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Data Sheet
DDS Sweep Function Generators
Models 4014B and 4040B
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 Ω (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
buses.
These models are suitable for education and
other applications that require digital function
generators with sweep and modulation
capabilities.
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
Technical data subject to change
© B&K Precision Corp. 2013
www.bkprecision.com
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DDS Function Generators
odels 4014B and 4040B
M
Front panel
Color LCD display Numeric keypad
Menu function keys
Rear panel
Dedicated
waveform keys
Lin/Log sweep key Modulation
key
Utility
key
Sync output
Rotary
control knob
Output
On/Off button
Main output
Intuitive user interface
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.
Versatile tools
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
signal.
Trigger/counter input connector
Modulation input connector
2
USB interface
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
programming.
www.bkprecision.com
Page 3
DDS Function Generators
odels 4014B and 4040B
M
Specifications 4014B 4040B
requency Characteristics
F
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
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
DC Offset Range -4.99 V to 4.99 V (into 50 Ω)
DC Offset Resolution 10 mV, 3 digits
DC Offset Accuracy ± 2% ± 10 mV (into 50 Ω)
Output Impedance 50 Ω ± 2%
Output Protection
Waveform Characteristics
Harmonic Distortion
(for sine wave at
5 Vp-p into 50 Ω)
Protected against short circuit or accidental voltage applied
0 – 1 MHz, < -60 dBc
1 MHz – 5 MHz, <-50 dBc
5 MHz – 12 MHz, <-45 dBc
Square Rise/Fall Time ≤ 20 ns (10% to 90% at full amplitude into 50 Ω)
Duty Cycle
Symmetry Accuracy
at 50%
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,
Triggered
at which time one waveform cycle is generated to programmed
parameters. Frequency of waveform cycle is limited to 1 MHz.
Gate -
Burst - 2-65535 cycles
Trigger Source
*For square wave, resolution is up to 4 digits when frequency is > 20 kHz.
10 mVpp to 10 Vpp (into 50 Ω);
20 mVpp to 20 Vpp (open circuit)
± 0.5 dB to 1 MHz
± 1 dB to 20 MHz
to the main output connector
0 – 1 MHz, < -60 dBc
1 MHz – 5 MHz, <-50 dBc
5 MHz – 12 MHz, <-45 dBc
12 MHz – 20 MHz, <-50 dBc
Square: 20% - 80% to 2 MHz
Triangle: 1% - 99% in 1% steps, up to 200 kHz
± 1%
Same as triggered mode, except
waveform is executed for the
duration of the gate signal.
The last cycle started is
completed.
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 kΩ 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 kΩ input impedance
Sweep Characteristics
Sweep Shape Linear or Logarithmic, up or down
Sweep Time 10 ms to 100 s
Input and Output
TTL compatible
Trigger IN
Maximum rate 1 MHz
Input impedance 1 kΩ
Minimum width > 50 ns
Sync OUT TTL pulse at programmed frequency; 50 Ω source impedance
5 Vp-p for 100% modulation
Modulation IN
10 kΩ input 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
General
Memory Storage 10 instrument settings 20 instrument settings
Power Requirements 100 V – 240 V AC ± 10%
Operating
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
Dimensions
(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)
Electromagnetic
Compatibility
Meets EMC Directive 2004/108/EC, EN55011, EN55082
Safety Meets Low Voltage Directive 2006/95/EC, EN61010
Three-Year Warranty
Included Accessories
Instruction manual on CD, power cord, USB (type A to B)
interface cable, certificate of calibration
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.
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v112713
www.bkprecision.com
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