73303
User’s
CAUTION
Manual
Model 73301/ 02/ 03
Digital Multimeters
Store this manual in a safe place for
future reference.
IM 73301E
6th Edition: Jan. 2007(KP)
User Calibration Function
It is recommended that the instrument be calibrated periodically.
Use the keys on the faceplate of 733 series of multimeters to carry out calibration.
Use the calibrator with ten times the accuracy of 733 series.
CAUTION
•Connect the calibrator to the multimeter with the calibrator’s testing leads.
•Before carrying out calibration, read the instruction manual of the calibrator.
•Calibration temperature and humidity: 23±3°C, 55%RH or below
•Leave the multimeter for 30 minutes to enable it to reach room temperature before
carrying out calibration.
•Temporarily remove the testing leads from the multimeter before switching between
DC and AC, or voltage and current during calibration.
To calibrate the multimeter:
Note: Start calibration of the mV range (calibration of other ranges will become possible after
mV calibration has been completed).
a) Turn the function switch from the OFF position to the mV position while pressing the SE-
LECT and RANGE keys at the same time. (The display shows the CAL symbol then the
PASS symbol.)
b) Press the SELECT key. (The display shows the “- “ symbol.)
c) Press the D-H/A-H key twice. (The display shows the “- - - “ symbol.)
d) Press the RANGE key. (The display shows the mV symbol.)
e) Connect the multimeter to the calibrator with the testing leads.
f) Set the calibrator to 380 mVDC as an input to the multimeter.
g) Press the D-H/A-H key.
(After the value stabilizes, press the D-H/A-H key to confirm the calibration value.)
h) Carry out calibration of other ranges by repeating steps f) and g) in accordance to Table 1.
i) To quit calibration, turn the function switch back to the OFF position.
Table 1. Input Signal for Calibration
Range Input Range Input Range Input
400 mVDC 380 mV 400 µADC 380 µA 10 nF 9 nF
4 VDC 3.8 V 4000 µADC 3800 µA 100 nF 90 nF
40 VDC 38 V 40 mADC 38 mA 1 µF 0.9 µF
400 VDC 380 V 400 mADC 380 mA 10 µF9 µF
1000 VDC 1000 V 4 ADC 3.8 A 100 µF 90 µF
VAC (RMS) 3.8 V at 60 Hz
VAC (AVG) 3.8 V at 60 Hz AAC 38 mA at 60 Hz
10 ADC 10 A 1000 µF 1000 µF
Safety Precautions
To ensure safe use of the product, strictly adhere to the precautions indicated by the following
symbols throughout this manual.
WARNING
Indicates a hazard that may result in the loss of life or serious injury of
the user unless the described instruction is abided by.
Indicates a hazard that may result in an injury to the user and/or physical
CAUTION
damage to the product or other equipment unless the described instruction is abided by.
The instrument and this manual also use the following safety symbols:
Caution
This symbol indicates that the operator must refer to an explanation in the
instruction manual in order to avoid the risk of injury or death of personnel and/or
damage to the instrument.
Double Insulation
This symbol indicates double insulation.
AC Voltage/Current
This symbol indicates AC voltage/current.
DC V oltage/Current
This symbol indicates DC voltage/current.
Fuse
This symbol indicates a fuse.
Ground
This symbol indicates ground (earth).
WARNING
■ To avoid electric shock
•Do not use deteriorated or damaged testing leads. Check testing leads before use.
•Do not use the instrument if there is any damage to the casing or when the casing is
removed.
•Disconnect testing leads from the circuit under test before opening the casing to replace the batteries or for any other reason.
•
Avoid using the instrument if it has been exposed to rain or moisture or if your hands are wet.
■ To avoid electric shock or fire
Do not use the instrument in an atmosphere containing any flammable or explosive gases.
WARNING
■ Measurement Category (CAT.)
The restrictions on the maximum voltage level for which the 73301, 73302 and 73303
multimeters can be used, depend on the Measurement categories specified by the safety
standards.
Measurement Category (CAT) Maximum Input Voltage
III 600 V AC/DC
II 1000 V A C/DC
CAT.I For measurements performed on circuits not directly connected to MAINS.
CAT.II For measurements performed on circuits directly connected to the low
voltage installation.
CAT.III For measurements performed in the building installation.
CAUTION
•Do not use the multimeter near noise-emitting equipment or where there may be a
sudden change of temperature. Otherwise, the instrument may give an unstable reading or errors.
•Do not wipe the instrument using any organic solvent such as benzine or paint thinner,
as this may damage or discolor the front panel. Use a dry cloth to clean the instrument.
•Do not leave the multimeter exposed to direct sunlight or in a hot and humid location
such as the inside of a car, for any prolonged length of time.
NOTE
•Radiation immunity affects the accuracy of 733 Series digital multimeter under the
conditions specified in EN 61326-1.
•
If equipment generating strong electromagnetic interference is located nearly , the tester s
may malfunction.
Components
1) Function Switch
Turns off the power or selects the measurement mode.
OFF: Turns off the power.
V: AC voltage measurement
V: DC voltage measurement
mV: DC voltage measurement in milli-volts
Ω : Resistance measurement
: Capacitor check (73302 & 73303)
: Diode test (73301)
µA/mA/A: DC/AC current measurement
2)SELECT key
This button is enabled only if the multimeter is in one of the following measurement modes.
•
V:
In this mode, the key selects the frequency measurement in hertz (73302 & 73303).
In this mode, the key selects the AC voltage measurement in an average value.
(73303)
• mV: In this mode, the key selects AC voltage measurement in milli-volts.
• Ω: In this mode, the key selects among the continuity check, diode test, and tempera-
ture measurement.
•
: In this mode, the button adjusts the stray capacitance of the testing leads and the
multimeter itself, to zero (73302 & 73303).
• µA/mA/A: In this mode, the button selects AC current measurement.
3) RANGE key
Allows the operator to select the measuring range manually (the display shows the
R • H
symbol). The range increases as the button is pressed.
To return to the normal auto-ranging mode, hold down this button for at least one second until
the display shows "
4) D-H/A-H key
Selects between the DATA HOLD and AUTO HOLD functions (the display shows the
symbol when in the DATA HOLD mode, and the
AUTO
."
A • H
symbol when in the A UT O HOLD mode).
D • H
5) REL/% key
REL
Selects between REL and % calculations (the display shows the
REL
mode, and the REL and % symbols when in the % mode).
symbol when in the
<6> Display
<2> SELECT key
<3> RANGE key
<5> REL/% key
<4> D-H/A-H key
<1> Function switch
Input terminal
6)Display Description
Symbol and Unit Description
REL
D • H
A • H
R • H
AUTO
RMS
AVG
AUTO POWER OFF AUTO POWER OFF indicator
nF, µF Unit for capacitance measurement
mV, V Unit for voltage measurement
µA, mA, A Unit for current measurement
Ω, kΩ, MΩ Unit for resistance measurement
°C Unit for temperature measurement
Hz Unit for frequency measurement
% Unit for percentage calculation
+ –
Lit when in DC-mode measurement
Lit when in AC-mode measurement
Polarity indicator-lit when the polarity is negative
Lit when in diode test
Lit when in continuity check
REL calculation indicator
DATA HOLD indicator
AUTO HOLD indicator
Manual range indicator
AUTO RANGE indicator
AC root-mean-square voltage measurement indicator
AC average-voltage measurement indicator
Lit when the batteries are low
Bar graph indicator
Measuring Instructions
To aboid damage to Instrument or equipment
•Before starting measurement, make sure that the function switch mode is set and the
testing leads are plugged into the terminals required for the desired mode of measurement.
•Temporarily remove the testing leads from the device under test before operating the
function
switch
.
•AC Voltage Measurement (
a) Turn the function
switch
b) Press the SELECT key when the mV mode is selected (the display shows the ~ symbol).
c) Plug the black testing lead into the COM input terminal and the red testing lead into the
V • Ω •
input terminal.
d) Connect the testing leads to the circuit under test and then read the meter when it stabilizes.
Note: When the ~V mode is selected, the AC voltage can be displayed as an average or effec-
tive value. Press the SELECT key to display the AVG or RMS symbol (73303).
• DC Voltage Measurement (
a) Turn the function
switch
b) Plug the black testing lead into the COM input terminal and the red testing lead into the
V • Ω •
input terminal.
V)
from the OFF position to the V or mV position.
V)
from the OFF position to the V position.
c) Connect the testing leads to the circuit under test and then read the meter when it stabilizes.
NOTE
Do not mistake the following for a malfunction!
If the 400 mV range is selected and the testing leads are left open-circuited, the multimeter may give a certain reading. This does not affect your measurement.
•Resistance Measurement (Ω)
CAUTION
To avoid damage to instrument
Turn off the power to the circuit under test before starting measurement in order to prevent any excessive voltage from being applied to the multimeter.
a) Turn the function switch from the OFF position to the Ω position.
b) Plug the black testing lead into the COM input terminal and the red testing lead into
the
• V • Ω • input terminal.
c) Connect the testing leads to the circuit under test and then read the meter when it stabilizes.
•Continuity Check (
)
CAUTION
To avoid damage to instrument
Turn off the power to the circuit under test before starting measurement in order to prevent any excessive voltage from being applied to the multimeter.
a) Turn the function switch from the OFF position to the Ω position.
b) Press the SELECT key to display the
symbol.
c) Plug the black testing lead into the COM input terminal and the red testing lead into the •
V • Ω •
input terminal.
d) Connect the testing leads to the circuit under test. If the circuit is continuous (no more than
approximately 20 Ω, the buzzer sounds.
•Diode Test (
)
CAUTION
To avoid damage to instrument
Turn off the power to the circuit under test before starting measurement in order to prevent any excess voltage from being applied to the multimeter.
a) Turn the function switch from the OFF position to the Ω position. (For 73301 turn to the
position.)
b) Press the SELECT key to display the
c) Plug the black testing lead into the COM input terminal and the red testing lead into the
V • Ω •
input terminal.
symbol.
•
d) Connect the testing leads to the diode under test and then read the meter when it stabilizes.
(1) Forward-bias Diode Test
Connect the black testing lead to the cathode and the red testing lead to the anode.
(2) Reverse-bias Diode Test
Connect the black testing lead to the anode and the red testing lead to the cathode.
•Temperature Measurement (TEMP)
CAUTION
To avoid damage to instrument
Turn off the power to the circuit under test before starting measurement in order to pre-
vent any excessive voltage from being applied to the multimeter.
a) Turn the function switch from the OFF position to the Ω position.
b) Press the SELECT key three times to select the TEMP mode (the display shows the °C
symbol).
c) Plug the black lead of the optional 234901 thermistor measuring probe into the COM input
terminal and the red lead into the
• V • Ω • input terminal.
d) Connect the testing leads to the circuit under test and then read the meter when it stabilizes.
•Current Measurement (µA/mA/A)
CAUTION
To avoid damage to instrument
Check which mode the function switch is set to before starting measurement.
a) Turn the function switch from the OFF position to either the µA, mA or A position. (If the
magnitude of the current being measured is not known, select the A position. Make sure the
current being measured is no more than 0.4 A before the µA or mA position is selected.)
b) Press the SELECT key to select DC or AC measurement.
c) Plug the black testing lead into the COM input terminal and the red testing lead into the A
input terminal. If the current is in the order of milli-amperes or less, plug the red testing lead
•
into the µA • mA input terminal.
d) Connect the testing leads to the circuit under test and then read the meter when it stabilizes.
•
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