Best Arbitrary Waveform Generators for Testing

Best Arbitrary Waveform Generators for Testing in 2026: Quick Answer

For most bench work, the Siglent SDG2042X (40 MHz, 1.2 GSa/s, 16-bit) is the best arbitrary waveform generator for testing under roughly $500, the Rigol DG4162 suits mid-range labs needing higher bandwidth and better jitter specs, and engineers validating high-speed serial or RF chains should look at the Keysight 33622A or Tektronix AWG5200-class instruments. The right pick depends on the highest frequency you need to reproduce, the dynamic range of your DUT, and how tightly your channels must stay phase-locked.

The Specs That Actually Matter

AWG datasheets bury the numbers that decide whether the instrument fits your work. Here’s what each one means in practice:

• Bandwidth vs. sample rate: Sample rate must be at least 2–2.5× the bandwidth to avoid reconstruction artifacts. A 100 MHz AWG needs ~250–300 MSa/s minimum; most modern units overshoot this comfortably.
• Vertical resolution: 14-bit is standard; 16-bit matters when you’re testing sensitive analog front ends or generating low-distortion sine waves for ADC characterization. Each extra bit roughly halves quantization noise.
• Memory depth: Deeper arb memory (8–16 Mpts or more) lets you replay long, non-repetitive sequences — critical for simulating real-world transients or protocol-like bursts.
• Channel synchronization: Dual-channel units vary widely. Look for independent frequency/phase control and skew under ~10 ps if you’re driving differential pairs or I/Q signals.
• Modulation: AM/FM/PM, FSK, sweep, and burst are table stakes. IQ modulation and sequence/segment mode separate mid-range instruments from budget ones.
• Output accuracy: Check amplitude flatness across the band (±0.1–0.3 dB typical) and harmonic distortion (<−60 dBc is good for a general-purpose unit).

Top Picks Compared

Prices are general market ranges; they shift with options, region, and whether you buy refurbished.

Best Budget Pick: FeelTech FY6900 Series

For hobbyists, students, or audio-band testing, the FY6900 delivers dual independent channels, decent sine purity below 20 MHz, and a usable front panel for a fraction of the price of anything else here. The catches: tiny arb memory limits complex waveforms, phase noise is noticeably worse than mid-tier units, and channel skew isn’t tightly controlled. Fine for stimulus-response work; not for precision phase-sensitive tests.

Best Value: Siglent SDG2042X

The SDG2000X line punches above its class: 16-bit vertical resolution (rare under $1,000), 1.2 GSa/s, and clean −60 dBc-class harmonics. Its EasyWave companion software handles waveform editing, and USB/LAN control works well with Python via SCPI. The 40 MHz bandwidth is the ceiling — if you need faster edge rates (rise time is ~8 ns), step up.

Best Mid-Range: Rigol DG4162

At 160 MHz with 16 Mpts of memory, the DG4000 series handles pulse generation, frequency-agile sweeps, and harmonic generation for power electronics testing. Its SiFi point-by-point architecture avoids the aliasing artifacts some DDS-based generators show at fractional frequencies. Software (Ultra Station) is functional but dated; script it instead.

Best for High-Speed Work: Keysight 33622A / Tektronix AFG31252

Above ~120 MHz, you’re paying for jitter performance, calibrated flatness, and real sequence engines. The Keysight Trueform series offers sub-picosecond jitter (as low as 1 ps RMS for standard waveforms) and dual channels that can be summed or phase-locked. The Tektronix AFG31000 line adds 9-inch touch UI, InstaView impedance matching (compensating for real load impedances, not assuming 50 Ω), and huge memory for long test vectors. These are the instruments for SerDes stress testing, radar chirps, and multi-tone IMD work.

Decision Matrix: Match Your Situation

Worked Example: Do You Have Enough Sample Rate?

Say you’re testing an amplifier flat to 50 MHz and want to inject a sine sweep plus a square wave for transient response. The sine at 50 MHz is easy — even the 1.2 GSa/s Siglent gives 24 points per cycle. But a 50 MHz square wave has meaningful harmonic content past 250 MHz (the 5th harmonic). No AWG under 250 MHz bandwidth reproduces it faithfully; you’d see ~3.5 ns rise time minimum regardless of settings. Rule of thumb: required bandwidth ≈ 0.35 ÷ desired rise time. Need 1 ns edges? You need ~350 MHz of generator bandwidth — that’s Tektronix/Keysight territory, and no firmware setting changes physics.

Software and Remote Control: Don’t Skip This

Front panels get painful fast when building multi-segment waveforms. Evaluate:

• Vendor editors: Keysight BenchVue, Tektronix ArbExpress, Siglent EasyWave — all let you draw or import CSV waveforms. Quality varies; Tektronix’s and Keysight’s are the most polished.
• SCPI over LAN/USB: All units here support it. For automated test, confirm the SCPI command set covers sequence triggering — some budget units only expose basic functions remotely.
• MATLAB/Python import: If you generate waveforms numerically, check the arb file format. Siglent and Rigol accept CSV; Keysight uses its own format plus CSV import.

Ownership Realities

• Output relays wear first — if your test toggles outputs thousands of times daily, relay life becomes a service issue on cheaper units.
• Calibration drift: Amplitude accuracy drifts ~0.5–1% per year; budget annual cal or verify against a known DMM/scope.
• Common mistake: Output levels are specified into 50 Ω. Driving a high-impedance scope input doubles your displayed amplitude — and confuses a lot of first-time users. Terminate properly or set the generator’s load impedance parameter.
• Fan noise: Mid-tier units with deep memory run warm; check noise specs if it sits next to a sensitive DUT.

FAQ

Is a function generator the same as an AWG?

No. A function generator produces fixed shapes (sine, square, triangle). An AWG also plays back user-defined waveforms from memory — arbitrary signals, captured data, modulated bursts. Most modern instruments are hybrid “function/arbitrary” generators, but verify arb memory depth before assuming.

How much bandwidth do I need for digital testing?

Use rise time, not clock rate: bandwidth ≈ 0.35 ÷ rise time. A 10 ns edge needs only 35 MHz; a 1 ns edge needs 350 MHz.

Do I need 16-bit resolution?

Only if your DUT is sensitive — ADC testing, low-level analog stimulus, or precision DC offsets. For digital stimulus and general troubleshooting, 14-bit is plenty.