ZOYI ZT-703S User manual

User Manual
All rights reserved; offenders will be prosecuted.
Specifications are subject to change without prior notice.

Limited Warranty and Scope of Rights and
Responsibilities
This product is eligible for a one-year
warranty from the date of purchase.
This warranty does not cover blown fuses,
damage to general accessories, or damage
caused by accidents, negligence, misuse,
modifications, pollution, and abnormal
operating environments.
Note: If there is a situation of freezing or
crashing during use, please restart.

Table of Contents
Title Page
Overview......................................................1
Safety Instructions...........................................1
Main Interface................................................3
Oscilloscope Mode Main Interface........................4
Panel Function Keys.....................................7
MENU interface..........................................8
Oscilloscope Functions Introduction...........................9
Probe Inspection........................................9
Safety..................................................9
Manual Compensation.....................................9
Probe Attenuation Setting..............................10
Channel Settings.......................................11
Auto Setup.............................................12
Vertical System........................................13
Horizontal System......................................13
Trigger System.........................................14
Numeric Measurement....................................15
XY Display Mode........................................16
Persistence Time.......................................16
Formatting.............................................16
Backlight Time.........................................16
Cursor Measurement.....................................17
How to Save and Review Measurement
Waveforms..............................................18

Operating Modes........................................19
Backlight Brightness...................................19
Baseline Calibration...................................19
Signal Generator Output Waveform Settings....................20
Multimeter Functions Introduction............................22
LCD Display Screen.....................................22
Multimeter Input Ports.................................24
Measurement Methods....................................25
Measurement of AC and DC Voltage.......................25
Measurement of AC and DC Current.......................25
Measuring Resistance...................................26
Measuring Continuity...................................26
Measuring Diodes.......................................27
Measuring Capacitance..................................27
Multimeter Extension Functions...............................28
Maintenance and Care.........................................29
Cleaning the Product.........................................29
Battery Charging.............................................29
Battery Storage..............................................30
Fuse Replacement.............................................30
Technical Specifications.....................................31
General Mechanical Environmental
Specifications...............................................31
Multimeter Specifications.............................32
Oscilloscope Specifications............................35

Overview
This handheld oscilloscope adopts a dual injection molding process,
featuring a beautiful appearance, compact size, convenient portability,
and flexible operation. The functional buttons have a clear and intuitive
menu interface. The screen utilizes a 3.5-inch IPS full-view color display,
with a multimeter display of up to 25,000 counts. This product
integrates the functions of an oscilloscope, signal generator, and
multimeter into a three-in-one device. With superior performance and
powerful functionality, it can be used in various measurement
scenarios, meeting a wide range of user measurement needs.
Safety Instructions
To avoid possible electric shock, fire hazards, and personal injury,
please read the safety precautions before using. Use the product only
for its designated purpose, as using it otherwise may compromise the
protection it provides.
Before using the product, check the housing for cracks or plastic
damage. Carefully inspect the insulation near the input ports. Follow
the instructions in this user manual, use the correct input ports, and set
the appropriate range as specified in this user manual for accurate
measurements.
Do not use this product in the presence of explosive gases and vapors or in
humid environments. Keep your fingers behind the protective shield of the
test probe.
1

•Do not touch unused input ports when the product is connected to
the circuit under test. Disconnect the test probes and the circuit
before changing the test range.
•When the DC voltage under test is higher than 36V, or the AC
voltage is higher than 25V, it may cause serious harm to the human
body; users should be cautious to avoid electric shock.
•Select the correct test range and scale to prevent damage to the
instrument or personal injury.
•Do not use this product with the front or rear cover open.
•Low battery voltage may affect the accuracy of test results; please
recharge promptly.
•The ground line between the two channels is the same, and during
measurements, the ground clip is always grounded or connected to
the same potential.
•The ground wire of the probe is at the same potential as the
ground. When connecting the USB cable for charging, it is
prohibited for the ground wire of the probe to touch high voltage,
as this may result in damage to the product or pose a risk of
injury.
•When using an oscilloscope probe to measure voltage higher than
(AC25V or DC36V), ensure that the USB protective cover of the
product is securely closed to prevent human contact with exposed
metal parts, as this could lead to the possibility of injury.
2

Main Interface
CH2 Input CH1 Input
USB
Interface
Display
Screen
Keys
Pad
Multimeter
Measurement
Input
Terminal
Signal
Generator
Output
Port
3

4
Oscilloscope Mode Main Interface
①②③④⑤ ⑥⑦
⑧⑨
⑩
⑪
⑫⑬⑭⑮
⑯
⑰
⑱
1
Operating
Status
Display
RUN: Automatic waveform acquisition state
WAIT: Normal trigger mode, blinking waiting
for trigger signal
T.D: Captured triggered waveform data
STOP: Lock the current waveform, acquisition
stopped
2Time Base
Window
Display current time base position within the
storage depth
3Time Base
Scale
Display the current set horizontal time base
scale value
4Trigger Trigger Channel：1 for CH1, 2 for CH2

5
7Battery
Level
Displaying the current battery status
and charging status.
8Horizontal
Trigger
Displaying the current horizontal
time base position triggered.
9Channel1 Showing the waveform of CH1 in
yellow.
10 Vertical
Trigger
Displaying the current vertical
voltage position triggered.
11 Channel 2 Showing the waveform of CH2 in blue.
12
Voltage/
Time Menu
(VOL/TIME)
In this menu, you can adjust channel
voltage and time base as follows:
Press F1 to switch channels; the menu
color will indicate the current
channel's color setting.
Press the up arrow to increase
voltage amplitude, and the down arrow
to decrease it.
Press the left arrow to decrease time
scale value, and the right arrow to
increase it.
13
Waveform
Movement
(MOVE)
Press F1 to switch channels; the menu
color will indicate the current
channel's color setting. Use the
arrow keys to adjust the waveform
position.
5Trigger
Mode
Display the current trigger mode as rising
edge or falling edge
6Level Display the current set trigger voltage value

6
14
Trigger
Cursor
(TRIGGER)
Press the up/down keys to adjust the
vertical trigger position and the
left/right keys to adjust the
horizontal trigger position.
15 Measurement
Cursor
Press this key to select the cursor
axis that needs adjustment.
16 CH1 Voltage Displaying the coupling mode and
voltage scale of Channel 1.
17 CH2 Voltage Displaying the coupling mode and
voltage scale of Channel 2.
18
Signal
Generator
Status
Showing the corresponding waveform
shape symbol and frequency setting
parameters according to the current
output status of the signal
generator, including square wave,
pulse wave, sine wave, and triangle
wave.

F1-F4 Keys: Correspond to the four
functional menus displayed on the screen, and you can select
the respective function by pressing the keys.
Power Button: Long press for 2 seconds to power on/off;
in multimeter mode, a short press enters relative value (REL)
measurement.
AUTO/RANGE Key: In the oscilloscope interface, a short
press of this key automatically acquires measurement
waveforms; in the multimeter interface, a short press toggles
between automatic and manual range selection.
HOLD/SAVE Key: In the oscilloscope interface, a short press
toggles STOP/RUN functionality, and a long press saves
measurement waveform data; in the multimeter interface, a
short press is for data hold/cancel hold functionality.
MODE Key: Pressing this key switches between
oscilloscope mode and multimeter mode.
Arrow Keys: The up, down, left, and right arrow keys are
used to incrementally adjust relevant settings, move
cursor positions, and navigate menu selections.
Panel Function Keys
MENU Key: Pressing this key brings up the system
function menu on the screen, comprising three pages that can
be navigated using the left and right arrow keys.
7

Main Menu
MENU Interface
8
The first page
Channel Settings menu
The second page
Trigger Setup menu
The third page
Auxiliary Functions
menu
The fourth page
Auxiliary Functions
menu
The fifth page
Extended Functions
menu
The sixth page
Extended Functions
menu
Note: The descriptions below for the menu interface are
abbreviated as follows: Main Menu, Page 1 Menu, Page 2 Menu,
Page 3 Menu, Page 4 Menu, Page 5 Menu, Page 6 Menu.

Introduction to Oscilloscope Functions
Probe Check
Safety:
When using the probe, to avoid electric shock, ensure that your
fingers are kept behind the safety collar on the probe body. Do not
touch the metal parts on the top of the probe when it is connected to
a high-voltage source. The measured voltage should not exceed the
specifications of the probe (maximum 150V for the 1X range,
maximum 300V for the 10X range), as this may damage the
instrument.
Manual Probe Compensation
When connecting the probe to the oscilloscope for the first time, it is
recommended to perform the following compensation check. Probes
that have not been compensated or have compensation deviations
may result in measurement errors. If probe compensation is required,
please follow these steps:
1. Power on and connect the probe to the signal input terminal,
inputting a 4V/1KHz square wave signal.
2. After connecting, press the AUTO key on the panel and check the
waveform display status.
Overcompensation
Undercompensation
9
Compensation Normal
safety ring

3, If it is necessary to cooperate with the adjustment, you can adjust
the capacitance on the probe to change the compensation state; the
adjustment tool is the accessory adjustment rod that comes with the
probe or a suitable non-metallic handle adjustment rod. The
adjustment method is as shown in the figure below
Probe attenuation setting
The probe attenuation coefficient setting will affect the vertical scale
reading of the signal. Make sure that the multiple of the attenuation
switch on the probe matches the multiple of the probe attenuation
option in the system settings of the oscilloscope. When the multiple of
the switch is set to X1, the multiple of the oscilloscope is set to X1, and
when the multiple of the switch is set to X10, the multiple of the
oscilloscope is set to X10.
Remarks: When the probe is set to y1, the probe marked with aspecifi
cation of 6M2/X1 will limit the bandwidth of the oscilloscope to 6MM inp
ut. To use the full band of the oscilloscope, make sure to set the switch
to 10 or use aprobe with ahigher specification.
X1 X10 Adjustment switch
10
Introduction to Oscilloscope Functions

Introduction to Oscilloscope Functions
Channel Settings
1. Press F1 to switch between CH1 and CH2, selecting the channel
that needs to be configured.
2. Press F2 to toggle between open and closed. When open, the
screen displays the waveform of the current channel, and when
closed, the screen does not display the current channel waveform.
3. Press F3 to select the coupling mode for the channel as DC or AC.
4. Press F4 to switch the probe attenuation between X1 and X10.
This setting should match the attenuation switch on the
oscilloscope probe; set the oscilloscope to X1 if the switch is set to
X1 and X10 if the switch is set to X10.
Automatic Setup
When encountering uncertain waveforms during the measurement
process or wishing to avoid tedious manual settings, press the
AUTO key. The oscilloscope will automatically identify the
waveform type (sine or square wave) and adjust the control mode
to accurately display the waveform of the input signal.
11
Press the MENU
key to display
the first page of
the channel
settings menu

Introduction to Oscilloscope Functions
Vertical System
The vertical system can be used to set the voltage amplitude, scale
size, and position of the waveform.
Vertical voltage scale setting: Press the F1 key on the oscilloscope's
main interface to select the Voltage/Time menu. Use the panel's
upper direction key to increase the voltage setting and the lower
direction key to decrease the voltage setting.
Probe attenuation setting for X1: Adjustment range from 20mV/div
to 10V/div
Probe attenuation setting for X10: Adjustment range from
200mV/div to 100V/div
Vertical position: Press the F2 key on the main interface to select
the Waveform Move menu. Use the upper direction key to move
the waveform position up and the lower direction key to move it
down.
Horizontal System
Press the F1 key on the main interface to select the Voltage/Time
menu.
1. Horizontal scale: Use the left and right direction keys to change
the horizontal scale (time base). When changing the horizontal
scale, the waveform will zoom in or out relative to the screen
center. The right direction key decreases the time base, and the left
direction key increases the time base.
2. Horizontal position: Select the Waveform Move menu, use the
left and right direction keys to move the waveform position left or
right. Long-press the MENU key to return the horizontal cursor to
the center (0-time base) position.
12

Introduction to Oscilloscope Functions
3. Scroll Mode: When the horizontal time base is set to 200ms/div, the
oscilloscope automatically enters Scroll Mode. In Scroll Mode,
triggering and horizontal position settings are not controlled; the
waveform scrolls from left to right. Scroll Mode is suitable for low-
speed signals and allows for long-term observation of waveform
changes according to measurement needs.
Trigger System
In oscilloscope measurements, it is often necessary to observe and
analyze waveforms that exhibit specific or prominent differences
(continuous or instantaneous). This can be achieved by configuring the
trigger system. When the acquired signal meets the set conditions, the
system automatically captures and displays the current waveform on
the screen.
Trigger Cursor Setting:
Press the F3 key on the main interface to select the Trigger Cursor
menu. Use the left and right direction keys to adjust the horizontal
trigger cursor position and the up and down direction keys to adjust the
vertical trigger cursor position. During adjustment, the trigger level
value in the upper right corner of the screen will change accordingly
(the trigger level value is referenced to the horizontal baseline
position).
Trigger Mode Setting:
On the second menu, press F1 to select the trigger mode.
13
Press the MENU
key, and then press
the right direction
key to enter the
second-page
trigger system
menu.

Oscilloscope Functions Introduction
1. Auto: Auto triggering continuously refreshes the waveform record inreal-
time, without the waveform pausing.
2. Normal: When the amplitude of the captured signal reaches the set trigger
level, the trigger system locks and holds the waveform on the screen. The
oscilloscope continues continuous acquisition, updating the waveform on the
screen with each trigger event, creating continuous triggering.
3. Single: When the amplitude of the captured signal reaches the set trigger
level, the trigger system locks and holds the waveform on the screen. The
waveform acquisition is completed, and the oscilloscope enters the STOP
state, stopping signal acquisition. To trigger again, press HOLD to cancel
STOP and enter the waiting-trigger state.
Trigger Edge:
On the second-page menu, press F2 to select the trigger edge and set it to
rising or falling.
Rising Edge Trigger: The trigger system recognizes the rising process of the
signal amplitude. When the amplitude reaches the trigger level, the trigger is
activated.
Falling Edge Trigger: The trigger system recognizes the falling process of the
signal amplitude. When the amplitude reaches the trigger level, the trigger is
activated.
Trigger Source Setting:
Based on measurement needs, press F3 to select the trigger source, choosing
between CH1 or CH2.
Trigger Position:
Press F4 to automatically adjust the trigger position to the 50% middle
position.
14
Rising
Edge
Falling
Edge
Trigger
Level
Trigger
Point
Trigger
Point

Oscilloscope Functions Introduction
Numeric Measurement:
15
Press the MENU
key and then
press the right
direction key to
enter the sixth-
page menu
Automatic Measurement: When measuring an unknown signal
waveform, press the AUTO key, and the measurement system
will automatically recognize and adjust the waveform
amplitude and time base. It will then display the matched
waveform on the screen.
Manual Measurement: Manually set parameters such as
predicted waveform voltage, time base, cursor position,
trigger, coupling mode, and probe attenuation. Connect the
measurement circuit with the oscilloscope probe to observe
the waveform and related measured values.
Numeric Display: Press the F3 key to bring up the relevant
numerical options on the screen. The measured values include
peak-to-peak value, maximum value, minimum value, root
mean square, frequency, duty cycle, period, and frequency
meter – a total of 8 groups of values. Due to limited screen
space, CH1 and CH2 can display up to 4 groups of values each.
You can check the desired values according to measurement
needs, press F4 to exit after selection, and the screen will
display the selected measured values.

Oscilloscope Functions Introduction
XY Display Mode:
Enter the fifth page of the extended function menu and press F1 to
select the X-Y display mode. At this point, the screen switches to the
vertical display of CH1 and CH2. Based on the frequency ratio and
phase difference of the measured signals from CH1 and CH2, it
generates various shapes and changes in Lissajous patterns.
16
Persistence Time:
Enter the fifth page of the extended function menu and press F2 to
select the persistence time. Adjust the persistence time according to
measurement needs: minimum, 500ms, 1S, 10S, infinite.
Format:
Enter the fifth page of the
extended function menu and
press F3 to format. After
completion, it will clear the
saved waveform images.
Backlight Time:
Enter the fifth page of the
extended function menu and
press F4 to set the backlight off
time: 30S, 60S, 120S, Off
(infinite).