Mastech MS8239T User Manual

MS8239T/MS8239D+
Digital Multimeter User
Manual
Overview of Product Functions
Model
+
MS8239D
Features
Maximum
4000
Display
DC Voltage 0.01mV–600V 0.01mV–600V
AC Voltage 0.01mV–600V 0.01mV–600V
DC Current 0.1uA–10A
AC Current 0.1uA–10A
0.1Ω–40MΩ
Resistance
Capacitance 10pF–40mF
Frequency 1Hz–10MHz
℃
━
℉
━
✓
✓
✓
True RMS
✓
Backlight
✓
NCV
Live Wire
✓
Identification
✓
Data Hold
✓
MIN/MAX
Relative
Value
✓
Measuremen
t
✓
Unit Display
Auto Power
✓
Off
Automatic
Range Mode
Range
Power
1.5V×2
Supply
Introduction
This product is a small handheld digital
multimeter offering stable performance, high
reliability, and anti-drop capabilities. The circuit
design centers around a large-scale dual-slope
integrating A/D converter
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 live wire
detector, non-contact voltage (NCV) tester, and
unit symbol display.
The device is equipped with a backlight
for reading measurements in dark environments.
Panel Diagram
1. Display: LCD screen with 20 mm
character height
2. SEL Button: This button
is used to switch between
two or more functions
within the same range,
such as AC/DC voltage,
AC/DC current, diode,
continuity, and resistance;
℉ and ℃; NCV and live
wire identification.
3．MAX/MIN Button
4. Function Selector Dial
5.10A Jack
6.NCV Indicator Light
7.H Button (Data Hold)
(Backlight Button): Hold down the button
to turn on the backlight, down the button
MS8239T
again to turn off the backlight.
8.REL Button (Relative Value Measurement)
4000
9.COM Jack
10. VΩmA Jack
Safety Information
0.1uA–10A
This series of digital multimeters has been
0.1uA–10A
designed in accordance with IEC1010 600V
0.1Ω–40MΩ
(CAT III) and Pollution Degree 2 standards.
10pF–40mF
Please read this user manual thoroughly to
1Hz–10MHz
ensure safe instrument use and measurement
-20℃ to 750℃
accuracy.
-4℉ to 1382℉
✓
Safety Symbols
✓
Important safety symbol; refer to the
✓
manual
✓
Grounding symbol
✓
High voltage symbol
✓
Double insulation symbol (Class II safety
✓
equipment)
✓
Operation 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.
Automatic
⚫
Do not exceed the input limit specified for
Range
each range.
⚫
1.5V×2
Avoid touching unused input terminals
during measurement.
⚫
When the range of the value to be
measured
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.
with overload
⚫
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
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,
components are connected to the transistor
test socket.
Maintenance
⚫
Disconnect the test leads from the circuit
before opening the back cover.
is unknown, set the
measuring televisions or
ensure that no electronic
1
⚫ 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
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;
Environment Humidity: ≤80%
General Specifications:
● Maximum Voltage between Input and Ground:
CAT III 600V
● Fuse: F500mA/500V, F10A/500V
● Power Supply: 1.5V AAA
2
×
● Maximum Display Value: 4000
● Overload Indicator: "1" or "OL"
● Polarity Display: Negative polarity is
displayed as "-"
● Working Temperature: 0°C to 40°C
● Storage Temperature: -10°C to 50°C
● Low Voltage Indicator: The display shows
● Dimensions: 147 mm × 74 mm × 46 mm
● Weight: Approximately 229 g (including
batteries)
DC Voltage
Range Resolut
ion
40.00mV 0.01m
V
400.0mV 0.1mV
4.000V 0.001V
40.00V 0.01V
400.0V 0.1V
600V 1V
Overload protection: mV range: 250V DC or
AC RMS; all other ranges: 600V DC or AC
RMS
DC Current
Range Resolut
ion
400.0A 0.1A
4000A 1A
40.00mA 0.01mA
400.0mA 0.1mA
4.000A 0.001A
10.00A 0.01A
Overload protection:
F10A/500V fuse
AC Voltage
Range Resolut
ion
40.00mV 0.01m
V
400.0mV 0.1mV
4.000V 0.001V
40.00V 0.01V
400.0V 0.1V
are observed,
Accuracy
±(0.5%+5)
±(0.5%+3)
±(0.8%+3)
±(0.8%+3)
±(0.8%+3)
±(1.0%+5)
Accuracy
±(1.0%+5)
±(1.0%+5)
±(1.0%+5)
±(2.0%+5)
±(2.5%+5)
±(2.5%+5)
F500mA/500V,
Accuracy
±(1.0%+20)
±(1.0%+10)
±(0.8%+3)
±(0.8%+3)
±(0.8%+3)