. Read current value on LCD display along with the polarity of red
lead connection.
AC VOLTAGE MEASUREMENT
1. Connect the red test lead to "V.Ω. mA" jack and the black test
lead to the "COM" jack.
2. Set the rotary switch at desired ACV position.
3. Connect test leads across the source or load being measured.
4. Read voltage value on the LCD display.
RESISTANCE MEASUREMENT
1. Connect the red test lead to "V. Ω. mA" jack and black test lead
to the "COM" jack. (The polarity of red lead is positive "+".)
2. Set the rotary switch at desired "Ω" range position.
3. Connect test leads across the resistor to be measured and read
LCD display.
4. If the resistance being measured is connected to a circuit turn
off power and discharge all capacitors before applying test
probes.
DIODE TEST
1. Connect the red test lead to "V.Ω.mA" jack and the black test
lead to the "COM" jack (The polarity of red lead is positive "+".).
2. Set the rotary switch at " " position.
3. Connect the red test lead to the anode of the diode to be tested
and the black test lead to the cathode of the diode. The approx.
forward voltage drop of the diode will be displayed. If the con-
nection is reversed, only gure "1" will be shown.
8
Page 9
TRANSISTOR TEST
1. Set the rotary switch at "hFE" position.
2. Determine whether the transistor under testing is NPN or PNP
and locate the emitter base and collector leads. Insert the leads
into proper holes of the hFE socket on the front panel.
3. Read the approximate hFE value at the test condition of base
current 10µA and Vce 3V.
NOTE:
To avoid electrical shock, remove test leads from measurement
circuits before testing a transistor.
AUDIBLE CONTINUITY TEST
1. Connect red test lead to "V.Ω.mA", black test lead to “COM”.
2. Set range switch to " " position.
3. Connect test leads to two points of circuit to be tested. If continuity exists, built-in buzzer will sound.
MEASURING TEMPERATURE
1. If the meter is the ºC function, set the rotary switch at ºC. Position. If it is the ºF function, set the rotary switch at ºF Position.
The LCD display will show the current environment temperature.
2. Connect the red lead of "K" type thermocouple into the
"V.Ω.mA" jack and the black lead of "K" type thermocouple into
the "COM" jack.
3. Read temperature value on the LCD display.
WARNING
To avoid electric shock, be sure the thermocouple has been
removed before changing to another function measurement.
9
Page 10
BATTERY & FUSE REPLACEMENT
If " " appears on display, it indicates that the battery should
be replaced.
Fuse rarely need replacement and blow almost always as a
result of operator’s error.
To replace battery & fuse (200mA/250V) remove the 2 screws
in the bottom of the case. Simply remove the old, and replace
with a new one.
Be careful to observe battery polarity.
WARNING
Before attempting to open the case, always be sure that test
leads have been disconnected from measurement circuits.
Close case and tighten screws completely before using the
meter to avoid electrical shock hazard.