Mastech M320C Operator's Instruction Manual

M320C
Safety information
AUTO RANGING
This meter has been designed according to EN61010-1,
POCKET-SIZED DIGITAL MULTIMETER EN61010-2-030,EN61010-2-033, 300V CAT III and
OPERATOR'S INSTRUCTION MANUAL pollution2.
Follow all safety and operating instructions to ensure the
meter is used safely and is kept in good condition With
proper use and care, your digital multimeter will give you
years of satisfactory service.
During use
• Never exceed the protection limit indicated in the
specifications for each range of measurement.
M320C • Never use the meter to measure voltages that might
AUTO-RANGE
exceed 300V above earth ground in category III
DMM
HOLD SELECT
installations
mA • Always be careful when working with voltages above
60v dc or 30v ac rms. keep fingers behind the probe
barriers while measuring.
• Do not perform resistance measurements on live circuits.
CAT III
Hz
• Inspect test leads and probes for cracks, breaks or
300 V
crazes in the insulation before using the meter
• If the equipment is used in a manner not specified by
OFF manufacturer, the protection provided by equipment may
V
be impaired.
CAT III 300V 300V 400mA MAX
Safety Symbols
Important safety information ,refer to the
instruction manual.
Earth(ground) TERMINAL
Equipment protected throughout by double insulation.
Fuse must be replaced with ratings specified
in the manual.
AC (Alternating Current)
DC (Direct Current)
European union directives
CONFORMS TO UL STD. 61010-1, 61010-2-030,
61010-2-033, 61010-031; CERTIFIED TO CSA STD.
C22.2 No.61010-1,61010-2-030, 61010-2-033, 61010-031.
CAT III: Applicable to test and measuring circuits connected
to the distribution part of the building's low-voltage MAINS
installation.Example:fixed equipment switchboards,circuit
breakers,wiring,including cables,bus bars,junction boxes,
switches,sockets,utput terminals on devices for industrial
use and other equipment.
Maintenance
• Before opening case, always disconnect test beads
from all energized circuits.
• For continuous protection against fire, replace fuse only
with ratings; F 400mA/300V (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 uses only a damp cloth and mild detergent.
01 02
FRONT PANEL
General Description
This compact digital multimeter is designed to measure
AC and DC Voltages, AC and DC current, Resistance,
Diode and to perform audible Continuity checks with
accuracy and ease.
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Small and lightweight, with a carrying case and test leads
wound on its Body, this instrument will provide you years
of satisfactory service.
M320C
1
AUTO-RANGE Auto power-off function extends the battery life. If no
DMM
HOLD SELECT
2 key-inputs happen around 30 minutes, this meter will be
mA turned off automatically.
Specifcation
4
Hz
Accuracy is guaranteed for 1 year,
23°C±5°C,less than 75% RH.
3
V OFF AC Voltage
Range
Resolution
CAT III 300V 300V 400mA MAX
4V 1mV
40V 10mV
300V 1V
1. Select Button 4. Test Leads
Momentary-type push Red test lead for Overload protection: 300V DC or rms AC for all ranges
switch for measuring positive (+) and Input Impedance:10MΩ
functions select .
black test lead for Frequency range: 50Hz to 400Hz, 50 to 60Hz for 300V
2. HOLD Button negative (-) range.
Momentary-type push 5. LCD Display
Response: Average responding, calibrated in rms of
switch for data hold.
3 ¾ digits, 7 segment, a sine wave
3. Function Switch
maximum 3999 counts.
Rotary switch for
selecting functions.
03
DC Voltage
Range Accuracy
Resolution
±0.5% of rdg ±3dgt
400mV 0.1mV
±0.5% of rdg ±3dgt
4V 1mV
40V 10mV ±0.8% of rdg ±3dgt
±0.8% of rdg ±3dgt
300V 1V
Overload protection: 300V DC or rms AC for all ranges
Input Impedance: 10MΩ
AC Current
Range Resolution Accuracy
±3.0% of rdg ± 4dgts
40mA 0.01mA
±3.0% of rdg ± 4dgts
400mA 0.1mA
Overload Protection: F 400mA/300V fuse.
DC Current
Accuracy
Range Resolution Accuracy
±0.8% of rdg ±4 dgts
40mA 0.01mA ±2.0% of rdg ±3dgts
±0.8% of rdg ±4 dgts
±2.0% of rdg ±3dgts
400mA 0.1mA
±0.8% of rdg ±4 dgts
Overload Protection: F 400mA/300V fuse
Audible Continuity Test
Range Description
Built-in buzzer sounds when resistance
is less than 50±20Ω.
Overload Protection:250V rms ac
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