Mastech MS830T User Manual

Digital Multimeter User Manual
This product is a small handheld 3½-digit digital multimeter offering stable
performance, high reliability, and anti-drop capabilities. The instrument features an
LCD screen with 20 mm character height for clear readings. The circuit design
centers around a large-scale dual-slope integrating A/D converter with overload
protection, making this a superior and compact measurement tool.
The instrument can measure AC/DC voltage, AC/DC current, resistance,
diodes, circuit continuity, temperature, frequency, and capacitance. It also
functions as a battery tester, live wire detector, and non-contact voltage (NCV)
tester. The device is equipped with a backlight for reading measurements in dark
environments.
Panel Diagram
Safety Information
This series of digital multimeters has been designed in accordance with
IEC1010 600V (CAT III) and Pollution Degree 2 standards. Please read this user
manual thoroughly to ensure safe instrument use and measurement accuracy.
Safety Symbols
Important safety symbol; refer to the manual
High voltage symbol
safety equipment)
Operating Precautions
⚫ To comply with safety standards, the instrument must be used with the provided
test leads only. If the test leads are damaged, they must be replaced with the
same model or with leads that have the same electrical specifications.
⚫ Do not exceed the input limit specified for each range.
⚫ Avoid touching unused input terminals during measurement.
⚫ When the range of the value to be measured is unknown, set the function/range
dial to the highest range.
⚫ Before adjusting the function/range dial, ensure that the test leads are
disconnected from the circuit being tested.
⚫ Before measuring resistance in a live circuit, ensure that all power sources are
turned off and all capacitors are fully discharged.
⚫ Be cautious when measuring voltages above 60V DC or 30V AC. Do not touch
the parts of the test leads beyond the finger guards.
⚫ When measuring televisions or switch-mode power supplies, be aware that
pulses in the circuit may damage the instrument.
⚫ Before testing transistors, ensure that the test leads are not connected to any
circuit.
⚫ Before using the test leads to measure voltage, ensure that no electronic
components are connected to the transistor test socket.
Maintenance
⚫ Disconnect the test leads from the circuit before opening the back cover.
⚫ To protect the instrument's internal circuitry, always replace the fuse with one of
the same specifications.
⚫ Do not use the instrument if the back cover is not securely closed or if the
screws are not tightened.
⚫ Clean the instrument with a damp cloth and a small amount of detergent only.
Do not use chemical solvents on the casing.
⚫ If any abnormalities are observed, immediately discontinue use and send the
instrument for repairs.
Technical Specifications
Accuracy: ±(percent of reading + number of counts), valid for 1 year
Environmental temperature: 18°C to 28°C. Environmental humidity: ≤80%
1. Display: LCD screen with 20 mm
character height
2. /H Button: Press to freeze the
displayed value; press again to unfreeze.
Hold down the button to turn on the
backlight; hold down the button again to turn
off the backlight. (Note: Backlight brightness
may decrease when the battery is low.)
3. SEL Button: Press this button to switch
between DCV/ACV, DCA/ACA, °C/℉,
/ , and NCV/Live modes (MS830T
model only).
4. Function/Range Selector Dial
5. Input Jacks
Grounding symbol
Double insulation symbol (Class II
General Specifications:
 Maximum Voltage between Input and Ground: CAT III 600V
 Fuse: F200mA/250V, F10A/250V
 Power Supply: 1.5V AAA ×2
Auto Power Off: The instrument will automatically power off after
approximately 15 minutes.
 Maximum Display Value: 1999
 Overload Indicator: "OL"
 Polarity Display: Negative polarity is displayed as "-"
 Working Temperature: 0°C to 40°C
 Storage Temperature: -10°C to 50°C
 Low Battery Indicator: The display shows
 Dimensions: 133 mm × 71 mm × 47 mm
 Weight: Approximately 190 g (including batteries)
DC Voltage
Range Resolution
200mV 100uV
2V 1mV
20V 10mV
200V 100mV
600V 1V
Input impedance: 10MΩ
Overload protection: 200mV range: 250V DC or AC RMS; all other ranges:
600V DC or AC RMS
DC Current
Range Resolution
200uA 0.1uA
2mA 1uA
20mA 10uA
200mA 100uA
10A 10mA
Overload protection: F200mA/250V fuse, F10A/250V fuse
AC Voltage
Range Resolution
200mV 100uV
20V 10mV
200V 100mV
600V 1V
Input impedance: 10MΩ
Overload protection: 200mV range: 250V DC or AC RMS; all other ranges:
600V DC or AC RMS
Frequency range: 40Hz to 400Hz (MS830M); 40Hz to 1000Hz (MS830T)
Display: MS830M: Average value (Sine Wave RMS); MS830T: True RMS
AC Current (MS830T only)
Range Resolution
200uA 0.1uA
20mA 10uA
200mA 100uA
10A 10mA
Overload protection: F200mA/250V fuse; F10A/250V fuse
Frequency range: 40Hz to 1000Hz
Resistance
Range Resolution
200Ω 0.1Ω
2KΩ 1Ω
20KΩ 10Ω
200KΩ 100Ω
2MΩ 1KΩ
20MΩ 10KΩ
200MΩ 100KΩ
Overload protection: 250V DC or AC RMS
Diode and Continuity Test
Range Description
If resistance is less than 50Ω ± 30Ω, the buzzer will sound.
Buzzer
Diode The approximate forward voltage drop is displayed.
Overload protection: 250V DC or AC RMS
Frequency (MS830T only)
Range Resolution
2kHz 0.001Hz
Overload protection: 250V DC or AC RMS
Capacitance (MS830T only)
20nF 10pF
2uF 1nF
200uF 100nF
Overload protection: 250V DC or AC RMS
Temperature (MS830T only)
Range
Function
-20℃ to 0℃
℃
0℃ to 400℃
Accuracy
±0.5%±3
±0.5%±3
±0.8%±3
±0.8%±3
±0.8%±5
Accuracy
±1.0%±5
±1.0%±5
±1.0%±5
±2.0%±5
±3.0%±5
Accuracy
±1.0%±10
±1.0%±10
±1.0%±10
±1.0%±10
Accuracy
±1.8%±5
±1.8%±5
±2.5%±5
±3.0%±5
Display: True RMS
Accuracy
±1.0%±5
±1.0%±5
±1.0%±5
±1.0%±5
±1.0%±5
±1.2%±8
±5.0%±10
Accuracy
±(1.5%+5d)
±(2.5%+15d)
±(2.5%+15d)
±(3.0%+20d)
Accuracy
Resolution
±4℃
1℃
±(2.0%+3d)