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B&K Precision 4040B benchtop function generator front panel with display and controls

B&K Precision

B&K Precision 4040B 20 MHz Function Generator measurement tool

SKU CH-MHD7-0VA84

Generates sine, square and triangle waveforms from 0.01 Hz to 20 MHz with up to 20 Vpp output into 50 ohm impedance

  • TypeElectronic
  • DDS function generator covers 0.01 Hz to 20 MHz sine and square waves
  • Triangle waveform output from 0.1 Hz to 20 MHz for versatile signal testing
  • Sine distortion below -60 dBc up to 1 MHz and -45 dBc at 20 MHz
  • Square wave rise and fall time under 20 ns for fast edge response
  • Adjustable amplitude 10 mVpp to 10 Vpp into 50 ohm load

What it is

The B&K Precision 4040B is a 20 MHz DDS function generator built for bench testing and signal simulation. It produces sine, square and triangle waveforms with a frequency range from 0.01 Hz up to 20 MHz. Output amplitude spans 10 mVpp to 10 Vpp into 50 ohm and 20 mVpp to 20 Vpp open circuit.

Who it suits

Engineers and technicians needing a stable source for audio, RF and general-purpose stimulus will find the distortion specs useful: below -60 dBc to 1 MHz, -50 dBc to 5 MHz, -45 dBc to 12 MHz and -60 dBc to 20 MHz. Square-wave rise and fall times stay under 20 ns. Buyers who need higher frequency coverage or arbitrary waveform creation should look at a different class of instrument.

Build fit

The unit presents a 50 ohm output impedance, so it connects directly to matched loads or through attenuators for sensitive inputs. Its wide amplitude range lets you drive both low-level circuits and higher-voltage stages without external amplifiers. The continuous 0.01 Hz lower bound supports very slow sweep or modulation tasks that faster generators cannot reach.

Highlights

  • DDS function generator covers 0.01 Hz to 20 MHz sine and square waves
  • Triangle waveform output from 0.1 Hz to 20 MHz for versatile signal testing
  • Sine distortion below -60 dBc up to 1 MHz and -45 dBc at 20 MHz
  • Square wave rise and fall time under 20 ns for fast edge response
  • Adjustable amplitude 10 mVpp to 10 Vpp into 50 ohm load

Specifications

BrandB&K PRECISION
TypeElectronic

Questions about this item

What output impedance must my load or cable present to match the 4040B?

The generator has a fixed 50 ohm output impedance; use 50 ohm cables and termination for accurate amplitude.

Will the 4040B drive legacy 50 ohm oscilloscope inputs without an external attenuator?

Yes, it delivers 10 mVpp to 10 Vpp into 50 ohm and 20 mVpp to 20 Vpp open circuit, covering vintage scope ranges.

How can I verify the 4040B sine output meets its distortion spec after warm-up?

Measure harmonic content on a spectrum analyser: expect <-60 dBc up to 1 MHz, <-50 dBc to 5 MHz, <-45 dBc to 12 MHz, <-60 dBc to 20 MHz.

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