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Operating Instruction; General Characteristics; Replacing Test Leads - Mastech M320C Operator's Instruction Manual

Auto ranging pocket-sized digital multimeter

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Resistance
Diode test
Range
Resolution
Accuracy
Range
Description
400Ω
0.1Ω
±1.0% of rdg ±3dgts
Show the approx.
4kΩ
±1.0% of rdg ±3dgts
forward voltage drop of the diode.
40kΩ
±1.0% of rdg ±3dgts
10Ω
Overload Protection: 250V rms ac
±1.0% of rdg ±3dgts
400kΩ
0.1kΩ
±1.0% of rdg ±3dgts
4MΩ
1kΩ

General Characteristics

40MΩ
10kΩ
±2.0% of rdg ±4dgts
Environment conditions:
Maximum Open Circuit Voltage:0.65V
Pollution degree: 2.
Overload Protection: 250V rms ac for all ranges
Altitude < 2000 m.
Operating temperature:
Frequency
0~40°C (32
Range
Resolution
Accuracy
Storage temperature:
10Hz
0.001Hz
±0.5% of rdg ±3dgts
-10~50°C(14
0.01Hz
±0.5% of rdg ±3dgts
Maximum voltage between terminals and earth
100Hz
ground:CAT III 300V
1kHz
±0.5% of rdg ±3dgts
0.001kHz
±0.5% of rdg ±3dgts
Fuse Protection
10kHz
0.01kHz
Power supply
±0.5% of rdg ±3dgts
100kHz
0.1kHz
Display
Overload Protection: 300V DC or rms AC for all ranges
Measuring method
Sensitive: 500mV RMS
Over range indication
Capacitance
Polarity indication
Operating temperature
Range
Accuracy
Resolution
Storage temperature
4nF
0.001nF
±5% of rdg ±10dgts
Low battery indication
40nF
0.01nF
±4% of rdg ±5dgts
Size
400nF
0.1nF
±3% of rdg ±3dgts
Weight
±3% of rdg ±3dgts
4uF
0.001uF
±3% of rdg ±3dgts
40uF
0.01uF
±3% of rdg ±3dgts
100uF
0.1uF
Overload protection: 250Vp
06

Operating Instruction

DC Voltage Measurement
1. Set the function switch at V position. And push SELECT
button for DC.
2. Connect test leads across the source or load under
measurement. The Polarity of red lead connection will be
indicated at the same
time as the Voltage value.
AC Voltage Measurement
1.
Set the function switch at V position. And push SELECT
button for AC.
2.
Connect test leads across the source or load being measured
and read the voltage value on the LCD display.
°
F to 104
°
F), (<80% RH, non-condensing)
DC Current Measurement
°
°
F to 122
F), (<70% RH, battery removed)
1.
Set the function switch at mA position. And push SELECT
button for DC.
2. Open the circuit in which the current is to be measured, and
F 400mA/300V
connect Test leads in series with the circuit.
3V battery, SR44 or LR44 X 2
3. Read current value on the LCD display along with the polarity
LCD, 3999 counts, updates 2-3/sec.
of red lead connection.
Dual-slope integration A/D converter
AC Current Measurement
Figure"OL" on the display
1. Set the function switch at mA position. And push
"-"displayed for negative polarity
SELECT button for AC.
0
°
Cto 40
°
C (32
°
F to 104
°
F)
2. Open the circuit in which the current is to be measured,
-10
°
C to 50
°
C (10
°
F to 122
°
F)
"
and connect Test leads in series with the circuit and
"
appears on the display
read LCD display.
120X70X18mm
Approx.110g including batteries
07
Resistance Measurement
1. Set the function switch at Ω position.
(Note: The polarity of red lead is positive"+")
2. Connect test leads across the resistor to be measured
and read LCD display.
3. If the resistor being measured is connected to a circuit,
turn off power of the circuit and discharge all capacitors
before applying test leads.
4. When measuring resistance above 1MΩ, the meter will
take a few seconds to get stable reading .It is normal for
high resistance measurement.
Frequency Measurement
1. Set the function switch at Hz position.
2. Connect test leads across the source or load being
measured and read the frequency value on the
LCD display.
Capacitance Measurement
1. Set the function switch at Capacitance position.
2. Connect test leads across the source or load being
measured and read the capacitance value on the
LCD display.
Diode Test
1. Set the function switch at
position.(Note: The
polarity of red lead is Positive"+")
2. Connect the red test lead to the anode of the diode to
be tested and the Black lead to the cathode of the diode.
3. The approx. forward voltage drop of the diode will be
displayed .If the Connection is reversed; only figure
"OL"will appear on the LCD display.
08
09
Audible Continuity test
Warning
1. Set the function switch at
position. And push SELECT
Before attempting to open the case, always be sure that
button for continuity
test leads have been disconnected from measurement
2. Connect test leads to two points of the circuit to
circuit. Close case and tighten Screws completely before
be tested.
using the meter to avoid electrical shock hazard.
If the Resistance is less than 50±20Ω, buzzer will sound.
For protection against fire, replace fuse only with the
Data Hold Application
specified ratings: F 400mA/300V.
HOLD button is used to hold a measuring result. When

Replacing test leads

this button is Pushed, LCD will keep the last reading until
Replace test leads if leads become damaged or worn.
pushing this button again or rotating the function switch.
Battery&Fuse Replacement
If the test leads need to be replaced, you must use a
If the sign
appears on the LCD display, it indicates
new one which should meet EN 61010-031 standard,
that the battery should be replaced. Remove the screw on
the back cover and open the Case. Replace the exhausted
rated CAT III 300V, 0.4A or better.
batteries (SR44 or LR44) with same types.
Fuse rarely need replacement and blow almost always
Accessories
as a result of Operator's error .Open the case and replace
Battery
blown fuse with same ratings(F400mA/300V
)
Carrying Case
WARNING
Operating manual
To avoid electric shock, make sure the probes are
disconnected from the measured circuit before
Caution:
removing the rear cover. Make sure the rear cover is
Using this appliance in an environment with a strong
tightly screwed before using the instrument.
radiated radio-frequency electromagnetic field
(approximately 3V/m), may influence its measuring
accuracy. The measuring result can be strongly
deviating from the actual value.
10
WARNING
4pcs (Sr44 or Lr44)
1pcs
1pcs
R-00-05-1659

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