Tenma 72-3555 User manual
1
USB Dual Channel Waveform
Generator
Model: 72-3555
2
CONTENTS
Page Number Details
3 What’s Included
3 Important Safety Information
3 Introduction
4 Key Features
4 Product Overview
6 Rear Panel
7 AC Power Receptacle
9 Start
10 Setting DC Offset Voltage
10 Setting the Square Wave
11 Setting the Pulse Waveform
11 Setting DC Volts
12 Setting the Ramp Waveform
12 Setting the Noise Waveform
12 Frequency Measurement
12 Using the Built-in Help System
13 Advanced Applications - Outputting Modulated Waveforms
15 Setting Modulation Shape Frequency
17 Frequency Modulation (FM)
19 Setting Modulation Shape Frequency
21 Phase Modulation (PM)
23 Setting Phase Deviation
25 Amplitude-Shift Keying (ASK) Modulation
28 Frequency-Shift Keying (FSK) Modulation
32 Phase-Shift Keying (PSK) Modulation
35 Pulse Width Modulation (PWM)
39 Outputting Frequency Sweep Waveforms
43 Outputting Impulse Train
49 Outputting Arbitrary Waveforms
51 Troubleshooting
52 Updating the Generator
52 Default Settings
54 Technical Specication
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WHAT’S INCLUDED
• One Dual Channel Waveform Generator
• One power cable
• One software disc
• One user manual
• One USB cable
• Two BNC cables
IMPORTANT SAFETY INFORMATION
• When using electrical appliances basic safety precautions should always be
followed.
•Use only the power cable and adaptor specied for the Generator.
• Make sure the protective ground terminal is properly grounded before making
connections to its input or output terminals.
•There are no user-serviceable parts in this product. Refer servicing to qualied
personnel.
•To avoid re or electric shock, note all the rated values and marking on the product
and read the manual for details before making any connection to the product.
• Do not apply working voltage higher than the rated value of the product.
• Check the Generator and cable prior to each use for damage. If any damage is
found do not use.
• Do not plug any metal object into the input or output terminals of the product.
•If you deem the product to not be functioning correctly have it checked by qualied
maintenance staff.
• Do not operate the product without covers open.
• Do not store or operate the product in a damp or humid environment.
•Do not store or operate the product in a ammable or explosive environment.
• Keep the product surface clean and dry at all times.
•Do not use any chemicals, abrasives or solvents that could damage the Generator.
Please read these instructions carefully before use and retain for future
reference.
INTRODUCTION
• The 72-3555 USB Dual Channel Waveform Generator adopts a DDS technique
into its design and is capable of generating accurate and stable waveforms with
the resolution as low as 1µHz.
• It is a Dual Channel Function/Arbitrary Waveform Generator with multiple
functions.
•The output signal is accurate, stable and pure with minimum distortion.
• The square wave offered is high in frequency and has very fast rising and falling
edges.
54 Waveform Characteristics
55 Modulation Types
57 General Specication
58 Cleaning & Maintenance
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KEY FEATURES
• 60MHz (or 25MHz) sine wave ouput with 1µHz resolution for full frequency range.
• 25MHz (or 5MHz) impulse waveform with adjustable time rise and fall and duty
cycle.
• 250MSa/s (or 125MSa/s) sample rate and 14-bit vertical resolution.
• 6-digit high precision frequency meter compatible with TTL level signal.
• Standard dual channels with independent channel output mode.
• 1M (or 8k) arbitrary waveform memory and 48 non-volatile waveforms storage.
•Multiple modulation types: AM, FM, PM, ASK, FSK, PSK, PWM.
• Software available for use in PC.
• 4.3” high-resolution TFT colour display.
•Standard interfaces: USB Host, USB Device, optional LAN.
•Dual channels can be applied simultaneously or independently: internal/external
modulation, internal/external/manual trigger.
• Support frequency sweep and burst output.
• Ease-of-use multipurpose knob and numeric keypad.
PRODUCT OVERVIEW
1. USB Port
•The Generator supports USB ash drive in FAT16 and FAT32 format. Through this
USB port, the Generator can read any saved waveforms from USB ash drive or
store current data into the ash drive.
2. On/Off Button
•To power on/off the Generator, press the button; the backlight will illuminate
orange and the Generator will access the power-on interface and then the
functional display.
3. Display Screen
•The Generator features a 4.3” TFT colour display with high-resolution, which
distinguishes output status, menus and other important information between CH1
and CH2 using different colours.
12.Arrow
Buttons
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4. Menu Operation Softkeys
• These buttons are used to control the parameters of the currently active function.
5. Menu Button
•Press it and four functional labels appear: Wave, Mod, Sweep and Burst. To select
one of these functions press the functional menu softkey.
6. Functional Menu Softkeys
• Select or check the labels of softkeys (on the right of the display screen) via the
corresponding identification on the labels.
7. Utility Button
•Press the button for four functional labels: CH1 setting, CH2 setting, I/O (or freq
meter) and system and the highlighted label (central background in grey and
characters in pure white) all of which have their sub-labels on the bottom of the
display screen.
• These sub-labels can help you with what the highlighted label is related to.
• Press softkeys that correspond to sub-labels to enter specific setups or
information, to set up channels (e.g. set the output impedance within 1Ω-10kΩ
or to high impedance), to specify voltage limit, configure sync output, language,
power-on parameters, backlight, configuration of DHCP (dynamic host
configuration protocol) port, storage or recall, system information setting, help topic
lists etc.
8. Numeric Keypad
•Numeric keys from 0 to 9, decimal point “.” and symbol key “+/-”.
• The decimal point can be used to switch between units.
9. Manual Trigger Button
• Manual trigger is enabled when the backlight button flashes.
10. Sync Output Connector
•Synchronises signals to output all standard output functions (except DC and
noise).
11. Multi-purpose Knob/Button
•To modify a number or be used as directional buttons. Press the multi-purpose
knob to select functions or confirm the parameter that has been set.
12. Direction Buttons
• Switch between the numeric units or clear the digit prior to the current input or
move the cursor to the right or left, when using the multifunction knob and direction
key to set up parameters.
13 & 14. CH1/CH2 Buttons
• Use these buttons to quickly switch the current channel displayed on the screen.
•For example, if CH1 is highlighted, then channel 1 is the current chosen channel
and all displayed parameters are CH1 related.
• If the current channel is CH1 then you can press the CH1 button to turn on or off
the CH1 output quickly, or you can press UTILITY to enable the CH1 setting label
and then use the CH1 Setting softkey to adjust the settings.
•Under this status, the CH1 button backlight is illuminated and synchronously the
current output function mode shows up to the right of the CH1 label (“wave”, or
“Mod”, or “Sweep”, or “Impulse Train” icon) and CH1 connector output is enabled.
•With CH1 button switched off the button backlight turns off, the “Off” icon shows to
the right of the CH1 label and the CH1 connector is disabled.
• The above bullet points apply to CH2 also.
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REAR PANEL
1. External Analogue Modulation Input Connector
•For AM, FM, PM or PWM modulation type, the terminal is used for the signal input
when external modulation source is selected.
•The corresponding modulation depth or deviation value (frequency, phase or duty
cycle) will be controlled by ±5V signal level present on this input terminal.
2. External Digital Modulation or Counter Connector
•For ASK, FSK or PSK modulation type, this connector is used for signal input
when the external source modulation is selected.
•Output amplitude, frequency and phase will be controlled by signal levels present
on this connector.
•For Sweep or Impulse Train mode, when you select external source as the trigger,
it is used to accept polarised TTL pulse that can enable the sweep or impulse train
with the specied cycle.
•If the impulse train is gated, you can input a gated signal via this connector.
• When using the frequency meter function you can also use the connector to
input signal (compatible with TTL level signal) or output trigger signal when under
Sweep or Impulse Train mode.
•When an external trigger source is selected, the Trigger Out option on the
parameter list will be ensconced, since this connector cannot be used for input and
output terminals at the same time.
3. LAN Connector
• Connect the Generator to the the local network for the remote control.
4. USB Connector
• Connect the Generator to a PC using the USB cable.
5. External 10MHz Input Connector
•Use this connector to input external 10MHz reference signal after the Generator’s
clock source is set up externally.
•To synchronize multiple 72-3555 generators or output 10MHz reference frequency
signal, use this external output connector.
6. Internal 10MHz Output Connector
• To output 10MHz reference signal after the Generator’s clock source is set up
internally.
10. AC Power
Receptacle
9.Master Power
Switch
4.USB Connector
1.External Analog
Modulation Input
2.
External Digital
Modulation or
Counter Connector
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• When you want to synchronise multiple 72-3555 generators or output 10MHz
reference frequency signal, use this internal output connector.
7. Air Vent
•To ensure the Generator does not overheat, keep this vent uncovered.
8. Fuse
•To prevent damage to the Generator, the fuse will blow and disconnect the power
supply if the input AC current exceeds 2A.
9. Master Power Switch
•To energize the Generator when set to “I”, otherwise set to “O” to disconnect AC
input (On/Off button on the front panel will not work).
AC POWER RECEPTACLE
AC power specication for the Generator: 100 to 240V, 45 to 440Hz, power fuse: 250V,
T2 A.
Display Interface
CH1 and CH2 information
•When the display is highlighted (red for CH1 and blue for CH2), it indicates which
channel information is enabled and which channel parameters can be set up.
• Only the highlighted channel can have its parameters changed.
•For the respective channels’ display there is a “Limit” icon that represents
the output amplitude limit. The limit will either be white or grey, for on and off
respectively.
• The impedance value of the output terminal needs to match (adjustable within
1Ω~10kΩ, or set to high impedance, 50Ω by default).
• On the right of the display it shows the current effective waveform (waveform
shape, or “Mod”, “Sweep” or “Impulse Train” icon) or “Off” in grey for when the CH
output connector is switched off.
Softkey Labels
• These labels identify the current functions of the functional menus softkeys and
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menu operation softkeys on the right and bottom of the display.
• The centre of the active label will be in the colour corresponding to that of the
current channel, or grey in system setting and the characters are white.
Labels on the right of the screen
• The labels will be highlighted when selected.
•The six softkey labels at the bottom of the screen will display options related to the
label on the right.
•Note: if the currently selected label has more than one sub-catalogue, the
displayed options on the bottom screen are not necessarily the sub-catalogues of
the label. For instance, if types of key label are highlighted, the sub-labels for types
of waveforms will be at the bottom of the screen, which are the sub-catalogue of
types of key label.
• If you press the Menu button, the wave label will be highlighted on the right,
however the labels at the bottom of the screen remain unchanged, though are not
sub-catalogues of Wave.
•When the label on the right includes more than six options, press the label again to
access the next screen to view more options.
Sub-labels at the bottom of the screen
•When sub-label options are from the Type menu, these labels will be highlighted
when active.
•When the sub-labels are from the Params menu or the Utility menu, the sub-label
options correspond with parameters and are also highlighted around the edges
with the same colour as that of the current channel, or grey when in the Utility
menu.
•Once a sub-label has been selected, rotating the multipurpose knob or pressing
the left and right buttons will cycle through the parameter that correspond to the
sub-label.
•Use the multipurpose knob if you want to modify the parameter, press the
multipurpose knob to begin editing the setting. Press the knob again when editing
is over.
•If “sub-label” has been selected instead of “editing” status, turning the
multipurpose knob or pressing the directional buttons along with the label,
enables the switch between different labels (switch between different parameters
accordingly in the parameter list).
•To modify parameters, you can enter the numbers directly using the numeric
keypad, with the left arrow button as a delete function in this mode.
• Select the desired unit using the softkeys options at the bottom of the screen to
confirm and exit editing.
Waveform Parameter List
• All parameters related to the current waveform will be listed on the screen.
• They can also be accessed by pressing the Params softkey on the right of the
screen.
•When the parameters are highlighted, it can be edited.
•To use the multipurpose knob, press it once and rotate it to increase or decrease
the number selected, using the left and right buttons to select different digits.
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•Alternatively, the number required can be typed using the numerical keypad.
Waveform Display Zone
•No waveform displays when setting the system, so the waveform graphic zone are
expanded for the parameter list.
START
Adjusting the Carrying Handle
• The Generator is designed with a carrying handle.
•To adjust the handle, hold it by either side and pull outwards.
• The handle will then be able to be moved into the desired position.
Outputting Basic Waveforms
•Once powered on, the Generator congures a default sine wave with 100mVp-p
sine wave with a 0V DC offset, with a frequency of 1kHz (into a 50Ω terminal).
Setting Output Frequency
To change the frequency to 2.5MHz, follow the steps below:
• Press Menu→Wave→Params→Freq button or
softkey.
•When you change the frequency, the same
frequency is used if the current frequency value
is valid for the new application.
•To modify the waveform period at this moment,
press the Freq softkey again to toggle between
“Period” and “Freq” labels.
•Enter the desired number “2.5” using the numeric keypad.
Select the desired unit
• Press the softkey that corresponds with the desired unit.
•Once the unit is selected, the Generator outputs the waveform with the displayed
frequency (if the output has been enabled).
•In this example, press the MHz softkey.
Note: You can also use the multipurpose knob and direction buttons together to set
this parameter.
Setting Output Amplitude
To change the amplitude to 300mVpp, follow the steps below:
• Press Menu→Wave→Params→Amp button or
softkey.
•When you change the amplitude, the same
amplitude is used if the current amplitude value
is valid for the new application.
• Press the Amp softkey again to quickly switch
between different units (Vpp, Vrms and dBm).
•Enter the desired number “300” via the numeric
keypad.
10
SETTING DC OFFSET VOLTAGE
To change the amplitude to 300mVpp, follow the below steps:
• Press Menu→Wave→Params→DC offset button or softkey.
•When you change the DC offset, the same DC offset is used if the current DC
offset value is valid for the new application.
• Press the DC offset softkey again and you will
find the original waveform that is defined by the
amplitude and the DC offset will change into
the one using high level (Max) and low level
(Min).
•Enter the desired number “1150mV” using the
numeric keypad.
Select the desired unit
• Press the softkey that corresponds with the desired unit.
•Once the unit is selected, the Generator outputs the waveform with the displayed
DC offset.
•In this example, press the mV softkey.
Note: You can also use the multipurpose knob and direction buttons together to set
this parameter.
Select the desired unit
• Press the softkey that corresponds with the desired unit.
•Once the unit is selected, the Generator outputs the waveform with the displayed
frequency (if the output has been enabled).
•In this example, press the mVpp softkey.
Note: You can also use the multipurpose knob and direction buttons together to set
this parameter.
SETTING THE SQUARE WAVE
• The duty cycle of square wave represents the amount of time per cycle that
the square wave is at a high level (on the assumption that the waveform is not
inverted).
•Once powered on, the duty cycle of the square wave defaults at 50%.
• The duty cycle is limited by 20ns minimum pulse width.
•To set the frequency to 1kHz, amplitude 1.5Vpp, DC offset to 0V and duty cycle
to 70% for the square wave, follow the below
steps:
• Press Menu→Wave→Type→Square→
Params softkey.
•In order to set up the required parameters,
press the softkey that corresponds to the
parameter, then enter the desired value and
finally select the desired unit.
Note: You can also use the multipurpose knob and direction buttons together to
modify the parameters.
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