B&K Precision 4047B 20 MHz Dual Channel Function / Arbitrary Generator

Key Features At A Glance

• Dual-channel operation with each channel providing rated 10 Vpp amplitude across the entire frequency range
• Sine and square waveforms to 20 MHz; triangle to 2 MHz; pulse to 20 MHz
• True point-by-point 14-bit, 125 MSa/s, 16-kpt arbitrary waveform generator architecture
• AM, FM, PM, FSK, and PWM modulation with internal and external sources
• Linear and logarithmic sweep, gate and burst mode, plus built-in 50 Hz to 50 MHz counter
• Independent output and DC offset amplifiers allow small-amplitude signals with large DC offsets up to ±4.99 V
• Low-jitter square wave output (<50 ps rms cycle-to-cycle, typical) for clock simulation and serial bus validation
• USB interface with SCPI-compliant command set and WaveXpress waveform editing software compatibility

The BK Precision 4047B is a 20 MHz dual-channel function and arbitrary waveform generator that produces stable and precise sine, square, triangle, pulse, and arbitrary waveforms. CH1 and CH2 outputs are fully independent with individual on/off buttons, and both channels deliver the rated 10 Vpp amplitude into 50 ohms (up to 20 Vpp into open circuit) across the full frequency range. The instrument combines a DDS engine for standard sine and triangle waveforms with a true point-by-point arbitrary waveform generator, giving the user both high frequency resolution and improved signal integrity for custom waveforms.

The 4047B is suited to a wide range of applications including electronic design, sensor simulation, functional test, and serial data bus validation. Linear and logarithmic sweep capability, AM/FM/PM/FSK/PWM modulation, and a continuously variable DC offset let the user inject signals directly into circuits at the correct bias level. Separate output amplitude and DC offset amplifiers allow a large DC offset (for example, ±4.99 V) to be combined with a small amplitude output signal (such as 10 mV) — a configuration useful when stimulating circuits that require precise bias conditions alongside small AC perturbations.

Accessories Supplied

• Power cord
• USB (type A to B) interface cable
• Certificate of calibration

Product Core & Specifications

Specifications	4047B
Channels	2
Frequency Characteristics
Sine	0.01 Hz - 20 MHz
Square	0.01 Hz - 20 MHz
Triangle	0.01 Hz - 2 MHz
Pulse	0.01 Hz - 20 MHz
Resolution	up to 8 digits
Accuracy	0.001% (10 ppm); at < 500 Hz: 0.001% + 0.006 Hz
Output Characteristics
Amplitude Range	10 mVpp to 10 Vpp (into 50 Ω); 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 20 MHz
Offset Range	-4.99 V to 4.99 V (into 50 Ω)
Offset Resolution	10 mV, 3 digits
Offset Accuracy	± 2% ± 10 mV (into 50 Ω)
Output Impedance	50 Ω ± 2%
Output Protection	Protected against short circuit or accidental voltage practically available in electronic laboratories, applied to the main output connector
Waveform Characteristics
Harmonic Distortion (3 Vp-p into 50 Ω)	0 - 1 MHz, < -60 dBc; 1 MHz - 5 MHz, <-50 dBc; 5 MHz - 12 MHz, <-45 dBc; 12 MHz - 20 MHz, < 50 dBc
Rise/Fall Time (square, pulse)	≤ 20 ns (10% to 90% at full amplitude into 50 Ω)
Variable Duty Cycle/Symmetry	Square: 20% - 80% to 2 MHz; Triangle: 1% - 99% in 1% steps, up to 200 kHz
Symmetry Accuracy at 50%	± 1%
Pulse Width (period 100 s - 50 ns)	10 ns to <(Period - 10 ns), 10 ns resolution
Variable Edge Time	100 ns to Width/0.625 (50 % duty cycle); 10 ns resolution
Jitter (square, pulse)	< 50 ps rms (cycle-to-cycle, typical)
Arbitrary Waveform Characteristics
Sampling Rate	8 ns to 100 s
Vertical Resolution	14 bits
Accuracy	0.001%
Resolution	4 digits
Waveform Length	2 to 16,382 points
Jitter	< 50 ps rms (cycle-to-cycle, typical)
Operating Modes
Continuous	Output continuous at programmed parameters
Triggered	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 completed.
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
AM - Carrier	Sine, Square, or Triangle
AM - Source	Internal, External
AM - Internal Modulation	0.1 Hz - 20 kHz
AM - Depth	0% to 100%
FM - Carrier	Sine, Square, or Triangle
FM - Source	Internal, External
FM - Internal Modulation	0.1 Hz - 20 kHz
FM - Deviation	1 µHz to max frequency/2
FSK - Carrier	Sine, Square, or Triangle
FSK - Source	Internal, External
FSK - Rate	≤ 100 kHz
PM - Carrier	Sine, Square, or Triangle
PM - Source	Internal, External
PM - Internal Modulation	0.01 Hz - 20 kHz
PM - Deviation	0 - 360 °, 0.1 ° resolution
PWM - Source	Internal, External
PWM - Width	1% to 99%
PWM - Internal Modulation	0.01 Hz - 100 kHz
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; Minimum width > 50 ns; Input impedance 1 kΩ
Sync OUT	TTL pulse at programmed frequency; 50 Ω source impedance
Modulation IN	5 Vp-p for 100% modulation; 10 kΩ input impedance; DC to > 20 kHz minimum bandwidth
Counter Characteristics
Range	50 Hz to 50 MHz
Resolution	Auto ranging, up to 8 digits
Accuracy	± 0.02% ± 2 digits
Sensitivity	25 mVrms typical
General
Memory Storage	20 instrument settings
Arbitrary Memory	16,382 points in flash memory
Power Requirements	100 V - 240 V AC ± 10%, 47-63 Hz
Max. Power Consumption	< 30 VA
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)
Safety and EMC Standards	EN55011 for radiated and conducted emissions; EN55082, EN61010, CE approved
Warranty	Three-Year Warranty

Important: Maximum amplitude is specified into a 50 Ω load (10 Vpp); open-circuit output reaches 20 Vpp. Verify load impedance when setting amplitude to ensure the signal level delivered to the DUT matches the intended programmed value.Important: All specifications apply to the unit after a temperature stabilization time of 15 minutes over an ambient temperature range of 23 °C ± 5 °C.Recommended pairing: use with WaveXpress waveform editing software to generate, edit, and upload custom arbitrary waveforms via the USB interface to the 14-bit, 125 MSa/s, 16,382-point arbitrary engine.

Please review the Manufacturer's Data Sheet to verify published specifications. Feedback on this webpage is always welcome — please reach out to your Test Architect at any time for questions or concerns. Thank you, we truly appreciate you being our customer.