Data Sheet

20 MHz Dual Channel Function / Arbitrary Generator

Model 4047B

Technical data subject to change

© B&K Precision Corp. 2019

www.bkprecision.com

Features & Benefits

n

Dual-channel operation with each channel

providing the rated amplitude (10 Vpp) over

the entire frequency range

n

Sine and square waveforms up to 20 MHz

n

True point-by-point 14-bit, 125 MSa/s, 16-kpt

arbitrary waveform generator

n

Bright color display with waveform preview

n

Synchronize the phase of both channels with

the push of a button

n

Linear and logarithmic sweep

n

AM, FM, PM, FSK, and PWM internal and

external modulation capabilities

n

Gate and burst mode

n

Independent output and DC offset amplifiers

allow for small amplitude output signals with

large DC offsets

n

Low-jitter square wave generation for

simulating reliable clock signals, generating

triggers, or validating serial data buses

n

USB interface

n

SCPI-compliant command set

n

Internal/external triggering

n

Built-in counter

n

Short circuit protection for resistive and

capacitive loads on outputs and overvoltage

protection on inputs

The 4047B Dual Channel Function/Arbitrary

Waveform Generator is capable of generating

stable and precise sine, square, triangle, pulse,

and arbitrary waveforms. CH1 and CH2 outputs

are fully independent with individual on/off

buttons and can both be varied from 0 to 10 Vpp

into 50 ohms (up to 20 Vpp into open circuit).

The generator provides linear and logarithmic

sweep capabilities, AM/FM/PM/FSK/PWM

modulation, and a continuously variable DC offset

to inject signals directly into circuits at the

Applications

This generator is suitable for a wide range of

applications including electronic design,

sensor simulation, functional test, or serial

data bus validation.

For more information, visit www.bkprecision.com/WaveXpress

Fig 1 - DDS

Phase

Accumulator

Phase to

Amplitude

Conversion

DAC

Dual architecture design

The 4047B’s dual architecture, a feature typically only found in more expensive generators, provides all the

benefits of a DDS and a true point-by-point arbitrary waveform generator (AWG) combined, without any

limitations imposed by either technology. The DDS chip produces standard sine and triangle waveforms

with high frequency resolution and at a low cost. The true point-by-point AWG implementation (Fig 2)

offers improved signal integrity for arbitrary waveforms by producing significantly less jitter and distortion

compared to a DDS-based architecture. Custom arbitrary waveform generation is implemented with a

variable clock signal to reproduce each point stored in memory without skipping or repeating data points, a

problem typically found in DDS based designs with fixed reference clocks.

Fig 2 - point-by-point AWG

Waveform

Memory

DAC

Low jitter clock

(variable)

Reference clock (fixed)

Freq.

control

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).

The 4047B seamlessly integrates with B&K

Precision’s waveform editing software WaveXpress,

allowing users to generate complex arbitrary

waveforms that can be output via the instrument’s

14-bit, 125 MSa/s, 16 kpts arbitrary waveform

generator.