Tenma 72-3555 Manual
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Tenma 72-3555 Manual

Usb dual channel waveform generator
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USB Dual Channel Waveform
Generator
Model: 72-3555
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Summary of Contents for Tenma 72-3555

  • Page 1 USB Dual Channel Waveform Generator Model: 72-3555...

  • Page 2: Table Of Contents

    CONTENTS Page Number Details What’s Included Important Safety Information Introduction Key Features Product Overview Rear Panel AC Power Receptacle Start Setting DC Offset Voltage Setting the Square Wave Setting the Pulse Waveform Setting DC Volts Setting the Ramp Waveform Setting the Noise Waveform Frequency Measurement Using the Built-in Help System Advanced Applications - Outputting Modulated Waveforms...

  • Page 3: What's Included

    Do not use any chemicals, abrasives or solvents that could damage the Generator. 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.

  • Page 4: Key Features

    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. •...
  • Page 5 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.

  • Page 6: Rear Panel

    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 •...

  • Page 7: Ac Power Receptacle

    • 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.
  • Page 8 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 •...

  • Page 9: Start

    • 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.

  • Page 10: Setting Dc Offset Voltage

    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.

  • Page 11: Setting The Pulse Waveform

    SETTING THE PULSE WAVEFORM • The duty cycle of square wave represents the amount of time from 50% threshold of rising edge to 50% threshold of next falling edge per cycle (on the assumption that the waveform is not inverted). •...

  • Page 12: Setting The Ramp Waveform

    SETTING THE RAMP WAVEFORM • Symmetry represents the amount of time per cycle when the ramp is positive. • Once powered on, the ramp symmetry is 100% by default. • To configure triangle waveform with the frequency set to 10kHz, the amplitude to 2V, DC offset to 0V and duty cycle to 50%, follow the steps as shown below.
  • Page 13 View help information of a function key • Pressing any softkey for 3 seconds, for example, the Menu button, will display a help message for that button. • Press Return to exit the help function. View help information of displayed messages •...
  • Page 14 Setting Carrier Frequency • Carrier frequency ranges could be different and depend on different carrier waves selected. • The default is at 1kHz for all functions. See the table below for details: Carrier Wave Min. Value Max. Value Sine 1µHz 25MHz Square 1µHz...

  • Page 15: Setting Modulation Shape Frequency

    • For example, modulation depth in the parameter list has been set to 100%, when +5V external modulation signal is applied, AM output amplitude goes up to maximum value; AM output amplitude goes down to the mimimum with external signal applied at -5V. SETTING MODULATION SHAPE FREQUENCY •...
  • Page 16 2) Setting Modulation Signal Parameters • With AM function enabled, use the multipurpose knob and direction buttons to complete the setup. You can also press Params in AM interface to reveal the display as shown right: • To set the desired parameter press the corresponding softkey, then enter in the desired value and select the unit as required.

  • Page 17: Frequency Modulation (Fm)

    4) Setting Modulating Depth • With the carrier parameters setup finished, press the Return softkey to return to the interface (right) and then set the modulating depth. • Use the multipurpose knob and direction buttons to complete the setup. You can press Params→Depth softkeys, then key in “80”...
  • Page 18 Selecting the Carrier • The FM carrier wave can be: sine, square, ramp or arbitrary waveform (except DC). The default is sine. • When FM is selected, press Carrier to access the carrier waveforms to select interface. Setting Carrier Frequency •...

  • Page 19: Setting Modulation Shape Frequency

    External Source • When you select external modulation source, modulation shape and modulation frequency items will no longer show on the parameter list. • FM frequency deviation is controlled by ±5V signal level present on the External Analogue Modulation Input (Modulation In) connector on the rear panel. •...
  • Page 20 Press Menu→Mod→Type→FM to switch on FM function. Setting modulation signal parameters • With FM interface enabled above, use the multipurpose knob and direction buttons to complete the setup. You can also press Params on the interface • above to reveal the display (right): •...

  • Page 21: Phase Modulation (Pm)

    Setting Frequency Deviation • With the carrier setup finished, press the Return softkey to return to the following interface and set frequency deviation. • Use multipurpose knob and direction buttons to complete the setup, or you can press the Params→FreqDev softkeys, then key in ‘5’ using the numeric keypad and press the kHz softkey to finish the setting.
  • Page 22 Selecting the Carrier Wave • The PM carrier wave can be: sine wave, square wave, ramp or arbitrary waveform (except DC). It is sine by default. When PM is selected, press Carrier to access carrier waves to select. Setting Carrier Frequency •...

  • Page 23: Setting Phase Deviation

    External Source • When you select External Source for modulation, the modulation shape and frequency items won’t show on the parameter list and the carrier is modulated by an external waveform. • Phase deviation is controlled by ±5V signal level presented on external analogue input (Modulation In) connector on the rear panel.
  • Page 24 • To set a desired parameter, press the corresponding softkey, then enter in the desired value and select the unit as required. Setting Carrier Parameters • Press Carrier→Type→Sine to select sine wave as carrier signal. The default is a sine wave. •...

  • Page 25: Amplitude-Shift Keying (Ask) Modulation

    Enabling Channel Output • Press the CH1 button on the front panel to switch on CH1 output directly, or press Utility after the label appears and press CH1 Setting to enable output. • With CH1 output enabled, the backlight of the CH1 button will illuminate and “Off”...
  • Page 26 Waveform Min. Value Max. Value Sine 1µHz 25MHz Square 1µHz 5MHz Ramp 1µHz 400kHz Pulse 500µHz 5MHz Arbitrary 1µHz 5MHz • To set the carrier frequency, select the carrier wave first and then use the multipurpose knob and direction buttons to set up the parameter or press Params→Freq softkeys, enter the desired frequency value and select the desired unit to complete the setting.
  • Page 27 modulation signal from the Generator itself, with a sine wave (2Vpp, at 15kHz) as the carrier, follow the steps below: • Note: Logic signal is determined by the internal rate generator, and you can only set up its frequency in order to change ASK rate; this frequency represents the rate at which the output shifts.

  • Page 28: Frequency-Shift Keying (Fsk) Modulation

    Enabling Channel Output • Press the CH1 button on the front panel to switch on CH1 output quickly, or press Utility and then press CH1 Setting, once the label appears, to enable the output. • With CH1 output enabled, the backlight of the CH1 button will illuminate and “Off”...
  • Page 29 Functions Min. Value Max. Value Sine 1µHz 25MHz Square 1µHz 5MHz Ramp 1µHz 400kHz Pulse 500µHz 5MHz Arbitrary 1µHz 5MHz • To set the carrier frequency, please select the carrier wave first, and then use the multipurpose knob and direction buttons to set up the parameter or press Params→Freq softkeys, enter the desired frequency value and select the desired unit to finish the setting.
  • Page 30 Functions Min. Value Max. Value Sine 1µHz 25MHz Square 1µHz 5MHz Ramp 1µHz 400kHz Pulse 500µHz 5MHz Arbitrary 1µHz 5MHz Setting FSK Rate • The shifting frequency between the carrier frequency and hop frequency are available to set up when you select internal modulation source. •...
  • Page 31 • To set the desired parameter, press the corresponding softkey, then enter in the desired value and select the unit as required. Setting Hop Frequency and FSK Rate • With the carrier setup finished, press the Return softkey to return to the interface (right): •...

  • Page 32: Phase-Shift Keying (Psk) Modulation

    PHASE-SHIFT KEYING (PSK) MODULATION • In PSK, you can configure the Generator to shift the output phase between present phase values (carrier phase and modulating phase). • The logic high/low level of modulation signal determines the output of the carrier/modulating phase.
  • Page 33 Internal Source • When the internal source is selected, internal modulation signal is the square wave (built-in and cannot be changed) with 50% duty cycle. • You can modify the PSK rate to define the frequency at which the output shifts between the carrier phase and the modulating phase.
  • Page 34 • You can use the multipurpose knob and direction buttons to complete the setup, or you can press the Params softkey on the interface to show the display (right): • To set the desired parameter, press the corresponding softkey, then enter in the desired value and select the unit as required.

  • Page 35: Pulse Width Modulation (Pwm)

    right of the CH1 label changes to “Mod” in yellow, indicating the CH1 output has been enabled. • PSK modulated waveform with an oscilloscope: PULSE WIDTH MODULATION (PWM) • In PWM, the modulated waveform consists of the carrier and modulation shape. •...
  • Page 36 Selecting Modulation Source • The Generator can offer both an internal and external modulation source. With PWM enabled the modulation source defaults at internal source. To modify the parameter, turn the multipurpose knob after switching on PWM interface or press Params→Mod→Source→Ext MHz to modify.
  • Page 37 duty cycle of current carrier. The duty cycle deviation can be set from 0% to 49.99% and defaults to 20%.To modify the parameter, switch on the PWM interface, then use the multipurpose knob and direction buttons or press Params→DutyDev to modify: •...
  • Page 38 • Use the multipurpose knob and direction buttons to complete the setup or press Params again on the interface to show the display (right). • To set the desired parameter, press the corresponding MHz softkey and then enter in the desired value and select the unit as required.

  • Page 39: Outputting Frequency Sweep Waveforms

    OUTPUTTING FREQUENCY SWEEP WAVEFORMS • In Frequency Sweep, the Generator, within the specified sweep time, steps from start frequency to stop frequency with linear or logarithmic spacing. • Internal, external and manual trigger source are available to select. The Generator can sweep sine, square, ramp and arbitrary waveforms.
  • Page 40 Functions Min. Value Max. Value Sine 1µHz 25MHz Square 1µHz 5MHz Ramp 1µHz 400kHz Pulse 500µHz 5MHz Arbitrary 1µHz 5MHz Sweep Mode • For linear sweep, the Generator varies the output frequency linearly during sweeping. The default is linear. • For logarithmic sweep, the Generator varies the output frequency logarithmically during sweeping.
  • Page 41 • When external triggering is selected, the Generator will accept a hardware trigger applied on the external digital modulation connector (FSK Trig). • Every time the Generator receives a polarized TTL pulse, it will enable a single sweep. Note: When you select external trigger source, trigger out option won’t show in the parameter list, because trigger out is executed using the FSK Trig connector, which cannot be used as external trigger input and internal trigger output at the same time.
  • Page 42 Enabling Frequency Sweep • Press Menu→Sweep→Type→Linear to switch on linear sweep function. Selecting Frequency Sweep Waveforms • With linear sweep enabled, press Carrier→Square MHz and the interface (right) will be on display: • In this interface, use the multipurpose knob and direction buttons to set the amplitude, or press Params to reveal the display shown (right).

  • Page 43: Outputting Impulse Train

    • To set the desired parameter, press the corresponding MHz, then enter in the desired value and select the unit as required. Enabling Channel Output • Press the CH1 button on the front panel to switch on CH1 output directly, or press Utility after the label pops up, press CH1 Setting to enable the output.
  • Page 44 With pulse train function enabled, press Carrier MHz to select sweep waveforms and the display (right) will be shown. Setting Waveform Frequency • In N-Cycle and Gated modes, waveform frequency defines the signal frequency during impulse trains. • In N-Cycle, impulse train is output with a specified number of cycles at a specified waveform frequency.
  • Page 45 • To modify the source, enter into burst type interface (see the figure at the bottom of page 44), then use the multipurpose knob and direction buttons or press Params→TrigSrc MHzs to complete the setup. • Note: When the external trigger source is selected, Trigger Out option won’t show on the parameter list, because Trigger Out is executed through the external digital modulation connector (FSK Trig) which cannot function as trigger input and output connectors at the same time.
  • Page 46 Impulse Train Phase • Impulse Train phase is the start phase of impulse train and ranges from -360° to 360°. It defaults to 0°. • To modify the parameter, enter the impulse train type interface, then use the multipurpose knob and direction buttons, or press Params→StartPhase to complete the setup.
  • Page 47 • When external triggering is selected, the Generator will accept a hardware trigger applied on the external digital modulation connector (FSK Trig) on the rear panel. Every time the connector receives a polarized TTL pulse, the Generator will output one impulse train. The impulse train can be N-Cycle, Gated or Infinite type. •...
  • Page 48 Applications • Firstly, enable impulse train mode. • To set a sine wave with 500mVpp amplitude, 5ms period as impulse train waveform and set impulse train types to N-cycle with impulse train period 15ms and cycle count 2, follow the steps below: Enabling Burst Function Press Menu→Pulse→Type→N-Cycle to set to •...

  • Page 49: Outputting Arbitrary Waveforms

    • Then use the multipurpose knob and direction buttons together to perform the setting, or press Params MHz to bring up the interface as shown right: • To set the desired parameter press the corresponding MHz, then enter in the desired value and select the unit as required.
  • Page 50 Point-by-Point Output/Play Mode • The Generator supports points-by-point mode of arbitrary waveform output. • Under point-by-point output mode the Generator will work out the output frequency based on waveform length and sample rate and then the output waveform point- by-point at this frequency, which can avoid losses of important waveform point during the output.

  • Page 51: Troubleshooting

    Type Name Type Name ExpFall SinH ExpRise CosH SosInt HaverSine Lorentz TanH Trigonometric Function Math Function Dlorentz Asin Sqrt AsinH ARB x2 Acos Cubic ACosH Gauss Atan LogNormal AtanH12 Laplace13 FlattopWin Boxcar Hamming Triang Window Function Hanning Window Function Blackman Kaiser8 ChebWin TROUBLESHOOTING...

  • Page 52: Updating The Generator

    Note: If the Generator doesn’t work after following the above guide, then please contact your point of purchase. UPDATING THE GENERATOR • Contact Tenma or visit the Tenma website to obtain the latest package. • Unzip the package and apply the embedded programme updating system to update the current programme.
  • Page 53 Modulation source Internal Modulation shape Sine Frequency Modulation frequency 100Hz 180° deviation Modulation source Internal Modulation shape Pulse Modulation frequency 100Hz Phase deviation Modulation source Internal ASK rate 100Hz Modulation source Internal FSK rate 100Hz Hop frequency 10kHz Modulation phase Internal PSK rate 10Hz...

  • Page 54: Technical Specification

    TECHNICAL SPECIFICATION Channel Dual Max. Frequency 25MHz Sample rate 125MSa/s Waveforms Sine, Square, Ramp, Pulse, Noise, DC, Arbitrary Working modes Gated, Continuous, Modulation, Sweep, Burst Modulation types AM, FM, PM, ASK, FSK, PSK, PWM WAVEFORM CHARACTERISTICS Sine Frequency range 1µHz~25MHz Resolution 1µHz 90 days: ±50ppm, 1 year: ±100ppm...
  • Page 55 Pulse Frequency range 500µHz~5MHz Resolution 1µHz Pulse width 40ns~2000s Variable edge 20ns~2ms (typical 24ns) Overshoot (typical) <2% Jitter 1ns + 100ppm of period Gaussian Noise Bandwidth Bandwidth 25MHz (-3dB) typical value DC Offset Range (peak AC + DC) ±5V (50Ω) Offset accuracy Arbitrary Waveform Characteristics Frequency range...
  • Page 56 Carrier waveforms Sine, Square, Ramp, Arbitrary Source Internal/External Modulating waveforms Sine, Square, Ramp, Noise, Arbitrary Modulating frequency 2MHz~50kHz Frequency deviation 1Hz~30MHz 1µHz~12.5MHz Carrier waveforms Sine, Square, Ramp, Arbitrary Source Internal/External Modulating waveforms Sine, Square, Ramp, Noise, Arbitrary Modulating frequency 2MHz~50kHz Phase deviation 0°~360°...
  • Page 57 Lock time <2s, typical External trigger TTL compatible Trigger Input Input level TTL compatible Slope Rise of fall, selectable Pulse width >100ns Input impedance >10Ω, DC-coupled Latency Sweep <500µs, typical Trigger Output Level TTL compatible to 500 Pulse width >400ns typical Output impedance 50Ω, typical Max.
  • Page 58 Mechanical Size 305mm x 230mm x 93mm 3.1kg (not inc. packaging) Weight 4.1kg (inc. packaging) CLEANING & MAINTENANCE • Do not store or place the Generator in places that leaves the LCD exposed to direct sunlight. • To avoid any damage to the Generator or the connection wires, keep them in a dry location.

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