HDS120 - Multimeter Owon - Free user manual and instructions

Product Type	Handheld Digital Multimeter with Oscilloscope
Brand	Owon
Model	HDS120
Dimensions	188 mm (L) x 93 mm (W) x 41.5 mm (D)
Weight	Approximately 0.33 kg (without battery)
Power Supply	Single 18650 3.7V lithium battery, rechargeable via USB-C
Display	2.8-inch IPS color LCD, 320x240 resolution
Multimeter Functions	DC/AC Voltage, DC/AC Current, Resistance, Continuity, Diode, Capacitance, Frequency, Duty Cycle
Oscilloscope Bandwidth	1 MHz (AC coupled)
Oscilloscope Sample Rate	5 MSa/s
Oscilloscope Channels	1
Input Impedance	≥10 MΩ
Safety Rating	CAT III 1000V
Maximum Voltage Input	1000 VDC or 750 VAC RMS
Maximum Current Input (A terminal)	10 A (fused, 2 minutes max per 10 minutes)
Maximum Current Input (mA terminal)	600 mA (fused)
Battery Life	Approximately 24 hours (discharging), 2.5 hours charging
Operating Temperature	0°C to 40°C
Storage Temperature	-10°C to 60°C
Accessories Included	Test leads, quick guide, USB-C cable
Warranty	1 year from date of purchase
Maintenance	Clean with soft damp cloth; do not use abrasive chemicals

Frequently Asked Questions - HDS120 Owon

How do I measure DC voltage with the HDS120?

Turn the rotary switch to the voltage measurement position (≈V). Press the function key to select DC voltage (V,DC or mV,DC). Connect the black test lead to COM and the red test lead to VΩ→H terminal. Probe the test points and read the display. Ensure not to exceed 1000 VDC.

How to replace the battery?

Turn off the meter and remove test leads. Lift the tilt stand, loosen the screws, and remove the battery cover. Insert a new 18650 3.7V lithium battery observing polarity. Replace the cover and tighten screws. Only use specified battery type.

What is the warranty period?

The Owon HDS120 comes with a 1-year warranty from the date of purchase by the original purchaser. It covers defects in materials and workmanship. Warranty is not transferable.

How do I use the oscilloscope function?

Press the OSC/DMM key to switch to oscilloscope mode. Connect the test lead to the VΩ→H terminal. Use the auto-set feature (AUTO) for quick waveform display. Adjust time base and amplitude using the direction keys. Trigger settings can be configured via the trigger menu.

Can I measure current above 10 A?

No, the maximum current input is 10 A for the A terminal (fused) and 600 mA for the mA terminal. Do not exceed these limits to avoid damage. For currents above 10 A, use a suitable current clamp or external shunt.

How to clean the device?

Disconnect all leads and power off. Use a soft, slightly damp cloth (with water or mild detergent) to wipe the exterior. Do not allow liquid to enter the device. Avoid abrasive or chemical cleaners. Ensure the device is completely dry before re-energizing.

What does the 'OL' display mean?

'OL' stands for Overload. It indicates the input signal exceeds the selected range. Switch to a higher range or use auto-ranging to obtain a valid measurement.

How to enable the backlight?

Press the power button (⏻) briefly to turn on the meter; the backlight is on by default. To adjust brightness, go to System Settings > Display > Brightness and select High, Mid, or Low.

What is the input impedance of the oscilloscope?

The oscilloscope input impedance is approximately 10 MΩ. This is suitable for most general-purpose probing without significantly loading the circuit.

How to reset the device to factory settings?

Press the system settings key (gear icon), navigate to System > Reset, then press AUTO. The screen will prompt 'Reset settings Press again'. Press AUTO again to confirm. The device will restart and restore default settings.

USER MANUAL HDS120 Owon

For product support, visit:www.owon.com.hk/download

※: The illustrations, interface, icons and characters in the user manual may be slightly different from the actual product. Please refer to the actual product.

Copyright © LILLIPUT Company. All rights reserved.

The LILLIPUT's products are under the protection of the patent rights, including ones which have already obtained the patent rights and those which are applying for. The information in this manual will replace all materials published.

The information in this manual was correct at the time of printing. However, LILLIPUT will continue to improve products and reserves the rights to change specification at any time without notice.

owon ^® is the registered trademark of the LILLIPUT Company.

Fujian LILLIPUT Optoelectronics Technology Co., Ltd.

No. 19, Heming Road

Lantian Industrial Zone, Zhangzhou 363005 P.R. China

Tel: [phone] Fax: [phone]

Web: www.owon.com E-mail: [e-mail]

General Warranty

We warrant that the product will be free from defects in materials and workmanship for a period of 1 years from the date of purchase of the product by the original purchaser from our company. This warranty only applies to the original purchaser and is not transferable to a third party.

If the product proves defective during the warranty period, we will either repair the defective product without charge for parts and labour, or will provide a replacement in exchange for the defective product. Parts, modules, and replacement products used by our company for warranty work may be new or reconditioned like new. All replaced parts, modules and products become the property of our company.

In order to obtain service under this warranty, the customer must notify our company of the defect before the expiration of the warranty period. Customer shall be responsible for packaging and shipping the defective product to the designated service centre, a copy of the customers proof of purchase is also required.

This warranty shall not apply to any defect, failure or damage caused by improper use or improper or inadequate maintenance and care.

We shall not be obligated to furnish service under this warranty a) to repair damage resulting from attempts by personnel other than our company representatives to install, repair or service the product; b) to repair damage resulting from improper use or connection to incompatible equipment; c) to repair any damage or malfunction caused by the use of not our supplies; or d) to service a product that has been modified or integrated with other products when the effect of such modification or integration increases the time or difficulty of servicing the product.

Please contact the nearest Sales and Service Offices for services.

Excepting the after-sales services provided in this summary or the applicable warranty statements, we will not offer any guarantee for maintenance declared or hinted, including but not limited to the implied guarantee for marketability and special-purpose acceptability. We should not take any responsibilities for any indirect, special, or consequent damages.

TABLE OF CONTENTS

1.SAFETY INFORMATION ....1

General Safety Requirements ...... 1

Measurement Category ....3

Safety Terms and Symbols 4

2. QUICK START ....5

General Inspection....5

Install the Batteries....5

Adjusting the Tilt Stand 6

Power on/off....6

Selecting the Range....7

Measurement Connections....7

3.INSTRUMENT PANEL 8

Front Panel and Keys 8

Side Panel....10

4.HOW TO USE THE MULTIMETER 11

About This Chapter....11

Instrument Interface 11

Input terminals.... 13

Making Measurements....13

Measuring AC or DC Voltage 13

Measuring Resistance....14

Measuring Continuity....15

Measuring Diodes 16

Measuring Capacitance 16

Measuring Frequency 17

Measuring DC or AC Current 18

Multimeter Features....19

Setting Scale 19

Setting Range 19

Making MAX/MIN Measurements 20

Making Comparative Measurements ....20

Value Hole Mode 21

Making Relative Measurements....22

5.HOW TO USE THE OSCILLOSCOPE ....23

Introduction to the User Interface of the Oscilloscope 23

Measuring System....25

Automatic Measurement....25

Trigger System 26

Save and Recall Picture 28

System Settings....29

6.TECHNICAL SPECIFICATIONS 33

Multimeter Specification....33

Oscilloscope Specification 35

General Specification 35

7.APPENDIX 37

Appendix A: List of Accessories 37

Appendix B: Maintenance and Cleaning 37

General maintenance 37

Charging and Replacement of Battery 38

Replacement of Lithium Battery 38

1. Safety Information

(Be sure to read the safety information before using this) product.

General Safety Requirements

Before any operations, please read the following safety precautions to avoid any possible bodily injury and prevent this product or any other products connected from damage. In order to avoid any contingent danger, this product is only used within the range specified.

■ Limit operation to the specified measurement category, voltage, or amperage ratings.
■ Do not use the oscilloscope meter if it is damaged. Before you use the oscilloscope meter, inspect the case. Look for cracks or missing plastic. Pay particular attention to the insulation surrounding the connectors.
■ Do not use the test leads provided for other products. Use only the certified test leads specified for this product.
■ Inspect the test leads for damaged insulation or exposed metal.
■ Before use, verify the oscilloscope meter's operation by measuring a known voltage.
■ Only the qualified technicians can implement the maintenance.
■ Always use the specified battery type. The power for the oscilloscope meter is supplied with a battery. Observe the correct polarity markings before you insert the batteries to ensure proper insertion of the batteries in the oscilloscope meter.
■ Check all Terminal Ratings. To avoid fire or shock hazard, check all ratings and markers of this product. Refer to the user's manual for more information about ratings before connecting to the oscilloscope meter.
■ Do not operate the oscilloscope meter with the cover or portions of the cover removed or loosened.
■ Use Proper Fuse. Use only the specified type and rating fuse for the oscilloscope meter.
■ Do not operate if in any doubt. If you suspect damage occurs to the

oscilloscope meter, have it inspected by qualified service personnel before further operations.

■ Do not operate this product in wet or damp conditions.
■ Do not operate in an explosive atmosphere.
- Keep product surfaces clean and dry.
■ Do not apply more than the rated voltage (as marked on the oscilloscope meter) between terminals, or between terminal and earth ground.
■ When measuring current, turn off the circuit power before connecting the oscilloscope meter in the circuit. Remember to place the oscilloscope meter in series with the circuit.
■ When servicing the oscilloscope meter, use only the specified replacement parts.
■ Use caution when working above 60 V DC, 30 V AC RMS, or 42.4 V peak. Such voltages pose a shock hazard.
■ When using the test leads, keep your fingers behind the finger guards on the test leads.
■ Remove the test leads from the oscilloscope meter before you open the battery cover.
■ To avoid false readings, which may lead to possible electric shock or personal injury, replace the battery as soon as the low battery indicator appears and flashes.
■ Disconnect circuit power and discharge all high-voltage capacitors before testing resistance, continuity, diodes, or capacitance.
■ Use the proper terminals, function, and range for your measurements.

When the range of the value to be measured is unknown, set the rotary switch position as the highest range, or choose the auto ranging mode. To avoid damages to the oscilloscope meter, do not exceed the maximum limits of the input values shown in the technical specification tables.

■ Connect the common test lead before you connect the live test lead. When you disconnect the leads, disconnect the live test lead first.

■ Before changing functions, disconnect the test leads from the circuit under test.

Measurement Category

The oscilloscope meter has a safety rating of 1000 V, CAT III.

Measurement category definition

Measurement CAT I applies to measurements performed on circuits not directly connected to the AC mains. Examples are measurements on circuits not derived from the AC mains and specially protected (internal) mains-derived circuits.

Measurement CAT II applies to protect against transients from energy-consuming equipment supplied from the fixed installation, such as TVs, PCs, portable tools, and other household circuits.

Measurement CAT III applies to protect against transients in equipment in fixed equipment installations, such as distribution panels, feeders and short branch circuits, and lighting systems in large buildings.

Measurement CAT IV applies to measurements performed at the source of the low-voltage installation. Examples are electricity meters and measurements on primary over current protection devices and ripple control units.

Safety Terms and Symbols

Safety Terms

Terms in this Manual. The following terms may appear in this manual:

Warning: Warning indicates the conditions or practices that could result in personal injury or death.

Caution: Caution indicates the conditions or practices that could result in damage to this product or other property.

Terms on the Product. The following terms may appear on this product:

Danger: It indicates an injury or hazard may immediately happen.

Warning: It indicates an injury or hazard may be accessible potentially.

Caution: It indicates a potential damage to the instrument or other property might occur.

Safety Symbols

Symbols on the Product. The following symbol may appear on the product:

	Direct current (DC)		Fuse
	Alternating current (AC)		Caution, risk of danger (refer to I manual for specific Warning or Caution information)
	Both direct and alternating current		Category I overvoltage protection
	Ground terminal		Category II overvoltage protection
	Conforms to European Union directives		Category III overvoltage protection
	Equipment protected throughout by double insulatic or reinforced insulation		Category IV overvoltage protection

2. Quick Start

General Inspection

After you get a new oscilloscope meter, make a check on the instrument according to the following steps:

1. Check whether there is any damage caused by transportation.

If it is found that the packaging carton or the foamed plastic protection cushion has suffered serious damage, do not throw it away first till the complete device and its accessories succeed in the electrical and mechanical property tests.

1. Check the Accessories.

The supplied accessories have been already described in the Appendix A: Enclosure of this Manual. You can check whether there is any loss of accessories with reference to this description. If it is found that there is any accessory lost or damaged, please get in touch with our distributor responsible for this service or our local offices.

1. Check the Complete Instrument.

If it is found that there is damage to the appearance of the instrument, or the instrument can not work normally, or fails in the performance test, please get in touch with our distributor responsible for this business or our local offices. If there is damage to the instrument caused by the transportation, please keep the package. With the transportation department or our distributor responsible for this business informed about it, a repairing or replacement of the instrument will be arranged by us.

Install the Batteries

The oscilloscope meter is powered by a 3.7V (18650) battery.

Warning: To avoid false readings, which could lead to possible ele shock or personal injury, please stop using and connect the device to the power supply for charging or replace the ba as soon as the low battery indicator appears.

Before replacing the battery, turn off the meter, disconnect

leads and any connectors from any circuit under test, rem test leads from the input terminals. Use only the specified battery type.

Note: When charging, disconnect test leads from the input to open the charging cover and charge the device.

Use the following procedure to install the battery:

(1) Power off, remove test leads and any connectors from the input terminals.
(2) Lift the tilt stand and loosen the screws with a suitable Phillips screwdriver and remove the battery cover.
(3) Observe the battery polarity indicated inside the battery compartment, Insert the battery.
(4) Place the battery cover back in its original position and tighten the screws.

Caution: To avoid instruments being damage from battery leakage, remove the batteries and store them separately if the oscilloscope meter is not going to be used for a long pe

Adjusting the Tilt Stand

Pull the tilt stand outward to its maximum reach (about 85^ to the meter body).

Power on/off

It can be turned on in the following ways:

• Press the ⏻ button at the bottom left of the host;
  ● Power on automatically when plugged in;
  ● Power on automatically after battery installation.

Note:

After the first boot, Reset, or battery removal, you will need to configure the date and time manually. Please refer to page 29 for detailed instructions on "System Settings", specifically under the Date | Time section.

It can be turned off in the following ways:

- Manual shutdown,tap and hold ⏻ button (when the power is connected,

the shutdown will enter the standby mode);

● Automatic shutdown, emit a short beep one minute before shutdown, emit a long beep during shutdown;
● Low power automatic shutdown.

Selecting the Range

• Auto ranging is set as default when the meter is powered on, Auto is displayed.
• Under automatic range, press to enter the manual range mode.
• Under manual range, each additional press of sets the oscilloscope meter to the next higher range; each additional press of sets the oscilloscope meter to the next lower range.
• Under manual range, press 📄 inter the auto range mode.

Note: Manual range is not available when measuring capacitance.

Measurement Connections

After selecting the desired measurement function, to avoid instrument damage, do not discretionarily switch the measurement function when measuring.

3.Instrument Panel

Front Panel and Keys

The front panel and keys of the oscilloscope meter are shown in Figure 3-1:

Figure 3- 1: Front panel

Description:

Num	Illustration in multimeter mode	Illustration in oscilloscope mode
1	Display area.
2	The F1 - F4 keys are multi-function keys. In each menu mode, the corresponding key to select the corresponding menu item.
3	Function key,press to select th corresponding function.	Only and function.
4	Comparative value key.	Trigger menu key.
5	Function of direction keys:used for changing range.Function ofRestore auto gear.	Function of direction keys:used for the amplitude scales.Function of direction keys:used for zooming waveforms and the time base changing.Function ofPerform automatic setup.
6	Relative value key.	Trigger value key,press it will automatically setting the trigger lev to half of the current signal's Vpp.
7	Enter the system settings key.
8	Image save key.
9	Measurement input port.
10	Value hold key.	Stop/Run key.
11	Long press to turn off, short press to turn on or display the s bar.
12	Switch key for working state of oscilloscope and multimeter.
13	Maximum and minimum value measurement button.	Measurement value display button.

Side Panel

Figure 3-2: Side panel

Description:

1. Charging or USB communication interface(Note: The measurement input port is not available when the interface is charging or communicating).
2. Bracket.

4.How to Use the Multimeter

About This Chapter

This chapter introduces the multimeter function and provides some basic examples of basic operations and how to use the menu.

Instrument Interface

The oscilloscope meter uses four 4-mm safety banana plug input ends: A mA、COM、VΩ→H.

Multimeter interface:

Multimeter interface

Description:
1. Measurement type indication:

Measurement type	Description
V,DC、mV,DC	DC voltage measurement
V,AC、mV,AC	AC voltage measurement
Res	Resistance measurement
Cont	On/Off measurement
Diode	Diode measurement
CAP	Capacitance measurement
Freq	Frequency measurement
uA,DC、mA,DC、A,DC	DC current measurement
uA,AC、mA,AC、A,AC	AC current measurement

1. Range indication: Manu means manual range; Auto means automatic range.
2. Current measurement range.
3. Time display.
4. Indicating that there is a USB cable inserted.
5. Automatic shutdown sign: Displays the flag when enabled. Closing will hide the identity.
6. Operation beep identification: Displays the flag when enabled. Closing will hide the identity.
7. Battery level and charge indication.
8. DC/AC/On-Off/Diode/Capacitance indication.
9. Main unit of measurement.
10. F1\~F4 operation menu.
11. Range simulation strip.
12. Main measurement value.
13. Secondary measurement value.

Measurement units

Sign	Description
M	Mega	1E+06	(1000000)
k	kilo	1E+03	(1000)
m	milli	1E-03	(0.001)
μ	micro	1E-06	(0.000001)
n	nano	1E-09	(0.000000001)

Sign	Description	Measurement type
V	Voltage	Voltage
A	Ampere	Current
	Ohm	Resistance
Hz	Hertz	Frequency
%	Percent	Duty cycle
F	Farad	Capacitance

Input terminals

The terminal connections for the different measurement functions of the oscilloscope meter are described in the table below.

Warning: Before starting any measurement, observe the rotary swit position of the oscilloscope meter, and then connect the leads to the correct terminals.

Caution: To avoid damaging the oscilloscope meter, do not exceed rated input limit.

Measurement key	Input terminals		Overload protection
			75(
			25(
			60(		f _i
	[287Y]	[2XY6]	10/	[60HH]	t _i

Making Measurements

Note: When the stylus is inserted into the measurement input port A, mA, VΩ→+1←, the instrument automatically switches to the default measurement type.

Measuring AC or DC Voltage

Warning: Do not measure any voltage of over 1000 Vdc or 750 V to avoid instrument damage or electric shock. Do not apply more than 1000 Vdc or 750 Vac rms between common terminal and the earth ground to avoid instrumen

damage or electric shock.

This oscilloscope meter displays DC voltage values as well as their polarity. Negative DC voltages will display a negative sign on the left of the screen.

1. Press ≈v to switch DC Voltage measurement mode, *,DC will be

displayed in the upper left corner denotes mV or .When press switch into AC Voltage measurement mode, *,AC will be displayed in the upper left corner denotes mV or .And then press to select mV or V measurement function,press to up and down measurement scales.

1. Connect the black test lead to the C-terminal and the red test lead to the terminal H-

DC/AC Voltage Measurement connect test leads:

1. Probe the test points and read the display.

Note: When measuring AC voltage, press F4 cycle through frequency measuring and original measuring.

Measuring Resistance

Caution: To avoid possible damage to your oscilloscope meter or equipment under test, disconnect the circuit power and discharge all high-voltage capacitors before measuring resistance.

1. Press to offer resistance testing mode, Res will be displayed in the upper left corner.

2. Connect the black test lead to the c o minal and the red test lead to

the terminal

Resistance Measurement connect test leads:

1. Probe the test points and read the display.

Measuring Continuity

Caution: To avoid possible damage to your oscilloscope meter or equipment under test, disconnect the circuit power and discharge all high-voltage capacitors before testing for continuity.

1. Press ☐ to enter continuity testing mode, Cont will be displayed in the upper left corner.

2. Connect the black test lead to the terminal and the red test lead to the terminal.

Continuity Measurement connect test leads:

1. Probe the test points to measure the resistance in the circuit. When the reading is below 5Ω, the oscilloscope meter will beep continuously.

Measuring Diodes

Caution: To avoid possible damage to your oscilloscope meter or equipment under test, disconnect the circuit power and discharge all high-voltage capacitors before testing diodes

1. Press to enter diode testing mode, Diode will be displayed in the upper left corner.
2. Connect the black test lead to the terminal and the red test lead to the terminal.

Diode Measurement connect test leads:

1. Connect the red test lead to the positive terminal of the diode and the black test lead to the negative terminal.

2. Read the diode forward bias. If the test lead connection is reversed, the oscilloscope meter will display "OL".

Measuring Capacitance

Caution: To avoid possible damage to the oscilloscope meter or to equipment under test, disconnect circuit power and discharge all high-voltage capacitors before measuring capacitance. Use the DC voltage function to confirm that the capacitor fully discharged.

1. Press to center capacitance testing mode, CAP will be displayed in the upper left corner.
2. Connect the black test lead to the terminal and the red test lead to

the terminal.

Capacitance Measurement connect test leads:

1. Probe the test points and read the display.

Measuring Frequency

1. Press to enter frequency measurement mode, Freq will be displayed in the upper left corner.
2. Connect the black test lead to the terminal and the red test lead to the terminal.

Frequency Measurement connect test leads:

1. Probe the test points and read the display.

2. Press to switch between the frequency and duty cycle measurements.

Note: When measuring AC voltage or AC current, pre- to cycle through frequency measuring and original measuring.

To measure the frequency of signal with large amplitude, it is recommended to

press measure the frequency in AC voltage measurement mode.

Measuring DC or AC Current

Warning: Never attempt an in-circuit current measurement where the open-circuit potential to earth is greater than 250 V. Doir will cause damage to the oscilloscope meter and possible electric shock or personal injury.

Caution: To avoid possible damage to the oscilloscope meter or to equipment under test, check the oscilloscope meter's fuse before measuring current. Use the proper terminals, function and range for your measurement. Never place the test le in parallel with any circuit or component when the leads plugged into the current terminals.

1. Turn off the power of the measured circuit. Discharge all high-voltage capacitors.
2. Connect the black test lead to the terminal.
3. Press A to switch DC Current measurement mode, *,DC will be displayed in the upper left covered by a then press

to switch into AC Current measurement mode, *,AC will be

displayed in the upper left corner denotesuA、mA or APress F1

F3 to select uA mA or A. When choosing uA or mA, connect the red test lead to the mA terminal; when choosing A, connect the red test lead to the A terminal.

DC Current Measurement connect test leads:

AC Current Measurement connect test leads:

1. Disconnect the circuit path to be tested. Connect the black test lead to one side of the circuit (with a lower voltage); connect the red test lead to the other side (with a higher voltage). Reversing the leads will produce a negative reading, but will not damage the oscilloscope meter.

2. Turn on the power of the measured circuit, and read the display. Press or the position with higher range. When "OL" is displayed, it indicates the input exceeds.

3. Turn off the power of the measured circuit and discharge all high-voltage capacitors. Remove the test leads and restore the circuit to the original condition.

Note: When measuring AC current, pre- to cycle through frequency measuring and original measuring.

Multimeter Features

Setting Scale

1. Press to enter automatic gear mode.

2. In the automatic gear mode, press to enter manual gear mode.

Setting Range

1. Press to switch into DC Voltage measurement, then press or to select mV or V, and then press ▲ or ▼ to up and down

measurement scales.

1. Press ≈V switch into AC Voltage measurement, then press 、F1 F2 or F4 select mV、V or Hz/V, and then press or up and down measurement scales.
2. Press to switch into DC Current measurement, then press \~ to select uA、mA or A, and then press or up and down measurement scales.
3. Press to switch into AC Current measurement, then press \~ F4 to select uA、mA、A or Hz/A, and then press ▲ or ▼ to up and down measurement scales.

Making MAX/MIN Measurements

Press MAXMIN to enter MAX/MIN measurement. When the button is pressed, it will automatically enter the manual gear mode. Press the button again to exit the MAXMIN mode and resume the automatic gear mode.

Making Comparative Measurements

In multimeter mode, press COMP to enter comparison measurement mode.(Before using this function, it is necessary to set the corresponding comparison range. For detailed instructions on setting up, please refer to page 29, "System Settings".)

• When the condition is met for being outside the range: If the current measurement value displayed on the main screen is outside the comparison range, it will be considered as a pass.
• When the condition is met for being outside the range: If the current measurement value displayed on the main screen is inside the comparison range, it will be considered as a fail.
• When the condition is met for being inside the range: If the current measurement value displayed on the main screen is inside the comparison range, it will be considered as a pass.
• When the condition is met for being inside the range: If the current measurement value displayed on the main screen is outside the comparison range, it will be considered as a fail.

Value Hole Mode

The value hold mode keeps the current reading on the display.

1. Press ,the current reading will be maintained,HOLD will be displayed.Simultaneously, the device will continue to display the actual measurement value in the status bar at the top of the main screen.

2. Press it again to exit the mode.

Making Relative Measurements

When making relative measurements, reading is the difference between a stored reference value and the input signal.

1. Press to enter the relative mode, will be shown on the display.

The measurement value when pressing is the reference value. In this mode, (current reading) = input value - reference value .

1. Press it again to exit the mode.

In relative measurement, the manual range mode will be activated automatically. (When the range is exceeded, the relative value mode cannot be turned on, that is, this function is only available under the manual range mode.)

5.How to Use the Oscilloscope

Introduction to the User Interface of the Oscilloscope

Figure 3- 3: Oscilloscope Interface

Description:

1. Time base(In the vertical direction, the per grid denotes time).
2. Amplitude(In the vertical direction,the per grid denotes voltage or current).
3. Trigger operation mode:

Auto: In this trigger mode, if the specified trigger condition is not detected, the oscilloscope will initiate a forced triggering and acquisition process to display the waveform. This triggering method is suitable for unknown signal levels or when displaying DC signals, as well as when trigger conditions occur frequently and there is no need for forced triggering. When the base time is greater than or equal to 100 milliseconds, enter the scanning mode.

Normal: In this trigger mode, the oscilloscope only performs triggering and acquisition when the specified trigger condition is detected. This triggering method is applicable to low repetition rate signals, selective capture of specific events determined by trigger settings, and ensuring a stable display by preventing automatic triggering by the

oscilloscope.

Single: In this trigger mode, the oscilloscope performs a single triggering and acquisition only when the specified trigger condition is detected, and then stops. This triggering method is suitable for situations where a single capture of a specific event is needed for subsequent analysis (enabling translation and scaling of the current displayed waveform, with subsequent waveform data not overwriting the current waveform). After a single triggering, the oscilloscope enters the "STOP" state.

1. The trigger status indicates the following information:

Trig: A trigger has been detected and post trigger information is being collected.

Ready: All pre-trigger data have been obtained and the oscilloscope is ready.

Scan: Continuously collect and display waveform data.

Stop: Stop collecting waveform data.

1. Trigger edge type.
2. It indicates that there is a USB disk connecting.
3. Automatic shutdown sign: Displays the flag when enabled. Closing will hide the identity.
4. Battery level and charge indication..
5. Trigger level horizontal position.
6. F1\~F4 operation menu.
7. Waveform display area.
8. Channel waveforms.
9. Waveform scroll bar.

Measuring System

Automatic Measurement

In oscilloscope mode, press display automatic measurement value, the screen displays six measurement types in the lower left corner: Freq、Max、Min、Vpp、Avg and Rms.

The automatic measurement of voltage parameters

The oscilloscopes provide automatic voltage measurements including Avg, Vpp, Rms, Max, Min and Vamp. Figure 3-4 below shows a pulse with some of the voltage measurement points.

Figure 3-4

Avg: <1 cycle: The whole displayed waveform is used for calculation;

1 cycle: A waveform of n cycles is used for calculation.

Vpp: Peak-to-Peak Voltage.

Rms: <1 cycle: The whole displayed waveform is used for calculation;

1 cycle: A waveform of n cycles is used for calculation.

Max:The most positive peak voltage measured over the entire waveform.

Min:The most negative peak voltage measured over the entire waveform.

Measurement:

1. Press to switch into oscilloscope mode.

2. Press to open or close automatic measurement function.The

measurement values of the waveform will be displayed in the lower left corner of the screen.

1. Press to V over voltage measurement, press or to select mV or V measurement unit, and then press or to down and down measurement gear, press or to adjust time base gear.
2. Press to enter current measurement, press \~ to select uA、mA or A measurement unit, and then press ▲ or ▼ to up and down measurement gear, press ▲ or ▶ to adjust time base gear.
3. Press ▶/11 to enter pause mode, if you press F1 or F2 can horizontally shift the waveform and press for to zoom in or out the waveform.
4. Press REL, automatically setting the trigger level to half of the current signal's Vpp.

Trigger System

The trigger determines when the oscilloscope starts to acquire data and display waveforms. Once the trigger is set correctly, it can convert an unstable display into a meaningful waveform.

When the oscilloscope starts to acquire data, it first acquires enough data to draw the waveform on the left side of the trigger point. The oscilloscope continuously acquires data while waiting for the trigger condition to occur.

When a trigger is detected, the oscilloscope continuously acquires enough

data to draw a waveform on the right of the trigger point.

The trigger mode of this series of oscilloscopes is edge trigger.

The edge trigger mode is to trigger on the trigger electrical level of the edge of the input signal, that is, trigger on the rising and falling edges of the input signal.

Press to enter edge trigger menu.

The description of the trigger system setting menu is as follows:

Function Menu	Setting	Description
Mode	Auto	Waveforms can be acquired without detecting trigger conditions.
	Normal	The waveform is acquired only when the trigger conditions are met.
	Single	When a trigger is detected, a waveform is sam and then stopped.
Edge		Trigger on the rising edge of the signal. Trigger on the falling edge of the signal.

Mode:Press can cycle through Auto 、Normal or Single.

Edge:Press cycle through rising edge and falling edge.

Trigger level position: Press 53 can 154 and down trigger level position.

6.Save and Recall Picture

1. Save picture:Press 📄n will initiate the process of capturing a screenshot. Upon completion, a prompt will appear containing information about the directory where the screenshot is saved. By default, it is possible to save up to 20 screenshots, with new captures overwriting older ones once the limit is reached.

Note: The dot next to the battery will display orange if the storage space is insufficient, and it will display green if the storage space is adequate.

1. Recall picture: Upon connecting the USB cable to a computer, to open the saved image, select the path where the image is stored.

7.System Settings

Press to enter the system function menu. Press or to F1 F2

select the desired function menu, and then press F3 to set F4 desired setting.

- Date|Time

Select Date|Time page,you can do the following. The description of the option is as follows:

Page options	Description
Date,Time	Set the required time.
Hour 12h	Set the display mode to 12-hour format.
Date Tran	Set the time display format.

1. Press the power button can display the hidden time icon; press any button, can hide the date.

1. Time setting: Select Date, Time option. Press on to select

year、month、day、hour、minute and second,and then press F3 or

F4 to set required time.

1. 12-hour format setting: Select Hour 12h option. Press the time display will be in the 12-hour format and press it again will switch to 24-hour format.

2. Date display settings: Select Date Tran option. Press AUTO the date will be displayed in the format of DD/MM/YYYY (day/month/year), and press it again, the date will be displayed in the format of YYYY/MM/DD.

- Display

Select Display page, you can do the following.

The description of the option is as follows:

Page options	Description
Dark Mode	Set the multimeter display mode
Brightness	Adjust brightness High, Mid or Low.

1. Multimeter display mode setting: Select Dark Mode option, and then

press , "Reboot device Press again" prompt box will pop up on

the screen. Pressing the button at the same time will restart the device and apply the new display mode. Press any key to undo the action currently being performed.

1. Brightness setting: Select Brightness option, and then press the brightness varies between Low, Mid, and High.

- Sound

Select Sound page, you can do the following.

The description of the option is as follows:

Page options	Description
Voice	Set the key operation prompt tone.
Volume	Set the volume.
Warning	Set alarms.

1. Voice setting: Select Voice option, and then press AUTO will produce a sound prompt; press it again will be no sound prompt upon pressing a key.

2. Volume setting: Select Volume option, press F4 will increase volume;

press F3 will decrease volume. The sound is set to maximum by

default.

1. Warning setting: Select Warning option, and then press AUTO an alarm notification will be enabled; press it again will there will be no alarm notification (Such as: probe socket detection).

- System

Select System page, you can do the following.

The description of the option is as follows:

Page options	Description
Auto Power Off	Set automatic shutdown.
Power Off	Set the automatic shutdown time.
Reset	Restore default setting.
About	Display information about the instrument.

1. Automatic shutdown setting: Select Auto Power Off option, and then press will enable automatically shut down. When enabled, the device will automatically power off after a specified period of inactivity; pressing the button again will require manual shutdown.
2. Automatic shutdown time setting: Select Power Off option. Press AUTO the shutdown time will change between 5 min and 30 min.
3. Reset setting: Select Reset option, and then press AUTO, "Reset settings Press again" will pop up on screen, press AUTO at the same time, the device will restart and restore default setting. Press any key to undo the action currently being performed..

• DMM

Select DMM page, you can do the following: The description of the option is as follows:

Page options	Description
Cont SENS	Set the on-off value(HDS120 series device can not be set).
Comp Range	Set comparison range.
Out Range Pass	Set the comparison pass condition range outside the interval.

1. Set on-off range: Select Comp Range option, and then pre- or

F4 can modify the range of the interval (left and right intervals will be automatically determined).

1. Set out range pass: Select Out Range Pass option, and then press

AUTO to enable or disable the option. Enabling this option sets the comparison pass condition as outside the interval. Disabling this option sets the comparison pass condition as inside the interval.

8. Technical Specifications

Standard conditions: The environment temperature is 18^ C to 28^ C, the relative humidity is less than 80%.

Note:

When measuring AC voltage, accuracy guarantee range is 10% to 100% of the range.

When measuring DC voltage, AC/DC current or capacitance, accuracy guarantee range is 5% to 100% of the range.

Multimeter Specification

Function		Measurement Range	Resolution/ Frequency Range	Accuracy ± (% of reading LSB)
DC Voltage (V)	mV	20.000mV	0.001mV	±(0.1%+20dig)
		200.00mV	0.01mV	±(0.1%+6dig)
	V	2.0000V	0.1mV	±(0.1%+5dig)
		20.000V	1mV
		200.00V	10mV
		1000.0V	0.1V	±(0.15%+5dig)
AC Voltage (V)	mV	20.000mV	0.001 mV	VRMS Freq range: 40Hz-1000Hz	±(0.6%+10dig)
		200.00mV	0.01mV
	V	2.0000V	0.1mV
		20.000V	1mV
		200.00V	10mV
		750.0V	0.1V		±(0.8%+10dig)
DC Current (A)	μA	200.00μA	0.01μA	±(0.6%+10dig)
		2000.0μA	0.1μA	±(0.5%+10dig)
	mA	20.000mA	1μA	±(0.6%+10dig)
		200.00mA	10μA	±(0.5%+10dig)
	A	2.0000A	100μA	±(1.0%+10dig)
		10.000A [1]	1mA	±(2.0%+10dig)
AC Current (A)	μA	200.00μA	0.01μA	VRMS Freq range: 40Hz-1000Hz	±(0.8%+10dig)
		2000.0μA	0.1μA
	mA	20.000mA	1μA
		200.00mA	10μA
	A	2.0000A	100μA		±(1.5%+10dig)
		10.000A [1]	1mA		±(2.5%+10dig)
Resistance(Ω)		200.00Ω	0.01Ω	±(0.8%+10dig)
		2.0000kΩ	0.1Ω	±(0.3%+5dig)
		20.000kΩ	1Ω	±(0.3%+5dig)
		200.00kΩ	10Ω
		2.0000MΩ	100Ω
		20.000MΩ	1kΩ	±(0.5%+5dig)
		100.00MΩ	10kΩ	±(5.0%+10dig)
Capacitance(F)		2.000nF	1pF	±(5.0%+10dig)
		20.00nF	10pF	±(3.0%+10dig)
		200.0nF	100pF
		2.000μF	1nF
		20.00μF	10nF
		200.0μF	100nF
		2.000mF	1μF
		20.00mF [2]	10μF
Frequency[3] (Hz)		200.00Hz	0.01Hz	±(0.1%+5dig)
		2.0000kHz	0.1Hz
		20.000kHz	1Hz
		200.00kHz	10Hz
		2.0000MHz	0.1kHz
		20.000MHz	1kHz
Duty Cycle[4] (%)		0.1% -99.9%(Typical: Vrms=1 V, f=100Hz)	0.1%	±(1.2%+3dig)
		0.1%-99.9%(≥ 1 kHz)		±(2.5%+10dig)
Diode		3.0000V	0.0001V	±(1.0%+10dig)
On-Off		1000.0Ω	0.1Ω
Maximum Reading		20000

[1] When measuring current, for OA the measuring duration should not be over 2 minutes within 10 minutes, and in this 10 minutes, no other current should flow through except within the measuring duration.
[2] When measuring capacitance, for the 20.00mF range, the measuring duration should be over 30 seconds.
[3] When measuring frequency, the typical waveform is Square or Sine. The

signal meets the following conditions:

Frequency	Amplitude(rms)
1 Hz – 20 MHz	≥ 1 V

[4] When measuring duty cycle, the typical waveform is Square.

Note: when measuring resistance and capacitance, the influence of the resistance reactance of the pen itself on the measured value should be considered.

Oscilloscope Specification

Characteristics	Instruction
Analog bandwidth	1MHz (only ACV scale)
Maximum sample	5.0MSa/s
Channel	1
Input impedance	approximately 10MΩ
Time base range	2.5us~10s/grid
Time base accuracy	±(0.01% + 0.1div)
Voltage vertical sensitivity range	30mV~500V/grid
Current vertical sensitivity range	100μA~5A/grid
Vertical amplitude accuracy	±(5% + 0.2div)
Maximum voltage limit	1000V DC+AC Peak value
Maximum current limit	15A DC+AC Peak value
Trigger mode	Auto/Normal/Single
Autoset	Time base/Vertical amplitude/Trigger value
Trigger edge	Rise edge/Fall edge
Measurement function	Vmax,Vmin,Vp-p,Vavg,Vrms,Hz

Note: The signal is within 5dB attenuation with an analog bandwidth of up to 1MHz.

General Specification

Characteristics	Instruction
Sleep Mode	√
Low battery indication	√
Backlight	√
Input Protection	√
Input Impedance	≥ 10 MΩ
Battery	Single 18650 3.7v
Display	2.8 inchIPS:320*240 resolution
Weight (without package)	Approx. 0.33kg(without battery)
Dimension	188mm(Length)* 93mm(Width)*41.5mm(Depth)
Working temperature	0°C to 40°C
Storage temperature	-10°C to 60°C
Relative Humidity	≤ 80%
Altitude	Operating: 3,000 metersNon-operating: 15,000 meters

Interval Period of Adjustment:

One year is recommended for the calibration interval period.

9. Appendix

Appendix A: List of Accessories

• 1 set of probes
• 1 quick guide
  ● 1 USB-TYPEC line

Appendix B: Maintenance and Cleaning

General maintenance

Do not store or place the instrument in a place where the LCD screen will be exposed to direct sunlight for a long time.

Caution: Do not let spray, liquid or solvent touch the instrument or probe to prevent damage to the instrument or probe.

Cleaning:

Check the instrument and probe frequently according to the operation. Clean the external surface of the instrument as follows:

1. Please wipe the floating dust outside the instrument and probe with a soft cloth. When cleaning the LCD, be careful not to scratch the transparent LCD protection screen.
2. Wipe the instrument with a damp but non dripping soft cloth. Please disconnect the power supply. It can be scrubbed with soft detergent or water. Do not use any abrasive chemical cleaning agent to avoid damaging the instrument or probe.

Warning: Please make sure the instrument is dry before re-energizing to avoid electrical short circuit or personal injury caused by moisture.

Charging and Replacement of Battery

During the long-term storage of the device, the battery may be too low due to the self-discharge of the lithium battery and the device cannot be turned on. This is a normal phenomenon.

To pre-charge the device for 0.5 to 1 hour (depending on the storage time) before turning it on. In addition, if the device is not used for a long time, it is recommended to charge it at regular intervals to avoid over-discharge of the lithium battery.

Battery Charging

The lithium battery may not be fully charged when delivered. The power supply and battery indicator symbols in the upper right corner of the screen are explained as follows:

Model	Charging	Discharging
120 series device	≥2.5 hour	≥24 hour

symbol indicates the power-on charging status;

symbol indicates battery power supply;

symbol indicates that there is only about five minutes of use time left.

Please charge as soon as possible according to the relevant tips to avoid damage to the battery.

Charging Method

Connect the oscilloscope meter to a computer or other equipment through a USB data cable for charging (pay attention to the load capacity of the power supply equipment to avoid abnormal operation of the equipment).

Note

To avoid overheating of the battery during charging, the ambient temperature must not exceed the allowable value given in the technical specifications.

Replacement of Lithium Battery

Generally, the battery does not need to be replaced. However, when necessary, it can only be replaced by qualified personnel, and only lithium batteries of the same specification can be used.