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| Rigol DG1062Z vs DG4062 |
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| Sp4:
Hi All I am looking for an Arbitrary Waveform Generator and Rigol looks like a reasonable value for money. Never worked with them close before, only simple sine wave sources. The primary intended application - HF (ham radio) and Audio experiments. The price tags are quite close, screen on DG4000 is much better and I see it as a bonus. Output Frequency wise they look identical and what confuses me - Arbitrary Waveform Length: 8Mpts vs 16kpts. How a higher model can have smaller count? Do they use different algorithm? Would I be able to digitize a voice/sound block good enough to run through an experimental setup (for audio projects)? What is the general opinion around DG1000Z vs DG4000 for the same frequency? Thanks a lot. |
| H.O:
I'm sure other will chime in with more technical details but if digitizing and replaying voice is the main purpose I'd guess the 1062Z is the more suitable one due to the much longer waveform length. At 44.1kHz the DG4062 would only give you 375ms worth of audio while the DG1062Z would give you like 3 minutes.... With that said the 4062 series offers higher sample rate (500 vs 200MSa/s) and twice the output amplitude at (5Vpp vs 2.5Vpp into 50ohm) at 60MHz. It also more types of modulation. One limitation in the 4000 series that has bitten me (I've got a 4162) is that you can't change the dutycycle of the square or pulse output without ending up with "gaps" in the output. I don't know if the 1000Z series is the same. |
| Sp4:
Thank you for you input, H.O you are right, 375ms does not look great :( Frequency sweep in audio band will help somehow and I have a feeling that bigger collection of modern modulations in conjunction with greater sample rate may be a serious argument. Thanks again. I hope to hear more opinions. |
| Sp4:
After looking into Pros and Cons ended up buying DG4102 :) for relatively small difference in $$$ between DG4062 and DG4102. It does all I need at this moment without hacking. Vendor gave me quite interesting note saying that firmware specs upgrade voids my warranty. Never planned though ;) . Cheers, |
| TMM:
--- Quote from: H.O on November 02, 2017, 06:31:23 pm ---One limitation in the 4000 series that has bitten me (I've got a 4162) is that you can't change the dutycycle of the square or pulse output without ending up with "gaps" in the output. I don't know if the 1000Z series is the same. --- End quote --- Not quite sure what you mean by 'gaps', but the DG4000 series enforces a minimum pulse width and rise/fall time based on the frequency of the waveform. I guess this is because of the limited amount of sample memory available, or limited processing power to generate samples on the fly. For example, a 1kHz pulse limits the minimum pulse width to 3.125us. There is a work around if you need shorter pulses - simply set the frequency to an arbitrarily high value, enabling a very short pulse width, then enable a 1 cycle burst and use the burst period to achieve the desired frequency. E.g. Configure a 10MHz, 8ns pulse, enable Burst at 1cycles, 1ms period - now you have a 1kHz pulse waveform with an 8ns width. Achieving finer resolution of the duty cycle for a square wave can be achieved the same way by manipulating the frequency of the square wave and using the burst period to set the actual frequency. Another limitation I've found with my DG4062 is that the external modulation inputs seem to be digitally sampled at about 8bit so the dynamic range isn't that great. A Tek AFG3000 seemed to work as if it were analogue in the same application (phase modulating a 1-10kHz sine wave) |
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