WF1973 / WF1974 – Multifuktionsgenerator

Wide array of functions for a broad range of applications

While the WF1973 and WF1974 can generate standard waveforms such as sine and square waves, application-specific waveforms such as Gaussian pulse and chattering, and arbitrary waveforms, these generators also have a wide array of functions, including sequence, modulation and sweep. These are up-and-coming general-purpose signal sources that are a must for engineers and should be kept on hand for a wide variety of applications.

Product Information




  • Wide Frequency Range
    0.01 µHz to 30 MHz
  • Various Types of Output Waveforms
    Equipped with standard, arbitrary and "parameter-variable" waveforms
  • Useful Programming Function
    The sequence function enables you to easily program output patterns
  • Wide Array of Oscillation Modes
    Continuous, burst/trigger/gate, internal/external modulation, sweep and sequence oscillation
  • 2-channel Mode
    Two independent channels, two phases, constant frequency difference, constant frequency ratio and differential output
  • Functions
    Synchronous operation of multiple units, usable as a pulse generator, external addition input, user-defined units and more
  • Pursuit of Usability
    Flat and lightweight (88 mm high, 2.1 kg), each channel insulated from the housing, USB/GPIB interface and more

Features & Functions

Fully equipped with the functions and performance that are required for Function Generators.

Wide Frequency Range

Oscillation Frequency 0.01 µHz to 30M Hz

High Accuracy

Above all else, function generators must be very accurate. The WF1973 and WF1974 are high-specification instruments that deliver exceptional precision, stability and reliability in support of a wide variety of applications.

Frequency accuracy:± (3 ppm of setting + 2 pHz
(External frequency reference of 10 MHz usable)
Frequency resolution:0.01 µHz
Amplitude accuracy:± (1% of amplitude setting [Vp-p] + 2 mVp-p)/open
Phase setting resolution:0.001° (setting range: -1800.000° to +1800.000°)
Dutty setting range: 0.0000% to 100.0000%; resolution 0.0001%
Pulse wave rising/falling time:15.0 ns to 58.8 Ms; 3-digit resolution/0.1 ns
Resolution of arbitrary waveform data amplitude:16 bits


 Various Types of Output Waveforms

Equipped with standard, arbitrary and "parameter-variable" waveforms.

Output Waveforms:
Sine, square, pulse, ramp, noise, DC, arbitrary and parameter-variable

Sine wave

Square wave

Pulse wave

Ramp wave
(Synmetry variable)

(Gaussian distribution)


Arbitrary Waveforms

Up to 512 K words/Waveform, 4 M words

Arbitrary waveforms up to 512 K words can be output. Up to 128 waveforms can be stored in the large 4 M words memory. Highly precise waveforms are generated using high-resolution (14-bit), high-speed (120M samples/sec) sampling. Waveforms can be generated easily either via the control panel (linear interpolation of control points) or in software using the Arbitrary Waveform Editor, which also allows external data to be imported and mathematical expressions to be applied.
Preprogrammed parameter-variable waveforms can be retrieved and edited as required.

Main unit editing screen

Arbitrary Waveform Editor


Parameter-Variable Waveforms

The desired waveform can be quickly generated. For more Details see "Parameter-Variable Waveforms"

Wide Array of Oscillation Modes

Oscillation Modes:
Continous, burst/trigger/gate, internal/external modulation, sweep and sequence

  • Sweep and modulation functions
    Frequency, phase, amplitude, DC offset and duty sweeps can be performed in one-way or shuttle, linear or logarithmic slope*, and continuous, single-shot or gated single-shot modes. Marker and X-drive outputs are available. DC offset modulation and PWM modes are supported as well as FM, FSK, PM, PSK, and AM—both internal and external modulation. These function generators can address a wide range of applications, including baseband functional testing for digital communications.

* Logarithmic mode is supported only for frequency sweeping.

Amplitude sweep

Gated sweep


Offset modulation



In the burst oscillation mode, oscillation can be started or
stopped at any wave count.
WF1973 and WF1974 support four modes;

  • Auto burst:
    No trigger is needed
  • Trigger burst:
    Oscillation in sync with the trigger
  • Gate:
    Oscillation in sync with the gate signal
  • Triggered gate:
    Gate oscillation switched on/off by gate upon trigger

The phase where oscillation starts/
stops and the level at which oscillation starts/stops can be set.


Triggered gate

3-value pulse

Full-wave ractification waveform


Sequence Function

Flexible program output patterns

2-channel Mode

Ideal 2-channel generator

 Other funtions


  • As pulse generator
    With great speed and operability, the WF1973 and WF1974 show excellent performance when used as a pulse generator or signal source for digital circuits. The duty/time, rising time, and falling time of pulse waves can be individually set, so these generators are best suited to operation testing of a wide variety of digital equipment and devices, data transmission equipment, and more.

Pulse width variable

Rising/falling time variable

Rising time (15 ns)
X: 10 ns/DIV, Y: 2 V/DIV

  • External 10 MHz frequency reference input, synchronous operation of multiple generators
    A high-accuracy frequency can be output when an external 10 MHz standard signal is input into the external 10 MHz frequency reference input (REF IN).
    Synchronous operation of up to six units is possible in the form of master/slave connections*, using the frequency reference output (REF OUT) and frequency reference input (REF IN). A multi-channel (multi-phase) oscillator can be configured.
    * A BNC cable is used for connection.
  • User-defined unit function
    AThe frequency, period, phase, amplitude, DC offset and duty can be set and displayed in desired unit (up to four characters), using a specified conversion expression.

Other features ......

  • Input/output signal ground independent of housing and signal ground between channels also insulated.
  • Output voltage under specified load impedance can be set and displayed.
  • External signals can be added and output.
  • Up to ten settings can be saved.
  • USB and GPIB interfaces
  • LabVIEW driver included.
  • Power supply input for 90 V AC to 250 V AC enables worldwide use.
  • Waveform display (TFT color LCD with the QVGA high resolution)
  • Flat and light body (88 mm high, approx. 2.1 kg)




Parameter-Variable Waveforms

Parameter-Variable Waveforms - The desired waveform can be quickly generated

NF has incorporated an innovative waveform library called a parameter-variable waveform function.
The parameter-variable waveform offers an easy-order waveform system. The appropriate waveform for your purpose can be generated easily: just select a preprogrammed waveform and edit it using parameters specific to your requirements. The 25 types of available waveforms include circuit-related, communication-related, and machine-related waveforms.


Names and variable parameters of preprogrammed waveforms (25 types)

1. Unbalanced sine2. Clipped sine3. CF controlled sine4. Conduction angle controlled sine

  • 1st half amplitude
  • 2nd half amplitude

  • Clip rate

  • Crest Factor

  • Conduction angle
5. Staircase sine6. Multi-cycle sine7. On-phase controlled sine8. Off-phase controlled sine

  • Number of steps

  • Number of cycles
  • Start phase

  • Complete-on phase
  • On-slope time


  • Off-phase
  • Off-slope ti
9. Chattering-on sine10. Chattering-off sine11. Gaussian pulse12. Lorentz pulse

  • On-phase
  • Number of chattering
  • On-state time
  • Off-state time

  • Off-phase
  • Number of chattering
  • On-state time
  • Off-state time

  • Standard deviation

  • Half value of width
13. Haversine14. Half-sine pulse15. Trapezoid pulse16. Sin(x)/x

  • Width

  • Width

  • Slope width
  • Upper base width

  • Number of zero crossings
17. Exponential rise18. Exponential fall19. 2nd-order LPF step response20. Damped oscillation

  • Time constant

  • Time constant

  • LPF natural frequency
  • LPF Q

  • Oscillation frequency
  • Damping time constant
21. Oscillation surge22. Pulse surge23. Trapezoid wave with offset24. Half-shine edge

  • Oscillation frequency
  • Damping time constant
  • Trailing time constant

  • Rising time
  • Duration time

  • Leading delay
  • Rising-slope width
  • Upper base width
  • Falling-slope width
  • Offset

  • Leading edge time
  • Trailing edge time
  • Duty
25. Bottom-referenced ramp

  • Symmetry

For example...


The CF (crest factor) can be set within a range from 1.41 to 10.00
and varied easily using the modify knob.
Waveforms generated in this way can be treated as standard
waveforms with respect to frequency, amplitude, oscillation mode
and other parameters.



Sequence Function

Sequence Function

Flexible Program Output patterns

The sequence function programs and sequentially outputs parameters such as waveform, frequency and amplitude. Repetition, jump and other such behavior can be programmed, so constantly changing signals—such as machine vibration and voltage fluctuation—and long complex output patterns can be generated easily. The sequence function allows sudden changes to parameters, and can be used with parameter-variable waveforms and sweep functions. The sequence function substantially expands the range of applications for which our function generators are suitable.

  • Parameters:
    waveform, frequency, phase, amplitude, DC offset, square wave duty, step time, hold operation,jump destination, number of jumps, step stop phase, branch operation, step termination control, and more
  • Number of steps: 1 to 255 per sequence
  • Number of saved sequences: 10
  • Maximum number of usable waveforms: 128

Program Example Using the Sequence Function

The following table shows the program (sequence list) used to generate the signal on the left. The WF1973 and WF1974 can execute such simple programs automatically. The Sequence Editor facilitates generation, editing, and a number of other processes for more complicated programs.



Step time


 Sequence Editor


2-Channel Mode

2-Channel Mode

Ideal 2-Channel generator


WF1974 rear panel

  • Independent output (Indep)
  • Two phase (2-Phase)
  • Constant frequency difference (2 Tone)
  • Constant frequency ratio (Ratio)
  • Differential output (Diff)

Two channels programmed separately
Same frequency
Difference in frequencies is constant
Ratio of frequencies is constant
Reverse phase waveform with identical frequency, amplitude and DC offset

Two channels independent

Differential output



We can satisfy a variety of waveform-related needs.


  • Electronic equipment and parts
    Ultrasonic motor drive testing, differential/balanced input testing, LCD panel operation testing, copier drum (developing bias) testing, digital circuit evaluation testing, and evaluation of ICs
  • Communication and audio equipment
    Testing of echo cancellers which act as IQ signal generator/clock sources for next-generation mobile communication systems, amplifier and speaker tone burst testing and linearity measurement, and wireless communication equipment evaluation testing
  • Automobiles
    Gear rotation signal simulation, precision work for turbo chargers, inverter evaluation, ABS and power-steering device testing, ECU and sensor operation testing
  • Machinery, controls, and construction
    Industrial robot and servo system adjustment and testing, pulse motor driving, building vibration experiments (for incorporating vibration testers), water-tank-based wave generation tests, and material fatigue testing
  • Other applications
    Simulation of biosignals, electrolysis, electroplating, and battery charge/discharge testing, breaker testing, three-phase power source simulation, power source modulation testing, a frequency standard for measurement equipment management room, experiments and science projects in universities and technical colleges


Accessories & Options


  • Instruction Manual (Basic)
  • CD
  • PDF manuals, Arbitrary Waveform
  • Editor
  • Sequence Editor, LabVIEW driver
  • Power cord set


Multi input/output cable PA-001-1318

Multi input/output cable (Option)