ATF20B+ 20MHz Dual Channel DDS Function Generator
The ATF20B+ is a bench DDS function generator for electronics testing, waveform simulation, repair work, and circuit debugging. It gives you two independent output channels in one instrument: Channel A supports sine output up to 20MHz with 100MSa/s sampling, while Channel B provides a second output for lower-frequency waveforms, phase setup, burst work, and modulation tests.
For buyers comparing a 20MHz signal generator, DDS function generator, or arbitrary waveform generator, this model is best suited to bench work that needs adjustable sine, square, ramp, pulse, noise, and arbitrary waveforms with fine frequency setting rather than a single fixed signal source.
Key Features
- Direct Digital Synthesis (DDS) design with two independent output channels.
- Channel A sine output up to 20MHz with 100MSa/s sample rate, 1024-point waveform length, and 8-bit vertical resolution.
- Channel B supports 32 standard waveforms plus 8 arbitrary waveform groups, with 12.5MSa/s sample rate and 1024-point waveform length.
- 1µHz frequency resolution across the stated ranges for precise frequency adjustment.
- 32 built-in waveform types, including sine, square, triangle/ramp, pulse, noise, and arbitrary waveform options.
- FM, FSK, ASK, and PSK modulation functions for signal behavior testing.
- Frequency sweep, amplitude sweep, and burst output functions for dynamic signal checks.
- Counter functions measure frequency, period, RMS amplitude, or peak-to-peak amplitude.
- TTL output supports TTL/CMOS compatible signal work.
- RS232 interface, 3.5-inch TFT LCD display, numeric keypad, direction keys, and rotary knob for bench operation.
- Protection functions include over-voltage, over-current, output short-circuit, and reverse-voltage protection.
- Rear voltage selector supports AC110V or AC220V input; choose the correct setting before powering the instrument.
Verified Specifications
| Model |
ATF20B+ |
| Output Channels |
Channel A and Channel B, independent outputs |
| Channel A Waveforms |
32 waveform types such as sine, square, triangle, pulse, plus 8 arbitrary waveform groups |
| Channel A Sample Rate |
100MSa/s |
| Channel A Waveform Length |
1024 points |
| Channel A Vertical Resolution |
8 bits |
| Channel A Frequency Range |
1µHz to maximum sine frequency; 1µHz to 5MHz for square wave; 1µHz to 1MHz for other waveforms |
| Channel A Frequency Accuracy |
±(5×10-5) |
| Channel A Amplitude |
2mVpp to 20Vpp from 1µHz to 10MHz; 2mVpp to 15Vpp from 10MHz to 15MHz; 2mVpp to 8Vpp from 15MHz to 20MHz, high impedance |
| Channel A Output Impedance |
50 ohm |
| Channel A Offset Range |
±10V, high impedance, attenuation 0dB |
| Sweep Functions |
Frequency sweep or amplitude sweep, 10ms to 900s, up/down/up-down/single modes |
| Modulation Functions |
FM, FSK, ASK, PSK; PSK hop phase 0° to 360° with 1° maximum resolution |
| Burst Functions |
1 to 65000 cycles, internal/external/single modes |
| Channel B Waveforms |
32 waveform types plus 8 arbitrary waveform groups |
| Channel B Sample Rate |
12.5MSa/s |
| Channel B Frequency Range |
1µHz to 1MHz for sine; 1µHz to 100kHz for other waveforms |
| Channel B Amplitude |
50mVpp to 20Vpp, high impedance |
| TTL Output |
Square wave rise/fall time ≤20ns; 10mHz to 1MHz; TTL/CMOS compatible, low level <0.3V, high level >4V |
| Display |
3.5-inch TFT LCD |
| Interface |
RS232 |
| Power Input |
AC110V or AC220V via rear voltage selection switch, 50Hz, power consumption <45VA |
| Operating Conditions |
0°C to 40°C, relative humidity <80% |
| Plug Option |
US or EU plug option |
| Item Size |
24 x 11 x 37.5cm |
| Item Weight |
3.63kg |
| Package Size |
40 x 29 x 18cm |
| Package Weight |
4.68kg |
Typical Bench Uses
- Creating repeatable sine, square, ramp, pulse, noise, or arbitrary waveforms for electronics bench testing.
- Checking how a circuit responds to frequency changes, amplitude changes, burst output, and modulation behavior.
- Using two channels when a test setup needs related waveforms, a modulation source, or separate signal outputs.
- Measuring external signal frequency, period, RMS amplitude, or peak-to-peak amplitude with the counter function.
Package Includes
- 1 x Function generator
- 1 x Q9 testing cable
- 1 x Q9 BNC-clips test lead
- 1 x RS232 cable
- 1 x Power line
- 1 x CD
Selection Notes
- Use this product when you need a 20MHz dual-channel DDS function generator with sweep, burst, modulation, arbitrary waveform, TTL output, and RS232 functions.
- Channel A and Channel B do not have identical output limits. Channel A is the 20MHz, 100MSa/s channel; Channel B has a lower frequency and sample-rate range.
- Before use, confirm the rear AC110V/AC220V selector and the plug option match your local power supply.
FAQ
Is the ATF20B+ a dual-channel signal generator?
Yes. The instrument has Channel A and Channel B outputs, and the product data describes them as independent output channels.
What is the maximum output frequency?
Channel A supports sine output up to 20MHz. Square wave and other waveform types have lower maximum frequency ranges, so choose the waveform according to the required test signal.
Does it support arbitrary waveforms?
Yes. The product data lists 32 standard waveform types plus 8 arbitrary waveform groups.
Does it include modulation and sweep functions?
Yes. It supports FM, FSK, ASK, PSK, frequency sweep, amplitude sweep, and burst functions.
Can it connect through RS232?
Yes. The product specification and package list include RS232 interface/cable information.
