4014B,4040B Datasheet by B&K Precision

DDS Sweep Function Generators
Models 4014B and 4040B
Data Sheet
Technical data subject to change
© B&K Precision Corp. 2018
Models 4014B and 4040B are 12 MHz and
20 MHz DDS (direct digital synthesis) function
generators that generate stable and precise sine,
square, and triangle waveforms. Both models
provide variable output voltages from 0 to
10 Vpp into 50 (up to 20 Vpp into open
circuit), linear and logarithmic sweep, AM/FM
modulation, built-in counter, and a continuously
variable DC offset that allows the output to be
injected directly into circuits at the correct bias
level. Separate output amplitude and DC offset
amplifiers let you set a large DC offset (e.g.
± 4.99 V ) with a small amplitude output signal
(e.g. 10 mV), a feature typically found in more
expensive generators.
The 4014B and 4040B are both designed
with a dual technology architecture, combining
traditional DDS technology with a low-jitter
square wave generator. The instruments
generate a 2-point waveform to simulate the
amplitude and use a high accuracy PLL
(phase-locked loop) circuit for timing. Compared
to signals generated by typical low-cost DDS
function and arbitrary waveform generators, this
implementation significantly minimizes jitter and
improves edge stability of square waves. The
improved signal integrity allows these generators
to be used for simulating reliable clock signals,
generating triggers, or validating serial data
These models are suitable for education and
other applications that require digital function
generators with sweep and modulation
Features & Benefits
Sine and square waveforms up to
12 MHz (4014B) or 20 MHz (4040B)
Triangle/ramp waveforms up to
1 MHz (4014B) or 2 MHz (4040B)
Bright color display with waveform preview
Linear and logarithmic sweep
AM/FM modulation
Independent output and DC offset amplifiers
allow for small amplitude output signals with
large DC offsets
Low-jitter square wave generation
Adjustable duty cycle
Output ON/OFF button
Internal/external triggering
Gate and burst mode (4040B only)
Built-in counter
USB interface
SCPI-compliant command set
Short circuit and overvoltage protection on all
inputs and outputs
Model 4014B 4040B
Sine and square frequency range 0.01 Hz - 12 MHz 0.01 Hz - 20 MHz
Triangle/ramp frequency range 0.01 Hz - 1 MHz 0.01 Hz - 2 MHz
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DDS Function Generators
Models 4014B and 4040B
On/Off button
Main output
USB interface
Modulation input connector
Trigger/counter input connector
control knob
Color LCD display Numeric keypad
waveform keys
Lin/Log sweep key Modulation
Sync output
Easily change all waveform parameters using the
intuitive menu-driven front panel keypad, rotary
control knob, and large color LCD display that
shows a preview of the output waveform.
Convenient waveform and range selection buttons
let users make quick and precise adjustments to
the output signal.
Front panel
Rear panel
Menu function keys
Intuitive user interface
Versatile tools
Easy PC connectivity
The function generators can be programmed
remotely via the USB (virtual COM) interface
using SCPI commands. B&K Precision also offers
application software (available for download at
www.bkprecision.com) that provides virtual front
panel emulation, allowing users to remotely
control their instrument without the need for
Both models provide AM and FM modulation
along with linear/logarithmic sweep and built-in
counter capabilities. Internal and external sources
can be used for triggering and modulating the
DDS Function Generators
Models 4014B and 4040B
*For square wave, resolution is up to 4 digits when frequency is > 20 kHz.
Note: All specifications apply to the unit after a temperature stabilization time of 15 minutes over an ambient temperature range of 23 ºC ± 5 ºC.
Specifications are subject to change without notice.
Specifications 4014B 4040B
Frequency Characteristics
Sine 0.01 Hz to 12 MHz 0.01 Hz to 20 MHz
Square 0.01 Hz to 12 MHz 0.01 Hz to 20 MHz
Triangle 0.01 Hz to 1 MHz 0.01 Hz to 2 MHz
Resolution 6 digits* or 10 mHz
Accuracy 0.01% ± 0.006 Hz
Output Characteristics
Amplitude Range 10 mVpp to 10 Vpp (into 50 );
20 mVpp to 20 Vpp (open circuit)
Amplitude Resolution 3 digits (1,000 counts)
Amplitude Accuracy ± 2% ± 20 mV of programmed output from 1.01 V – 10 V
Flatness ± 0.5 dB to 1 MHz
± 1 dB to 12 MHz
± 0.5 dB to 1 MHz
± 1 dB to 20 MHz
DC Offset Range -4.99 V to 4.99 V (into 50 )
DC Offset Resolution 10 mV, 3 digits
DC Offset Accuracy ± 2% ± 10 mV (into 50 )
Output Impedance 50 ± 2%
Output Protection Protected against short circuit or accidental voltage applied
to the main output connector
Waveform Characteristics
Harmonic Distortion
(for sine wave at
5 Vp-p into 50 )
0 – 1 MHz, < -60 dBc
1 MHz 5 MHz, <-50 dBc
5 MHz 12 MHz, <-45 dBc
0 – 1 MHz, < -60 dBc
1 MHz 5 MHz, <-50 dBc
5 MHz 12 MHz, <-45 dBc
12 MHz 20 MHz, <-50 dBc
Square Rise/Fall Time 20 ns (10% to 90% at full amplitude into 50 )
Duty Cycle Square: 20% - 80% to 2 MHz
Triangle: 1% - 99% in 1% steps, up to 200 kHz
Symmetry Accuracy
at 50% ± 1%
Jitter (square) < 100 ps rms (cycle-to-cycle, typical)
Operating Modes
Continuous Output continuous at programmed parameters
Output quiescent until triggered by an internal or external trigger,
at which time one waveform cycle is generated to programmed
parameters. Frequency of waveform cycle is limited to 1 MHz.
Gate -
Same as triggered mode, except
waveform is executed for the
duration of the gate signal.
The last cycle started is
Burst - 2-65535 cycles
Trigger Source Trigger source may be internal, external, or manual.
Internal trigger rate 0.1 Hz – 1 MHz (1 us 10 s)
Modulation Characteristics
Amplitude Modulation
Internal 0.1 Hz 20 kHz sine only 0.1 Hz 20 kHz sine, square,
or triangle waveform
External 5 Vp-p for 100% modulation, 10 k input impedance
Frequency Modulation
Internal 0.1 Hz 20 kHz sine only 0.1 Hz 20 kHz sine, square,
or triangle waveform
External 5 Vp-p for 100% modulation, 10 k input impedance
Sweep Characteristics
Sweep Shape Linear or Logarithmic, up or down
Sweep Time 10 ms to 100 s
Input and Output
Trigger IN
TTL compatible
Maximum rate 1 MHz
Input impedance 1 k
Minimum width > 50 ns
Sync OUT TTL pulse at programmed frequency; 50 source impedance
Modulation IN
5 Vp-p for 100% modulation
10 kinput impedance
DC to > 20 kHz minimum bandwidth
Counter Characteristics
Range 50 Hz to 25 MHz
Resolution Auto ranging, up to 8 digits
Accuracy ± 0.02% ± 2 digits
Sensitivity 100 mVrms typical
Memory Storage 10 instrument settings 20 instrument settings
Power Requirements 100 V 240 V AC ± 10%
Temperature 32 °F to 122 °F (0 °C to 50 °C)
Storage Temperature 14 °F to 158 °F (-10 °C to 70 °C)
Humidity 95% R.H. 0 °C to 30 °C
(W x H x D) 8.39” x 3.46” x 8.27” (213 x 88 x 210 mm)
Weight 5.5 lbs (2.5 kg)
Compatibility Meets EMC Directive 2004/108/EC, EN55011, EN55082
Safety Meets Low Voltage Directive 2006/95/EC, EN61010
Three-Year Warranty
Included Accessories Power cord, USB (type A to B) interface cable, certificate
of calibration