Siglent SDG1032X Function Generator

This time the user instructions do match up with the actual device, thank goodness. Once again the fan noise is definitely audible, even if not nearly as intrusive as on the PeakTech. In price terms, at around €450 / £420 / $540, this generator is in the same ballpark.

Sine-wave signals are generated up to 30 MHz with a sample rate of 150 MHz, which results in a ratio of 20 %. Here again the maximum amplitude is 20 Vpp up to 10 MHz and 10 Vpp above this — both measured into Hi-Z. A remarkable setting option, which I had not observed previously, is the ‘Harmonic’ function. If you enable this you can add defined harmonic components with adjustable amplitude and phase to a sinewave signal. This not only lets you check how you can avert defined harmonics in circuits but also even eliminate a harmonic produced in an amplifier by adding a signal of equal amplitude with 180° phase.

For squarewave signals you have virtually no restrictions. Even at 30 MHz you can still adjust the duty cycle in the range 41 to 59%. At lower frequencies the adjustment range of the duty cycle is extended significantly.
Rise and fall times of 4.2 ns are indicated.

When it comes to pulses, if you select the ‘Pulse’ curve shape you can even preset the rise and fall times — an extraordinarily useful feature. Compared to the square-wave function, the minimum times are slightly increased by 16.8 ns. Using ‘Delay’ you can shift the signal of the second channel in a relative manner, similar to adjusting the phase of the sine-wave signal.

Ramps up to 500 kHz are possible.

Using the DC function you can generate an adjustable DC voltage in the range of ±10 V.

On the rear panel of the case there is a Sync output that you can enable in the Sync menu and link this with one of the channels. However, in comparison with the signal channel this displays jitter at higher frequencies and is therefore of limited use. On the data sheet [3] its maximum frequency is given as 1 MHz, although the function continues to work up to 10 MHz.

On this Siglent device both channels appear to work identically — at least I could not detect any restrictions. You can even add the signals from the two channels.

Regarding modulation, the maximum internal modulation frequency is 20 kHz, as against 50 kHz for the external input.

The reference output provides a square-wave signal (filtered by an R-C low-pass) of 10 MHz at an amplitude of 1.5 VPP into 50 Ω.

Differential signals can be generated very simply. Next to the Copy command there is a Tracking Menu, in which you can set the parameters to be equiplinked, even by using an offset value.

pic1 3 Siglent SDG1032X Function Generator

10. June 2019 by sam
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