WF1947 / WF1948 – Funktionsgenerator

"The Function Generator" that NF offers.

Ever since NF developed the first function generator in Japan, we’ve been addressing the true needs of our customers. Our function generators have been evolving along with our customers’ desires and our determination to satisfy them.

These new products are new additions to our WAVE FACTORY product lineup. WAVE FACTORY products boast accurate and stable output, an abundance of output waveforms, various oscillation modes for various purposes, outstanding user-friendliness and the flexible generation of waveforms that engineers need.
NF considers oscillators that offer the flexible generation of waveforms as the standard, and we continue to offer function generators with ever more advanced functions.


Low noise

The noise level is reduced to roughly one-tenth of those of previous models* at comparatively high voltage output (about 2Vp-p/50Ω, without DC superposition) and within frequencies of up to 300kHz. By employing an attenuator, the noise level at the low voltage output of about 1Vp-p or lower has been reduced to between a half and one-third those of previous models. In all of the output ranges, dramatic noise reduction has been realized, which makes this product perfect for a wide range of uses.

Low distortion

A complete revision of the circuitry has realized the generation of low-distortion sine waves with total harmonic distortion of 0.04% or less. In addition to the 16-bit resolution of waveform amplitude, high-quality sine waves are produced.(Frequency setting range: 20Hz-20k Hz, amplitude: 0.25Vp-p/50Ω or greater)

Waveform amplitude resolution: 16 bits
The circuit structure we developed has realized a 16-bit resolution of waveform amplitude, which is the highest of any oscillator designed for a maximum frequency of 30MHz. High-quality 16-bit resolution of waveform amplitude is provided for all the waveforms you might need, including sine, square and arbitrary waveforms.

High amplitude setting accuracy

The auto range function facilitates the optimum selection of output voltage range, according to the amplitude and DC offset (including high/low level settings) settings. Further, by reducing the deterioration of the amplitude setting accuracy due to the setting level, it is possible to obtain a very high amplitude setting accuracy.


Each output terminal is insulated from the housing, which makes it possible to connect the terminal to equipment with dissimilar electric potentials. The inclusion of floating output terminals reduces noise caused by ground loops.

Low fan noise

The rotational frequency (OR revolution per minute) of the fan is controlled according to the detected ambient temperature. At normal room temperature, excluding start-up and abnormal operation, the noise is one-tenth of that of previous models*.

* Previous models : WF1973/WF1974


Wide Array of Output Waveforms

Sine, Square, Pulse, Ramp, Arbitrary waveforms, Noise, DC
In addition to generating standard waveforms such as sine and square waveforms, it is possible to generate arbitrary waveforms of up to 512k words. Up to 128 waveforms can be stored in the 4M-word memory. All the generated waveforms have 16-bit high resolution. High-quality waveforms are indispensable for improvement in the repeatability (OR reproductivity) of tests.
Arbitrary waveforms can be set on the main unit, and the provided arbitrary waveform creation software “Arbitrary Wave Editor” makes waveform editing smooth.


Sine Wave

Square Wave

Pulse Wave
(Rising/falling time variable)

Ramp Wave
(Symmetry Variable)

(Gaussian distribution)

Arbitrary Wave



Various Oscillation Modes

Sweep and Modulation Functions

It's possible to perform sweeps not only of frequencies, but also of amplitudes, phases, offsets and duties (0% to 100%). In sweeping, it is possible to combine one-way or shuttle, linear or logarithmic slope*, and continuous, single-shot or gated single-shot modes.
FM, FSK, PM, PSK, AM and DC offset modulations and PWM mode are supported. Internal and external modulations are possible.
*Logarithmic mode is supported only for frequency sweeping.

Gated Sweep

Offset Modulation



Burst / Trigger / Gate

In the burst oscillation mode, oscillation can be started or stopped at any wave count.WF1947 and WF1948 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
(Burst / Trigger)

Full-wave Rectification
Waveform (Burst / Trigger)


As Pulse Generator

You can use this waveform generator as a signal source for digital circuits or a pulse generator. The duty/time and the rising time/falling time of pulse waves can be individually set. The generator is suited to the 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)


2-channel Ganged Operation

The dual-channel WF1948 offers channel modes of two phases, constant frequency difference, constant frequency ratio and differential outputs. Various types of sweeps are possible withthe two channels in ganged operation mode.
Each channel has a floating output terminal.

  • Independent output (Indep)
    Two channels programmed separately.
  • Two phase (2-Phase)
    Same frequency.
  • Constant frequency difference (2-Tone)
    Difference in frequencies is constant.
  • Constant frequency ratio (Ratio)
    Ratio of frequencies is constant.
  • Differential output (Diff)
    Reverse phase waveform with identical frequency,amplitude, and DC offset.

Two Channels Independent

Differential Output



Other Functions

  • External 10MHz frequency reference input, frequency
    reference output, synchronous operation of multiple ge6nerators
    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).

  • External addition input
    This adds external signals to the waveform output signal.

  • User-defined unit
    The value in any unit can be set using a specified conversion expression.(Frequency, period, amplitude, DC offset, phase, and duty)

  • Waveform monitor
    This displays the set waveform.

  • Memory to save setting
    Ten settings can be saved





Unit: mm



Unit: mm