Warning
To avoid electric shock or personal injury, read
"Safety Information" and is Warning and
Precautions" before using the Meter
Safety information
This series meter Comply with IEC 1010-1 CAT I
600V / CAT II 300V overvoltage standards. See
specifications
Use the Meter only as specified in this manual,
otherwise the protection provided by the Meter
may be impaired.
In this manual a Warming identifies conditions
and actions that pose hazards to the user.
A caution identifies conditions and actions that
may damage the meter ort he equipment under
test
International symbols used on the Meter and in
this manual are explained Table
2
Table 1. International Electrical Symbols
AC (Alternating Current)
DC (Direct Current)
AC or DC
Battery
Safety information* Refer to the manual
Earth ground
Fuse
Conforms to European Union directive
Double insulated
WARNING AND PRECAUTIONS
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:
Do not use the meter if it is damaged. Before you
use the meter, inspect the case. Pay particular
attention to the insulation surrounding the
connectors.
Inspect the test leads for damaged insulation or
3
Do not use the meter if it operates abnormally.
Protection may be impaired. When in doubt, have
the meter serviced.
Do not operate the meter around explosive gas,
vapor, or dust.
Do not apply more than the rated voltage, as
marked on the meter between terminals or
between any terminal and earth ground.
Before use, verify the meter's operation by
measuring a known voltage.
When measuring current, turn off circuit power
before connecting the meter in the circuit.
When servicing the meter, use only specified
replacement parts. Do not use the Meter in a
manner not specified by this manual or the safety
features of the meter may be impaired.
Use with caution when working above 30V ac rms,
42V ac peak, or 60V dc. Such voltages pose a
shock hazard.
When using the probes, keep your fingers behind
the finger guards on the probes.
Connect the common test lead before you
connect the live test lead. When you disconnect
test leads, disconnect the live test lead first.
Remove the test leads from the meter before you
open the battery door. Do not operate the meter
4
with the battery door or portions of the cover
removed or loosened.
To avoid false readings, which could lead to
possible
Safety Compliance: IEC 61010-1, 2000 CAT I
600V overvoltage standards Do not measure
voltages above 500V in Category installations
Overvoltage installations categories per IEC
61010-1, 2000: The meter is designed to protect
against transients in these categories:
CAT I From high-voltage low-energy sources,
CAT II From equipment supplied from the fixed
CAT III From equipment in fixed equipment
General specifications
Maximum Voltage between any Terminal and
Measurement rata: updates 2-3/sec.
Over range indication: "1' figure only in the display
Automatic negative polarity indication.
The
operating temperature: 0℃~40℃, 0-75% RH.
e.g., electric circuits or a copy machine
installation, e.g., TVs, PCs, portable tools
and household appliances
installations, e.g. installation panels,
feeders and short branch circuits, and
lighting systems in large buildings.
Earth Ground: 1000V
is displayed when the battery voltage
drops below the operating voltage
5
Storage temperature: -10℃~50℃, 0-75% RH.
Power: Single standard 1.5V battery AAAx2
Dimensions: 130L*72W*28H mm
Weight approx: 130g (not including battery)
FRONT PANEL DESCRIPTION
1. LCD Display
2. DATA HOLD button
3. BACK LIGHT button
4. FUNCTION AND RANGE SWITCH
This switch is used to select the function and
desired range as well as to turn on the instrument.
To extend the life of this battery, the switch should
be in the "OFF" position when the instrument is
not in use.
5. “VΩmA" JACK
6. "10A" JACK
7. "COM" JACK
SPECIFICATIONS
Accuracies are guaranteed
less than 80%RH
for 1 year, 23℃±5 ℃,
6
DC VOLTAGE
Range Resolution Accuracy
200mV 100uV
2000mV 1mV
20V 10mV
200V 100mV
500V 1V ±(1.0%+3d)
OVERLOAD PROTECTION: 220V rms AC for
200mV range and 500V DC or 500V rms for all
ranges.
AC VOLTAGE
Range Resolution Accuracy
200V 100mV
500V 1V
RESPONSE: Average responding, calibrated in rms
of a sine wave.
FREQUENCY RANGE: 40Hz ~400Hz
OVERLOAD PROTECTION: 500V DC or 500V rms
for all ranges.
±0.8%+3d
±1.2%+5d
7
DC CURRENT
Range ResolutionAccuracy
2000uA 1 uA
20mA 10 uA
200mA 100 uA
10A 10mA ±(2.5%+5d)
OVERLOAD PROTECTION: 200mA 250V fuse (10A
range unused).
MEASURING VOLTAGE DROP: 200mV
AUDIBLE CONTINUITY
RANGE DESCRIPTION
OVERLOAD PROTECTION: 5 second maximum
220V rms.
WARNING: DO NOT input any voltage at this
range for safety!
SQUARE-WAVE OUTPUT (MT-1233D Only)
RANGE DESCRIPTION
WARNING: DO NOT input any voltage at this
range for safety!
Built-in buzzer sounds if resistance
is less then 30±20Ω
The output of about 50Hz square
wave test signal
±(1.2%+5d)
8
RESISTANCE
Range
200Ω 0.1Ω ±(1.5%+5d)
2000Ω 1Ω
20kΩ 10Ω
200kΩ 100Ω
20MΩ 10KΩ ±(1.0%+5d)
200MΩ 100KΩ - ±[1.0%(rdg
MAXIMUM OPEN CIRCUIT VOLTAGE: 2.3V.
OVERLOAD PROTECTION: 5 seconds maximum
220Vrms.
WARNING: DO NOT input any voltage at
resistance range for safety!
TEMPERATURE (MT-1233C only)
RANGE RESOLUTIONACCURACY
-40℃~150℃±(1.0%+3d)
150℃~1000℃
-40℉~302℉±(1.0%+4d)
302℉~1832℉
WARNING: DO NOT input any voltage at this
range for safety!
ResolutionMT-1233CMT-1233D
±(1.0%+3d)
-l0)+10d]
1℃
1℉
±(1.5%+15d)
±(1.5%+15d)
9
OPERATING INSTRUCTIONS
WARNING
To avoid electrical shock hazard and/or dam
of the Instrument
might exceed 60
Before the use of instrument, inspect test leads,
connectors and probes for cracks, breaks, cracks
in the insulation.
Dangerous voltages may be pres
terminals and ma
To avoid electrical shock or damage to the meter
w
hen measuring resistance or continuity
circuit, make sure the po
turned of
, do not measure volt
0V above earth gr
y not be displaye
f and all capa
ound.
ent at the input
d.
wer to th
citors are discharged.
e circuit is
age
ages that
in a
DC & AC VOLTAGE MEASUREMENT
1. Connect red test lead to "VΩmA" jack, Black
OM" jack.
to "C
2. Set RANGE switch to desired VOLTAGE
if the volt
hand, set switch to the highest range and reduce
it until satisfactory rea
Connect test lead
3.
measured.
Turn on power of
4.
measured voltage value will appear on Digital
Display
age to be measured is not known befor
ding is obt
s to device or circuit being
the device or circuit being
along with the voltage polarity.
ained.
position,
10
lead
e
DC CURRENT MEASUREMENT
1. Red lead lo "VΩmA". Black lead to "COM”(for
measurements between 200mA and 10A connect
red lead to "10A” jack with fully depressed.)
2. RANGE switch to desired DCA position.
3. Open the circuit to be measured and connected
test leads INSERIES with the load in with current
is to measure.
4. Read current value on Digital Display.
5. Additionally,"10A"function is designed for
intermittent use only. Maximum contact time of
the test leads with the circuit is 15 seconds with a
minimum intermission time of seconds between
tests.
RESISTANCE MEASUREMENT
1. Red lead to "VΩmA". Black lead to "COM".
2. RANGE switch to desired OHM position.
3. If the resistance being measured is connected to
a circuit, turn off power and discharge all
capacitors before measurement.
4. Connect test leads LO circuit being measured.
5. Read resistance value on Digital Display.
DIODE MEASUREMENT
1. Red lead to "VΩmA", Black lead to "COM".
2. RANGE switch to "
' position.
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3. Connect the red test lead to the anode! of the
diode to be measured and black test lead to
cathode.
4. The forward voltage drop in mV will be displayed.
If the diode is reversed, figure "1" will be shown.
TEMPERATURE MEASUREMENT
(MT-1233C only)
1. Connect the K type thermoelectric couple to
"VΩmA" and "COM" jacks.
2. RANGE switch to TEMP position.
3. The display will read Temperature value ℃
AUDIBLE CONTINUITY TEST
1. Red lead to "VΩmA", Black lead to "COM".
2. RANGE switch to “
3. Connect test leads to two points of circuit to be
tested. If the resistance is lower than 30Ω±20Ω,
the buzzer will sound.
TEST SIGNAL USE (MT-1233D only)
1. RANGE switch to "
2. A test signal (50Hz) appears between "VΩmA"
and "COM” jack, the output voltage is approx 3V
p-p with about 50KΩ impedance.
”position.
”position.
12
MAINTENANCE
Beyond replacing batteries and fuses, do not
attempt to repair or service your Meter unless you
are qualified to do so and have the relevant
calibration, performance test and service
instruments. The recommended calibration cycle is
12 months.
To clean the terminals
a) Push the Meter OFF and remove test leads.
b) Shake out any dirt that may be in the terminals.
c) Soak a new swab with isopropyl and work around
the inside of each input terminal
d) Use a new swab to apply a light coat of fine
machine oil to the inside of each terminal.
FUSES TEST
Warning
To avoid electric shock or injury, remove the test
leads and any input signals before replacing the
fuses
1. Turn the rotary switch to 200mA position.
2. Use a multimeter to measure resistance of
"VΩmA" terminal or 10A terminal to COM
terminal.
A good mA terminal or 10A terminal fuse is
indicated by a reading between 0Ω and 10Ω.
If the display is overloaded, replace the fuse and
test again.
If the display shows any other value, have the meter
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serviced. See "Service and Parts" later in this
manual.
BATTERY AND FUSE REPLACEMENT
1) Battery and fuse replacement should only be
done after the test leads have been disconnected
and power is off.
2) Loosen screws with suitable screwdriver and
remove case bottom.
3) The meter is powered by 1.5V battery (AAAx2).
Snap the battery connector leads to the terminals
of a new battery and reinsert the battery into the
case top. Dress the battery leads so that they will
not be pinched between the case bottom and
case top.
4) The meter is protected by fast action fuse
0.2mA/250V, dimensions is ¢5*20mm.
5) Replace the case bottom and reinstall the three
screws, never operate the meter unless the case
bottom is fully dosed.
ACCESSORIES
User’s manual
Set of test leads(CAT I 600V
K type thermoelectric couple (MT-1233C only)
SERVICE AND PARTS
If the Meter fails, check the batteries and fuses first,
and then review this manual to make sure that you
are operating the Meter correctly