Signal Generator for SainSmart DDS-140

brand: SainSmart 1 SKU: 20-010-732 Variants ID: 45100800724

DDS-140 is a medium-performance oscilloscope. The highlighting advantages are the optional modular structure and high performance price ratio. When you do not want to spend a high price to buy a traditional oscilloscope, a signal generator and a logic analyzer .This product will be a good choice.

$9.50 $24.99 Save $15.49
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Waveform Type

Square wave, sine wave, triangle wave, PWM

Output amplitude

Software adjustable output range-4V ~ +4 V

Output frequency

1 ~ 20M HZ (sine wave) continuously adjustable, PWM output frequency limit 20K HZ

Output bandwidth

5M HZ (Sine wave)

Output Bias

Software adjustable


Software adjustable PWM output duty cycle, 10% of the ladder


10 cm X4 cm X2.5 cm

Customer Reviews

3 Based on 1 reviews
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Useless: poor user interface, amplitude varies wildly, frequency stablity poor

The signal generator can generate decent waveforms at low frequencies but depending on the waveform, falls apart above 1MHz (sometimes not even that high). Frequency accuracy is marginal, frequency stability is poor. PWM mode has massive jitter problem. Sine wave: Above 10MHz it stops looking even remotely like a sine wave; adequate to around 5MHz then it depends how bad a wave you can tolerate. PWM mode is limited to 20kHz. Square and triangle waves are OK to around 1MHz then starts to deteriorate badly. Amplitude and offset can be set but only via a graphical slider which has no markings so you have no idea what you are setting them to. Amplitude changes greatly by itself as you change the frequency. The software is straight-forward, but very annoying to use; to change any setting you must stop the signal being generated and click on-screen buttons to change the waveform or frequency (you can't enter the frequency using the keyboard which is just crazy). This is surprising and disappointing because the oscilloscope user interface is pretty good. There may be some cases where this is useful for applications below 1MHz, and I realize it is very inexpensive, but with such poor user interface, bad frequency stability, and useless control over amplitude, it fails in just about everything a signal generator needs to do. This is a toy (and not a fun one), not a tool for your bench.