Joy-it JT-DMSO2D72 User manual

JT-DMSO2D72
Portable 3-in-one oscilloscope, signal generator and multimeter
1. GENERAL INFORMATION
Dear customer,
Thank you for choosing our product. Please read the following im-
portant information before putting the device into operation.
This oscilloscope is compact, portable and flexible. It has a TFT-LCD
color display with a resolution of 320 x 240 pixels and adjustable
backlight brightness.
The maximum real time sampling rate can be up to 250 MSa/s. USB
memory devices are also supported, the user can upgrade the firm-
ware via USB, the edge trigger function is automatically detected and
it has a user-defined fast oset calibration with A/D converter that
can sample each channel simultaneously.
3

2. SAFETY INSTRUCTIONS
Safety Terms and Symbols:
following terms may appear on product:
Danger It represents that harms may be caused to you at once if you per-
form the operation.
WarningIt represents that latent harms may be caused to you if you per-
form the operation.
Notice It represents that damage may possibly caused to the product or
other properties if you perform the operation.
Symbols on the product: following symbols may appear on product:
General Safety Summary
Read the following safety precautions to avoid injury and prevent damage
to this product or any products connected to it. To evade potential haz-
ards, use this product only as specified.
Only qualified personnel should perform maintenance.
Use suitable power cord. Use only the power cord specified for this prod-
uct and certified for the country of use.
Connect and disconnect properly. Connect a probe with the oscilloscope
before it is connected to measured circuits; disconnect the probe from the
oscilloscope aer it is disconnected from measured circuits.
Ground the product. This product is grounded through the grounding
conductor of the power cord. To avoid electric shock, the grounding con-
ductor must be connected to earth ground. Before making connections to
the input or output terminals of the product, ensure that the product is
properly grounded.
Notice
Please read
the manual
Protective
ground
terminal
Measuring
ground
terminal
Chassis
ground
terminal

Connect the probe the right way. The probe ground lead is at ground po-
tential. Do not connect the ground lead to an elevated voltage.
Check all terminal ratings. To avoid fire or shock hazard, check all ratings
and markings on the product. Refer to the product manual for detailed in-
formation about ratings before making connections to the product.
Do not operate without covers. Do not operate this product with covers or
panels removed.
Avoid exposed circuitry. Do not touch exposed connections and compo-
nents when power is present.
Do not operate with suspected failures. If you suspect there is damage to
this product, have it inspected by qualified service personnel.
Assure good ventilation.
Do not operate in wet/damp environments.
Do not operate in an explosive atmosphere.
Keep product surfaces clean and dry.
3. TECHNICAL SPECIFICATIONS
Channels 2
Bandwidth 70 MHz
Sampling Rate 250 MSa/s Single channel
125 MSa/s Dual channel
Oscillospe Specifications: -Horizontal
Rising time ≤ 5 ns
Waveform Interpolation (sin x)/x
Record length 6000 samples Single channel
3000 samples Dual channel
SEC/DIV Range of 1, 2, 5 Sequence 5 ns/div - 500s/div
Oscilloscope Specifications: -Vertical
A/D converter 8-bit resolution
VOLTS/DIV range 10mV/div –10V/div at BNC input
Measurement Range ± 5 div
Rising time at BNC input, typical ≤ 5 ns

Selectable analog bandwidth limit,
typical Typical 20 MHz (reduced to 6 MHz when using a 1x probe)
Low frequency response (-3db) ≤ 10 Hz
DC gain accuracy 10V/div - 10mV/div ±3% for normal or
Trigger
Type Edge
Mode Auto, Normal, Single
Level ± 4 divisions from centre of screen
Trigger level accuracy 0,2 div*volts/div within 4 div.
Slope Rising, falling, rising & falling
Source CH1, CH2
Input
Coupling DC, AC or GND
Input impedance (DC coupled) 25pF ±3pF, 1MΩ ±2%
Probe attenuation 1X, 10X
Supported probe attenuation factors 1X, 10X, 100X, 1000X
Input protection voltage 150 VRMS
Measurement
Values between cursors Voltage Dierence: △V
Time Dierence: △T
Automatic measurement Frequency, Amplitude
General specifications
Display type 2.6 inch 64K color TFT-LCD
Display resolution 320 horizontal x 240 vertical pixel
Display contrast Adjustable
Power supply voltage 100-240V AC, 50-60Hz OR 5V DC, 2A
Power consumption < 2.5 W
Fuse T, 3 A
Battery 2 x 2600 mAh
Operating temperature 0– 50°C
Storage temperature -20-60°C

Allowed relative humidity ≤ 40°C: ≤90% RH, 40-50°C: ≤60% RH
Cooling Method Convection
Altitude:
-Operating and Nonoperating 3 000 m (10 000 feet)
-Random vibration 0.31 gRMS from 50 - 500Hz, 10 minutes on each
axis
-Nonoperating 2,46 gRMS from 5 - 500 Hz, 10 minutes on each
axis
Mechanical shock in operation 50 g, 11 ms, half sine
Dimensions 199 x 98 x 40 mm
Weight 624 g
Arbitrary Waveform Generator:
Waveform Frequency Sine: 1Hz-25MHz; Square: 1Hz-10MHz;
Ramp: 1Hz-1MHz; Expon: 1Hz-5MHz
Sampling rate 250 MSa/s
Amplitude 2.5 Vpp (50Ω)/5Vpp (High impedance)
Frequency resolution 0,1 %
Channel CH1 waveform output
Waveform depth 512Sa
Vertical resolution 12 bit
Output impedance 50 Ω
Square Characteristics:
Pulse width accuracy ± 10 ns
Digital Multimeter:
Maximum resolution 4000 Counts
Testing Modes: Voltage, Current, Resistance, Capacity, Diode,
On-O
Maximum Input Voltage AC: 600 V/ DC: 600 V
Maximum Input Current AC: 10 A / DC: 10 A

Range Accuracy Resolution
DC Voltage
400.00mV
±（0.8% + 5）
100uV
4.000V 1mV
40.00V 10mV
400.0V 100mV
600.0V ±（1% + 2）1V
Overload protection:
400mV: 250V, other: 600Vrms.
AC Voltage
4.000V
±（1.2% + 5）
1mV
40.00V 10mV
400.0V 100mV
600.0V ±（1.5% + 5）1V
Frequency: 40Hz~400Hz;
Frequency of 400V and 600V: 40Hz~100Hz
DC Current
40.00mA ±（1% + 2）10uA
200.0mA ±（1.5% + 2）100uA
4.000A ±（1.8% + 2）1mA
10.00A ±（3% + 2）10mA
Overload protection:
self restoring fuse: 200mA/250V, 4A and 10A range no fuse.
AC Current
40.00mA ±（1.3% + 2）10uA
400.0mA ±（1.8% + 2）100uA
4.000A ±（2% + 3）1mA
10.00A ±（3% + 5）10mA
Frequency: 40Hz~400Hz;
self restoring fuse: 200mA/250V, 4A and 10A range no fuse.
Resistance
400.0Ω±（1% + 3）0.1Ω
4.000KΩ
±（1.2% + 5）
1Ω
60.00KΩ10Ω
400.0KΩ100Ω
4.000MΩ1KΩ
40.00MΩ±（1.5%±3）10KΩ
Overload protection: 220Vrms
Capacity
40.00nF
±（3% + 5）
10pF
400.0nF 100pF
4.000uF 1nF
40.00uF 10nF
100.0uF 100nF
Overload protection: 220Vrms
Diode 0V~1.0V
On-O <50Ω

All specifications herein mentioned apply to the series oscilloscopes. Before
checking an oscilloscope to see if it complies with these specifications, make sure
it meets the following conditions:
The oscilloscope must have been operating continuously for twenty minutes un-
der the specified operating temperature.
The Do Self Cal operation must be performed through the Utility menu if the oper-
ating temperature changes by more than 5°C.
The oscilloscope must be within the factory calibration interval.
All specifications are guaranteed unless noted ‘typical’.
This Oscilloscope is a small, lightweight portable instrument which provides the
user with a convenient and easy to operate front panel with which you can per-
form basic tests.
• General Inspection:
Please check the instrument as following steps aer receiving:
Check the shipping container for damage: Keep the damaged shipping contain-
er or cushioning material until the contents of the shipment have been checked
for completeness and the instrument has been checked mechanically and electri-
cally.
Check the accessories: Accessories supplied with the instrument are listed in
"Accessories" in this manual. If the contents are incomplete or damaged, please
notify the franchiser.
Check the instrument: In case there is any mechanical damage or defect, or the
instrument does not operate properly or fails performance tests, please notify
your reseller.
• Use of safety keyhole:
A safety keyhole is reserved on the
back shell of the oscilloscope. Users
need to purchase the safety lock by themselves. Wrap one end of the safety lock
around a hard-to-move object, insert the other end into the safety lock hole, turn
the key clockwise to lock the instrument, and then pull out the key. In this way,
the most basic anti-the requirements can be achieved.
4. GETTING STARTED

Adjust the bracket
When using the instrument, you can open the
support foot to tilt the instrument upward for
easy operation and observation. When the
instrument is not in use, the user can close the
support foot to facilitate placement or han-
dling.
Aer adjusting the rack, the instrument can be
suspended on the vertical plane.
• Front Panel
The following diagram briefly describes the
front panel of this oscilloscope.

• The user interface
• Functional Check
Follow the steps below to perform a quick functional check to your oscilloscope.
Power
Press the power key and the device starts. Press the power key again, and the de-
vice will shut down. Before starting it, please confirm that the battery has enough
power. The oscilloscope is supplied with a power adapter with USB-Type-C plug.
The input AC power supply is 100~240V, 50~60Hz. The output is 5V@2A. The power
adapter can be used to supply the oscilloscope or charge the battery.
When connect the power adapter to the oscilloscope, if the battery is not installed
inside the oscilloscope, the power key backlight is red and flash; if the battery is
installed inside the oscilloscope and the battery power is not filled, the power key
backlight is red; if the battery is installed inside the oscilloscope and the battery
power is full, the backlight of the source key is extinguishes.
Observe the waveform
1. Set the switch on the probe to 1X and connect the probe to Channel 1 on the
oscilloscope. First, align the slot in the probe connector with the protuberance on
the CH1 BNC and push to connect; then, turn to right to lock the probe in place.
2. If you use the probe hook-tip, the hook end should be removed, the probe pin
should be inserted into the Gen Out output terminal, and the probe grounding
clamp should be clamped on the metal outer ring of the Gen Out output terminal.
Recommended input ~2V@1KHz peak-peak square wave.

3. Press the Auto button and you should see within a few seconds a square wave
of about 2V peak-to-peak at 1KHz in the display. Repeat the steps to observe CH2.
• Probe check
Safety
When using the probe, keep your fingers behind the
guard on the probe body to avoid electric shock. Do
not touch metallic portions of the probe head while it
is connected to a voltage source. Connect the probe to
the oscilloscope and connect the ground terminal to
ground before you start any measurements.
Manual Probe Compensation
Upon the first connection of a probe and an input channel, you should manually
perform this adjustment to match the probe to the input channel. Uncompensated
or wrong compensated probes may lead to errors or faults in measurement. To
adjust the probe compensation, follow the steps below.
1. Press Channel button to enter channel setting menu, Set the Probe option at-
tenuation in the channel menu to 10X. Set the switch on the probe to 10X and con-
nect the probe to Channel 1 on the oscilloscope. If you use the probe hook-tip, the
hook end should be removed, the probe pin should be inserted into the Gen Out
output terminal, and the probe grounding clamp should be clamped on the metal
outer ring of the Gen Out output terminal. The oscilloscope with signal generator
function needs to set output signal as 2V @ 1KHz square wave; The Gen Out termi-
nal of the oscilloscope without signal generator function automatically outputs 2V
@ 1KHz square wave. Press the Auto button.
2. Check the shape of the displayed waveform.
3. If necessary, use a nonmetallic screwdriver
to adjust the variable capacity of your probe
until the shape of the waveform turns to be
the same as the above figure. Repeat this step
as necessary. See the figure below for the way
of adjustment.
Probe Attenuation Setting: Probes are of
various attenuation factors which aect the
vertical scale of the signal. The Probe Check
function is used to verify if the Probe attenua-
tion option matches the attenuation of the probe.
Compensated correctly
Overcompensated
Undercompensated