Mastech MS8040 User Manual
BENCH MODEL MULTIMETER
Contents
Contents......................................................................................................................................................................................... I
Chapter 1..................................................................................................................................................................................... 1
Safety Standards............................................................................................................................................................................. 1
Warning......................................................................................................................................................................................... 1
Warranty......................................................................................................................................................................................... 2
Chapter 2..................................................................................................................................................................................... 3
Introduction and Specifications..................................................................................................................................................... 3
Front Panel..................................................................................................................................................................................... 3
Rear Panel..................................................................................................................................................................................... 7
LCD Display Description............................................................................................................................................................. 9
Function Descriptions..................................................................................................................................................................... 10
Chapter 3 Operation Manual..................................................................................................................................................... 11
Understanding AC Zero Input Behavior of True RMS Meters.................................................................................................... 11
DC/AC(TRMS) Voltage................................................................................................................................................................. 11
DCmV/ACmV............................................................................................................................................................................. 13
Ohm/Continuity/DIODE.................................................................................................................................................................14
Capacitance Measurement............................................................................................................................................................. 15
Logic Frequency/Duty cycle Measurement................................................................................................................................. 16
Clamp Measurement..................................................................................................................................................................... 17
I
Temperature measurement............................................................................................................................................................. 19
DCμA / AcμA measurement......................................................................................................................................................... 20
DC mA / AC mA measurement..................................................................................................................................................... 21
DC A / AC A measurement............................................................................................................................................................. 22
Linear Frequency Measurement..................................................................................................................................................... 23
Relative Measurement................................................................................................................................................................. 24
Max/Min Value............................................................................................................................................................................. 25
Data Hold..................................................................................................................................................................................... 25
Low Passed Filter......................................................................................................................................................................... 25
Peak Value..................................................................................................................................................................................... 26
RS232 Interface............................................................................................................................................................................. 26
Auto Power Off............................................................................................................................................................................. 26
Chapter 4 Specification................................................................................................................................................................. 27
General Specification..................................................................................................................................................................... 27
Range and Accuracy..................................................................................................................................................................... 27
Chapter 5 Maintenance................................................................................................................................................................. 33
Introduction.....................................................................................................................................................................................33
Replacing the Fuse......................................................................................................................................................................... 33
Replacing the Power Fuse............................................................................................................................................................. 34
Replacing the Battery..................................................................................................................................................................... 34
Chapter 6 Accessories................................................................................................................................................................. 35
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BENCH MODEL MULTIMETER
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BENCH MODEL MULTIMETER
Chapter 1
Safety Standards
This style of digital multimeter is designed and manufactured according to the safety requirements set out by the IEC 61010-
1 standards for electronic test instruments . Its design and manufacture is strictly based on the provisions in the 1000V CAT II
of IEC61010-1 and the Stipulation of 2-Pollution Grade.
Warning
To avoid possible electric shock, personal injury, or death, read the following before using the Meter:
Use the Meter only as specified in this manual, or the protection provided by the Meter might be impaired.
Do not use the Meter in wet environments.
Inspect the Meter before using it. Do not use the Meter if it appears damaged.
Inspect the test leads before use. Do not use them if insulation is damaged or metal is exposed. Check the test leads for
continuity. Replace damaged test leads before using the Meter.
Verify the Meter's operation by measuring a known voltage before and after using it. Do not use the Meter if it operates
abnormally. Protection may be impaired. If in doubt, have the Meter serviced.
Whenever it is likely that safety protection has been impaired, make the Meter inoperative and secure it against any
unintended operation.
Have the Meter serviced only by qualified service personnel.
Do not apply more than the rated voltage, as marked on the Meter, between the terminal or between any terminal and
earth ground.
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Replacing the Power Fuse
Always use the power cord and connector appropriate for the voltage and outlet of the country or location in which you
are working.
Remove test leads from the Meter before opening the case.
Never remove the cover or open the case of the Meter without first removing it from the main power source.
Never operate the Meter with the cover removed or the case open.
Use only the replacement fuses specified by the manual.
Use the proper terminal, function and range for your measurements.
Do not operate the Meter around explosive gas, vapor or dust.
When using probes, keep your fingers behind the finger guards.
When making electrical connections, connect the common test lead before connecting the live test lead. When
disconnecting, disconnect the live test lead before disconnecting the common test lead.
Disconnect circuit power and discharge all high voltage capacitors before testing resistance, continuity, diodes, or
capacitance.
Before measuring current, check the Meter's fuses and turn OFF power to the circuit before connecting the Meter to the
circuit.
When servicing the Meter, use only specified replacement parts.
Warranty
The meter is warranted to be free from defects in material and workmanship under normal use and service. The warranty
period is one year and begins on the date of shipment. Parts, product repairs, and services are warranted for 18 months except
for misused, altered, neglected, contaminated, or damaged by accident or abnormal conditions of operation or handling.This
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BENCH MODEL MULTIMETER
warranty does not apply to fuses, disposable batteries.
Chapter 2
Introduction and Specifications
22000 Counts
ACV and DCV up to 1000V
10μV Sensitivity for Voltage measurement.
Linear Frequency 、Logic Frequency and Duty Measurement
Capacity Range from 0.01nF to 220mF
AC TRMS.
Peak Max/Min value Measurement Function
Max/Min，Relative Measurement Function
Low Passed Filter Function
RS-232 Optical Isolation Interface
PC Software for Display Data Record and Data Analysis
Power Supply Methods: 220V/110V AC(50~60Hz)、9V 6F22 Battery、1.5×6 AA Battery
Temperature Measurement
Clamp Measurement
Front Panel
Front panel as below:
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Replacing the Power Fuse
Front Panel Features
1. VΩHz Terminal
Input positive terminal for all measurement except current measurement , connected with red test leads.
2. COM Terminal
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BENCH MODEL MULTIMETER
Input common terminal for all measurement , connected with black test leads.
3. μA/mA Terminal
Input positive terminal for current measurement (μA/mA) , connected with red test lead.
4. A Terminal
Input positive terminal for current measurement (A) , connected with red test lead.
5. Rotary Switch
Switching positions correspondingly when changing different input signals.
Note: Switching position before changing signals in case caused damage.
6. Display Screen
7. Button
Button Description
Name Description
FUNC Function toggling
Back Light（Wake up）, press this button can wake the meter in auto power off mode
RANGE Toggle to manual mode in autorange mode , increase range in manual mode；toggle to autorange mode
when pressing longer than 1 S in manual mode.
Hz Under frequency measurement, toggle from frequency to duty.
HOLD Select hold function.，when the measuing value overload ,Display ‘OL’;
PEAK Select peak function: The peak values are stored in external Capacitors.
MAX/MIN Select max/min function: The meter displays the maximum or minimum value.
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Replacing the Power Fuse
Name Description
LPF To activate the low passed filter function, most of noise above 1KHz will decay greatly.
RELΔ LCD panel displays relative value.
PC-LINK LCD panel displays ‘RS232’ , the meter communicates with PC software.
FUNC button description
Rotary Position Input Signal
DCV
ACV
DCmV ACmV
DCA ACA
TEMP
DCμA ACμA
DCmA ACmA
DCA ACA
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BENCH MODEL MULTIMETER
Button description
RANGE HOLD MAX/MI
N
REL Hz PEAK
（
Note
2
）
LPF PCLINK（N
ote 1)
Voltage ○ ○ ○ ○ ○ ○ ○ ○ ○
Current ○ ○ ○ ○ ○ ○ ○ ○
Clamp ○ ○ ○ ○（A
C
）
○ ○ ○ ○
Resistance ○ ○ ○ ○ ○ X ○
Capacitance ○ ○ ○ ○ ○ X ○
Frequency X ○ X X ○ ○ ○
Duty X ○ X X ○ X ○
Temperature X ○ ○ ○ ○ X ○
Note 1: In Capacitance Measureing mode ,when MAX/MIN or REL function is activated,the data sent to PC software is the
actual value.
Note 2: When PEAK function is activated, the data sent to PC software is invalid
Note 3: ○ meaning the function can be selected, X menaing the function is invalid
Rear Panel
Rear panel as blow
：
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Replacing the Power Fuse
(1) Battery Cover
Replace 9V 6F22 or 1.5×6 AA battery.
(2) Supply Power Inlet with Fuse, Houses Fuse 0.1A/250V.
(3) Power Switch
(4) RS232 Socket
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LCD Display Description
（1）
Bargraph Display Zone
（2）
Digital Display Zone
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