Tenma 72-14120 User manual

Function Generator
Model 72-14120, 72-14122 and 72-14126

1
Contents
Function Generator...........................................................................................................................................................0
Model 72-14120, 72-14122 and 72-14126.........................................................................................................................0
Contents.............................................................................................................................................................................1
1.1 Safety Terms and Symbols..............................................................................................................................3
1.2 General Safety Overview ..................................................................................................................................4
Chapter 2............................................................................................................................................................................5
Brief Introduction of Tenma Series Function/Arbitrary Waveform Generator .............................................................5
2.1 Main Characteristics........................................................................................................................................5
2.2 Introduction of Panels and Keys.....................................................................................................................6
2.2.1 Front Panel........................................................................................................................................6
2.2.2 Back Panel.........................................................................................................................................9
2.2.3 Function Interface............................................................................................................................10
Chapter 3 Quick Start......................................................................................................................................................12
3.1 Output Basic Waveform.....................................................................................................................................12
3.1.1 Set Output Frequency......................................................................................................................12
3.1.2 Set OutputAmplitude.......................................................................................................................14
3.1.3 Set DC Offset Voltage......................................................................................................................15
3.1.4 Set Square Wave.............................................................................................................................16
3.1.5 Set Pulse Wave ...............................................................................................................................17
3.1.6 Set DC Voltage ................................................................................................................................18
3.1.7 Set Sawtooth Wave .........................................................................................................................19
3.1.8 Set Noise Wave...............................................................................................................................20
3.2 SYNC Output ......................................................................................................................................................21
3.3 Frequency Measurement...................................................................................................................................22
3.4 Use Built-in Help System...................................................................................................................................22
Chapter 4 Advanced Applications .................................................................................................................................23
4.1 Output Modulation Waveform...........................................................................................................................23
4.1.1 Amplitude Modulation (AM)..............................................................................................................23
4.1.2 Frequency Modulation（FM）.........................................................................................................31
4.1.3 Phase Modulation（PM）................................................................................................................38
4.1.4 Amplitude Shift Keying（ASK）.......................................................................................................45
4.1.5 Frequency Shift Keying（FSK）......................................................................................................51
4.1.6 Phase Shift Keying (PSK)................................................................................................................57
4.1.7 Binary Phase Shift Keying（BPSK）...............................................................................................62
4.1.8 Quadrature Phase Shift Keying（QPSK）......................................................................................68
4.1.9 Oscillation Keying（OSK）..............................................................................................................73
4.1.10 Quadrature Amplitude Modulation（QAM）....................................................................................78
4.1.11 Sum Modulation（SUM）................................................................................................................83
4.1.12 Pulse Width Modulation（PWM）...................................................................................................89
4.2 Output Frequency Sweep Waveform................................................................................................................96
4.2.1 Select Frequency Sweep.................................................................................................................96
4.2.2 Set Starting and Stop Frequency.....................................................................................................97
4.2.3 Frequency Sweep Mode..................................................................................................................98
4.2.4 Frequency Sweep Time...................................................................................................................99

2
4.2.5 Select Trigger Source ....................................................................................................................100
4.2.6 Trigger Output................................................................................................................................101
4.2.7 Trigger Edge..................................................................................................................................101
4.2.8 Comprehensive Example...............................................................................................................102
4.3 Output Burst.....................................................................................................................................................105
4.3.1 Select Burst ...................................................................................................................................105
4.3.2 Type of Burst..................................................................................................................................107
4.3.3 Phase of Burst...............................................................................................................................109
4.3.4 Period of Burst...............................................................................................................................109
4.3.5 Counting of Burst...........................................................................................................................109
4.3.6 Select Trigger Source .................................................................................................................... 110
4.3.7 Trigger Output................................................................................................................................ 110
4.3.8 Trigger Edge.................................................................................................................................. 110
4.3.9 Comprehensive Example............................................................................................................... 110
4.4 Output Arbitrary Wave..................................................................................................................................... 114
4.4.1 Use Arbitrary Wave Function ......................................................................................................... 114
4.4.2 Point-by-point Output/Play Mode................................................................................................... 115
4.4.3 Select Arbitrary Wave..................................................................................................................... 116
4.4.4 Create and Edit Arbitrary Waveform ..............................................................................................120
4.5 Output Digital Protocol Coding.......................................................................................................................120
4.5.1 Description of Interface Front Panel...............................................................................................121
4.5.2 UART Protocol...............................................................................................................................122
4.5.3 I2C Protocol...................................................................................................................................130
4.5.4 SPI Protocol...................................................................................................................................137
4.6 Function of Digital Arbitrary Wave..................................................................................................................142
Chapter 5 Fault Handling..............................................................................................................................................147
5.1 No Display on Screen (Blank Screen)............................................................................................................147
5.2 No Waveform Output .......................................................................................................................................147
5.3 Fails to Correctly Recognize U Disk...............................................................................................................147
Chapter 6 Service and Support....................................................................................................................................148
6.1 Program Upgrade of Product..........................................................................................................................148
Appendix A: Factory Reset State.................................................................................................................................149
Appendix B: Performance Index..................................................................................................................................154
Appendix C: List of Accessories .................................................................................................................................160
Appendix D: Maintenance and Cleaning.....................................................................................................................161

3
Chapter 1 Safety Information
1.1 Safety Terms and Symbols
Terms in the manual
The following terms may appear in the manual:
Warning: warning statement, pointing out conditions and behaviors that may endanger life safety.
Caution: cautionary statement, pointing out conditions and behaviors that may cause damage to the product and
other properties.
Terms on the product
The following terms may appear on the product:
Danger: indicate that you may be immediately harmed when reading this sign.
Warning: indicate that you may not be immediately harmed when reading this sign.
Caution: indicate that the product or other properties may be damaged.
Symbols on the product
The following symbols may appear on the product:
AC
Measuring ground terminal
Frame ground terminal
ON/OFF
Danger! High voltage
Caution: please refer to the manual
Protective ground terminal

4
1.2 General Safety Overview
•This instrument is designed and manufactured in compliance with: G84793, lEC61010-1, CAT III 600V, Pollution
Degree 2 and Double Insulation standards.
•When using electrical appliances basic safety precautions should always be followed.
•Check that the voltage indicated on the rating plate corresponds with that of the local network before connecting
the appliance to the mains power supply.
•Please operate according to this manual, otherwise the protection provided by the device will be impaired or fail.
•This product must be grounded.
•This product is grounded through the earth wire in the mains lead. In order to prevent electric shock, please
check whether the power socket to be used for the product is grounded. Please ensure that the protective ground
terminal of the product is reliably connected to the ground terminal of power line before connecting any input or
output terminal.
•This appliance is not intended for use by persons (including children) with reduced physical, sensory or mental
capabilities or lack of experience or knowledge. They should be given supervision and instruction in the use of
the appliance by a person responsible for their safety.
•Children should be supervised to ensure that they do not play with the appliance.
•There are no user-serviceable parts in this product. Refer servicing to qualified personnel.
•In order to prevent fire or electric shock, please pay attention to all rated values and modes of the product.
Please read user’s manual before connection of the product to further understand information about rated
values.
•Check the test leads, cables and case insulation before using. If you find any breakage or abnormality, or you
consider the device is broken, stop using the device immediately.
•Do not use the product for any purpose other than that for which it is designed.
•Don’t insert metal objects into input or output terminal of the product.
•If you suspect that the product is damaged, please ask qualified maintenance personnel to inspect.
•Never operate the product with the cover removed.
•Do not operate or store in an environment of high humidity or where moisture may enter the product.
•Do not use the meter around explosive gas or vapour.
•Disconnect from the supply when not in use.

5
Chapter 2
Brief Introduction of Tenma Series
Function/Arbitrary Waveform Generator
Function/arbitrary waveform generator of the series uses direct digital synthesis to generate accurate and stable
waveform output with resolution as low as 1μHz as an economic, high-performance and multi-functional dual-channel
function/ arbitrary waveform generator. It can generate accurate, stable, pure and low-distortion output signal, and provide
high-frequency square wave with fast rising and falling edges. Convenient operation interface, excellent technical
indicator and humanized graphic display can help you finish work tasks faster and improve work efficiency. It is
multi-purpose equipment that meets your present and future test requirements.
2.1 Main Characteristics
•Sine wave output of 160MHz/120MHz/80MHz, full-band resolution of 1μHz.
•Pulse waveform of 50MHz（or 40MHz, adjustable time of rising, falling and duty ratio.
•Sampling rate of 500MSa/s and vertical resolution of 16bit.
•6-bit high-precision frequency meter compatible with TTL level signal.
•Dual channel of standard configuration and other performance, and independent output mode of channel .
•Arbitrary wave storage of 8～32M points, 7GB non-volatile waveform storage.
•Rich modulation types：AM, FM, PM, ASK, FSK, PSK, PWM, QAM, BPSK, QPSK, OSK, SUM.
•16bit digital arbitrary wave (TTL level) DARB.
•Protocol output: I2C, SPI, RS232 (TTL level).
•Powerful upper computer software.
•8-cun high-resolution TFT colour LCD.
•Standard configuration interface: USB Host (max.32G), USB Device, LAN, 10MHz clock source input, 10MHz
clock source output.
•Dual channel can respectively or simultaneously: internal/external modulation, internal/external/manual trigger.
•Support frequency sweep and pulse train output.
•Easy-to-use multi-functional control and numeric keypad.

6
2.2 Introduction of Panels and Keys
2.2.1Front Panel
Function/arbitrary waveform generator provides users with simple and intuitive front panel that is easy to operate, which is
shown in Figure 2-1:
Figure 2-1 Structure of front panel
1
．
ON/OFF
Supply voltage of power source is AC 100V~240V. Frequency is 45Hz~440Hz. Connect the instrument to the power
source with power line in accessories or other power lines up to standard. Turn on power switch below the supply hub to
power on the instrument. The on/off switch backlight lights red after powering on at the rear switch on back panel.
Press the on/off switch, the backlight is turns green. The display screen enters function interface after displaying the
start-up interface. In order to prevent accidentally touching ON/OFF to turn off the instrument, the switch requires to be
held for about 1s to turn off the instrument. The backlight of the key and screen are simultaneously off after turning off the
instrument.
2
．
USB interface
This instrument supports U disks of FAT 16 and FAT32 with maximum capacity of 32G. USB interface can be used to
read any waveform data files in U disk, store or read current files of the instrument. The system program can be upgraded
through the USB interface to ensure that the current program of function/arbitrary waveform generator is the latest version
released by the company.
1.ON/
OFF
2.
USB
interface
3.
Digital
protocol
interface
4.
CH1 output
terminal/sync output
terminal
5.
CH1
control end
6.
Sync setting
key
7.
CH2
control end
8.
CH2 output
terminal/sync output
terminal
9
Manual trigger key
10.
System function key
11.
Numeric keyboard
12.
Direction key
13.
Multi-functional
control/key
14.
User’s key/digital
interface/frequency
meter/modulation/sweep
frequency/pulse train
15.
Quick selection
of waveform type
17.
Soft function
key menu
18.
Display
screen
16.
Page Up/Down

7
3. Protocol interface
Interface supporting RS232, I2C and SPI protocols and any 16bit digital arbitrary wave is capable of corresponding
communication protocol output, and used with DIGITAL menu.
4
．
CH1 output terminal/ sync output terminal
Waveform signal and synchronous signal output of channel 1. Switching of output signal is controlled by CH1 or submenu
under UTILITY.
5
．
CH1 control terminal
Fast switch the current channel on the screen (illumination of CH1 indicator shows it is the current channel) and the
parameter list shows information about channel 1 set waveform parameters. Press CH1 to turn the output of channel 1
on/off. Backlight of CH1 is lit and the current function mode will be displayed on the right of CH1 indicator (“BASE” or
“MOD” or “SWEEP” or “BURST”), while “ON” is highlighted and CH1 terminal outputs the signal. Backlight of CH1 is lit
and “OFF” is highlighted on the right of CH1 information tag the CH1 output terminal is turned off.
6
．
Sync setting key
Quickly set the relationship between CH1 and CH2 configuration. Press this key to make the output signal of CH1 the
same as that of CH2, or the output signal of CH2 the same as that of CH1, or exchange the output signal of the two
channels. The selection of specific mode is controlled by submenu CH Copy under UTILITY. In the submenu of CH Copy
menu, 0:1->2 is to copy CH1 settings to CH2, 1:2->1 is to copy CH2 settings to CH1, and 2:1<->2 is to exchange settings
of CH1 and CH2.
7
．
CH2 control terminal
Fast switch the current channel on the screen (illumination of CH2 indicator shows it is the current channel) and the
parameter list shows information about channel 1 set waveform parameters. Press CH2 to turn the output of channel 2
on/off. Backlight of CH2 is lit and the current function mode will be displayed on the right of CH2 indicator (“BASE” or
“MOD” or “SWEEP” or “BURST”), while “ON” is highlighted and CH2 terminal outputs the signal. Backlight of CH2 is lit
and “OFF” is highlighted on the right of CH2 information tag the CH2 output terminal is turned off.
8
．
CH2 output terminal/ sync output terminal
Waveform signal and synchronous signal of output channel 2. Switching the output signal on/off is controlled by CH2 or
submenu under UTILITY.
9
．
Manual trigger key
Set trigger and execute manual trigger when flashing.
10
．
System function key
Used for system setting, including function menus PRESET, STORAGE, UTILITY and HELP corresponding to factory
default settings, waveform storage, general function and help menu respectively.
11
．
Numeric keyboard
Numeric keys 0-9 used for inputting required parameters, decimal point “.”, symbolic key “+/-”. Decimal point “.” can be
used to quickly switch units. Left direction key backspaces to clear the last digit input.

8
12
．
Direction key
Switch numerical digits or move (left or right) cursor when setting parameters with multi-functional control and direction
key. The left key can be used to clear the last digit input when inputting using the data keys.
13
．
Multi-functional control/key
Rotate the multi-functional control to change the number (increase the number by clockwise rotation) or select menu key.
Press the multi-functional control to select function and confirm the parameters set.
14
．
Menu key functions
Control corresponding functions using keys: USER – user settings, DIGITAL - digital interface, COUNTER - frequency
meter, MOD - modulation mode, SWEEP - sweep frequency and BURST - pulse train output.
15
．
Quick selection of waveform type
Quickly select waveform type required by keys to quickly generate common waveforms you need.
16
．
Page Up/Down
There are F1-F6 ‘soft key’ function menus on the right of the screen. When soft keys of some functions are too numerous
to be displayed on one page, they will be arranged on more than one page. Press this key to switch between multiple
pages.
17
．
Soft function key menu
Accordingly select or check tags (on the right of function interface) through identification of soft keys, and set parameters
with numeric keyboard, multi-functional control or direction key.
18
．
Display screen
8 inch high-resolution TFT colour LCD clearly displays the output state, function menu and other important information of
channel 1 and 2 through different colours. CH1 and all corresponding function borders display in red and all CH2 and
corresponding functions display in blue. When a border is illuminated the settings within can be adjusted using direct
numeric keys, multi-function rotary control and the direction keys. When a parameter is input as required pressing the
multi-function control locks the setting and allows selection of further parameter selection, either by direct function keys or
by rotating the multi-function control.

9
2.2.2 Back Panel
Back panel is shown in Figure 2-2:
Figure 2-2 Structure of back panel
1
．
Heat dissipation grille
In order to ensure good heat dissipation of the instrument, please don’t block this grille.
2
．
Internal 10MHz output terminal
Establish synchronous or external clock signal with reference frequency of 10 MHz for multiple function/arbitrary
waveform generators.When clock source of the instrument is internal, the output terminal outputs an internal 10MHz clock
signal.
3
．
External 10MHz input terminal
Establish synchronization of multiple function/arbitrary waveform generators or synchronization with an external 10MHz
clock signal. When clock source of the instrument is external, the input terminal receives an external 10MHz clock signal.
4
．
Frequency meter interface
Input signal through this interface when using frequency meter (compatible with TTL level).
5
．
External digital modulation interface
If modulation of ASK, FSK, PSK or OSK signal source is external, input modulation signal is received through the external
digital modulation interface (TTL level). The corresponding output amplitude, frequency and phase are determined by
signal level of external digital modulation interface. If the trigger source of frequency sweep or pulse train is external, the
digital modulation interface will receive a TTL pulse with designated polarity. This pulse can start scanning or output pulse
train with designated recurring number. Input gated signal through the external digital modulation interface if pulse train is
gated; and output trigger signal for frequency sweep or pulse train (if trigger source is external, trigger output will be
hidden in the parameter list as external digital modulation interface cannot be simultaneously used for input and output).
6.
External analog
modulation input
terminal
5.
External digital
modulation
interface
3.
External 10M
Hz input
terminal
4.
Frequency meter
interface
7.
USB
interface
8.
LAN port
1.
Heat emission
grille
2.
Internal
10MHz output
terminal
11.
Crate lock
10.
AC power input
socket
9.
Mains power
on/off switch

10
6
．
External analog modulation input terminal
In modulation of AM, FM, PM, SUM or PWM signal is external, input modulation signal is received through external analog
modulation input terminal. The corresponding modulation depth, frequency deviation, phase deviation or duty ratio
deviation is controlled by ±5V signal level of the external analog modulation input terminal.
7
．
USB interface
Connect to the external computer software through this USB interface to initialise control of the instrument by computer.
8
．
LAN port
LAN port can be used to connect the instrument to a network.
9
．
Main power switch
Main power switch to energize the instrument. If turned OFF the front on/off button is inoperable.
10. AC power input socket
AC power specification supported by this function/arbitrary waveform generator is: 100~240V, 45~440Hz.
11. Crate lock
Open the crate lock to arrange anti-theft measures for the instrument.
2.2.3Function Interface
Function interface is shown in Figure 2-3:
Figure 2- 3 Function interface
CH1 information
CH2 information
Waveform
parameter
list
Waveform
display
area
Soft key
label

11
Detailed description:
CH1 information: highlighted display (red illumination) means that this part of display screen displays information
about channel 1. Parameters of this channel can be set. Parameters of this channel cannot be set if not highlighted.
Press CH1 to enable. Output (highlighted “ON” means that channel output is turned on, and highlighted “OFF” means
that channel output is turned off), output impedance (“HighZ” means high-impedance output, “50Ω” means 50Ω output)
and effective waveform (“BASE” is basic waveform, “MOD” is modulation mode, “SWEEP” is frequency sweep mode,
and “BURST” is pulse train) will be displayed on the right of the tag.
CH2 information: highlighted display (blue illumination) means that this part of display screen displays information
about channel 2. Parameters of this channel can be set. Parameters of this channel cannot be set if not highlighted.
Press CH2 to enable. Output (highlighted “ON” means that channel output is turned on, and highlighted “OFF” means
that channel output is turned off), output impedance (“HighZ” means high-impedance output, “50Ω” means 50Ω output)
and effective waveform (“BASE” is basic waveform, “MOD” is modulation mode, “SWEEP” is frequency sweep mode,
and “BURST” is pulse train) will be displayed on the right of the tag.
Soft key display:identify functions of soft keys menu and operation soft keys. Highlighted display: highlighted display
means that colour of the channel is displayed in the middle of the display, and typeface is pure white. Tag on the right
of screen: the uppermost character is name of submenu, and number under the name is number of pages of submenu
and the current page. For example, “1/2” means page 1 of 2 of submenu. Use Page Up/Down at the top right corner of
the display area for page turning.
Waveform parameter list: display parameters of the waveform in the form of a list. If items in the list are highlighted,
parameters can be set through menu operation soft keys, numeric keyboard, direction key and multi-functional control.
If background of the character is dark blue, the character is being edited. Parameters can be set with direction key,
numeric keyboard or multi-functional control.
Waveform display area: display the current waveform of the channel.
Note: there is no waveform display area in system setting. This area is expanded into parameter list.

12
Chapter 3 Quick Start
3.1 Output Basic Waveform
3.1.1 Set Output Frequency
The default configuration of waveform is a sine wave with frequency of 1kHz and peak-to-peak amplitude of 100mV
(terminating at 50Ω) when powering on.
For example the specific steps for changing frequency into 2.5MHz are as follows:
1. Press function key F1 and the required soft key border outline illuminates to match the colour of the corresponding
channel, and “Freq” character is highlighted and editable, “Period” tag is greyed out. Pressing function key F1 again
changes to the set waveform period, when “Freq” character is greyed out and “Period” character is highlighted and now
the waveform period can be edited.
Figure 3- 1 Setting of selected frequency

13
2. Input the required number 2.5 with numeric keyboard. The left direction key can be used to backspace when inputting.
Figure 3- 2 Set frequency
3. Select required unit.
Press soft key of corresponding unit. The waveform generator outputs waveform with the displayed frequency when you
select unit and output is switched on. In this example, press soft key corresponding to MHz.
4. Use multi-functional control and direction key for parameter setting.
In default state, use the multi-functional control to switch between options of the function menu. When option is chosen,
press the multi-functional control to select the parameter which is highlighted in red or blue depending on the channel.
Rotate the multi-functional control to adjust the setting. Press left or right direction key to select different characters. Press
the multi-functional control again after setting to exit.

14
3.1.2 Set Output Amplitude
The default configuration of waveform is a sine wave with peak-to-peak amplitude of 100mV (terminating at 50Ω) when
powering on. The specific steps for changing amplitude into 300mV pp are as follows:
1. Press function key F2 until the required soft key border outline illuminates to match the colour of the corresponding
channel and character “Amp” is highlighted white and editable and “High” is greyed out. Pressing function key F2 again
switches between the unit options (Vpp, Vrms and dBm).
2. Input required amplitude value 300 with numeric keyboard.
Figure 3- 3 Set amplitude
3. Select required unit.
Press soft key of corresponding unit. The waveform generator outputs waveform with the displayed amplitude when you
select unit and switch output on. Press mVpp used in this example.
Note: this parameter can also be set with multi-functional control and direction key.

15
3.1.3 Set DC Offset Voltage
The default configuration of waveform is a sine wave with DC offset voltage of 0V (terminating at 50Ω) when powering on.
The specific steps for changing DC offset voltage into -150mV are as follows:
1. Press function key F3 until the required soft key border outline illuminates to match the colour of the corresponding
channel. When pressing function key F3 again, you will find that the waveform of parameter described with amplitude and
DC offset has been described with high level (maximum value) and low level (minimum value). Such method for setting
signal limit is very convenient for digital application.
2. Input required DC offset value -150mV with numeric keyboard.
Figure 3- 4 Set offset voltage
3. Select required unit
Press soft key of corresponding unit. The waveform generator outputs waveform with the displayed DC offset when you
select unit and switch output on. Press mV in this example.
Note: this parameter can also be set with multi-functional control and direction key.

16
3.1.4 Set Square Wave
The duty ratio of square wave represents time quantum of square wave at high level in each cycle (suppose waveform is
not reversed). The default duty ratio of square wave is 50% when powering on. The duty ratio is restricted by minimum
pulse width specification 10ns. The specific steps for setting square wave with frequency of 1kHz, amplitude of
1.5Vpp, DC offset of 0V and duty ratio of 70% are as follows:
Press Square, Freq, Amp and Duty to set corresponding functions. Press the corresponding soft key to edit parameters,
then input the required value, and finally select the unit. Select corresponding value to set the duty ratio.
Figure 3- 5 Set duty ratio
Note: this parameter can also be set with multi-functional control and direction key.

17
3.1.5 Set Pulse Wave
The duty ratio of pulse wave represents time quantum from the 50% threshold value of rising edge of the pulse to 50%
threshold value of the next falling edge in each cycle (if waveform is not reversed). You can input parameter configuration
for the function/arbitrary waveform generator to output pulse waveform with variable pulse width and edge time. The
default duty ratio of pulse wave is 50% when powering on. Rising/falling edge time of 72-14126 is 5ns (72-14122 is 6ns/
72-14120 is 7ns).
The specific steps for setting pulse wave with period of 2ms, amplitude of 1.5Vpp, DC offset of 0V, duty ratio
(restricted by minimum pulse width specification 10ns) of 25%, rising edge time of 200µs and falling edge time of
200µs are as follows:
Press Pulse, Freq, Amp, Duty, Rise and Fall (if tag is not highlighted, press corresponding soft function key to select),
and press soft key Freq twice to switch between frequency and period. Input the required value, and then select the unit.
When inputting value of duty ratio, input 25 and press % to finish input. To set falling edge time, please press soft key
Page Up/Down or rotate multi-functional control clockwise when sub-tag is selected to display the next screen of sub-tags
(The sub-tag is editable when the border colour matches the border colour of the channel selected, and the digits are
white on blue), press soft key Fall to input the required value and select the unit.
Figure 3- 6 Set falling edge time
Note: this parameter can also be set with multi-functional control and direction key.

18
3.1.6 Set DC Voltage
Output of DC voltage is setting of the above-mentioned DC offset. The default DC voltage is initially 0V when powering on.
The specific steps for changing DC offset voltage into 3V are as follows:
1. Press DC followed by Offset to enter the setting.
2. Input the required number 3 with numeric keyboard.
Figure 3- 7 Set DC voltage
3. Select required unit.
Press soft key of corresponding unit. The waveform generator outputs waveform with the displayed DC offset when you
select the unit and switch output on. Press V (Volts) in this example.
Note: this parameter can also be set with multi-functional control and direction key.

19
3.1.7 Set Sawtooth Wave
Degree of symmetry is time quantum when slope of sawtooth wave is positive in each cycle (if waveform is not reversed).
The default degree of symmetry of sawtooth wave is 0.10% when powering on. The specific steps for setting triangular
wave with frequency of 10kHz, amplitude of 2V, DC offset of 0V and degree of symmetry of 50% are as follows:
Press Ramp, Freq, Amp, Offset and Symmetry in sequence. Press the corresponding soft key to set the parameter, input
the required value and then select the unit. There will be tag 50% on the right of the screen when inputting the degree of
symmetry. Press the corresponding soft key to input the value. Enter 50 using the numeric keypad and then press % to
finish selection.
Figure 3- 8 Set degree of symmetry
Note: this parameter can also be set with multi-functional control and direction key.