User’s
Manual
Model 733 01/ 02/ 03
Digital Multimeters
IM 73301E
1st Edition:Jul. 1999
4th Edition:Mar.2001
Store this manual in a safe place for
future reference.
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 (733 02 & 733 03).
In this mode, the key selects the AC voltage measurement in an average value.
(733 03)
• 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 (733 02 & 733 03).
•
µ
A/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
sym-
bol). 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 "
AUTO
."
4) D-H/A-H key
Selects between the DATA HOLD and AUTO HOLD functions (the display shows the
D • H
symbol when in the DATA HOLD mode, and the
A • H
symbol when in the AUTO HOLD mode).
5) REL/% key
Selects between REL and % calculations (the display shows the
REL
symbol when in the
REL
mode, and the REL and % symbols when in the % mode).
<6> Display
<1> Function switch
Input terminal
<5> REL/% key
<4> D-H/A-H key
<3> RANGE key
<2> SELECT key
6) Display Description
Symbol and Unit
Description
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
AUTO POWER OFF
AUTO POWER OFF indicator
nF,
µ
F
Unit for capacitance measurement
mV, V
Unit for voltage measurement
µ
A, mA, A
Unit for current measurement
Ω
, k
Ω
, M
Ω
Unit for resistance measurement
°
C
Unit for temperature measurement
Hz
Unit for frequency measurement
%
Unit for percentage calculation
Lit when the batteries are low
Bar graph indicator
A • H
D • H
REL
R • H
AUTO
RMS
AVG
+ –
Measuring Instructions
CAUTION
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 measure-
ment.
• Temporarily remove the testing leads from the device under test before operating the
function switch.
• AC Voltage Measurement ( V)
a) Turn the function switch from the OFF position to the V or mV position.
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 (733 03).
• DC Voltage Measurement ( V)
a) Turn the function switch from the OFF position to the V 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.
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 multim-
eter 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 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) 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 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 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 pre-
vent any excess voltage from being applied to the multimeter.
a) Turn the function switch from the OFF position to the
Ω
position. (For 733 01 turn to the
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 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 to select the TEMP mode (the display shows the
°
C symbol).
(Press the SELECT key to change the temp. unit from the
°
C to the
°
F.)
c) Plug the black lead of the optional 2349-01 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 (
µ
A/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
µ
A, 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
µ
A 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
µ
A • mA input terminal.
d) Connect the testing leads to the circuit under test and then read the meter when it stabilizes.
User Calibration Function (Not supported on the 733 01)
It is recommended that the instrument be calibrated periodically.
Use the keys on the faceplate of 733 series of multimeters to carry out calibration.
Recommended calibrator: The 9100 universal calibrator (Yokogawa), its equivalent or above.
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
µ
ADC
380
µ
A
10 nF
9 nF
4 VDC
3.8 V
4000
µ
ADC
3800
µ
A
100 nF
90 nF
40 VDC
38 V
40 mADC
38 mA
1
µ
F
0.9
µ
F
400 VDC
380 V
400 mADC
380 mA
10
µ
F
9
µ
F
1000 VDC
1000 V
4 ADC
3.8 A
100
µ
F
90
µ
F
10 ADC
10 A
1000
µ
F
1000
µ
F
VAC (RMS)
3.8 V at 60 Hz
VAC (AVG)
3.8 V at 60 Hz
AAC
38 mA at 60 Hz
Safety Precautions
To ensure safe use of the product, strictly adhere to the precautions indicated by the following
symbols throughout this manual.
WARNING
This symbol indicates that misuse of the instrument could result in in-
jury or death of personnel.
CAUTION
This symbol indicates that misuse of the instrument could result in in-
jury to personnel or damage to property.
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 Voltage/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 re-
place 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
■
To avoid damage to instrument and/or electric shock
The restrictions on the maximum voltage level for which the 733 01, 733 02 and 733 03
multimeters can be used, depend on the over-voltage categories specified by the safety
standards. These category specifications are set to protect operators against transient
impulse voltages in power lines.
Over-voltage Category (CAT)
Maximum Input Voltage
III
600 V AC/DC
II
1000 V AC/DC
Over-voltage category I (CAT I):
Covers the path from a mains outlet, through a power transformer, to a circuit in the
transformer's secondary stage.
Over-voltage category II (CAT II):
Covers a primary-stage circuit of equipment connected to a mains outlet.
Over-voltage category III (CAT III):
Covers the path from an indoor distribution switchboard to a mains outlet.
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 read-
ing 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 testers
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 (733 02 & 733 03)
:
Diode test (733 01)
µ
A/mA/A:
DC/AC current measurement
