# B&K Precision 4045B 20 MHz DDS Sweep Function Generator with Arb Function (Pre-Owned) # B&K Precision 4045B 20 MHz DDS Sweep Function Generator with Arb Function (Pre-Owned) ## Key Features At A Glance - Sine and square output from 0.01 Hz to 20 MHz; triangle/ramp to 2 MHz - 12-bit arbitrary waveform generator at 50 MSa/s with 1,000-point waveform memory - Output range 10 mVpp to 10 Vpp into 50 Ω (20 mVpp to 20 Vpp open circuit) with -4.99 V to 4.99 V DC offset - Independent output and DC offset amplifiers allow small-amplitude signals on large DC offsets - Linear and logarithmic sweep (10 ms to 100 s) plus AM and FM modulation with internal or external source - Low-jitter square wave (<100 ps rms cycle-to-cycle typical) with ≤20 ns rise/fall time - Built-in frequency counter (50 Hz to 50 MHz) with auto-ranging up to 8 digits - USB interface with SCPI-compliant command set; arbitrary waveform editing and remote control software provided The BK Precision 4045B is a 20 MHz DDS (direct digital synthesis) sweep function generator with arbitrary waveform capability. It produces sine, square, triangle, and user-defined arbitrary waveforms with variable output from 10 mVpp to 10 Vpp into a 50 Ω load (up to 20 Vpp into open circuit), a continuously variable DC offset, and a built-in frequency counter. A bright color LCD displays a preview of the output waveform alongside the active frequency, amplitude, and offset parameters. The 4045B is suited to education and to applications that require a DDS function generator with sweep, modulation, and arbitrary waveform capabilities. The unit supports continuous, triggered, gate, and burst output modes, and its low-jitter square wave generation supports simulating clock signals, generating triggers, and validating serial data buses. AM and FM modulation are available with both internal and external sources, and linear or logarithmic sweep covers 10 ms to 100 s sweep times. ## Accessories Supplied - Power cord - USB (type A to B) interface cable - Certificate of calibration ## Product Core & Specifications \> Specifications — 4045B Frequency Characteristics Sine 0.01 Hz to 20 MHz Square 0.01 Hz to 20 MHz Triangle 0.01 Hz to 2 MHz Resolution 6 digits\* or 10 mHz Accuracy (Sine) 0.002% (20 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 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 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 Ω) 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 Ω) 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) Arbitrary Waveform Characteristics Sampling Rate 20 ns to 50 s Vertical Resolution 12 bits Accuracy 0.001% Resolution 4 digits Waveform Length 2 to 1000 points 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 Amplitude Modulation — Internal 0.1 Hz – 20 kHz sine, square, or triangle waveform Amplitude Modulation — External 5 Vp-p for 100% modulation, 10 kΩ input impedance Frequency Modulation — Internal 0.1 Hz – 20 kHz sine, square, or triangle waveform Frequency Modulation — 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 Trigger IN TTL compatible; Maximum rate 1 MHz; Input impedance 1 kΩ; Minimum width > 50 ns 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 1,000 points in flash memory Power Requirements 100 V – 240 V AC ± 10%, 47-63 Hz 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 Warranty Three-Year Warranty Included Accessories Power cord, USB (type A to B) interface cable, certificate of calibration **Important:** Maximum amplitude into 50 Ω is 10 Vpp (20 Vpp into open circuit), and DC offset range is -4.99 V to 4.99 V into 50 Ω. The main output is protected against short circuit and accidental applied voltage.**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.**Important:** For square wave, frequency resolution is up to 4 digits when frequency is > 20 kHz. ## About this used unit - Warranty included - Functional verification included - Standard Calibration Upgrade Options: No Calibration Required, NIST Traceable, Z540.1 or ISO 17025 with Data, Z540.3 Guardbanding with Data. - Note that unnecessary accessories may not be included (contact Test Architect to confirm). **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.** ## Details - **Price:** 0.0 USD - **Vendor:** B&K Precision - **Type:** Func Gen - **Tags:** BK Precision, Function, Manufacturers, product_manual_group_3, Product_used, Signal Generators ## Variants | Variant | Price | Available | |---------|-------|-----------| | Default Title | 0.00 USD | In stock | ## Images - B&K Precision 4045B 20 MHz DDS Sweep Function Generator with Arb Function (Pre-Owned) --- > Source: [ValueTronics](https://valuetronics.com/products/4045b-b-k-precision-function-generator-used) > Updated: 2026-05-30